3 kv, 6 kv, 10 kv 315 kw-8000 kw aesmv medium voltage ...market.drivemotor.biz/doc/aesmv medium...

Advanced Electric Systems LLC

3 KV, 6 kV, 10 kV

315 kW-8000 kW

AESMV Medium Voltage Frequency Inverter

User Manual

AESMV Medium Voltage Drive User ’s Manual

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Table of Contents

1. Overview ....................................................................................................................................... 3

1.1 Features of Drives .................................................................................................................... 3

1.2 Technical Training for Users ................................................................................................... 6

1.3 Model Description .................................................................................................................... 6

1.4 Equipment Composition.......................................................................................................... 7

1.4.1 Transformer Cabinet ................................................................................................................ 8

1.4.2 Control/Unit Cabinet ...............................................................................................................10

1.4.3 Power Unit .............................................................................................................................13

1.5 Technical Parameters ............................................................................................................ 14

1.6 Presale and Aftersales Description...................................................................................... 16

1.6.1 Project Management...............................................................................................................16

1.6.2 Engineering Design ................................................................................................................16

1.6.3 On-site Service ......................................................................................................................16

16.4 Aftersales Service....................................................................................................................16

2. Principles ....................................................................................................................................17

2.1 Main Circuit ............................................................................................................................. 17

2.2 Power Unit ............................................................................................................................... 20

2.3 Control System ....................................................................................................................... 21

3. User Interface ............................................................................................................................22

3.1 Main Monitoring Interface ..................................................................................................... 23

3.2 Function Setting ..................................................................................................................... 26

3.2.1 Control State ..........................................................................................................................27

3.2.2 Operation Mode .....................................................................................................................27

3.2.3 Parameter Setting ..................................................................................................................28

3.2.4 Host Control ...........................................................................................................................28

3.2.5 Host Parameter Setting...........................................................................................................28

3.2.6 Presetting Mode .....................................................................................................................28

3.2.7 System Bypass ......................................................................................................................29

3.2.8 Main Interface Locking............................................................................................................30

3.2.9 Primary Password and Advanced Password.............................................................................30

3.3 Parameter Setting................................................................................................................... 30

3.3.1 Drive and Motor Parameters ...................................................................................................31

3.3.2 PID Adjustment Parameters ....................................................................................................36

3.3.3 Analog Input Parameters.........................................................................................................39

3.3.4 Host Communication/Multi-level Setting ...................................................................................40

3.4 Operation Logs ....................................................................................................................... 41

3.5 Fault Information .................................................................................................................... 43

3.6 Exit ........................................................................................................................................... 44

3.7 Software Keypad .................................................................................................................... 44

4. Installation ..................................................................................................................................45

4.1 Installation and Storage Environments ............................................................................... 45

4.2 Installation Space ................................................................................................................... 46


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4.3 Installing the Cabinet ............................................................................................................. 47

5 Wiring ............................................................................................................................................48

5.1 Main Circuit Wiring................................................................................................................. 48

5.2 Layout of Main Loop Terminal .............................................................................................. 50

5.3 Wiring Terminal of Control Power Supply ........................................................................... 50

5.4 Wiring of Control Loop .......................................................................................................... 51

5.4.1 Description on Layout of Wiring Terminal of Control Loop ..........................................................51

5.4.2 Description on Functions of Control Loop Terminal ...................................................................52

5.4.3 Standard Wiring .....................................................................................................................54

5.4.4 Wiring Precautions .................................................................................................................55

6. Operation ....................................................................................................................................55

6.1 User Interface Control ........................................................................................................... 55

6.2 Cabinet Door Control ............................................................................................................. 56

6.2.1 Medium Voltage Breaker .........................................................................................................56

6.2.2 System Reset.........................................................................................................................57

6.2.3 Main Frequency Shift ..............................................................................................................57

6.2.4 Selection of Remote/Local Control ...........................................................................................58

6.3 Remote Control ...................................................................................................................... 59

6.4 Host Control ............................................................................................................................ 59

7. Operation ....................................................................................................................................59

7.1 Inspection Before Operation................................................................................................. 60

7.2 Supplying Control Power ...................................................................................................... 60

7.3 Supplying Medium Voltage Power ....................................................................................... 61

7.4 Trial Run Without Motor ........................................................................................................ 61

7.5 Trial Run with Motor ............................................................................................................... 61

7.6 Operation Procedure.............................................................................................................. 62

8. Troubleshooting and Maintenance ......................................................................................63

8.1 Categories and Minor Faults and Alarms ............................................................................ 63

8.2 Categories of Major Faults and Alarms ............................................................................... 63

8.3 Troubleshooting ..................................................................................................................... 64

8.4 Replacing Power Unit ............................................................................................................ 65

8.5 Maintenance ............................................................................................................................ 66


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1. Overview

1.1 Features of Drives

The AESMV medium voltage variable speed drive series are medium voltage AC motor speed drives. The

AESMV medium voltage drive series input medium voltage directly and output inverted medium voltage

directly. Based on the cutting-edge power unit serial wave overlay technology, this product eliminates the

majority of harmonic current and implements perfect harmonic-free output waveforms. The input and output

waveforms strictly comply with the requirements on the harmonic content specified in IEEE Std 519-1992 and

GB/T14549-2002 “Quality of Electric Energy Supply, Harmonics in Public Supply Network”. Without installing

any input & output filters, the drive prevents the power supply network and the surrounding electric devices

from interference of harmonics. The input power factor of the drive remains over 0.97 within the whole load

fluctuation range, and the general efficiency is of the drive is over 96%.

1) The main components of the drive such as power switch component and filter capacitor are supplied by

internationally well-known manufacturers.

2) Air cooling is designed inside the cabinet of the drive. Thanks to sufficient consideration of the heating of

the components and reasonable design of the heat dissipation distance and the air -cooling channel, the

driver provides a cooling capability which ensures long stable operation under various loads in a 0~40°C

environment, and controls the temperature rise within the cabinet not to exceed 30°k.

For inferior operation environments, the drive can provide the cooling mode of water-cooled, air-closed

circulation as required by the user.

3) The drive works normally under a humidity less than 90% (20°C). A low-temperature condensate heating

unit is set inside the drive cabinet.

4) The drive works normally in case the input voltage fluctuates by ±15%, and ensures the unit to work

normally when the input voltage fails for a transient interval of 100ms, and the rotation speed tracking

startup will be implemented upon recovery of power-on.

5) The drive works normally when the input power supply frequency fluctuates within 50Hz±3%.

6) The drive cabinet contains two lines of control system AC power supplies, and can contain UPS as

required, in order to continue the normal operation in case of power failure and ensure com plete

shutdown of the unit.

7) The drive cabinet contains dustproof and rodent-proof units of the air-cooling system, and undergoes the

electrostatic plastic spraying treatment on the surface.

8) In order to ensure normal safe operation of the drive, the drive can bypass the faulty power unit

automatically upon failure of the power unit. When the fault is eliminated, the system will exit the power

unit bypass mode automatically. The faulty power unit is easily replaceable.

9) The output frequency of the drive is 0~60 Hz. The user can set and lock the minimum and maximum

output frequencies according to the actual operation requirements to prevent the load from being greater

than the out-of-sync torque, and prevent overspeed of motor.


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10) Overload capability and protection of the drive: The general model and the heavy-load model of the drive

can operate continuously for a long period under an overload of less than 110%. Under an overload of

120%, the general model will operate for 1 minute and then stop for purpose of protection. Under an

overload of 150%, the general model will stop immediately for purpose of protection. Under an overload

of 150%, the heavy-load model will operate for 1 minute and then stop for purpose of protection. Under

an overload of 200%, the heavy-load model will stop immediately for purpose of protection.

11) The drive cabinet undergoes electromagnetic shielding treatment and meets the EMC requirements. The

operation noise of the drive is less than 75dB (A). The IO cable can be ordinary power cable, and t he

output cable length is up to 500m.

12) The Total Harmonic Distortion (THD) of the output voltage and current waveforms is less than 4%.

Without applying any filter, the drive complies with IEEE Std 519-1992 and GB/T14549-2002. For details,

see the relevant test report.

13) The internal communication signal cable inside the drive is optical cable for purpose of isolating voltage

and preventing interference.

14) The input of the 6kV/10kV model adopts the 6×6/6×9 pulse rectification mode, which basically eliminates

the impact of the input harmonics on the supply network. The PWM mode of spatial voltage vector

control is adopted. The dynamic rotation speed control precision is less than ±4% of the rated rotation

speed, the torque step response time is less than 10mS, and the output frequency resolution is less than

0.1 Hz.

15) The Mean Time Between Failure (MTBF) of the drive is greater than 5,000 hours. The MTBF of the

air-cooling system is greater than that of the drive. The fan power supply derives from the isolation

transformer.

16) Control function: The control software of the drive adopts standardized designs and is easily configurable.

The control system adopts embedded integrated man-machine interfaces, embedded operating system

and full-Chinese interface. The drive communicates with the host or the control system, and adopts the

RS485 interface and the Modbus protocol.

16.1 Control mode: The AESMV medium voltage drive series adopt two control modes: Local control

and remote control. In the local control mode, the operation, shutdown, reset and frequency rise/fall

of the drive are performed on the operation panel of the drive body. Remote control is a type of

control performed through the system DCS or other remote control stations.

16.2 Frequency presetting mode: The AESMV medium voltage drive series adopt three frequency

presetting modes: (1) Manual frequency presetting on control panel; (2) analog input frequency

presetting; (3) terminal frequency presetting. Frequency presetting provides the auto holding

function. Namely, when the drive switches from the analog presetting mode or the terminal

frequency presetting mode to the manual presetting on control interface, the preset frequency will

retain the set value existent before the switchover automatically, and then change to the curr ent

preset frequency gradually.

16.3 Frequency hop setting: The AESMV medium voltage drive series can have three resonant

frequency hop points, which avoid the mechanical resonant frequency of the electromechanical

system and protect the safe and reliable operation of the drive system effectively.


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16.4 Low-frequency torque boosting: In order to make up the shortfall of torque at the time of motor

starting and low speed, the torque boost voltage should be applied as required to change the input

V/F curve of the drive, and boost the output torque of the motor.

16.5 Restart after transient power failure: When the power system fails transiently or becomes

undervoltage transiently, the rotation speed of the motor will decrease. The drive can track the

rotation speed of the motor automatically. After the power supply (voltage) is recovered, the output

frequency of the drive adapts to the rotation speed of the motor automatically. As a result, the

motor in free run accelerates smoothly to restart, and returns to normal run state existent before

the system power failure. This fulfills the production process requirements, improves the work

efficiency and avoids accidents of stopping production.

16.6 Power unit bypass: The power unit bypass function means the system does not stop when the

power unit of the drive fails. The drive diagnoses the fault, and bypasses the faulty power unit if this

is allowed, and then the drive decelerates the operation, which improves the reliability of the drive

system significantly and reduces the system stop.

16.7 Bidirectional switching between the drive and the mains frequency supply network: An automatic

bypass cabinet is configured for the system. The bidirectional switching between the drive and the

mains frequency supply network occurs automatically, without any manual handling. This improves

the reliability of the system operation significantly, meets the requirements of the high-reliability

users (e.g., power plant), and prevents the equipment or process of such users from being affected

by fault of the drive.

16.8 Fault diagnosis and handling: The AESMV medium voltage drive provides perfect fault diagnosis,

locating and handling functions. The faults in the system are categorized and prioritized before

handling. The drive outputs the fault type and contents in real time, and stores the history fault

records.

16.9 Friendly user interfaces: The AESMV medium voltage drive adopts Windows XP operating plat form

solely in Chinese, 12-inch high-fidelity LCD monitor, and touch screen, which are more suitable for

the operation habits of the users.

a) Full-Chinese text and graphic, easy to learn and easy to use.

b) Large screen display. The user can set one or more groups of parameter simultaneously.

Without dull parameter codes, the user can set the parameters accurately, visually and

conveniently.

c) The operation parameters are displayed on the same screen explicitly.

d) State display

e) Touch screen operation locking

f) The drive records the operation parameters at the set time, records every operation of the

drive, and prints out the record forms.

g) The drive can display two lines of real-time waveforms of IO voltage or current.

h) The drive can record store more than 100 history faults.

i) In closed loop operation, the PID parameter can be adjusted online.


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1.2 Technical Training for Users

The whole training plan is divided into two parts:

1 Training at manufacturer’s domicile: The buyer dispatches 3~4 trainees to the domicile of the

manufacturer for training, which lasts for 7~10 days. The training contents are:

1) Fundamentals of medium voltage drive;

2) Structure, installation and maintenance of medium voltage drive.

3) Operation practice of medium voltage drive.

The bid inviter shall undertake the travel and accommodation expenses of the trainees dispatched by the

bid inviter. The bidder shall undertake the salary to the trainers, the expenses of teaching materials,

drawings and manuals, and the expenses of observing the factory and training utilities.

2 On-site training

The bidder dispatches technicians to the equipment site to train the operation & maintenance st aff of the

buyer at a proper time during the commissioning period. The training contents and requirements are the

same as those of training at the manufacturer’s domicile.

1.3 Model Description

AES MV - A - 600 - Т060

Brand name

Voltage grade:

MV- medium voltage

Type of motor:

A- asynchronous;

Rate current:

600 A

Rate Voltage:

T030- 3 kV

T060- 6 kV

T100- 10 kV

For example, AESMV-A-600-Т060 means a drive whose voltage grade is 6kV, and whose rated output current

is 600A (capacity 6250kVA).


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1.4 Equipment Composition

The appearance of a typical AESMV drive is shown in the following figure. A typical drive consists of:

Transformer cabinet, control cabinet and unit cabinet.

Appearance of a typical drive

A centrifugal fan is installed on the top of both t ransformer cabinet and unit cabinet for purpose of dissipating

the heat generated in the cabinet. Through the cabinet-side column, the cabinets are interconnected by

screws.

German EBM cooling fan


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1.4.1 Transformer Cabinet

6kV transformer

Hoisting hole of transformer

Cooling fans, 6 fans in

the front and 6 fans at

the back

Secondary side winding wiring terminal of transformer,

connected to 3-phase input cable of the unit. Labels are

marked beside the wiring terminal and on the cable.

Subscriber lead-in power wiring terminal

10kV transformer

Hoisting hole of transformer

Cooling fans, 6 fans

in the front and 6

fans at the back

Subscriber lead-in power wiring terminal

Secondary side winding wiring

terminal of transformer (4 windings

per phase in the front), connected

to 3-phase input cable of the unit.

Labels are marked beside the

wiring terminal and on the cable.

Secondary side winding wiring terminal of

transformer (5 windings per phase at the

back), connected to 3-phase input cable

of the unit. Labels are marked beside the

wiring terminal and on the cable.

Front view and back view of transformer

A phase-shift transformer is installed in the transformer cabinet for providing 3 -phase power supply to the

power unit. The phase-shift transformer is in a dry-type structure and adopts H-level insulation. A cooling fan


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is installed on the top of the cabinet. A dry -type transformer temperature control instrument is installed on the

cabinet door to provide temperature alarm and overheat protection for the transformer. The default set values

are 130°C and 150°C respectively. A position switch is installed inside the cabinet door, and raises an alarm

when the cabinet door is opened.

The transformer and the pedestal are connected into a whol e through screws for ease of transport and

installation. The lifting eye of the cabinet is used for hoisting the transformer cabinet only, and cannot be used

for hoisting the whole body which contains the transformer. The whole body needs to be hoisted through the

fork lift hole, or the hoisting hole of the transformer (as shown in the above figure).

For the 3kV and 6kV drives, the secondary winding wiring area is on the right side in the front of the

transformer, and is connected to the 3-phase input cable of the power unit. For the large-capacity model of the

10 kV drive, the secondary winding wiring area is on the right side in the front and on the left side in the back

of the transformer, and is connected to the 3-phase input cable of the power unit. The wiring bar shall

correspond to the cable label exactly. The 3-phase input and output of the drive leads from the bottom

(through the trench) to the back of the transformer. The input power cable is laid on the upper part and enters

the transformer directly, which is not sensitive to phase sequence. The output power cable is laid on the lower

part, and is led from the power unit for providing variable-frequency power supply to the motor, where the line

sequence relationship should be adjusted according to the rotation direction of the motor. After the input and

output medium voltage cables are connected, the cables must be fixed onto the transformer or the cabinet.

A centrifugal fan is installed on the top of the transformer cabinet top (no centrifugal fan is installed for the

model of lower than 1000kVA). Six cooling fans are installed at the bottom of the transformer. One cooling fan

is installed on the front and the back of each iron core.


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1.4.2 Control/Unit Cabinet

Layout of units in 6kV cabinet

The power units installed in the 6kV cabinet are divided into three groups: A-phase, B-phase and C-phase

units. The units of each phase are arranged from right to left, and consist of 5 -6 units. For example, there are

5 A-phase units which are A1, A2, A3, A4 and A5 from right to left. A 3-phase isolation power supply is output

from the lower side of the unit through the secondary side of the fast splicing transformer. The rated voltage is

690V. A single-phase power supply is output from the upper side of the unit. The five units of each group are

connected through copper bar into one phase in series. The first unit of each phase is short -circuited, and

makes up a 3-phase Y connection. The fi fth unit output of each phase is connected with the output wiring

terminal of the drive, which makes up a 3-phase output of the drive with a rated voltage of 6kV.

The power unit is installed on the guide rail, and fixed onto the guide rail through two M8 screws. An air duct is

set at the back of the unit cabinet. The cool air flows through the filter layer of the front cabinet door and the

unit radiator. The heat generated inside the power unit is carried to the air duct at the back, and expelled out

of the unit cabinet through the centrifugal fan at the cabinet top.

A filter layer is installed outside the cabinet door for purpose of preventing the dust particles from getting into

the unit. A position switch is installed inside the cabinet door for purpose of interlocking the cabinet doors, and

raises an alarm when the cabinet door is opened.


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Each phase of the 10kV drive has 9 power serial units. These units are also arranged from right to left. For

example, the A-phase power units are A1, A2, A3, A4, A5, A6, A7, A8 and A9 from right to left. The 9 units of

the same phase are connected in series through a copper bar. The first unit of the three phases is

short-circuited into a Y-shape central point, and the ninth unit of the three phases is the 3-phase medium

voltage output of the drive. The rated voltage of the power unit is 660V, and the rated input/output voltage of

the drive is 10kV.

The power unit is installed on the guide rail, and fixed onto the guide rail through two M8 screws. The air duct

is located in the middle of the cabinet body.

The cool air flows through the filter layer of the front/back cabinet door and the unit radiator. The heat

generated inside the power unit is carried to the air duct in the middle, and expelled out of the unit cabinet

through the centrifugal fan at the cabinet top.

A filter is installed outside the cabinet door for purpose of preventing the dust particles from getting into the

unit. A position switch is installed inside the cabinet door for purpose of interlocking the cabinet door, and

raises an alarm when the cabinet door is opened.

Front view of control/unit cabinet

The operation touch screen is installed on the front right side of the cabinet body. Below the touch screen are

“Local/remote” control selection switch, “Mains frequency shift” button, “System reset” button and “Medium

Voltage breaker” self-locking button. Above the touch screen are medium voltage “Power indicator”, “Run

indicator”, and “Fault indicator”.

The control cabinet consists of main control board, signal board and power board, powered by both 220VAC

power supply and medium voltage primary power supply concurrently. This ensures that the drive can go on

working in case the 220VAC power supply fails in the process of operation. The control cabinet is connected

with the unit through fibers for purpose of communication. The power board provides a working power supply

for the controller and the PLC.

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Front view of control cabinet


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1.4.3 Power Unit

Power unit

The power unit (briefly known as “unit”) is installed in the unit cabinet, and fixed onto the guide ra il through

screws. All units in the cabinet have the same electrical and mechanical parameters and are interchangeable.

The 3-phase input of the unit is connected to the secondary output of the main transformer, and protected by

the fuse. After the single-phase output is connected in series, one end of it is short -circuited into a star point

together with other two phases, and the other end is output to the motor.

Independent control board and drive board exist in the unit. The working power supply derives from the DC

part of the main loop. Switch power supply is adopted. The control board is also used for driving the IGBT and

the silicon-controlled thyristor in the unit bypass. The control board communicates with the main control board

in the system through fibers. The fiber is a unique connection between the unit and the main control system.

This ensures complete electric isolation between the unit and the main control system.

After the screws between the unit and the guide rail, input cable, output copper bar and fiber connector are

removed, the unit is isolated from the unit cabinet completely, and can be removed off the guide rail.

The procedure of installing the unit is quite the contrary. First, put the unit onto the guide rail, push it inward

gently until it stops, tighten the screws, connect the input cable and output copper bar, and insert the fiber

connector.

After the power supply to the variable speed drive is cut off, hazardous voltage may still exist in the unit.

Therefore, remove the fiber connector to split the unit only after the LED goes out. Perform operations inside

the unit only after the capacitor has discharged electricity completely.

Radiator

Output terminal

Input terminal

Fuse

Fiber


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1.5 Technical Parameters

The AESMV medium voltage drive provides three voltage levels currently: 3kV, 6kV and 10kV. As required by the user, products of other nonstandard voltage

levels can be customized.

Specif ications AESMV_T30 077 096 120 154 192 240 290

Output

Capacity of drive (kVA) 400 500 630 800 1000 1250 1600

Power of adaptive motor (kW) 315 400 500 630 800 1000 1250

Rated output current (A) 077 096 120 154 192 240 308

Number of serial units per phase 5

Outline dimensions (W×H×D) 3700×2350×1100 4200×2450×1200 6400×2750×1300

Weight (Kg) 3500～4200 4000～6000 6000～8550

Specif ications AESMV_T60 39 48 61 77 96 120 154 173 192 220 240 304 384 480 540 600

Output

Capacity of drive (kVA) 400 500 630 800 1000 1250 1600 1800 2000 2250 2500 3150 4000 5000 5600 6250

Power of adaptive motor (kW) 315 400 500 630 800 1000 1250 1400 1600 1800 2000 2500 3150 4000 4500 5000

Rated output current (A) 39 48 61 77 96 120 154 173 192 220 240 304 384 480 540 600


Outline dimensions (W×H×D) 3350×2350×1100 3700×2350×1100 4200×2450×1200 6400×2750×1300 6500×3300×2100

Weight (Kg) 2500～2800 3050～3850 4400～4850 6500～9050 12300～14400

Specif ications AESMV_T100 23 29 36 46 58 72 92 104 115 130 144 182 230 290 323 360 433 580

Output

Capacity of drive (kVA) 400 500 630 800 1000 1250 1600 1800 2000 2250 2500 3150 4000 5000 5600 6250 7500 10000

Power of adaptive motor (kW) 315 400 500 630 800 1000 1250 1400 1600 1800 2000 2500 3150 4000 4500 5000 6000 8000

Rated output current (A) 23 29 36 46 58 72 92 104 115 130 144 182 230 290 323 360 433 580

Outline dimensions (W×H×D) 4300×2350×1100 4750×2350×1200 5600×2750×1200 8500×2750×1300 8200×3300×2100


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Weight (kg) 3000～3850 4250～5300 6150～7950 10200～12800 16000～22300


Pow er supply

Input frequency 50/60Hz+3%

Input voltage T30: 3kV，T60: 6kV, T100: 10kV(-20% ~ +15%)

Allow ed power failure time 200ms

Input pow er factor > 0.97 (under a rated load)

Eff iciency > 96% (under a rated load); > 98% for the drive part

Control

features

Control mode AC-DC-AC&DC high voltage connection mode of PWM serial phase-shift overlaid wave of sine wave

Output frequency 0 ~ 50Hz

Precision of output frequency 0.1Hz

Overload capability 120% (1 minute), 150% (2s), 160% (immediate protection); heavy-load model: 150% (1 minute), 180% (2s), 200% (immediate protection)

Acceleration and deceleration time 4 ~ 1200s

Analog input 0~5V, 0~20mA, 4~20mA (2 ports)

Analog output 0~10V, 4~20mA voltage, current and frequency optional (3 channels) output is for 5 variables

Analog feedback 0~5V, 4~20mA (2 ports)

Host communication Isolation RS485 interface

Boolean input/output 14-channel/10-channel

Protection function Overcurrent, overload, short-circuit, 3-phase current imbalance, transient power failure, input/output phase loss, overvoltage, undervoltage, body

overheat, shutdown caused by external fault, automatic bypass of power unit

Environment

Operation environment temperature 0°C ~ + 40°C

Storage and transport temperature -40℃ ~ +70℃

Cooling mode Compulsory air cooling

Environment humidity < 90% (no condensate)

Altitude < 1,000m

Protection grade IP30


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1.6 Presale and Aftersales Description

1.6.1 Project Management

After the contract is signed, we will appoint a project manager to coordinate the work throughout the project,

e.g., system design, project progress, manufacturing confirmation, programming and technical service,

drawings and documents, factory and on-site test, commissioning, and site availability test.

1.6.2 Engineering Design

1) Before manufacturing of the device and the system, we will provide the device layout, system instruction

manual, and function control and logic control drawings to the buyer for review. This ensures the

provided system and device to comply with the contract stipulations.

2) We will provide all final interface documents and drawings to the buyer to facilitate design work of the

buyer.

3) The device layout, logic control diagram, control wiring diagram and other sample diagrams provided by

us will update with the design progress to reflect the real-time design progress.

4) After the variable-speed system is commissioned on the site, we will provide the system completion

diagram which reflects the modification made during the on-site commissioning.

1.6.3 On-site Service

1) After the all devices and systems are installed, debugged and commissioned, we will dispatch experts to

the site to provide on-site service by residing on the site. During the installation, wiring, debugging and

commissioning of the devices and systems, the experts will provide supervision and guidance.

2) The experts dispatched by us will also provide on-site training for the installation and operation staff of

the buyer, teach them how to differentiate and install devices, and how to start, operate and maintain the

devices and systems.

3) We will be responsible for putting the variable-speed system into normal operation.

4) Shenzhen Winner S&T Co., Ltd. sets technical service offices in all local provinces/cities, and provides

all-weather comprehensive services to the AESMV medium voltage drive users.

16.4 Aftersales Service

Complaint handling: Answer in writing

Service response time: Less than 3 hours for users in the local city and the cities where a service center is set.

24 hours for users in the local region and the regions where a service center is set.

48 hours for users in surrounding regions.

Available throughout the year


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2. Principles

2.1 Main Circuit

The AESMV medium voltage drives adopt the AC-DC-AC&DC medium voltage (high-high) connection mode,

and the main circuit switch component is IGBT. As restricted by the IGBT voltage tolerance, it is impossible to

output 6kV or 10kV directly through inverting. Direct serial connection is impossible due to bottlenecks of high

ON/OFF frequency and difficulty of voltage equalization. The AESMV variable-speed drive adopts serial

connection of power units and overlaid wave step-up, and makes the best of the mature technologies of the

normal-voltage drive, thus providing high reliability. Figure 2.1 is a typical main circuit diagram of the 6kV

series.

The insulation t ransformer is a 3-phase dry-type

rectification transformer characterized by air

cooling, long service life, and no need of

maintenance. The primary input of the transformer

may be of any voltage, and Y connection. The

number of secondary windings depends on the

voltage grade and structure of the drive. A 3kV

transformer contains 9 windings, a 6kV transformer

contains 15(or18) windings, and a 10kV

transformer contains 27 windings. The

side-prolonging triangle connection provides

isolation 3-phase power input for each power unit.

In order to suppress the harmonic content at the

input side maximally, the secondary windings of the

same phase shifts phases through the

side-prolonging t riangle connection method. The

phase difference between windings is calculated

through the following formula:

Phase-shift angle = ————————————

A certain phase difference exists between the

secondary windings of the transformer which

provides power supply to the power unit. Therefore,

a majority of the harmonic current caused by single

power units is eliminated, The Total Harmonic

Distortion (THD) of the input current of the AESMV

transformer is far less than 5% required by the

national standard, and the input power factor

proximate to 1 can be maintained. The following

figure shows the actually recorded waveform of the

input current of the 6kV series (5 serial units per phase), which verges on a sine wave.

60°

Number of units per phase

Input current waveform

Input 3-phase AC

current (any voltage)

Unit A1

Isolation transformerPower unit

Unit A2

Unit A3

Unit A4

Unit A5

Unit B1

Unit B2

Unit B3

Unit B4

Unit B5

Unit C1

Unit C2

Unit C3

Unit C4

Unit C5

Phase shift

secondary coil

6000V

motor

Figure 2.1 Master circuit diagram of AESMV

medium voltage drive 6kV series


18

The drive output derives from serial connection and overlay of the low-voltage power units of multiple 3-phase

inputs and 1-phase outputs. For example, when five power units of rated output 690VAC are connected in

series, a 3450V phase voltage will be generated, as shown in the following table.

Configuration of power units of AESMV drive

Rated voltage

of drive

Number of

serial units per

phase (n)

Rated voltage

of unit (V)

Output

phase

voltage (V)

Number of

levels per phase

of voltage

Output line

voltage (kV)

Number of

levels of output

line voltage

T30 3 580 1740 7 3 13

T60 6 580 3480 13 6 25

T100 9 640 5760 19 10 37

6000V

line voltage

3450V

phase voltage

6kV voltage overlay diagram


19

3000V

line voltage

1740V

phase voltage

5760V

phase voltage10000V

line voltage

3kV voltage overlay diagram 10kV voltage overlay diagram

Through 3-phase output Y-connection, the variable-frequency 3-phase medium voltage power supply required

by the drive motor is obtained.

Unit 1

Unit 2

Unit 3

Unit 4

Unit 5

Output of 6kV units and phase voltage waveform diagram

The above figure shows the voltage waveforms output by each power unit and the phase voltage waveforms

output after five 690VAC power units are connected in series. The pulse between adjacent units has a time

difference equivalent to 1/5 of an ON-OFF period. After the units are connected in series and overlaid, the

phase voltage will obtain 11 different voltage levels: 5~0~-5. While the voltage level is increased, the voltage

value of each level decreases sharply, thus reducing the damage to the motor insulation caused by dv/dt and

weakening the harmonic content of the output voltage drastically. In the following figure, the left side shows

the actually recorded voltage waveforms of the Uab line output by the 6kV 6-unit drive, where the peak

voltage is 8.5kV. Due to the filtering effect of the motor inductance, the output current waveforms are better

than the voltage waveforms. In the following figure, the right side shows the actually recorded waveforms of

the output current Ia, where the peak current is 130A. The increase of voltage level improves the output

performance of the drive greatly, and the output waveform verges on a sine wave.


20

Output line voltage waveform Output current waveform

2.2 Power Unit

The principles of the power unit are shown in the following figure. R, S and T at the input power supply side

are connected to the 3-phase low-voltage output of the secondary coil of the transformer. The 3-phase diode

is rectified throughout the wave for purpose of capacitor charging at the DC step. The voltage on the capacitor

is supplied to the 1-phase H-shape bridge inverter circuit composed of IGBT.

Fast splicing Diode rectification DC step Inverter output Unit output Unit bypass (optional)

Main circuit diagram of power unit

The power unit receives signals through fibers. Through the spatial vector sine wave Pulse Width Modulation

(PWM) mode, the power unit controls the connection and disconnection of Q1~Q4 IGBTs, and outputs the

1-phase PWM waveforms. Each unit has only three possible output voltage stages. When Q1 and Q4 are

connected, the output voltage state of L1 and L2 is 1; when Q2 and Q3 are connected, the output voltage

state of L1 and L2 is -1; when Q1 and Q2 are connected, or when Q3 and Q4 are connected, the output

voltage state of L1 and L2 is 0.

The power unit provides the bypass function. When a unit cannot go on working due to fuse fault,

overheat ,overvoltage or IGBT fault, this unit and the units on the corresponding positions of the other two

phases will bypass automatically. At this time, Q1~Q4 block the output, and the silicon-controlled thyristor k is

connected to ensure continuous work of the drive, and a bypass alarm will be raised. In case of unit bypassing,

less units of the drive are operating, the rated output voltage capability will decrease. However, when the

operating frequency of the drive is low, e.g., when the operating frequency of the 6kV series is lower than

43Hz and the operating frequency of the 10kV series is lower than 45Hz, the drive will increase the output

voltage of the working unit automatically to ensure that the output performance of the drive remains

unchanged and implement disturbance-free automatic bypassing.


21

For the load such as fan and pump, since the axial power is in proportion to the cube of rotation speed, the

output capability is 83% of the rated output when level -1 unit of the 6kV series is bypassed. Therefore, when

the operating frequency is lower than 43Hz, the drive can still meet the output requirements. Actually, a

margin is reserved in selecting the model of the drive, and this frequency is fairly higher. When the load is high

and the drive cannot meet the output requirements after bypassing, the drive will reduce the operating

frequency automatically until the output current falls within the allowed range (e.g., rated current).

Operation features in case of bypassing level-1 unit

Drive

series

Capacitance decrease ratio

in case of full load (%)

The output is unchanged when the frequency is lower than this value (Hz)

Constant torque load Load such as fan and pump

3kV 33.3 33.3 34.7

6kV 16 43.0 46.4

10kV 11.1 45.0 48.1

2.3 Control System

The control system is composed of main control board, signal board, PLC and flat panel computer. The wiring

relationships are shown in the following figure.

Unit U1

Unit U2

Unit Un

Unit V1

Unit V2

Unit Vn

Unit W1

Unit W2

Unit Wn

Ma

in c

on

trol b

oa

rdS

ign

al

bo

ard

Site

DCS system

Ma

n-m

ach

ine

in

terfa

ce

Analog signal

Control diagram of AESMV drive

The data signals are transmitted to the power unit through fibers. The main control board sends the PWM

signals or working mode to the unit periodically. The unit receives the triggering instruction and state signals

through fibers, and sends the fault signals back to the main control board at the time of fault.


22

The signal board collects the input voltage, current and output voltage, and current signals of the drive,

isolates and filters the analog signals and converts the position. The converted signals are used for controlling

and protecting the drive, and provided to the data collection board of the flat panel computer.

The main control board is a high-speed chip microprocessor. It implements all functions of motor control, and

generates the PWM 3-phase voltage instructions by using the spatial vector mode of sine wave. The main

control board exchanges data with the flat panel computer through the RS232 communication port, provides

the state parameters of the drive, and accepts the parameter settings from the plat panel computer.

The flat panel computer runs a Windows XP operating system, provides friendly operating interfaces for the

user, and is responsible for data collection, information processing and communication with the outside, and

optional host monitoring to implement networked control of the drive. Through the 32 -channel high-speed

data collection card, the flat panel computer collects the analog signals from the signal board, calculates the

operation parameters such as current, voltage, power, and power factor, provides the metering function and

waveform display function, and implements overload and overcurrent alarm and protection for the motor. The

flat panel computer is connected with the main control board through the RS232 communication port,

connected with the PLC through the RS485 communication port, and monitors the state of the drive system in

real time.

The PLC is used for logical processing of internal ON/OFF signal of the drive, on-site operation signals and

state signals, and enhances the flexibility of applying the drive on the site. The PLC provides the capabilities

of processing 4-channel analog input and 3-channel analog output. The analog input is used to process the

analog signals from the site such as traffic and pressure, or the setting signals sent during the analog setting.

The analog output signals may be operating frequency, current, voltage, power, and power factor. The PLC

can also implement the PID function.

3. User Interface

The AESMV medium voltage drive series provide a 10.4 inch,touch-screen LCD monitor on the right side of

the control cabinet. The monitor has a touch screen. The user interfaces are based on a full -Chinese

Windows XP operating plat form, and enable all operations on the drive. The user interface can be locked.

Only the authorized operators can access the interface and modify the parameters, thus ensuring security of

operations.

When operating on the touch screen, do not strike the screen with rigid objects such as nail, but touch the

screen gently through the forepart of the finger to prevent scratch of the screen.


23

3.1 Main Monitoring Interface

Main monitoring interface

The above figure is a main interface of the drive. Through the main interface, the user can set functions and

parameters of the drive, and query the operation logs and faults. Through the main interface, the user can

start the drive directly, set the operating frequency, and perform decelerated stop, emergent stop and

resetting. In the remote control mode, emergent stop and decelerated stop are disabled. Now we int roduce

the functions of the buttons in the main interface:

1) Accelerate: For increasing the preset frequency. Click this button to increase the frequency by 0.1Hz at a

time; hold down this button to increase the step length continuously. The maximum step length of the

frequency is 0.5Hz. When the preset frequency reaches the set maximum frequency, this button is

disabled. In case of closed loop operation, this button changes to a button for increasing the preset value

of the controlled parameter. If the user chooses the analog presetting mode, this button will be inactive,

and the preset frequency or the preset value of the controlled parameter is derived from the analog

signals after analog-digital conversion.

2) Decelerate: For decreasing the preset frequency. Click this button to decrease the frequency by 0.1Hz at

a time; hold down this button to increase the step length continuously. The maximum step length of the

frequency is 0.5Hz. When the preset frequency reaches the set minimum frequency, this button is

disabled. In case of closed loop operation, this button changes to a button for decreasing the preset

value. If the user chooses the analog presetting mode, this button will be inactive.

3) Start: This button sends the start command to the drive. In remote control, this button is disabled.


24

4) Decelerate to stop: This button sends the shutdown command to the drive. If the user selects “remote”

for the “local/remote” switch, this button will be inactive, and the operation of decelerating to stop will be

controlled remotely.

5) In case of local control, after the user sends the shutdown command through the “decelerate to stop”

button, the drive will decelerate at the set deceleration time until stop. While the motor is decelerating,

the user can recover the start and operation state of the drive from the current speed anytime through the

start button.

6) Emergent stop: After the user presses this button, the drive will block output immediately. Namely, the

output voltage is zero. The motor stops after losing power supply. If the user selects “Remote” for the

“Local/remote” switch, this button will be inactive. In case of emergency, the user can snap the medium

voltage self-locking breaker on the cabinet door quickly, and cut off the input power supply of the drive

directly.

7) Reset: This button resets the drive to the default state after power-on. Once the drive fails, it will enter the

fault protection state automatically. In this state, the primary power supply of the drive cannot be switched

on, and the drive cannot be restarted. When the fault is eliminated, the fault state will be cleared, and the

drive restores the normal state of the system.

8) Exit: The user can choose to exit the monitoring program of the drive, turn off the flat panel computer, or

restart the flat panel computer. In the operation state, exiting this program may make the drive out of

control. Therefore, it is necessary to shut down the system before exiting the program. For details, see

§3.6.

9) Function setting: This button enables you to set and select functions. For details, see §3.2 System

Function Setting.

10) Parameter setting: This button enables you to set the parameters such as drive, motor, PID adjustment,

analog input, analog output, and host communication. The parameters of drive and motor are modifiable

only after shutdown. For details, see §3.3 Parameter Setting.

11) Fault monitoring: This button enables you to query the past and current states of the drive. You can view

up to 200 entries of fault information. For details, see §3.5 Fault Query.

12) Operation log: This button displays the operation logs and can store them into a floppy disk or print them

out. For details, see §3.4 Operation logs.

13) Set frequency: This button enables you to input a preset frequency to the drive through the software

keypad. When the input frequency value is less than the minimum frequency or greater than the

maximum frequency, the preset frequency value will be corrected to the minimum or maximum frequency

automatically. In case of closed loop operation mode, this button changes to a button for presetting the

input controlled parameters (e.g., air pressure, flux). If the user chooses the analog presetting mode, this

button will be inactive, and the preset parameter is derived from the analog signals after analog-digital

conversion.

In the parameter setting, if a skipping area is set for the drive parameter “skipping frequency”, when the user

presets the frequency in this area according to the set frequency, the value will be corrected to the lower limit

of the skipping frequency automatically; when the user presets the frequency through acceleration, the value

will skip from the lower limit of “skipping frequency” to the upper limit directly. Likewise, when the user presets


25

the frequency through deceleration, the value will skip from the upper limit of “skipping frequency” to the lower

limit directly.

The main interface of the drive provides real-time display of 6 main operation parameter values of the drive in

addition to the above buttons, as described below:

1) Set frequency: This parameter displays the preset frequency of the drive. The user can input the value

through the software keypad (press the “Set frequency” button, and the software keypad will pop up. See

§3.7). This parameter value can also be changed through the acceleration/deceleration button, or set

through the analog signal. In the closed loop operation mode, the preset value of the controlled

parameter will be displayed here.

2) Operating frequency: Displays the current output frequency of the drive. In case of open loop operation,

the operating frequency may be shortly unequal to the preset frequency value in the process of

acceleration/deceleration of the drive as a result of the acceleration/deceleration time. After the drive

gets into the stable state, the operating frequency value is equal to the preset frequency value. In case of

closed loop operating mode, the operating frequency is adjusted by the drive automatically in real time.

3) Rotation speed of motor: Displays the asynchronous rotation speed of the motor. This value may differ

from the actual rotation speed of the motor slightly. The unit is rotation/minute (r/min).

4) Actual pressure: Displays the actual value of the process variable, e.g., air pressure, flux, and

temperature. If the user selects “None” for the analog feedback item in the function, the parameter value

displayed here will be “None”.

5) Output current: Displays the output current of the drive. The unit is Ampere (A). In the speed-regulating

operation process of the drive, the input power factor is far higher than the output power factor, and the

output voltage decreases in proportion to the operating frequency. Therefore, the output current is

generally greater than the input current.

6) Output voltage: Displays the output voltage of the drive. The unit is Volt (V). The output voltage is in

proportion to the operating frequency. When the input voltage is higher than the rated voltage, the

automatic voltage adjustment function of the drive works, and the output voltage is decreased to some

extent.

7) System standby: Displays the current state of the drive.

a) System standby: The drive is normal, the medium voltage drive is powered on and ready for starting.

b) Operating: The drive is in the normal operating state.

c) Major fault of unit: A major fault has occurred on a unit, which disrupts the operation. The user can

query the fault causes through the fault state.

d) External fault: A major fault occurs on the transformer, load, or motor. The fault causes are displayed

under the current time on the right side. The user can also query the fault state.

8) Display of control mode:

Local: The “remote/local” switch is set to “local”.

Remote: The “remote/local” switch is set to “remote”.

9) Display of presetting mode:


26

Digital presetting: The user selects “Digital Presetting” for the function setting mode option.

Voltage presetting: The user selects “0~5V” for the function setting mode option.

Current presetting: The user selects “4~20mA” for the function setting mode option.

Host presetting: The user selects “Enable” to enable setting of the functions through host presetting.

3.2 Function Setting

The “Function Setting” interface enables you to select the system functions, as shown in Figure 3.4.

After you press the function setting button on the main interface, a software keypad (see §3.7) will pop up to

prompt you to input the primary password or advanced password, as shown in Figure 3.2. You can access the

function setting page only after the password is confirmed. If the password is incorrect, a prompt box will pop

up to prompt you to exit, as shown in Figure 3.3.

Figure 3.2 Password input Figure 3.3 Incorrect password

The “Function Setting” interface contains 10 function options, 1 main interface locking checkbox, and primary

password and advanced password buttons for changing the password. While the drive is operating, the <OK>

is invalid, and the function options are disabled, but the main interface locking and th e password change are

enabled online.


27

Figure 3.4 Function setting

3.2.1 Control State

This option is used for system debugging. After you select the debugging state, you can set the parameters of

the drive and debug the system without operating the medium voltage main loop.

Normal state: Normal cont rol state (default). The power unit is under normal monitoring and

protection.

Debugging state: The drive ignores the power unit state, and can implement overall debugging of

software when no power unit or medium voltage power supply exists. In the

debugging state, the medium voltage switch-on function is disabled automatically.

3.2.2 Operation Mode

Open-loop operation and closed-loop operation of the drive are optional.

Open loop operation: The operating frequency of the drive is preset by the main interface or the external

analog signal after analog-digital conversion. This is a default operation mode.

Closed loop operation: In the closed-loop operation mode, i f the user selects the digital presetting mode,

the acceleration/deceleration button on the main interface will change to the button

for increasing or decreasing the preset value of the controlled parameter, and the

user can set and adjust the expected value of the controlled parameter (e.g.,

pressure, temperature). If the user selects the analog presetting mode, the

expected value will be preset according to the analog signal, and the drive will

adjust the output frequency of the drive automatically according to the PID


28

parameter set in the PID adjustment parameters in light of the actual value and the

expected value of the controlled parameter. This will make the actual value keep

abreast of the expected value of the controlled parameter.

3.2.3 Parameter Setting

This function specifies whether to enable parameter setting.

Enable setting: This option enables you to set the parameters such as drive, motor, PID adjustment,

analog input, analog output through the main interface.

Disable setting: This option enables you to view the parameters in the parameter page through the

“Parameter setting” button, but no modification will be effective or saved by the

system.

3.2.4 Host Control

The AESMV-Y drive series can be controlled through the host to perform decelerated stop, emergent stop and

reset. To activate this function, select “Enable”. If you do not allow the host to control the drive, select

“Disable”. By default, the host control is disabled.

3.2.5 Host Parameter Setting

Most parameters of the AESMV-Y drive series can be set and modified through the host. To activate this

function, select “Enable”. If these parameters of the drive are modifiable only on the local machine and not

changeable by the host, select “Disable”. By default, the host presetting is disabled.

3.2.6 Presetting Mode

This function enables you to select the presetting mode of the drive. In the open-loop operation mode, the

frequency is preset; in the closed-loop operation mode, the controlled parameter (e.g., air pressure) is preset.

1) Digital presetting: In case of open loop, the preset frequency is set through the acceleration button,

deceleration button or frequency setting button on the main interface or through the host. In case of

closed loop, the preset value of the controlled parameter is set through the “increase preset” button or

“decrease preset” button on the main interface or through the host.

2) 0-5V: This presetting mode receives the external 0 -5V analog setting signal, and obtains the preset

frequency or the preset value of the controlled parameter after analog-digital conversion.

3) 4-20mA: This presetting mode receives the external 4 -20mA analog setting signal, and obtains the preset

frequency or the preset value of the controlled parameter after analog-digital conversion.

4) Multi-level presetting: Multi-level speeds are set through the remote button. When communication setting

and multi-level speed setting concur, the multi-level speed is preferred. When the system is shut down,

the user can press the reset button to clear the set speed level. For the set frequency corresponding to

the speed level, see §3.3.5 Host Communication.

5) Host presetting: The drive can set the frequency through communication with the host.


29

3.2.7 System Bypass

By default, this function is disabled and no system bypass device exists.

In order to ensure the operation reliability of the whole system, the AESMV drive series provides system

bypass optionally. If the user selects a proper bypass device (in the bypass cabinet in the following figure,

k1~k3 are vacuum contactor or breaker; if the manual isolation switch is in use, the system bypass can only

be performed manually), and enables system bypass in the function options, the drive will block output

immediately and cut off the medium voltage input and the drive output switches k1 and k2 once the drive

becomes faulty and cannot go on operating or further fault occurs on a unit after the two levels of units are

bypassed. After 1 second of delay, the mains frequency bypass switch k3 will be turned on to put the motor

into operation in the mains supply network.

When the drive needs to exit the operation for maintenance or repair without affecting the normal operation of

the motor, the user can send a command to the drive through the mains frequency button controlled locally or

remotely. At this time, the drive adjusts the output frequency to the mains frequency. Upon reaching the mains

frequency, the drive will block the output immediately, cut off the medium voltage input and drive out switches.

After 1 second of delay, the drive will turn on the mains bypass switch, and put the motor into operation in the

mains supply network.

If the user does not select any proper bypass device, the system bypass option must be disabled. In this case,

when the drive becomes seriously faulty and cannot go on operating, the drive will block t he output

immediately, and let the driven motor stop freely.

High-voltage bus

Upper-

level

switch

cabinet

WIN-HV

high-voltage

drive

Bypass

cabinet

High-voltage motor

Figure 3.5 Main loop with system bypass

AESMV


30

3.2.8 Main Interface Locking

By default, this option is disabled.

After this option is enabled, the buttons such as “Emergent stop”, “Decelerated stop”, “Start”, “Frequency

preset”, “Accelerate”, “Reset” and “Exit” in the main interface will be greyed and disabled, and the user will be

unable to perform controlling operations on the drive, but can only view the state through t he buttons such as

“Operation log” and “Fault”. (The function setting and parameter setting are not accessible unless the user

inputs the correct password.)After the main interface is locked, unauthorized operations on the drive are

prevented.

After the main interface is locked, when an emergency occurs, the user can snap the medium voltage

self-locking breaker on the control cabinet door to cut off the IO medium voltage loop of the drive and protect

the equipment and persons.

The procedure of unlocking the main interface is similar to the locking procedure. The user inputs the

password to access the function setting page and disables the main interface locking.

3.2.9 Primary Password and Advanced Password

Each primary or advanced password consists of up to 9 digits. The default password is 0.

Primary password: A primary password must be input to access the function page or the parameter page

to prevent illegal modification. This button is used to change the primary password for

accessing the function page and the parameter page. After this button is pressed, the

system will prompt the user to input an advanced password. After the advanced

password is confirmed, the system will go to the next step and let the user input a new

primary password. Then the system prompts the user to input the new primary

password again for purpose of confirmation. If the passwords input in the two

attempts are consistent, the user can click <OK> to finish changing the password.

Advanced password: Before changing the primary password or the advanced password, the user must

input the correct advanced password. The advanced password can be used in place

of the primary password to access the function page and the parameter page. The

procedure of changing the advanced password is similar.

3.3 Parameter Setting

The user can click the “Parameter setting” button in the main interface to set parameters. Before this, the user

needs to input the primary or advanced password to get authenticated, as described in the preceding section.

To make the parameter modification effective, the user must select “Enable” in “Function Setting -> Parameter

Setting”.

The parameter setting interface contains four tabs: Drive, Motor parameter, PID adjustment parameter,

Analog input parameter, Analog output parameter, and Host communication.

OK: The user clicks this button to confirm all modifications made in the four parameter pages, save them

and exit the parameter setting. If the “Parameter Setting” option is disabled, the drive is operating or

the communication is not established, this button is greyed and the modifications will not take effect.


31

Cancel: This user clicks this button to cancel the modification and exit the parameter setting.

3.3.1 Drive and Motor Parameters

If the “Parameter Setting” option is disabled, the drive is operating or the communication is not established,

the modification of the drive and motor parameters will not take effect. The parameter setting page is shown in

the following figure.

The modified parameters will take effect after you click <OK> below.

Figure 3.7 Parameter setting

The drive parameters and the motor parameters can be set through the pop-up software keypad by pressing

the corresponding buttons of the parameters. After the parameter is modified, press <Cancel> to cancel the

modification, or click <OK> to save the modified parameter values, whereupon the system will operate

according to the new parameter values.

3.3.1.1 Drive Parameters

1) Reference frequency: The operating frequency value existent when the drive outputs the reference

voltage. It is the power frequency on the motor nameplate. The setting range is 0~51Hz, the resolution is

0.1Hz, and the default setting of the system is 50Hz.

2) Reference voltage: Voltage value output when the motor operates under the reference frequency. It is the

rated voltage on the motor nameplate. The setting range is 380~10000V, and the resolution is 1V. For

3kV, 6kV and 10kV drive series, the default values are 3000, 6000 and 10000.

When the operating frequency of the drive exceeds the reference frequency, the reference voltage value

remains unchanged as the output voltage.


32

Reference frequency Maximum frequency

Ou

tpu

t vo

ltag

e

Reference

voltage

Output frequency

Figure 3.8 Relationship between reference frequency and reference voltage

3) Upper limit frequency: upper limit frequency output when the drive operates continuously. The setting

range is 0.1 Hz ~ maximum frequency. The resolution is 0.1Hz, and the default value is 50Hz.

4) Lower limit frequency: lower limit frequency output when the drive operates continuously. The setting

range is 0.1 ~ maximum frequency. The resolution is 0.1 Hz, and the default value is 3 Hz.

5) Maximum frequency: the maximum frequency output when the drive operates continuously. The set

range is 0.1 Hz ~ 60Hz. The resolution is 0.1Hz, and the default value is 50Hz.

Set frequency

Maximum frequency

Ou

tpu

t freq

ue

ncy

Minimum frequency

Figure 3.8 Relationship between the minimum frequency, maximum frequency and set frequency

When the set frequency value (including digital setting and analog setting) is greater than the maximum

frequency, the system will correct it to the maximum frequency automatically. When the set value is less

than the minimum frequency, the system will correct it to the minimum frequency automatically. This can

prevent the user from setting a too high frequency greater than the rotation speed range allowed by the

device, which causes damage to the device. The set value of the maximum frequency shall not be less

than set value of the minimum frequency.

6) Initial frequency: Initial start frequency of the drive. The set range is 0.1 Hz ~maximum. The resolution is

0.1Hz, and the default value is 0.5Hz.

Note: If the initial frequency is too high,it may result in the overcurrent fault of the inverter’s output


33

7) Acceleration time: The time taken for the motor to change from the static state to the maximum frequency

through acceleration. The set range is 1~255s, the resolution is 4s, and the default value is 15*4s.

Note: If the set acceleration time is too short, the drive may output the overcurrent state. This will trigger

the current-limiting function of the drive and the actual acceleration time of the motor will exceed

the set value.

8) Deceleration time: The time taken for the motor to change from the maximum frequency to the static

state through deceleration. The set range is 1~255s, the resolution is 4s, and the default value is 15*6s.

Note: If the set deceleration time is too short, the drive may generate the overvoltage fault.

9) Torque elevation: The output voltage under the corresponding frequency can be increased to elevate the

torque of the motor which runs at a low speed. The set range is 0~15. The va lue “0” means no elevation,

and the value “15” means elevation to the utmost.

Note: If the torque elevation is too high, the drive may output the overcurrent state. This will trigger the

current-limiting function of the drive. The torque elevation value should be set according to the

actual load.

Output frequency

Ou

tpu

t vo

ltag

eAdjustment range

Reference

frequency

Figure 3.10 Torque elevation

10) Drive No.: The AESMV drive series can be monitored through a host. One host can monitor up to 32

drives concurrently. Each drive has a unique address number set through this parameter. This address

number is an identifier for communication between the drive and the host. The serial number range is

0~31, and the default value is 0.

11) Upper limit of skipping frequency 1, lower limit of skipping frequency 1, uppe r limit of skipping frequency

2, lower limit of skipping frequency 2: In the operating frequency range, a resonance point may exist in

the system. The vibration is greater nearby the resonance point. In order to avoid the resonance point,

two skipping frequency ranges are set for the drive. The drive operates outside these two ranges except

in the acceleration or deceleration process.

Upper limit of skipping frequency is the upper limit value of the skipping frequency range. Lower limit of

skipping frequency is the lower limit value of the skipping frequency. If the upper limit is equal to the

lower limit of the skipping frequency, this skipping frequency is invalid.

The set range is 0.1～51 Hz, and the resolution is 0.1 Hz.


34

Output frequency

Set frequency

Maximum frequency

Upper limit of skipping frequency 2

Lower limit of skipping frequency 2

Upper limit of skipping frequency 1

Lower limit of skipping frequency 1

Figure 3.11 Skipping frequency

When the set frequency falls within the skipping frequency range, the drive output frequency will be

adjusted to the upper limit or lower limit of the skipping frequency automatically.

12) Unit bypass level: This option is optional to the power unit. When the power unit has no bypass function,

this option is invalid. This parameter is the number of bypass units allowed for each phase. The

parameters values are 0, 1 and 2.

When a power unit cannot go on working due to fuse fault, overheat or IGBT fault, this unit and the units

on the corresponding positions of the other two phases will bypass automatically. This ensures

continuous work of the drive, and a triggers a bypass alarm. At this time, the number of serial units for

each phase decreases, the output voltage will decrease, and the drive will operate in the derated mode.

For the 6kV drive, every level of power unit reduced will decrease the rated output voltage and the rated

output power by approx. 16%.

0: Unit bypass is not allowed. Once a unit becomes faulty seriously, the drive will abort immediately, let

the motor stop freely, or shift to the mains supply network to continue operating (if the system bypass

is allowed).

1: Only 1 unit can be bypassed for each phase. If more than 1 unit is faulty, the drive will block output

and abort.

2: A maximum of 2 bypass levels are allowed.

13)

Current-limiting current multiple: Percentage of the rated current of the drive. The set range is 10~120,

and the default value is 100. When the ratio of the output current to the rated current of the drive is

greater than this value, the drive will decrease the output frequency automatically and decrease the

output current. In this case, the actual output power may be inconsistent with the set frequency of the

drive. When the output current returns to the allowed range, the output frequency will returns to the

original set frequency.

When the set acceleration time is too short or the torque elevation is excessive, the drive may generate

the current-limiting phenomenon in the acceleration process or if the load increases abruptly.


35

3.3.1.2 Motor Parameters

1) Rated rotation speed: Rated rotation speed of the driven 3-phase medium voltage motor. The parameter

value is specified on the motor nameplate.

2) Rated power: Rated power of the driven 3-phase medium voltage motor. The parameter value is

specified on the motor nameplate.

3) Overcurrent multiple: The percentage of output current of the drive to the rated current of the motor.

When the percentage of the output current to the rated current of the motor is greater than this value,

immediate protection will occur. The default value is 160%.

4) Overload multiple: The percentage of output current of the drive to the rated current of the motor. When

the percentage of the output current to the rated current of the motor is greater than this value, the

system will raise a minor alarm, and the main interface will display motor overload. 1 minute later, the

protection begins. The default value of this parameter is 150%.

5) Number of motor poles: Number of poles of the driven 3-phase medium voltage motor. The parameter

value is specified on the motor nameplate.

6) Rated current: Rated current of the driven 3-phase medium voltage motor. The parameter value is

specified on the motor nameplate. Before initial operation of the drive, especially when the rated power of

the motor is far less than the capacity of the drive, this parameter value must be input so that the drive

can perform overcurrent protection for the motor effectively.

3.3.1.3 Saving and Invoking Parameters

Save parameter: This button enables you to save all current parameters into the hard disk as a data file to

facilitate future use. Such parameters include drive parameters, motor parameters, PID adjustment

parameters, analog input parameters, analog output parameters, and options in host communication and

function setting.

After pressing the <Save Parameter> button, the system will generate a filename automatically according to

the existent parameter file, and save all current parameters into this file. As shown in the following figure, if

you press <Save Parameter> again, the filename will be “ParamCopy2.dat”. The system can save up to 20

backup parameter files. The foremost parameter file is the default setting of the drive. The time of saving the

file is displayed after the parameter filename.


36

Figure 3.12 Saving and invoking parameters

Invoke parameter: This button enables you to invoke the parameters saved in the parameter file, set them to

the current parameter of the system. After you press this button, the system will prompt you to input the serial

number of the file to be invoked. After you make confirmation, the system will complete the invocation process

automatically.

Delete parameter: This button enables you to delete the selected parameter file permanently. After you press

this button, the system will prompt you to input the serial number of the file to be deleted. After you make

confirmation, the system will delete the file from the hard disk automatically. If th e deleted file is not arranged

at the end of the file sequence, the filename and serial number of the files previously arranged at the end will

move forward automatically, but the saving time (which serves as a basic property of the file) will not change.

As shown in the above figure, after the file “ParamCopy2.dat” is deleted, the file name “ParamCopy3.dat”

changes to “ParamCopy2.dat” automatically, the old file name is vacated. Meanwhile, the serial number of the

file changes to “2” but the saving time remains unchanged. Therefore, in the parameter invoking, the saving

time instead of the serial number or filename of the file is worthy of attention.

Default setting: This button enables you to invoke the default setting parameter file, and recover the defau lt

values of the current parameter. Default values of the parameters are relatively secure.

3.3.2 PID Adjustment Parameters

This function is valid only when the operation mode is closed-loop operation. It is used to input the parameters

of the PID regulator. After finishing modification of the parameters in this page, you can click <OK> to make

the modification effective.


37

Figure 3.13 PID adjustment parameters

The PID calculation formula is as follows:

Mn (output) = MPn (proportion item) + MIn (integral item) + MDn (differential item)

1) where,

MPn = kC * (SPn – PVn)

MIn = kC * TS/TI * (SPn – PVn) + MX

MDn = kC * TD/TS * (PVn-1 – PVn)

2) In this formula:

Mn: Calculation output value at the number n sampling time;

MPn: Proportion item value at the number n sampling time.

MIn: Integral item value at the number n sampling time.

MX: Integral item value at the n-1 sampling time (pre-value of integral item). It is the sum of all

integral item pre-values. Every time after the MIn is calculated out, MIn must be used to u pdate

MX;

MDn: Differential item value at the number n sampling time.

SPn: Preset value of controlled parameter at the number n sampling time;

PVn: Process variable at the number n sampling time, i.e., the actual value of the controlled

parameter;


38

PVn-1: Process variable at the number n-1 sampling time. In order to calculate the differential

parameter value next time, it is necessary to save the process variable. In the first sampling

calculation, it is necessary to set PVn-1 = PVn;

kC proportion factor: This parameter decides how the output is sensitive to the deviation, i.e.,

difference between the preset value of the controlled parameter and the

expected value (SPn – PVn). Greater absolute value of this factor will increase

the adjustment speed. But if it is too great, the system tends to oscillate due to

overshooting.

The proportion factor may be positive, negative or 0. In case the integral factor

and the differential factor are positive and the proportion factor is positive, the

drive performs forward adjustment. Namely, if the preset value is greater than

the feedback value, the operating frequency will increase; if the preset value is

less than the feedback value, the operating frequency will decrease. When the

proportion factor is negative, the drive performs reversed adjustment. Namely, if

the preset value is greater than the feedback value, the operating frequency will

decrease; if the preset value is less than the feedback value, the operating

frequency will increase.

In case no proportion adjustment is required, the proportion factor should be set

to 0. When the proportion factor is 0, the PID regulator will calculate the integral

and differential adjustment based on the default proportion factor of 1.

TS sampling time: Calculation period of the PID regulator, measured in seconds. The value must

be positive, and cannot be negative or 0. The default value of this factor is 0.1s.

TI integral time: Integral time constant of the PID regulator, measured in seconds. This value

may be positive, negative but cannot be 0. Generally, it is a positive value.

When the absolute value of this factor is greater, the response speed of the

regulator will be slower.

In case no integral adjustment is required, the integral factor should be set to

infinitely great.

TD differential factor: Differential time constant of the PID regulator, measured in seconds. This value

may be positive, negative or 0. Generally, it is a positive value.

In case no differential adjustment is required, the differential factor should be set

to 0.

For the integral or differential control where the proportion factor is 0, i f the

integral time or differential time is a positive value, the drive will perform forward

adjustment; if it is a negative value, the drive will perform reversed adjustment.

Air pressure setting: This parameter is a default value of the controlled parameter (e.g., air pressure, flux)

when the drive is under closed-loop operation. Generally, when the system is under

closed-loop operation, the expected value of the controlled parameter remains

unchanged. For example, if you expect the system to get stable at a constant

pressure value or temperature value, you can input this desired value.


39

When the system is under closed-loop operation, the user can set the parameter

directly through the “Increase air pressure”, “Decrease air pressure”, or “Preset

air pressure” button in the main interface.

Maximum air pressure: Maximum value of the corresponding controlled parameter when the controlled

parameter sensor of the user outputs the maximum signal.

Minimum air pressure: Minimum value of the corresponding controlled parameter when the controlled

parameter sensor of the user outputs the minimum signal.

Upper limit of alarm: When the actual value of the control parameter of the user is greater than this

value, the drive provides the upper-limit alarm output.

Lower limit of alarm: When the actual value of the control parameter of the user is less than this

value, the drive provides the lower-limit alarm output.

3.3.3 Analog Output Parameters

The AESMV medium voltage drive series provide 3 of analog output channels. The input and output

frequency, pressure and current can serve as output variables. In the analog output signal mode:

0~10V: Means the analog output signal of this channel is 0~10V voltage signal.

4~20V: Means the analog output signal of this channel is 4~20V current signal.

You can select the output variables as required:

Select the output variable at the FM side: Select the variable of the channel at the analog output FM side;

Select the output variable at the VM side: Select the variable of the channel at the analog output VM side;

Select the output variable at the IM side: Select the variable of the channel at the analog output IM side;

The wiring method is described in 5.4.


40

Figure 3.15 Analog output parameters

3.3.4 Host Communication/Multi-level Setting

3.16 Host communication setting


41

3.4 Operation Logs

The AESMV medium voltage drive series record the operation parameters automatically, and generate a

parameter log file everyday. The filename is the date of the day, and the file extension is “txt”. The log file is a

plain text file. For example, the name of the log file on 10 November 2006 is “06_11_10.txt”, and the path is

the default path of this program. The following three types of events can trigger a log:

Periodical record: After the program is started, the operation parameters are recorded periodically. The

interval of recording is the time set through the interval button shown in the following

figure, and the unit is minute. For convenience, the operation parameters are generally

recorded when the current time is a multiple of 10 minutes.

Operation log: Each operation on the drive triggers a log, e.g., startup, decelerated stop, emergent stop,

modifying frequency, and modifying saving interval.

Fault log: Fault of the drive also triggers a log. The operation parameters at the moment before

occurrence of the fault are saved for ease of fault analysis.

Except periodical logs, all the above logs have an identifier word appended to the recording time. The

identifier words are defined below:

Enter – Enter the program Exit – Exit the program Start – Start the motor

Stop – Decelerated stop Emergent stop – Free stop Modify frequency – Modify the

frequency

Modify time – Modify the log

interval

Overcurrent – The motor incurs

overcurrent

Fault – The drive incurs a major

fault

With the operation logs and the fault logs, a complete operation archive of the drive is available.


42

Figure 3.18 Operation logs

Figure 3.19 Incorrect display of date Figure 3.20 Prompt of no record

1) Interval: Time interval of recording the operation parameters. The minimum log interval is 10 minutes.

2) Date: Input the date of the operation logs that you want to view. The format of the date is

Year_Month_Day. The default date is the current date. If the input date (year, month or day) is incorrect,

the system will give a prompt shown in Figure 3.19 and exit the date input. If no operation logs exist for

the selected date, the system will give a prompt shown in Figure 3.20.

3) Previous: View the logs on the day prior to the displayed date;

4) Next: View the logs on the day next to the displayed date;

5) Delete: Delete the log file of the selected date;

6) Accumulated operation time: Accumulated number of hours for the variable speed drive to drive the

motor after delivery from the factory.

7) Ongoing operation of drive: Accumulated number of hours of non -interrupted operation of the drive. This

parameter will be cleared to zero after the drive stops output or the monitoring program exits.

In the logs, some parameter values may be zero because the signals of such parameters are not input to the

signal board in the practical application. In the logs shown in Figure 3.18, all pressure values are 0.


43

3.5 Fault Information

Figure 3.21 Fault information (10kV 27 unit series)

The user may enter the fault information window through the fault monitoring button on the main interface to

know the current state of the system and history fault information, including fault occurrence time, caus es and

location, for ease of handling.

Once a major fault occurs in the system, the program will enter the fault information query window. The

current fault is in the blinking state, and sends out the alarm signals.

1) Drive system information: Displayed on the upper left side of the window, and located to the left of the

fault time (which is the current time when the current state is displayed). Fault information includes:

Overcurrent of drive, major fault of unit.

2) Unit information: Located in the middle of the window. The power units are arranged vertically into three

groups by phase. Possible information includes: Normal, fault.

Introduction to buttons on the right side of the figure:

1) Serial number: The serial number of the fault in the logs (the maximum number of logs is 200). The value

“0” means the first fault state; the value “1” means the first previous log, and so on. The total number of

logs is displayed above the serial number. When the total number of logs is 200 and further fault occurs,

the system will delete the existing log 1, and the subsequent logs will move forward by one position, and

new fault is logged at position 200. This prevents the total number of logs from exceeding 200. When the


44

user accesses the fault information page from the fault button of the main interface, the default serial

number is the latest fault log.

2) Delete this: Delete the fault log currently displayed, whereupon the total number of logs will decrease by

1, and the subsequent logs will move forward accordingly. Before deletion, the system gives a prompt to

prevent mistaken operation.

3) Delete all: Delete all fault logs. Before deletion, the system asks whether the user really wants to delete

all fault logs. This can prevent mistaken operation.

4) Previous: Display the previous log. The log prior to the first one is the current state, and the log prior to

the current state is the last fault log.

5) Next: Display the next log. The fault log next to the last one is the

current state, and the log next to the current state is the firs t fault

log numbered “1”.

3.6 Exit

This button is used to exit the monitoring program, as shown in Figure

3.22. The user can exit the program in several optional ways.

1) Exit monitoring program: Go back to the Window desktop.

2) Shut down computer: Exit all underway programs and shut down

the flat panel computer.

3) Restart computer: Exit all underway programs and restart the

computer.

3.7 Software Keypad

Once the system requires the user to input a password or modify a

parameter, the program will pop up a software keypad, as shown here

on the right side. The upper left part of the keypad displays the

parameter name and unit input by the user, and the right part displays

the input data.

1) Backspace: Delete the rightmost digit.

2) Clear: Delete all input, and set to the default value “0”.

3) Exit: Exit the keypad after invalid input.

4) OK: Confirm the input, assign a value to the parameter, and exit

the keypad.

Figure 3.22 Exit

Figure 3.23 Software keypad


45

4. Installation

4.1 Installation and Storage Environments

Fire or explosion may occur if the drive is installed in an environment with flammable gas, explosive gas or

dust. The drive must stay away from the such hazardous environments even if the explosion-proof motor can

be installed in such environments.

Ambient temperature affects the service life and reliability of the drive significantly, so do not install the drive

on a site with a temperature higher than specified. If the ambient temperature of the drive is higher than the

allowed temperature, it is recommended to strengthen ventilation or apply air conditioners t o decrease the

temperature to the allowed range.

The efficiency of the AESMV-Y medium voltage drive series is 96%. The loss of 4% is basically converted to

heat. If fans are applied, the ventilation volume for every 10kW of loss shall not be less than 1m3/s; if air

conditioners are applied, the power of air conditioners for every 10kW of loss shall not be less than 4P.

Installation environment

Item Requirements

Ambient temperature 0~40°C

Relative humidity < 90% (No condensate)

Altitude < 1000m

Operation

environment

Avoid direct sunlight, corrosive gas, explosive gas, conductive particles, water

drip, salt, smoke, and dust.

Operation site Indoor

Note: 1. Even if the relative humidity falls within the foregoing allowed range, condensate may occur i f the

temperature changes sharply.

2. When the drive is installed at a height greater than 1000m, decrease the capacity by 1% for every

100m beyond the 1000m altitude.


46

Storage environment

Item Requirements

Storage temperature -40~70°C

Relative humidity < 90% (No condensate)

Storage environment Avoid direct sunlight, corrosive gas, explosive gas, conductive particles, water

drip, salt, smoke, dust and vibration.

Note: Storage temperature refers to the short-term temperature during the transport. If the storage period is

very long, keep the storage temperature below 30°C in order to prevent early deterioration of the

electrolytic capacitor.

4.2 Installation Space

While the drive is operating, the transformer and the power unit generate heat equivalent t o 4% of the output

power. In order to dissipate the heat generated by the drive, a cooling fan is installed on both transformer

cabinet and unit cabinet. Therefore, an enough space must be reserved for installing the drive and ensuring

smooth flow of the cooling air.

The air ducts of the drive are shown in the following figure. An enough space must be reserved above, before

and behind the drive cabinet. The distance between the cabinet back and the wall shall not be less than

800mm. The distance between the cabinet top and the roof shall not be less than 800mm. The distance

between cabinet front and the wall shall not be less than 1500mm (the touch screen is installed in the front of

the control cabinet for ease and safety of operation).

Centrifugal fan

Air inlet

Air outlet Air outlet

Filter layer

Air inlet

Power unit

Independent

air duct

Filter layer

Centrifugal fan

Air outlet Air outlet

Tra

nsfo

rme

r

Air inlet

FrontFront

Air duct of unit cabinet Air duct of transformer cabinet

In order to further decrease the ambient temperature of the drive, the user can install a centralized ventilative

air duct to dissipate the heat out of the room along the air duct through the centrifugal fan.


47

4.3 Installing the Cabinet

In the installation process, prevent collision and vibration of the drive. Do not put the upside of the drive down.

The tilt angle shall not be greater than 30°. Before installation, the transformer and the transformer cabinet are

fixed into a whole. Therefore, do not use the lifting eye on the cabinet body, but use the suspension hole on

the transformer directly for purpose of hoisting. In order to prevent deformation of the cabinet, the included

angle between the suspension rope and the cabinet body shall not be less than 60°, as shown in the following

figure. In order to reduce the suspension height, the transformer cabinet and the control cabinet/unit cabinet

can also be suspended by hoisting the bottom (in case the cabinet depth is less than the width). Take extreme

care when during the hoisting to prevent collision or scratch.

Hoisting the control cabinet/unit cabinet

Generally, a mains frequency bypass cabinet should be configured for the system so that the motor can be

put into the mains industry supply network for operating at a fixed speed in case the drive is faulty or being

overhauled. The bypass cabinet is generally deployed to the left of the drive cabinet.

For safety and convenience of cabling, the cabinet body of the drive is set in the cable trough, as shown in the

following figure. The width of the cable trough is determined according to the total width of the drive and the

bypass cabinet (if any).

The cabinet body shall be installed on the pedestal firmly, and connected with the earth of the factory firmly.

The shielding layer and the grounding terminal of the transformer shall be connected to the earth of the factory,

and the grounding resistance shall not be greater than 4Ω. The cabinets are interconnected into a whole on

the column through M10 screws.

? ? ? ? ?

? ? ? ? ? ? ? ? ?

? ? ? ?

? ? /? ? ? ? ? ?? ? ? ?? ? ? ?

? ? ? ? ? ? ? ?


48

Fan

Drive

Front

Cable

trough

Cable trough

5 Wiring

1) Before wiring, check whether the sectional area of the conductor and the voltage grade meet the

requirements. The main transformer and the medium voltage cable must undergo a voltage-resistant test.

During the test, do not connect the power unit.

2) Do not lay the power cable and the control cable in parallel for a long distance. The analog signal cable

and the communication cable must be shielded twisted pair, and the shielding layer shall be grounded at

one end.

3) Upon completion of cable distribution, check:

4) Whether all cables are laid correctly.

5) Whether any terminal or cable is short-circuited itself or short-circuited to earth;

6) Whether any conductor connection is omitted; and

7) Whether the insulation between the wiring terminals and the creepage distance meet the requirements.

5.1 Main Circuit Wiring

The typical wiring of primary loop is shown in the following figure, where the power distribution cabinet,

bypass cabinet and connection cables are provided by the user. The inverse time lag overcurrent, grounding

and undervoltage protection units and lightning arrester applicable to ordinary motors shall be installed for the

power distribution cabinet. Differential protection may also need to be installed, depending on the capacity of

the motor and the short -circuit capacity. However, the lead-in current mutual inductor of the differential

protection unit shall be installed at the lead-out side of the drive. That is because the AESMV drive adopts the

AC-DC-AC mode, and the input current differs from the output current of the drive in amplitude, frequency and

phase.


49

3-phase voltage supply<

Power distribution cabinet

WIN-HV high-voltage drive

Bypass

cabinet

System wiring diagram

A bypass cabinet is recommended so that the production will not be affected during the maintenance and

repair of the drive. After the drive stops operation, the motor can operate through the mains frequency of the

bypass cabinet. The switches k1, k2 and k3 in the bypass cabinet may be vacuum contactor or manual

isolation switch, as required by the user. In case the switch is a vacuum contactor, the motor can implement

automatic shift from variable frequency to mains frequency through the built -in PLC of the drive.

The primary loop is wired in the drive cabinet. The wiring location is shown in the following figure. The lead -in

wire of the drive is connected to the R, S and T terminals, and the lead-out wire of the drive is connected to U,

V and W terminals.

AESMV


50

Location of lead-out wire of drive

5.2 Layout of Main Loop Terminal

A B C G

U V W

Description of main loop terminal:

A, B, C: AC power input terminals, connected to 3-phase AC power supply.

U, V, W: Output terminals of the drive, connected to 3-phase AC motor.

G: Grounding terminal, connected to the earth.

5.3 Wiring Terminal of Control Power Supply

The control power supply is a 1-phase 220VAC power supply. To use it, just connect the power supply to the

1-phase switches L and N.

This drive adopts two channels of power supplies, where the industrial computer and the PLC power supply

come from this 220V power supply. When the power supply fails, the drive can still operate, but the drive will

变频器出线接线室

变频器进线接线柱


51

get out of control and cannot operate normally unless the control power supply is recovered. During normal

operation, make sure this power supply is safe and reliable.

5.4 Wiring of Control Loop

5.4.1 Description on Layout of Wiring Terminal of Control Loop

Three groups of wiring terminals are laid out in the control cabinet: Input wiring terminal, output wiring terminal,

analog IO wiring terminal, and RS485 wiring terminal, as described below:

1) Layout of input wiring terminal block:

P24 RUN STOP F/R RST EER BO X1 X2 X3 NC X4

X5 X6 NC X7 X8 X9 NC P24 NC NC NC NC

2) Layout of output wiring terminal block:

COM TA1 TA2 TA3 TA4 NC TA5 TA6 TA7 COM NC NC

BOFF BEN BON NC LO


52

3) Layout of analog IO terminal block:

VG IG VF IF GND NC FM0 FM1 VM0 VM1 IM GM

4) Layout of RS485 wiring terminal block:

SG+ SG- NC NC

5.4.2 Description on Functions of Control Loop Terminal

Type Terminal

symbol Name Function description Signal level

Input

control

signal

P24 +24V +24V power supply ---------

RUN Run “1”: External terminal is

running

The value is “1”

when connected

with P24.

The value is “0”

when disconnected

with P24.

STOP Stop “1”: Stop

F/R Forward/reversed control

terminal “1”: Forward rotation

RST Reset terminal “1”: System reset

EER External fault input “1”: External fault

BO External bypass input “1”: External bypass request

X1~X3 Multi-section speed input

terminal “1”: Valid

X4~X9 Multi-function input Reserved

Output

TA1~TA4 Multi-function output terminal Programmable output 250V/1A

TA5~TA7 Reserved

COM Public side of TA1~7 terminal


53

Type Terminal

symbol Name Function description Signal level

NC Null, not connected

BEN Bypass allowed Disconnect drive from motor 250V/1A

BON Bypass utilized

Mains frequency power

supply is routed to the motor

through bypass.

250V/1A

BOFF Medium Voltage breaking of

drive

Cut off primary power supply

of the drive 250V/1A

LO Bypass public side

Analog

IO

signal

VG Analog preset input of voltage 0~5V / 100% 0~5V

IG Analog preset input of current 4~20mA / 100% 4~20mA

VF Voltage feedback signal 0~5V 0~5V

IF Current feedback signal 4~20mA 4~20mA

GND Preset and feedback public side Signal power supply ground 10V/50mA


FM0 FM analog output side Analog voltage output 0~10V

FM1 FM analog output side Analog current output 4~20mA

VM0 VM analog output side Analog voltage output 0~10V

VM1 VM analog output side Analog current output 4~20mA

IM Reserved Analog output

GM Public side Public side of analog output

RS485

SG+ B

SG- A



54

5.4.3 Standard Wiring

Standard wiring of AESMV series

Mains frequency bypass diagram

R U

S V

T W

AESMV

BOFF

BEN

RUN BON

STOP LO

F/R

RST TA1

ERR TA2

BO TA3

X1~X3 TA4

X4~X9 TA5

P24 TA6

TA7

COM

VG

IG FM

VF VM

IF IM

GND COM

SG+

G SG-

Main loop power

supply

3φ50/60HZ

1.5~10kV

Run

Stop

Multi-section speed

External analog frequency

0~10V

4~20mA

Multi-function

Relay output

Frequency output

Voltage output

Reserved

Forward/reversed rotation

Analog voltage feedback

Analog current feedback

模拟电流反馈

M

3-phase current

Asynchronous

motor

System reset

External fault

Shift to bypass

Standby

Man-machine

interface

RS485

Connected to host

～220V

C1

C2

C3

Medium Voltage

breaker

Allow bypass

Shift to bypass


55

5.4.4 Wiring Precautions

1) The input signal cable shall be shielded and wired separately, and should be preferably away from the

main loop.

2) In order to avoid misoperation caused by interference, the control loop cables should be twisted shielded

cables, and the wiring distance shall be less than 50m.

3) Do not let the shielded cable contact other signal cable or device enclosure. Use insulative adhesive tape

to bind the bare shielded cable.

4) The RS485 communication port is connected to the communication port of the host, e.g., DCS system.

Use shielded twisted pair or coax cable, and pay attention to the positive and negative poles of signals.

5) Use P24V power supply for remote control through multi-core shielded cables.

6) Use P24V power supply for multi-section speed input through multi-core shielded cables.

7) Use dry contact for all digital input through multi-core shielded cables.

8) Analog preset signals shall be wired separately, and must adopt shielded cables.

9) Feedback signals shall be wired separately, and must adopt shielded cables.

6. Operation

The AESMV medium voltage drive can be controlled from different places in different ways. The control

modes include:

Local control;

Remote control;

Host control.

The user interface direct control and cabinet door control are operated on the drive directly, and are

collectively called “local control”. In these control modes, the cabinet control is of the highest priority, and

takes effect anytime Decelerated stop and free stop in the user interface are effective only if “local control” is

selected for the “remote/local” switch. In the remote control, medium voltage breaking is always effective, but

the decelerated stop and reset are effective only if “remote control” is selected for the “remote/local” switch.

The host control is effective only if the user selects “enable” in “Function Setting” -> “Host Control”.

6.1 User Interface Control

The main interface accepts the user instructions through the touch screen. The touch screen is installed on

the front door of the control cabinet, and provides visual, simple operations and complete functions. When

using the touch screen, do not strike with rigid objects (including nail), but touch it gently.

Start: When the system detects that everything is ready, the main interface will

display “system standby”. At this time, the motor can be started by pressing

the Start button. In the decelerated stop, the Start button is effective, and the


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motor will elevate from the current speed to the speed existent before stop

once the button is pressed.

Decelerated stop, free stop: This button is effective only if the user selec ts “local” for the “remote/local”

switch on the cabinet door. In case of remote control, if you want to stop the

system through the main interface, you can flick the selection switch to “local”.

In emergencies, you can also snap the medium voltage self-locking breaker

on the cabinet door, and let the motor stop freely.

Reset button: This button is used to eliminate the drive fault memory (if the fault still exists,

the fault state will remain after resetting). When the system is abnormal, the

user can use the Reset button to recover the power-on default state of the

control system. Note that the Reset button is not effective during the operation

to avoid mistaken stop.

The user can perform sophisticated functions on the main interface such as parameter setti ng, function

setting, fault query and waveform display. For details, see §4 User Interface.

6.2 Cabinet Door Control

On the front door of the cabinet door, the medium voltage self-locking breaker (red), system reset button (red),

mains frequency shift button (green or black) and remote/local switch (black) are laid out from right to left on

the lower side of the touch screen. The cabinet control is of the highest priority, and is effective anytime.

6.2.1 Medium Voltage Breaker

In case faults or other serious circumstances occur, the medium voltage breaker can be used to meet the

emergency. The medium voltage breaker provides the following functions:

1) After the medium voltage breaker is snapped off, the drive stops output, and blocks all output signals,

and the motor stops freely.

2) The medium voltage breaker can be used to break the medium voltage input of the drive. The medium

voltage breaker provides the self-locking function. After it is snapped off, the breaking state will persist

unless it is released manually.

When the drive, motor or driven load is abnormal, quick measures should be taken, and the user can snap off

the medium voltage breaker to cut off the medium voltage input source, and protect the equipment and

persons. Before performing maintenance or repair for the drive, be sure to set the medium voltage breaker to

the disconnected and locked state to ensure personal safety.

When the medium voltage breaker is snapped off during the operation, the motor will stop freely. In normal

circumstances, do not use the medium voltage breaker to shut down the system, but use the Decelerated

Stop button on the user interface or remote control instead. In the process of accelerated stop, the motor is

controlled by the drive, and can be restarted anytime.


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Operation interface

6.2.2 System Reset

The system resetting(pressing 0.5s) lets the whole control system of the drive return to the power -on default

state. In the operation of the drive, do not use the System Reset button in order to prevent system stop or

unexpected consequences.

The system resetting will make the flat panel computer powered on again. This is equivalent to the function of

the Reset button of the flat panel computer. However, after the user presses the Reset button of the flat panel

computer, the system performs self test and restarting, which takes a long time. Generally, do not use the

System Reset button on the cabinet door, but use the Reset button in the main interface, which provides all

functions of system resetting (except resetting of the flat panel computer).

6.2.3 Main Frequency Shift

An automatically shifting mains frequency bypass unit (vacuum contactor or breaker) is configured for the

system. The mains frequency shifting makes sense only if the user selects “Enable” in “Function Setting” ->

“System Bypass”.

Mains frequency shifting is used for the following purposes:

Soft start – This button is useful when one drive controls more than one motor, or serves only as

a soft start unit. After the motor is started normally, if the user presses this button, the

drive will track the frequency of the supply network automatically, and adjust the

variable-frequency output. When the two frequencies become consistent, the drive

will block output, send a mains frequency shift instruction, and control the electric


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shift interlocking circuit of the user, and the soft-started motor will shift from the drive

to the mains frequency supply network.

Drive maintenance – After the drive has operated for a period, routine inspection and maintenance should

be performed; or when the drive is slightly faulty or the unit operates through bypass,

the maintenance is required. During the operation of the motor, after the user presses

this button, the shift process is similar to soft start.

Shutdown due to major fault of drive – When the drive incurs a major fault and the unit cannot continue

operation through bypass, the system will cut off the medium

voltage input immediately, block the output, and send the mains

frequency shift instruction automatically. As a result, the motor will

shift from the variable-frequency circuit to the mains frequency

supply network compulsorily. In this case, the process is not

tracked, and the consistency of frequency is uncertain. This will

impact the motor and the supply network to some extent.

However, since the motor is still rotating at a high speed at this

time, the impact will be far less than the impact caused by direct

mains frequency startup of the motor.

6.2.4 Selection of Remote/Local Control

The user can select local control or remote control through a remote/local switch.

Selecting remote control

After the user flicks the remote/local switch to “Remote”, the user can control the drive on the industrial

site or in the centralized control room. In this case, the remote decelerated stop and the reset command

are effective, and the decelerated stop and free stop of the flat panel computer interface are ineffective.

The remote operators can use the remote decelerated stop button to shut down the system, and can

perform resetting and mains frequency shift.

Note: 1. In remote control, the external analog presetting is not necessarily effective. In order to make

the external analog presetting effective, it is necessary to select “Analog presetting” in the

function presetting mode of the flat panel computer.

2. In remote control, the medium voltage breaker is always effective. In any emergencies, the user

can cut off the medium voltage power supply through the medium voltage breaker, and make

the motor stop freely.

Selecting local control

If the user selects “Local” for the “remote/local” switch, the “Remote decelerated stop” button and the

“Mains frequency shift ” button will be ineffective, the “Software control” button in the flat panel computer

interface will be effective, and the user can the software interface of the flat panel computer to operate

the drive. After receiving the standby instruction, the interface operators can use the Start button in the

interface to start the system. When the drive operates under local control, the user can use the

“Decelerated stop” button and the “Free stop” button in the interface to shut down the system.


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Note: 1. In case of local control, the user can use the “Frequency presetting” button or the “External

analog presetting” button in the interface, as selected by the user in the “Function Setting”

interface of the flat panel computer.

2. Regardless of the state of the remote/local switch, the remote medium voltage breaker and all

switches and buttons on the cabinet door are effective.

6.3 Remote Control

Remote control can be performed in the control room, beside the motor, or on the industrial site of the load.

The layout of the optional operation box and operation box panel is shown in Figure 7.2. The remote

operation box provides the functions such as state display, control and adjustment presetting.

Standby indicator: Yellow. This indicator lights up when the system is standby. It means the system is

normal and ready for startup.

Run indicator: Green. This indicator lights up when the system is operat ing. If this indicator is

constantly on, it indicates the system operates normally; if this indicator is intermittently

on, it indicates the system is operating through bypass.

Fault indicator: Red. This indicator lights up when the system is faulty. When this indicator is constantly

on, a major fault occurs; when this indicator is intermittently on, a minor fault occurs.

6.4 Host Control

The AESMV-Y medium voltage drive series can be monitored by a host system. The drive is connected with

the host through RS485 cable. The communication protocol is MODBUS, and the maximum communication

distance is 1200m. One host can be connected to a maximum of 32 drives.

The optional host monitoring computer can monitor the state of the drive in real time. If the user selects

“Enable” for “Host parameter modification” of function setting, the user can modify certain parameters of the

drive through the host. If the computer presetting applies in this case, the user can also perform acceleration

and deceleration operations for the drive through the host. If the user selects “Enable” for “Host control” of

function setting, the user can perform shut down,accelerate or deaccelerate ot other actions through the host.

7. Operation

Before the variable speed drive drives the motor and the load, perform inspections and trial run properly to

ensure reliability and safety of operation. Use the vacuum breaker or the contactor to cut off the power supply

immediately in case a major fault occurs in the system in order to increase safety, prevent further spreading of

fault and reduce the damage.

After the drive is connected to the medium voltage power supply, do not contact any electric component in the

cabinet or perform any inspection. After the power supply is disconnected, do not contact the interior of the

unit until the power units have discharged electricity completely.


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7.1 Inspection Before Operation

After the drive is installed, inspect the drive carefully before powering it on, and eliminate the faults detected.

The check items are listed below:

1) Check whether the foot screws are installed firmly, whether the cables are laid smoothly in the cable

trough.

2) Check whether any circuit is connected incorrectly, especially the main circuit, and check whether the

grounding terminal is connected to the earth properly.

3) Check whether the control circuit adopts a shielded cable, and the shielding layer is grounded properly.

4) Check whether the optical connection is correct, loose or deformed.

5) Check whether the connection terminals and conductors are short-circuited in between or to the earth.

6) Check whether the screws and wiring terminals are connected firmly.

7) Check whether any conductor scrapings, screws or tools fall into the drive.

8) Check whether the cabinet body and the cabinet door are grounded firmly.

7.2 Supplying Control Power

1) Before supplying the control power supply, make sure that the 1-phase power switch on the drive is cut

off.

2) Supply the 220V control power.

3) Use a multimeter to check whether the front voltage of the supply switch is normal.

4) Turn on the power switch, and power on the PLC and the temperature controller of the t ransformer. 5

seconds later, power on the industrial computer. About 2 minutes later, the industrial computer is started

and initialized and enter the system monitoring interface.

5) Check the interface to see whether any fault alarm occurs and whether the communication is normal.

6) Check whether the temperature controller of the transformer cabinet displays normally.

7) Check the medium voltage breaker of the unit control cabinet to see whether it can be cut off normally.

Repeat this test for 5 times, and ensure that the breaker can be cut off anytime.

8) Select “Remote control” for the remote/local switch. Check whether the functions of remote control work

correctly.

9) If the analog setting function is in use, select “Analog setting” as the setting mode, and check whether the

analog set value of the frequency is displayed correctly.

10) Check whether function settings are consistent with the actual requirements.

11) Check whether the values set in “Parameter setting” are consistent with the actual operation conditions,

especially the important parameters such as reference voltage, reference frequency, rated current.


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12) Adjust the acceleration/deceleration time, torque elevation and current -limiting multiple according to the

features of the motor and load.

7.3 Supplying Medium Voltage Power

After all the foregoing preparatory work is finished, the medium voltage power can be supplied. Before

supplying the medium voltage power, no operator can stay near the cabinet body of the drive, and only two

operators can stay in front of the control cabinet to ensure breaking of the medium voltage in case of fault.

1) Release the medium voltage self-locking breaker on the control cabinet.

2) Check and make sure that no alarm or fault occurs on the drive.

3) Switch on the medium voltage breaker to power on the medium voltage drive.

4) Check whether any phase is lost, whether the fan runs normally, whether all power units are powered on,

and whether the indicators indicate normally. Check whether all state indicators on the control mainboard

in the control cabinet are in the normal indication state. After everything is normal, close all cabinet doors,

and use a piece of A4 paper to test whether all air inlets can absorb the paper onto the cabinet door. This

ensures smooth air ducts.

5) If everything is normal, the user interface displays normal monitoring.

6) Check the 3-phase waveform of the input voltage to see whether the waveform and voltage value are

correct.

7.4 Trial Run Without Motor

1) Select digital presetting of touch screen.

2) Select local control.

3) Select open-loop operation.

4) Set the frequency to 5Hz.

5) Start from user interface of touch screen.

6) Check whether output voltage is correct.

7) Increase the frequency by 5 Hz at a time until 50 Hz, and check the output.

8) Perform decelerated stop on the operation interface, and check whether the shutdown process is normal.

9) Set the frequency to 50Hz and restart, and check whether the system can be started to 50Hz normally.

10) Shut down the system.

7.5 Trial Run with Motor

1) Before operation, check whether the load is light, and whether the throttles and valves are closed.

2) Select local control.

3) Select digital presetting of touch screen.


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4) Select open-loop operation.

5) Set the frequency to 5 Hz.

6) Start from user interface of touch screen.

7) Check whether the rotation direction of the motor is correct. If it is not correct, shut down the system, cut

off the medium voltage power supply, adjust the main loop wiring, and supply the medium voltage power

again.

8) Check whether three phases are correct and balanced between the input voltage, input current, output

voltage, and output current.

9) Increase the frequency by 5 Hz at a time until 50 Hz, and check the input & output voltage/current.

10) In the acceleration process, check whether the motor or load is vibrating. If so, keep a record, and set a

skipping frequency after shutdown to avoid operation at the corresponding rotation speed.

11) Perform decelerated stop on the operation interface, and check whether the shutdown process is normal.

If it is not normal, adjust the deceleration time after shutdown.

12) Set the frequency to 50 Hz and restart, and check whether the system can be started to 50 Hz normally.

If not, adjust the acceleration time after shutdown.


14) Adjust the function settings according to the actual operation conditions, e.g., control mode (local control,

remote control, host control), presetting mode (digital presetting, analog voltage presetting, analog

current presetting), and operation mode (open-loop operation, closed-loop operation).

15) In case of closed-loop operation, adjust the proportion factor and integral factor (generally exclusive of

differential factor) according to the actual operation conditions to ensure stable closed-loop operation.

7.6 Operation Procedure

After the trial run, operate the drive in the following procedure:

1) Power on the drive.

2) Check the device and make sure it operates normally.

3) Turn on the power switch, and the 220V control power supply is applied to the system.

4) After the system is started, the displayed state is normal, and no fault alarms occur. The system is in the

normal operable state. If any alarm occurs, discern the causes, take measures to eliminate the fault, and

press the Reset button on the screen to recover the system.

5) Check “Function” setting, and make sure all settings are correct, and then click <OK> to exit.

6) Make sure that all parameters are set properly, including reference voltage, reference frequency, torque

elevation, acceleration time, and deceleration time, and click <OK> to exit.

7) Switch on the medium voltage breaker, and power on the drive.

8) Start the motor, and set the frequency as required.


63

9) In the process of free stop, the motor cannot be restarted until it stops steadily; in decelerated stop, the

motor can be restarted in the process of shutdown.

10) During the operation, the user can select “Interface locking” in the function items to prevent misoperation

of unauthorized persons.


12) If any exception occurs in the operation, snap of f the “medium voltage breaker” on the cabinet door to cut

off the lead-in medium voltage breaker.

13) To shut down the system in normal circumstances, press the “Decelerated stop” button or the “Free stop”

button on the screen.

14) After shutdown, cut off the lead-in medium voltage breaker.

15) In 10 minutes after the medium voltage is broken, after the power unit discharges electricity completely,

select “Shut down computer” from the “Exit” button, and then cut off the control power supply. Do not cut

off the control power supply when the medium voltage is on or before the power unit indicator goes out.

8. Troubleshooting and Maintenance

8.1 Categories and Minor Faults and Alarms

The following faults in the system are treated as minor faults:

Cabinet interlocking fault, flat panel computer fault.

The fault indicator blinks when any fault occurs. The system does not memorize the minor faults, but displays

them in “Current state” of the main interface. An alarm is raised when a fault exists, and is cleared

automatically after the fault is eliminated. If this type of fault occurs during the system operation, the drive

does not stop.

8.2 Categories of Major Faults and Alarms

The following faults in the system are treated as major faults:

Bypass of unit, overload of motor, overcurrent of drive, transformer tripped for overheat, site tripped off,

overcurrent of motor, disconnection of feedback current signal during closed-loop operation.

Once any of the above faults occurs, the system will raise alarm and fault indication, and send a medium

voltage breaking instruction. The system will memorize occurrence of the foregoing major faults. Once the

fault occurs, the system raises an alarm, trips off automatically and records the causes for the fault. If the fault

disappears automatically, the fault indication and the medium voltage breaking instruction will remain. The

drive returns to the system standby state only after the fault is eliminated thoroughly and the user presses the

Reset button in the main interface. After this, the system can be restarted.

When a major fault occurs, the medium voltage power supply will be cut off automatically. If the medium

voltage power supply is not cut off due to exceptions, the user can cut off it through the medium voltage

breaker on the cabinet door.


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8.3 Troubleshooting

This drive is highly intelligent and contains perfect fault detection circuits. All faults can be located precisely

and displayed on the flat panel computer explicitly. The user can take proper measures according to the fault

information displayed on the flat panel computer.

1) Cabinet door opened illegally: This fault alarm occurs when the cabinet door of the transformer cabinet or

the unit control cabinet is opened. Check whether the cabinet door is closed tightly, whether the posit ion

switch is sound, and whether the wires are detached.

2) Drive unable to start: The drive can start up in the system standby state. If the drive cannot start up,

check whether the foregoing conditions are readily available.

Besides, in order to facilitate the users and increase flexibility of operation, the AESMV drive series provide

three startup modes. If the setting is improper, the startup will fail. The possible startup modes that forbid

manual startup of the user include:

1) Local control: The system is started up through the operation interface. This button is effective only if the

user selects “Local” for the “Local/switch” switch. If the system cannot start through the operation

interface, check the selection switch.

2) Remote control: The system is started up through the remote control contact. This button is effective only

if the user selects “Remote” for the “Local/switch” switch. If the system cannot start remotely, check the

selection switch and the remote contact.

3) Host control: The system is started through the host. The host control is unrelated to the local/remote

switch, but decided by the function item “Host control” in the main interface. If the user selects “Enable”

for this function item, the system will be started through the host. If the host fails in controlling the startup

of the system, check whether this function item is enabled.

4) DC bus undervoltage of the unit: Check whether the input medium voltage power supply is lower than the

minimum allowed value, whether the medium voltage breaker is tripped off, and whether the secondary

side of the rectification transformer is short-circuited. Check whether 3-phase lead-in wires of the power

unit are loose, and whether the 3-phase lead-in fuse of the power unit is sound.

5) DC bus overvoltage of the unit: Check whether input medium voltage power supply exceeds the

maximum allowed value. If the overvoltage occurs during deceleration, increase the deceleration time of

the drive properly.

6) Fuse fault of the unit: Check whether the 3-phase lead-in wires of the power unit are loose, and whether

the lead-in fuse is sound.

7) Transformer overheat alarm: The node is closed when the isolation transformer is slightly overheated.

Check whether the secondary side wires of the transformer are well isolated or short -circuited, whether

the system is overloaded, whether the ambient temperature is too high, whether the cooling fan of the

transformer is normal, whether the air ducts are smooth, whether the temperature controller works

normally, whether the overheat alarm parameter of the temperature controller is set properly, and

whether the parameter is reset or modified illegally. The default overheat alarm temperature of the

transformer is 130°C.


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8) Transformer tripped for overheat: The node is closed when the isolation trans former is seriously

overheated. Check whether the secondary side wires of the transformer are well isolated or

short-circuited, whether the unit is overloaded, whether the ambient temperature is too high, whether the

cooling fan of the transformer is normal, whether the air ducts are smooth, whether the temperature

controller works normally, whether the overheat protection parameter of the temperature controller is set

properly, and whether the parameter is reset or modified illegally. The default overheat protection

temperature of the transformer is 150°C.

9) Overheat of unit: Check whether the ambient temperature exceeds the allowed value, whether the fan of

the power unit cabinet works normally, whether the air inlet and the air outlet are smooth, and whethe r

the unit is overloaded for a long time. Finally, check whether the temperature switch of the power unit is

normal.

10) Overcurrent of motor: Check whether the motor or the load is mechanically blocked, whether the winding

or insulation layer of the cable is damaged, whether the supply voltage is too low.

11) Optical communication fault of unit: Check whether the control power supply of the power unit is normal,

whether the fiber connector of the power unit and the control mainboard are detached, whether the fiber

is deformed or broken.

12) IGBT fault of unit: Check whether the output L1 and L2 terminals of the power unit are short -circuited,

whether the insulation layer of the motor is sound, whether the unit is overloaded, whether the load is

mechanically faulty.

13) Bypass of unit (bypass operation and bypass standby): When some power units incur fuse fault,

overheat or IGBT fault, this system will bypass the unit. When unit bypass occurs during the operation,

the drive can operate in a derated mode without shutdown. In case the unit bypass occurs in the

shutdown state, the drive can restart and resume the bypass operation. During the bypass operation, the

bypass indicator of the power unit is on. If the bypass operation of the unit cannot reach the rated

operation state, it is necessary to ascertain the causes for the unit fault, eliminate the fault, or replace the

power unit, and recover the drive.

8.4 Replacing Power Unit

If a unit cannot work due to faults, substitute a spare unit for the faulty unit when the device is shut down as

permitted. The replacement procedure is as follows:

1) Shut down the system, and let the drive exit the operation state.

2) Cut off the medium voltage power supply, and lock the medium voltage breaker.

3) Open the door of the unit cabinet, and wait until all indicators of the unit go out.

4) Unplug the TX and RX fiber connectors of the faulty unit.

5) Use a spanner to remove the R, S and T input power supply wires and the L1 and L2 output connection

copper bar of the faulty unit.

6) Remove the two fasteners between the faulty unit and the rail, and unplug the faulty unit along the rail.

7) Load the spare unit in the sequence opposite to the foregoing removal sequence, connect the wires, and

power on the system to put it into service.


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8.5 Maintenance

The AESMV medium voltage drive takes personal safety into account sufficiently during the design and

manufacturing. The internal connections of the drive, which is a medium voltage device, still bear critical

voltages. Moreover, the radiators and many other components are hot, and cannot be touched. Therefore,

read the following warnings before operating and maintaining the drive:

1) Observe the operation procedure strictly before performing any maintenance or repair work.

2) The electrostatic must be eliminated before approaching or touching the components in this way: Wear a

grounded antistatic wrist strap, and this wrist strap is grounded to the earth through a 1MΩ resistor. By

touching the grounded metal, the electrostatic is eliminated.

3) Do not cut off the control power supply during the operation of the drive because this will damage the

power unit.

4) Do not touch any part in the cabinet before you make sure that no component is hot and live.

5) Always operate with a single hand, wear safety protection shoes, and be accompanied by co-workers.

6) Do not connect or disconnect any meters, cables, communication fibers or circuit boards with power on.

7) When overhauling or replacing a power unit, cut off the medium voltage and make the lower side of the

breaker grounded firmly before opening the medium voltage cabinet door. Make sure that all unit

indicators are off before touching the power unit.

8) Do not send the medium voltage input to the output side of the drive mistakenly, which will damage the

drive seriously.

9) Do not measure the resistance of the output insulation layer of the drive with a medium voltage

megameter because this will damage the switch components in the power unit.

Daily maintenance and inspection for the drive:

1) Inspect the indoor temperature and ventilation regularly, and keep the room temperature below 40°C.

2) Keep clean indoors.

3) Check the drive regularly for abnormal sound and smell, heat of the cabinet body, and smell at the air

outlet.

4) Check the air inlet volume of the transformer cabinet and the power unit cabinet regularly with a piece of

A4 paper to see whether the paper is sucked by the filter firmly. Remove the fault timely if any (check

whether the cooling fan runs normally, replace or clean the filter).

5) In one month before the drive is put into operation, tighten all incoming and outgoing cables of the

transformer, power unit and control cabinet. Then tighten the cables semiyearly. Use a vacuum cleaner to

remove the dust in the cabinet.

6) Record the operation of the drive periodically. In case the breaker is tripped off by a fault, record the fault

information, ascertain the causes, and eliminate the fault before powering on the device again.

Periodical maintenance of drive:


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1) It is recommended to maintain the drive semiyearly. The filter can be replaced on a monthly basis if much

dust is generated.

2) Maintenance work includes cleaning of filter, transformer cabinet, and unit control cabinet; and tightening

of the wiring terminals of the transformer and the power unit.

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