universal electric motor protection device (numeric relay) ubz...

“NOVATEK-ELECTRO” RESEARCH AND MANUFACTURING COMPANY

UNIVERSAL ELECTRIC MOTOR PROTECTION DEVICE

(NUMERIC RELAY)

UBZ-304

OPERATION MANUAL

WWW.NOVATEK-ELECTRO.COM/EN

http://www.novatek-electro.com/EN

CONTENTS

1. DESCRIPTION AND OPERATION .................................................................................................................. 3

1.1 APPLICATION ................................................................................................................................................. 3

1.2 TECHNICAL BRIEF ......................................................................................................................................... 4

1.2.1 Principal technical parameters are given in table 1.3 .................................................................................. 4

1.2.2 Measured and calculated parameters ......................................................................................................... 5

1.2.3 Programmable parameters ........................................................................................................................... 7

1.2.4 Operating controls and dimensions of the UBZ device ........................................................................... 11

1.2.5 Protection functions .................................................................................................................................. 12

1.2.5.1 Types of protection ............................................................................................................................ 12

1.2.5.2 The maximum phase current protection ............................................................................................. 12

1.2.5.3 Earth fault protection ......................................................................................................................... 13

1.2.5.4 The negative sequence (imbalance) protection ................................................................................. 13

1.2.5.5 Minimum phase current protection .................................................................................................... 14

1.2.5.6 Delayed start, rotor lock-up................................................................................................................ 14

1.2.5.7 Thermal overload protection .............................................................................................................. 14

1.2.5.8 Winding overheat protection .............................................................................................................. 15

1.2.6.9 Voltage based protection .................................................................................................................... 16

1.2.5.10 Protection based on phase sequence ............................................................................................... 16

1.2.5.11 Protection based on mains frequency reduction............................................................................... 16

1.2.5.12 Minimum resistance protection of motor winding insulation .......................................................... 16

1.2.5.13 Motor protection against phase (phases) loss (missing) .................................................................. 16

1.3 PRODUCT PACKAGE CONTENTS ............................................................................................................. 16

1.4 EQUIPMENT FEATURES AND OPERATION ............................................................................................ 17

2. PROPER USE .................................................................................................................................................... 17

2.1. SAFETY .......................................................................................................................................................... 17

2.2 UBZ UNIT CONTROL ................................................................................................................................... 17

2.3 PREPARING UBZ FOR OPERATION .......................................................................................................... 20

2.4 PROPER USE .................................................................................................................................................. 21

2.4.1 UBZ operation before load relay closure .................................................................................................. 21

2.4.2 The device operation after load relay closure and motor start ................................................................. 22

2.4.3 Characterizing relay operation .................................................................................................................. 22

2.4.4 Work with RS-485 interface under MODBUS protocol in the RTU mode .............................................. 22

2.4.5 Fault conditions system ............................................................................................................................. 28

2.4.6 Faulty conditions log ................................................................................................................................. 29

2.4.7 Motor control with use of UBZ front panel .............................................................................................. 30

3. MAINTENANCE .............................................................................................................................................. 30

4. TRANSPORTATION AND STORAGE ........................................................................................................... 30

5. PERIOD OF SERVICE AND STORAGE; MANUFACTURER’S WARRANTY ......................................... 30

6. ACCEPTANCE CERTIFICATE ....................................................................................................................... 31

The universal induction motor protection device UBZ-304, SERIAL # ____________________

was manufactured and accepted in accordance with the compulsory requirements of state stan-

dards and of the effective technical regulative documentation and is declared fit for the original

purpose. .............................................................................................. 31

Appendix 1. Dependent time delay current based protection types ....................................................................... 32

Appendix 2. UBZ motor control operation with the star-delta winding switching ............................................... 34

1. DESCRIPTION AND OPERATION

1.1 APPLICATION

1.1.1 The UBZ-304 universal electric motor protection device (the – UBZ) is designed for protection of

asynchronous motors with the power of 2.5 to 315 kW, in case of the use of external standard current transform-

ers with the output current of 1 ampere or 5 amperes, to include in the power mains with an isolated neural ter-

minals.

The UBZ device provides continuous monitoring of the mains voltage parameters and RMS phase/line cur-

rents of the three-phase electric equipment of 380V-415V 50Hz, as well as for the motor insulation resistance

test.

The UBZ unit provides for electric motor protection in the following cases:

- when the mains voltage is of poor quality – voltage fluctuations & surges, phase loss (single phasing),

wrong phase sequence and phase "coincidence" (short circuits), phase/line voltage imbalance;

- when mechanical overloads/symmetrical phase/line current overloads occur;

- when reverse sequence of the current threshold occurs;

- when phase current imbalance (without overload) occurs that is induced by the insulation fault inside

the motor and/or the lead cable (current imbalance factor compared to voltage imbalance factor based on nega-

tive sequence);

- when motor torque is lost ("dry stroke" for pumps). The unit provides protection based on the minimum

start and/or operating current;

- when start delay or rotor obstruction occur;

- insulation level between the fixed coil and frame is abnormally low (insulation resistance test before

motor start-up);

- when stator winding ground fault takes place during operation, the UBZ unit activates ground leakage

current protection;

- when motor heat overload takes place;

- when winding overheating occurs (winding temperature measured by integrated temperature sensors, or

frame temperature measured by external temperature sensors).

For each type of protection, it is possible to permit and prohibit the load automatic reset (hereinafter men-

tioned as AR).

The unit provides for electric equipment protection by means of a magnetic starter (contactor) coil control.

The unit determines load currents when the load relay is open with the open load and characterizing relays in

the star-delta mode). In this case, the unit shall indicate the fault of an external contactor, which is starting the

motor until unit deactivation.

Communication

- control and parameters transfer via RS-485 interface according to MODBUS protocol;

- control and parameters transfer via RS-232 interface.

Note. RS-485 and RS-232 cannot be used simultaneously.

Interaction of PC and UBZ is possible via “UBZ-304 Control Panel” Software that can be downloaded

from the “Novatek-Electro” website.

UBZ-304 Control Panel software is dedicated for monitoring the status and retrieving data from UBZ de-

vice via communication interface (RS-232 or RS-485). The application allows for saving (loading) various UBZ

settings, retrieving data and saving them for further study. The saved data can be viewed on a graph while com-

paring parameters.

The CP graphic environment allows for real-time viewing the current status of various UBZ parameters.

The flexible interface design allows tuning it to any user’s preferences.

1.1.2 Changes in UBZ specifications and operation depending on the firmware version.

1.1.3 UBZ application limitations and proper selection of parameters.

In case of tested standard transformer samples, the core saturation took place at 4-5 times the rated current

value. Therefore, to provide for proper functioning of UBZ protections, one should select transformers with rat-

ed current value exceeding the rated load currents twice and more, or choose parameters’ values while consider-

ing the saturation.

1.1.4 Internal relays output terminals specification

The internal relays output terminals specification is outlined in Table 1.1 and Table 1.2.

Load Relay

Table 1.1

Max. cur-

rent for

U~ 250V

Number of trips

х1000 Max switching

power

Max sustained safe

voltage

Max. current for U

= 30V

# trips

Cos = 0.4

Cos = 1.0

2 А

5 А

100

100 1000 VA 460 V 3 А (50000)

Characterizing relay

Table 1.2

Max. cur-

rent for

U~ 250V

Number of trips

х1000

Max switching

power Max sustained safe

AC/DC voltage

Max. current for U

= 30V

Cos = 0.4

Cos = 1.0

5 А

16 А

100

100 4000 VA 440/300 V 3 А

1.1.5 List of abbreviations

AR – Automatic Reset

MС – Magnetic Contactor

PC – Personal Computer

CT – Current Transformer

LCD – Liquid-Crystal Display

MMSP – Mode with Minimal Number of Setting Parameters

Itt – CT rated current (Specified when external CTs are used. E.g. if CT is of type Т-0.66 300/5, the Itt will

be equal to 300А)

In – rated current of motor. As a rule, this is the current value shown on the motor plate, but subject to spe-

cific operating conditions, a different current value may be set.

1.2 TECHNICAL BRIEF

1.2.1 Principal technical parameters are given in table 1.3

Principal Technical Brief

Table 1.3

Nominal supply voltage: Three-phase 50Hz, V 380 - 415

Mains frequency, Hz 48-62

CT Rated Current 1A, 5A

Voltage hysteresis, (phase/line), V 10/17

Heat hysteresis, % of stored-up heat at shutdown 33

Trip threshold accuracy for current, ≤ % of nominal current 2

Trip threshold accuracy for voltage, ≤ V 3

Phase imbalance detection accuracy for voltage, ≤ V 3

Minimum functional voltage:

-one-phase voltage, and cOnected neutral main, ≥ V

-line voltage, three phase ≤ , V

180

450

Analog inputs:

- two analog inputs for temperature sensors cOnection (types: Pt100, Ni100,Ni120)

- analog input for cOnecting sensor with 0-10V output

- analog input for cOnecting sensor with 4mА (0mА) – 20mА output

- three analog inputs for cOnecting standard CT with 5 (1) A output (of Т-0.66 type or simi-

lar)

- input for cOnecting a differential current transformer (zero sequence transformer)

Main outputs

load relay – two groups of changeover contacts for motor starter control -5A 250V at cos

φ=1;

programmable relay - one group of changeover contacts - 16A 250V at cos φ=1 (the relay

function is assigned by the user);

Temperature sensors resolution, °C 1

Power consumption (under load) ≤ VA 5.0

Enclosure rating: - apparatus

- terminal box

IP40

IP20

Climate zone version У3.1

Operating temperature range, °C -35 - +55

Storage temperature, °C -45 - +70

0.5

Case dimensions (diagram 1.1) nine S-type modules

Case dimensions (figure 1.1)

Mounting - onto a standard 35 mm DIN-rail

Mounting position - arbitrary

1.2.2 Measured and calculated parameters

Measured and calculated parameters output to the display unit*, their effective range limits and toleranc-

es are given below in Table 1.4.

*Note: The display unit is represented by:

- LCD on the device’s front panel;

- PC, cOnected to one of the UBZ interfaces (MODBUS, RS-232).

Measured and indicated parameters

Table 1.4. Controlled functions Range Accuracy Mnemonic Address Measurement

units used at

data transfer

Currents 1/10 of an am-

pere4

Phase currents RMS values, A 0.5-630 2% Phase i1

Phase i2

Phase i3

100,101,

102

Actual zero sequence current values, A 0.3-20.0 2% Earth i0 103

Each phase average current value at time speci-

fied in tSi parameter

Average

i1

Average

i2

Average

i3

104,105,

106

Мах each phase average current value obtained

since last power on.

All average values can be reset with

ЗАП/СБР/ВЫБ (RECORD/RESET/SELECT)

button at time of max average current value out-

put for any phase (real-time average current value

for corresponding phase is assigned)

<3 Itt

> 3 Itt

2%

10%

Peak i1

Peak i2

Peak i3

107,108,

109

Motor start current (phase average)

Overload current (phase average)

Start time, sec

Start time is the period of time from the moment

when three phase currents exceed 1,2 In and up to

the moment when the three currents drop below

1,2 In. Max phase current achieved during this

period is the max start current.

<3 Itt

> 3 Itt

0.1-600

2%

10%

Start i

Overload i

Start time

110

112

111

Negative current sequence (current imbalance), A 0.2-200 5% Revers sI 113

Voltages Volts

Actual phase voltages values (defined by

cOnecting zero wire to the UBZ), V

100-300 3 V Phase U1

Phase U2

Phase U3

114,115

116

Line voltage effective values, V 100-475 5 V Line U1

Line U2

Line U3

117,118

119

Positive-sequence voltage, V 100-300 3 V Positive

sU

120

Negative-sequence voltage, V 3-300 3 V Revers sU 121

Zero-sequence voltage (vector sum of three phase

voltages, divided by three), (defined when zero

wire is cOnected to UBZ), V

3-100 3 V Zero sU 122

Miscellaneous Sensor 1 temperature (sensor type is specified

according to table 1.5), °C*

minus 40 - 220 1°C Tempera-

ture

Dat 1

123 5000-sensor is

off:

1000±10– sen-

sor short circuit

2000±10– sen-

sor circuit open

Sensor 2 temperature (sensor type is specified

according to table 1.5), °C*

minus 40 - 220 1°C Tempera-

ture

Dat 2

124

Current input value (4-20 mA), mA 0-25 2% Input i 125 1/100 of a

milliampere

Analog input voltage value (0-10 V), V 0-10 2% Input U 126 1/10 volt

Equipment operation time counter, days 0-999 Time

mash

128

Mains frequency, Hz 45-65 1% Frequncy 129 1/10 Hz

Motor insulation resistance, MOhm ** 0-19.9 10% insulation 129 100s kOhm

Operation time before overload de-energizing

(indicates time left before safety system triggers

heat overload de-energizing), sec

0-600 1 sec Before

OvL

130 seconds

Time before AR delay termination, sec *** 0-900 1 sec End of AR 131 seconds

Wait time after overload de-energizing (indicates

wait time before permit of system restart after

thermal overload de-energizing), sec ****

0-900 1 sec After OvL 132 seconds

Motor thermal balance

Read-only parameter via interface RS-232, RS-

485

Number 1100000 corresponds to 100% of accu-

mulated heat which initiates motor cutoff when

thermal overload protection is on (par.1.2.5.7).

133, 134

Gross power, KVA***** 0-5000 5% Full power 135, 136 W * 10

Active power, KW***** 0-5000 5% Active P 137, 138

Reactive power, KVAr***** 0-5000 5% Reactive P 139, 140

Phase А voltage/current angle cosine *1000 0-1000 5% Cos A 141, 142

Phase B voltage/current angle cosine *1000 0-1000 5% Cos B 143,144

Phase C voltage/current angle cosine *1000 0-1000 5% Cos C 145,146

* Note. If temperature value exceeds specified limit, the value indicator displays error code according to Table

2.8. If the corresponding thermal sensor is turned off by the programmed control, the indicator shows “OFF”

instead of the temperature value.

** Note. If motor resistance exceeds 20MOhm, then the value indicator displays “>20Mom “ .

When motor is started (when the power supply voltage is transferred to the engine) the insulation re-

sistance is not defined and “---“ code is displayed (with the cOnected measurement circuit of the insulation mo-

tor).

*** Note. If AR is prohibited, the indicator displays “prohibited”.

**** Note. If time before thermal overload safety de-energizing or wait time before system start permit (ttP) has

not been defined, “undef“ code is displayed. In case protection operation is forbidden, “prohibited” message is

displayed.

***** Note. While working with measuring transformers of rated current over 100A, the currents (measured and

calculated), except for the zero sequence current (ground fault) are transferred via RS-232/RS485 interface in

amperes.

1.2.3 Programmable parameters

Programmable parameters and their variability ranges are shown below in table 1.5.

Programmable parameters

Table 1.5. Settings and read-off pa-

rameters

Code parameters Min

value

Max

value

Factory

setting

Operation Address

Transformers

Rated output current of

theused CT

CT out i 1 5 5 150

CT rated current, A CT nom i 20 800 100 For external CT 151

Basic parameters

Motor rated current, A Rated In 0 630 0 0 – current is not established: UBZ will

not enable load relay (par.2.3.7).

152

Time within which average

current value is measured,

sec

Tm average i 10 600 60 Time within which average current value

is measured (parameters iS1, iS2, iS3

from Table 1.4)

153

Maximum current protection

Maximum current protec-

tion type

Type

Imax

indep indep -protection with independent time

delay

Types of protection with dependent time

delay: SIT; VIT (LTI); EIT; UIT; RI

154

Max current protection trip-

ping setting value, ratio

Imax coef 0.8 9.0 4.0 ratio is set against the rated motor cur-

rent

(active if i =

P = 0).

155

Current protection tripping

delay, sec

Imax delay 0.3 600 10.0 156

Thermal overload protection

function permission

Imax protec On AR Off - protection function prohibited,

Onn AR - protection function allowed;

AR after tripping is prohibited.

On AR - protection function allowed;

AR after tripping is allowed.

157

Current protection tripping

order as related to heat over-

load protection

Imax<>T 0 1 1 0- protection trips independently of the

heat overload protection

1-when the heat triggered restart has not

been activated, the load relay is not de-

energized

158

Ground fault protection (based on zero sequence current, iF0)

Current fault tripping set-

ting, A

I earth tresh 0.3 5.0 0.5 If the parameter is not included in the

MMSP list, then the default value is:

0,5 if In<=50A;

1,0 if In>50A

159

Protection tripping delay,

sec

I earth delay 0.3 2.0 1.0 160


function permission

Iearth

protec

On AR Off - protection function prohibited,





161

Negative-sequence current protection

Tripping setting, % I2 rev

tresh

5 20 10 Set in percentage of rated current 162

Settings and read-off pa-

rameters

Code parameters Min

value

Max

value

Factory

setting

Operation Address


sec

I2 rev delay 0.3 10.0 5.0 163


function permission

I2 rev

protec






164

Analysis of causes for negative-sequence current protection tripping.

Excess rate of current

negative sequence ratio

relative to voltage negative

sequence ratio

A-s I2 coef 2 4 2 165

Analysis function permis-

sion

A-s I2

prot

On Off - analysis off

On - analysis on

166

Thermal overload (motor thermal model)


function permission Termal OL prot On AR Off - protection function prohibited,





167

Double current overload

protection tripping time, sec

Termal

delay

10 120 60 168

Time increase ratio while

motor is stopped

Termal

C. stop

1.0 4.0 1.0 Cooling time increase compensation

while motor is stopped

169

Minimum phase current

Tripping setting, % Imin

tresh

11 90 20 Minimum working current tripping

threshold, % of rated current

170


sec

Imin delay 1 100 5 171

Protection function permis-

sion

Imin protec On AR Off - protection function prohibited,





172

Delayed start, rotor lock-up

Tripping setting, ratio Start I Coef. 1.3 7.0 5.0 Ratio relative to rated current is assigned 173

Tripping delay of long last-

ing start protection, sec

Start I

Delay

1 600 10 Time of motor startup 174

Tripping delay of long rotor

blocking protection, sec

Block I delay 0.3 300 1.0 175


sion

St/Block

prot






176

Voltage protection

Minimum line voltage, V Umin

tresh

270

415

320

177

Minimum voltage de-

energize tripping delay

time, sec

Umin

delay

5 30 10 178


sion with the minimum

voltage

Umin

protec






179

Maximum line voltage, V Umax

tresh

330

475

415

180

Max line voltage de-


time, sec

Umax

delay

1 10 2 181


sion with the maximum line

voltage

Umax

protec





182


rameters

Code parameters Min

value

Max

value

Factory

setting

Operation Address


Line voltage imbalance, V Uimbal

tresh

15 120 35 183

Line voltage imbalance de-


time, sec

Uimbal

delay

1 30 5 184

Line voltage imbalance pro-

tection function permission

Uimbal

protec






185


sion in order of phase se-

quence

Ucorrect phase On AR Off - protection function prohibited,





186

Motor phase (phases) loss with current control

Phase (phases) loss protec-

tion tripping delay, sec

Phase LossT 0.3 10 0.5 219


sion

PhaseLoss

Prot






220

Power frequency-based protection

Min value of voltage fre-

quency, Hz

Frequncy Min 35.0 60.0 48.0 187

Delay tripping upon mini-

mum frequency voltage, sec

FreqMin

delay

1 300 10 188


sion with the minimum line

frequency

FreqMin

prot






189

Motor operation and automatic reset control

Automatic reset (AR) time

after minimum current pro-

tection tripping, sec

AR time

Imin

0 900 600 187

Automatic reset (AR) time,

sec

AR time 0 900 5 188

Запрет АПВ для всех

аварий (кроме аварий по

напряжению)

AR Off-AR prohibited

On-AR permitted

Arr parameter value is true for all types

of faults, except the voltage faults. To

prohibit AR at voltage faults, it is neces-

sary to use the following parameters U=r

, U=r, Uпr.

189

Motor operation permitted

after UBZ device power-on

Start>power Sta>AR StaOff – manual motor start from UBZ

front panel

Sta>AR - motor restart after AR delay

time

Sta>2s - motor restart after 2 sec

190

Motor control with use of

UBZ-304 front panel

MotorOp

UBZ

Off Off - prohibited

Start - motor start permitted

Stop – motor emergency stop permitted

St<> - motor startup and stall permitted

See ref. 2.4.7

191

Remotely controlled motor

start and stop via RS-

232/RS485 interface

MotorOp

RS-2/5

Off – remote control prohibited

OnSta - remote control permitted, motor

start after UBZ device power-on permit-

ted

OffSta - remote control permitted, motor

start after UBZ device power-on prohib-

ited until remote start command has been

issued

221


rameters

Code parameters Min

value

Max

value

Factory

setting

Operation Address

Temperature control

Permission of temperature

control and type of the tem-

perature sensor 1

Temp S1

Type

0 – disabled

1 – TS, integrated into the motor (protec-

tion trips if the sensor resistance exceeds

1.7 kOhm)

2 – PTC type TS (1kOhm at 25°С)

192

Motor stop temperature, °С Temp S1

Off M

0 100 80 193

Temperature compensation

of the first sensor

Temp S1

Corr

-9 9 0 194

Permission of temperature

control and type of the tem-

perature sensor 2

Temp S2

Type

0 – disabled

1 – Pt100 type TS

2 – Ni100 type TS

3 – Ni120 type TS

195

Motor stop temperature Temp S2

Off M

0 220 180 196

Warning temperature Temp S2

Alarm

0 220 170 197

Temperature compensation

of the second sensor

Temp S2

Corr

-9 9 0 198

AR after protection tripping Temp AR Off – AR after tripping is prohibited

On – AR after tripping is permitted

199

Reaction to temperature

sensors failure

Temp sens fault AonM

AoffM

0 - warning message, operation contin-

ued;

1 - warning message, motor stopped.

200

Motor insulation resistance

Min motor insulation re-

sistance protection

Isolation m-r 5 AR Off -disabled

5 - AR-motor will not start when insula-

tion resistance is < 500k, AR permitted;

10 AR10-motor will not start when insu-

lation resistance is < 1000k, AR permit-

ted;

5 nAR - motor will not start when insu-

lation resistance is < 500k, AR prohibit-

ed;

10 nAR- motor will not start when insu-

lation resistance is < 1000k, AR prohib-

ited.

236

MISCELLANEOUS

Min number of setting pa-

rameters mode enable

Minimal set On Off -mode disabled

On - mode enabled

The mode change is enabled in the ser-

vice-engineer mode only

202

Indication on UBZ display

panel before motor energize

Indicat <Start Line U Line U - line voltage U1,U2,U3

IsoAR - insulation resistance and AR

time countdown

203

Parameter indication mode indicat mode Conti Conti - parameter value indicated con-

tinuously

>15s - parameter value indicated within

15 sec

204

Characterizing relay opera-

tion mode

Relay F

mode

Alarm Alarm – relay is used as an alarm relay

Timer – relay is used as a time relay

(enabled after the time, set by the pa-

rameter “Relay F time” after enabling

the load relay)

St->D – relay is used for switching the

motor – star-delta (after the time of “Re-

lay F time” (address-206) the load relay

is disabled, and after the time “Relay F

time”(address-206) + “ST>DELTA

TIME”(address-218) the characterizing

relay is enabled).

205

Timer time, sec Relay F

time

0 300 30 see. par. 2 , par. 3 of the parameter “Re-

lay F mode” (address-205)

206


rameters

Code parameters Min

value

Max

value

Factory

setting

Operation Address

Star-delta mode. Switching

time, sec

ST>DELTA

TIME

0.1 2.0 0.4 Time between disabling the load relay

and enabling the characterizing relay in

the star-delta mode

218

Equipment operation time

counter, days

Time UBZ-304 0

999

0

*when MODBUS/RS-232 interface data

transfer is utilized, the operation time is

transferred in hours

207

Motor operation time, days Time motor 0

999

0

*when MODBUS/RS-232 interface data

transfer is utilized, the operation time is

transferred in hours

208

User access code Users code 0 9 0 0 – keyboard unlocked

1-9 – user password

209

Service engineer access

code

Password 000 999 123 000-access to service engineer level -

permitted

000-999 – service engineer password

210

System reset to factory set-

tings

Default Factor Off After value SET has been recorded and

parameter setup mode exited, the factory

set parameters will be restored

211

Параметры последовательного интерфейса (RS-485/ RS-232)

UBZ communication ad-

dress

Address UBZ-304 1 247 1 212

Transmission rate Data speed 9.6 k

19.2k

9.6 k: 9600 baud; 19.2k: 19200 baud;

Transmission rate change will occur only

after discOnection and repeated

cOnection of power supply

213

Response of converter to

cOnection loss

Loss cOnect non non - continue without warning

alarm – warning message and operation

continued;

AlStAR - warning message and motor

stopped with permission of AR after

restoring cOnection

AlStnA - warning message and motor

stopped with profibiting AR after restor-

ing cOnection

214

Discovery of response time

delay, sec

Overexceeding 0 120 0 0-prohibited 215

Permission of serial line

UBZ cOnection

cOnection Off

Off – cOnection prohibited

RS-232 – cOnection through RS-232

RS-485 – cOnection through MODBUS*

216

Device version Version 5 Parameter value depends on the used

version of software

217

1.2.4 Operating controls and dimensions of the UBZ device

Operating controls and dimensions of the UBZ device are shown in fig.1.1.

1 – LCD

2- green LED MMSP – glows, when the relay is in the MMSP mode; red LED УСТАНОВКА – glows, when the relay is in

the parameter setup mode

3 – green LED FUNC RELAY – glows, when the characterizing relay is on

4 – green LED З/Т – glows, when the UBZ characterizing relay operates in the star-delta mode (par.2.4.3)

5 – blue LED EXCHANGE – glows during data exchange with PC

6 – red LED FAULT:

- when the load relay is off: glows, when UBZ is in the fault condition (blinks, if AR is possible after fault);

- when the load relay is on: blinks, when the motor is in the maximum voltage or overheating overload condition, but the

relay disabling time has not come yet

7 – green LED TR – glows, when UBZ characterizing relay operates in the time relay mode

8 – green LED POWER RELAY – glows, when the load relay is on

9 – red LED SETUP (parameter setup mode indication)

10 – button (UP in the text) – viewing the indicated parameters in the parameter view mode and viewing the menu in the

parameter setup mode

11 – button (DOWN in the text) – viewing the indicated parameters in the parameter view mode and viewing the menu in

the parameter setup mode

12 – button RES/MEM/SEL – recording parameters in the setup mode, switching the groups of displayed parameters in the

view mode, and reset

13 – button SETUP – turns on the parameter setup mode

Note 1. - is denoted in the text as З/Т

1.2.5 Protection functions

1.2.5.1 Types of protection

UBZ device provides the following types of induction motor protection:

- maximum phase current;

- against line-to-earth fault (based on zero sequence current):

- negative-sequence current protection

- for excess rate of current negative sequence factor relative to voltage negative sequence factor;

- for thermal overload;

- minimum phase current fault;

- for long lasting start (rotor block);

- for winding overheat;

- for minimum line voltage;

- for maximum line voltage;

- for line voltages imbalance (voltage negative sequence);

- for phase sequence order;

- for phase interlacing order failure;

- for reduction of mains frequency less than the preset value;

- for minimum resistance protection of motor winding insulation fault;

- for phases loss of the engine (operates at engine current loss in one (two) phase).

1.2.5.2 The maximum phase current protection

The maximum phase current protection is of three-phase type. It is engaged when one, two, or three current

values reach the tripping threshold.

The protection has a time delay setting. The delay can be independent (constant), or dependent (SIT - re-

verse dependent; VIT or LTI – very reverse dependent; EIT - extremely reverse dependent; UIT – ultra reverse

dependent; RI – delay time.) the tripping curves are displayed in Appendix 1.

When independent time delay protection is activated, the motor is

de-energized if one of the phases current exceeds the threshold val-

ue within T period of time (parameter “Imax delay”).

Is = “ Imax coef ” (tripping ratio) * “ Rated In” (motor rated current),

and T – protection tripping delay time

Example. When “ Imax coef “ = 4.0, “Rated In” = 10, “Imax delay “ = 10.0,

the motor shall shut down 10 sec after one of the phase currents ex-

ceeds 40 A.

Fig. 1.2 Principle of protection with independent time delay

The operation of the dependent time delay protection conforms to IEC 60255-3 and BS 142 standards.

In corresponds to “Rated In” setting (rated current of mo-

tor);

T (parameter “ Imax delay ” – protection function time con-

stant) – corresponds to the trip delay time for 10 In.

To deal with very high amperage currents the protection

has a feature with an independent time delay.

Fig. 1.3 Principle of protection with dependent time delay

Appendix 1 displays graphs for the protection function time constant equal to 1 second (“Imax delay” parame-

ter). When a different value for time constant is set, the protection trip time changes proportionally to the time

constant (for example, at “Imax delay”=10 seconds the protection trip time at the same current ratio will increase 10

times).

1.2.5.3 Earth fault protection

- activated when ground fault current reaches the trip threshold (“ I earth tresh ” parameter);

- motor is de-energized if the ground fault current exceeds the trip threshold within T time period (“ I earth delay ”

parameter).

1.2.5.4 The negative sequence (imbalance) protection

The negative sequence (imbalance) protection is activated when the negative sequence constituent exceeds

the threshold setting (“ I2 rev tresh ” parameter), and de-energizes motor when the period of such exceeding is

over the specified set value “ I2 rev delay ” parameter).

If the protection trip cause analysis is on (“A-s I2 prot”=”On”), then at time of negative sequence current

excess protection tripping that was not caused by the line voltages imbalance (in this case motor malfunction is

supposed), automatic reset will not be activated (regardless of the “ I2 rev protec ” parameter value).

The voltage (current) negative sequence factor is a characteristic of the three-phase voltage (current)

asymmetry. The voltage negative sequence factor can be calculated according to the following formula:

K2Ui=2(1)

1(1)

100i

i

U

U ,

where U2(1)i – negative sequence voltage RMS value of three-phase voltage system base frequency in the i-

th observation, V;

Ul(l)i. – base frequency positive sequence voltage RMS value in i-th observation, V.

U2(1)i is calculated by the approximation formula:

U2(1)i=0.62(Uнб(1)i) – Uнм(1)i),

where Uнб(1)i, Uнм(1)i — the largest and the smallest RMS value of three phase-to-phase base frequency

voltages in the i-th observation, V.

The K2Ii - current negative-sequence factor is calculated in a similar way.

If the current imbalance has not been caused by voltage imbalance, a motor malfunction shall be deter-

mined. To determine the imbalance cause the excess of the rate of current negative sequence ratio relative to

voltage negative sequence ratio (K2Ii / K2Ui) shall be calculated. And if the rate exceeds the “ A-s I2 coef” pa-

rameter value, the motor is considered faulty.

1.2.5.5 Minimum phase current protection

- initiated when all the phases currents fall below the setting threshold (“ Imin tresh ” parameter), and de-

energizes the motor when the time of the falling exceeds the set value (“ Imin delay ” parameter);

- inactive when load current is less than 10% of In value (when current decrease is caused by the motor de-

energizing, and not by the load decrease);

- provided with an independent AR delay action (“ AR time Imin ” parameter).

1.2.5.6 Delayed start, rotor lock-up

The principle of protection operation for the long lasting start and rotor lock-up is displayed in Figure 1.4.

Delayed start.

During startup the protection trips, all phase currents exceed the Is threshold setting (“Start I Coef.” pa-

rameter) within time period that is longer than ST time delay (“ Start I delay’ parameter).

Rotor lock-up

After motor startup completion (in-rush starting current is less than 1.2 of the rated current), UBZ switches

to control over the possible rotor lock-up. The protection trips when all phase currents exceed the threshold set-

ting within time period that is longer than LT time delay (“ Block I delay” parameter).

Fig.1.4. Delayed start, rotor lock-up

1.2.5.7 Thermal overload protection

The thermal overload protection is designed on the basis of electromotor thermal balance equation under

the following assumptions:

- the motor was cold before first start;

- during operation the motor releases the amount of heat proportional to the square value of the current;

- after the stop, the motor cools down exponentially.

For the protection to function the double overload tripping time Т2 (“Termal delay” parameter) has to be

set up.

Below is the current-to-time characteristic curve with different T2 values shown in Figure 1.5.

The current-time characteristic dependence shown in table 1.6 below is given for the standard recommend-

ed T2 value (60 sec when double overload occurs).

Table 1.6.

I/Inom 1.1 1.2 1.4 1.7 2 2.7 3

Тsec 365 247 148 88.6 60 36.4 24.6

I/Inom 4 5 6 7 8 10 15

Тsec 13.5 8.5 5.9 4.3 3.3 2.1 0.9

Cooling rotating machines is more effective during operation, rather than at time of motor stall, that is why

“Termal C Stop” parameter – the cooling constant increase rate during motor stop is introduced.

After load relay de-energizing at thermal overload with automatic reset permitted, the relay will re-

energize after time period that is longer than one of the two:

- thermal hysteresis time, i.e. the motor must cool down 33% of the accumulated heat;

- AR time.

By suitable selection of different AR values, thermal hysteresis considered, one can reduce number of

starts per time unit because in the intermittent cycle the device accumulates heat amount that is released at the

start of the motor.

I/Iн - current ratio relative to the rated current;

T/T2 - actual trip delay relative to T2. (double overload tripping time).

Fig. 1.5. Current-time characteristic dependence

1.2.5.8 Winding overheat protection

Depending on the threshold settings selected, the protection can function via the first input with the follow-

ing temperature sensors:

1) with temperature sensors integrated into the motor (“Temp S1 Type”=”R>1,7k”). In this case the “Temp

S1 Off M” threshold setting is not engaged and sensor short circuit and open circuit are not monitored. The pro-

tection trips when sensor impedance will exceed 1700 Ohm.+

2) with sensors of PTC type (setting “Temp S1 Type”=”PTC”)(1kOhm at 25°С) (with this sensor, the

measured temperature cannot exceed 100°С).

Via input two the protection functions with temperature sensors of Pt100 type (platinum, 100 ohm at 0°С)

or Ni100 or Ni120 (nickel, 100 ohm (120 ohm) at 0°С) according to IEC 60751 and DIN 43760 standards.

Protection via input two:

- is engaged when temperature controlled exceeds the threshold setting;

- has two independent threshold settings: the alarm setting (parameter “Temp S2 Alarm”) and de-energize

setting (parameter “Temp S2 Off M”).

The protection monitors circuit breaks and short circuit occurrence on temperature sensors:

-circuit break at temperature over 220 °C;

-short circuit at temperature below minus 45 °C.

1.2.6.9 Voltage based protection

In voltage-based protections, before load energizing, the UBZ device checks for corresponding threshold

settings, and, depending on their value, either permits or prohibits load energization; after load energization the

voltage control is retained, but the de-energization decision is made relatively to currents.

Voltage-based protections include:

- protection for minimum line voltage (it trips when at least one of the line currents is less than the thresh-

old setting (“ Umin tresh ” parameter) within time specified by “ Umin delay” parameter);

- protection for maximum line voltage (it trips when at least one of the line currents is greater than the

threshold setting (“ Umax tresh” parameter) within time specified by “ Umax delay” parameter);

- protection for line voltages imbalance (trips if difference between RMS voltages exceeds the set thresh-

old (“ Uimbal tresh” parameter) within time assigned by “ Uimbal delay” parameter).

1.2.5.10 Protection based on phase sequence

Protection based on phase sequence (“Ucorrect phase” parameter) order trips in case of phase sequence or-

der fault, it de-energizes the motor and locks its further operation.

1.2.5.11 Protection based on mains frequency reduction

Protection based on mains frequency reduction will trip, if the mains frequency becomes less than the set-

ting (“Frequency Min” parameter) within the time, preset by the “FreqMin delay” parameter.

1.2.5.12 Minimum resistance protection of motor winding insulation

After the device voltage energizing and before output relay closure, the level of stator winding insulation

relative to casing is checked. The level of stator winding insulation relative to casing is checked also when the

load relay is closed, but motor currents are less than 10% of rated current (in such case it is supposed that the

motor is off).

When “Isolation M-r” = “5 AR” (“5 nAR”) load is not energized, if insulation resistance falls below 500

kOhm + 20 kOhm, and when “Isolation M-r” = “10 AR” (“10 nAR”), if it falls below 1000 kOhm + 50 kOhm.

1.2.5.13 Motor protection against phase (phases) loss (missing)

Motor protection against phase (phases) loss (missing) will trip, if in one of the motor phases the current is

over 10% of the rated value (“ Rated In ” parameter), and in each of the remaining motor phases it is less than

7% of the motor rated current.

1.3 PRODUCT PACKAGE CONTENTS

The product package contents are shown in Table 1.7.

Product contents

Table 1.7.

Description Abbreviation

UBZ-304 unit UBZ-304

Differential current transformer (zero sequence transformer) *

Cable for communication with PC via RS-232 * KC-01

Transmitter cable for communication with PC via USB * KC-USB-01

Temperature sensor (types - Pt100, Ni100, Ni120)* Pt100, Ni100, Ni120

* - supplied optionally

1.4 EQUIPMENT FEATURES AND OPERATION

The device is a microprocessor-based digital device that provides a high degree of reliability and accuracy.

It's self-powered by the voltage to be monitored.

2. PROPER USE

2.1. SAFETY

All connections must be performed on dead device.

2.2 UBZ UNIT CONTROL

2.2.1 UBZ has five control modes:

- keyboard lock level;

- mode with minimal number of setting parameters (further on referred to as MSPM);

- user level;

- service engineer level;

- remote control.

In all operation modes the following features are available:

- viewing measured and displayed parameters (Table 1.4). Scrolling through parameters list is performed

by DOWN and UP buttons;

-faults log view (par.2.4.6).

2.2.2 Viewing measured and displayed parameters

The measured and displayed parameters viewing mode is the main one. UBZ automatically returns to this

mode from all the other modes (if within 15 seconds no button was pressed)

1 – measured parameter (in this case – the current value of the phase motor currents);

2 – total amount of current faults

3 – number of the displayed fault

4 – parameter value (current value at the moment of fault)

5 – type of indicated fault (maximum current protection)

Fig. 2.1 UBZ indicator in the measured and displayed parameters viewing mode (if there is a fault)

Note. If any temperature sensor is disabled by software, instead of the temperature value (resistance) the

indicator will display “OFF”.

2.2.3 When keypad is locked, viewing and resetting programmable parameters is not possible.

When keypad is locked, pushing УСТАНОВКА – SETUP button will result “blocked buttons” message

display on indicator (fig.2.2).

Fig.2.2 Indicator, when the keypad is locked

To unlock the keyboard the SETUP button shall be pressed again. The "SETUP" LED lights up, and la-

bel "0" is blinking on the indicator. With the UP and DOWN buttons user enters a password digit from 1 to

9 and presses the RECORD/RESET/SELECT button. If the password is correct, the keypad is unlocked. If

after the keypad was unlocked no button is pressed during 15 sec and the lockage setting is not released by

user, the keypad will relock.

2.2.4 Unlocked keypad allows:

- to operate in MMSP mode;

- to change and to view the user level parameters and to view the service engineer level parameters (at the

user level);

- to view the service engineer level parameters (at the service engineer level).

2.2.4.1 MMSP mode

When UBZ unit is in the MMSP mode, green LED “РМКУП” (MMSP) is on. MSPM was designed to

ease the service persOnel operations with the UBZ device.

To employ MSPM mode, the user needs to set Sin=1 parameter, or perform resetting to factory settings

(par.2.2.4).

The difference between MMSP mode and the user mode is that the parameters not included in the MMSP

register are set to default factory values.

ATTENTION! If some programmable parameters have been modified by the user or service engi-

neer, but not included in the MMSP register, switching to MMSP mode will reset such parameters to fac-

tory settings. The parameters included in this register cannot be viewed or modified. Operations with the MMSP register

parameters are similar to the user level operations.

Adding parameters to the MMSP register and MMSP mode disabling is possible only in service en-

gineer access mode.

2.2.4.2 User Level

While turning off the MMSP mode (Minimal set parameter setting in the Off condition) LED “РМКУП”

(MMSP) goes out and UBZ transfers to the user mode.

To view and to change the user level parameters one needs to press the SETUP button, then "SETUP"

LED will glow and the indicator will display the user's menu.

.

Fig.2.3 User’s menu

By the UP and DOWN buttons select the necessary parameter (in fig. 2.3. the “CT nominal i” – rated CT

current – is selected) and press the SETUP button (fig.2.4)

Note. The ADV message in the line of the indicator means that the change of a parameter value is possible only in the

service engineer mode. The MMSP message in the fourth line of the indicator means that the parameter is included into the

MMSP list.

Fig.2.4 Parameter change screen in the user mode

By the UP and DOWN buttons select the necessary parameter value (the parameter value on the indicator

will start blinking).

To record the parameter – press RECORD/RESET/SELECT, to return to menu without change – press

SETUP button again. If no button is pressed during 15 sec the UBZ device goes into the initial state.

In the user mode the whole parameter list is displayed, but if a parameter is not in the MMSP list (the

fourth indicator line contains the OFF MMSP message), to change the parameter it is necessary to include it

into the MMSP list:

- select the parameter by the UP and DOWN buttons (fig.2.3);

- press the SETUP button;

- press the UP and DOWN buttons at the same time (fig.2.4) (the OFF MMSP message must

change for MMSP).

If the fourth line of the indicator contains the “ADV” message, the parameter change is possible only at

the service engineer level.

2.2.4.3. Service Engineer Level

Access to the Service Engineer level.

Push SETUP button and hold for 5 sec, then release the button.

If the level is protected by a password, the LED SETUP will glow, the label PASSWORD will appear on

the indicator and the “000” indication will blink (fig. 2.5).

Fig.2.5. Service Engineer Password

With the UP and DOWN buttons enter the three-digit service engineer password, digits from 1 to 9 and

separate dialing with pressing the RECORD/RESET/SELECT button. If the password is incorrect, the ER-

ROR label will light and the UBZ device will go back to the initial state after 15 sec, otherwise UBZ will

turn to the service engineer level (fig. 2.6).

Fig.2.6 Service Engineer Level

The procedure of changing parameters at the service engineer level is the same as at the user level

(par.2.2.4.2).

At the service engineer level, the availability of any parameter at the user level can be prohibited or per-

mitted. Action:

- with the UP and DOWN buttons select the parameter (fig.2.6);

- enter the parameter change menu by pressing the SETUP button;

- press the SETUP and DOWN buttons at the same time.

If the access to the parameter change at the user level is prohibited, the fourth line of the indicator will

contain the “ADV” message (fig.2.4).

2.2.4 Restoring factory settings

There are two ways to restore the factory settings.

First. Set up parameter “Default Factor” in the “On” condition. Upon exit from the parameter setup mode

all factory settings will be restored (excluding the Service Engineer Password).

Second. When powering UBZ on, hold down SETUP and RECORD/RESET/SELECT buttons during two

seconds. All factory settings, including the Service Engineer password, will be restored (Service Engineer pass-

word – 123).

After completion of the factory settings setup, the UBZ will start operation in MMSP mode, which shall

include the following parameters:

- output CT current, “CT out I”;

- rated CT current, “CT nom I”;

- motor rated current, “Rated In”.

2.3 PREPARING UBZ FOR OPERATION

2.3.1 COnect the current transformers with the rated output current 5А (1А) according to the fig.2.7.

2.3.2 Run through differential current transformer (zero sequence transformer) all three power phase cables

and cOnect the DCT to UBZ device.

2.3.3 For insulation test and control, cOnect insulation control terminal 25 to one of the Magnetic Starter (MS)

outputs. If the motor case is not grounded or there is the circuit with the insulated neutral terminal, or the neutral

wire is not cOnected to the UBZ terminal, then cOnect the motor case to the UBZ terminal 26.

2.3.4 COnect the motor to the UBZ unit in accordance with the figure 2.7. When using a motor with star-delta

windings switch, the cOnection shall be performed according to Enclosure 2.

2.3.5 To work with UBZ via PC as control or monitoring device with use of “UBZ Control Panel” software:

- install “UBZ Control Panel” software onto PC by running “setup_UBZ304.msi” application;

- cOnect “ЭВМ” (PC) cOnection plug on UBZ side panel to RS-232 plug on PC with use of KC-UBZ-304

cable;

- set parameter “cOnection” = “RS-232”.

Note 1. The “setup_UBZ304.msi” application can be downloaded from the “Novatek-Electro” website

(http://www.novatek-electro.com/production_ubz.htm).

Note 2. KC-UBZ-304 cable is supplied optionally. The user can make his own cable according to figure

2.8.

Note 3. Other user-developed software can be used for operation with UBZ device.

2.3.6 When using MODBUS, cOnect communication lines to terminals 33 (GND), 34 (line B RS-485), 35

(line A RS-485) of UBZ device. Set parameter “cOnection” = “RS-232”.

2.3.7 Energize UBZ.

Note. UBZ is supplied with motor rated current value set to zero. In this case the UBZ load relay will not

close before the motor rated current is set up. The motor rated current must be equal to at least 5А.

Load relay starting sequence after energizing is controlled by “AR time” и “Start>power” (par. 2.4.1.) pa-

rameter values.

2.3.8 At first starting according to the factory settings, UBZ is in the MMSP mode, in which it is possible to

set the following parameters:

- rated output CT current (5A or 1A, “CT out I” parameter);

- rated CT current (“CT nom“ parameter);

- rated motor current (“Rated In” parameter).

For normal operation of UBZ it is enough to set the specified parameters according to the used CT and

motor.

2.3.9 De-energize UBZ load.

2.3.10 COnect the motor magnetic contactor (the - MC) according to Fig 2.7.

Note. When the load relay is energized, contacts 5-6 and 8-9 are closed, when the relay is de-energized - con-

tacts 4-5 и 7-8 are closed.

R_iz_N

2

GND

26

T3b

temp_dat2-1

R_iz

3

2

T1b

4

T4

49R1

Pt100

T3e

X1-2

5

50

T2

t

K1-1

14

L1

3

T1e

51

АВ

15

L2

RxD_rs232

4

T2b

6

T316

L3

T2e

7

X2

T1

TxD_rs232

39

17

N

52

GND_RS232

УБЗ-302

8

Конт

40

18

L1

X1-1

9

Tdif_b

Конт

19

L2

27

GND

K1-2-nc

Tdif_e

МПКонт

44

L3

28.5

GND

K1-1-com

35

Наименование

45

N

30

temp_dat2-2

K1-1-no

23

34


R2

PTC

GND

K1-1-nc31.5

temp_dat1

K1-2-com

24

33


GND

K2-nc

K2-no

K1-2-no

25

B RS-485

AN_U

t

K2-com

1

M~3

MO1MOTOR AC

K2

A RS-485K1-2

AN_I

48

К1 relay – load relay К2 relay – programmable relay

Fig. 2.7 UBZ Connection Diagram

http://www.novatek-electro.com/production_ubz.htm

2.4 PROPER USE

Note. In the UBZ operation description, it is assumed that the protections described are enabled and all

necessary sensors are cOnected.

2.4.1 UBZ operation before load relay closure

2.4.1.1. UBZ operation after power-on (first start).

After power-on, the mnemonic indicator displays Start UBZ for 1-2 seconds, and then before load energiz-

ing the device tests:

- the level of stator insulation to frame (when insulation resistance is below 500 + 20 kOhm at “Isolation

M-r” =”5” (1000 + 50 kOhm at “Isolation M-r” =”10”) load is not energized);

- mains voltage quality: whether voltage is present on all three phases, if the mains voltage is symmet-

rical, what the RMS line voltage value is like;

- a correct phase sequence, and phase «non-coincidence».

When any of inhibiting factors is present, the load relay is not closed, and on the mnemonics indicator

FAULT LED glows.

Depending on the “Indicat <Start” parameter, the indicator displays:

- line voltage at “Indicat <Start”=”Line U”;

- insulation resistance of motor and AR time countdown in seconds, at “Indicat <Start”= “Iso AR”.

When power-on inhibiting factors are not present, the load relay closure is defined by “Start>power” pa-

rameter value (UBZ device operation after power-on):

1) When “Start>power” = “StaOff” the load relay will not close. To close load relay in this case both

DOWN and UP buttons have to be pressed simultaneously.

2) When “Start>power” = “Sta>AR” the load relay will close after AR time.

3) When “Start>power” = “Sta>2s” the load relay will close in 2 sec after power-on.

Simultaneously with the load relay closure, green LED LOAD starts to glow.

After the load relay closure and before the motor start (the moment of motor start is defined when the load

current exceeds the level of 1.2 rated current), the monitoring and decision making for the voltage quality con-

tinue. If during the dead time inhibiting factors appear, then the load relay opens.

UBZ operation with the motor remote control via RS-232/RS-485 (“MotorOp RS-2/5” parameter) permit-

ted is covered in paragraph 2.4.4.8.

2.4.1.2. UBZ device operation after a fault-caused de-energizing.

The UBZ device operation in such case is similar to the first start operation, but the load relay closure is

not dependent on the .“Start>power” parameter value.

If AR is prohibited after a fault (“AR”=Off), then the motor cannot be energized before UBZ is de-

energized. “AR” parameter value is effective for all types of faults except voltage faults. “Umax protect”, “Umin

protect”, and “Uimbal protec” parameters shall be used to prohibit AR in case of voltage faults.

2.4.2 The device operation after load relay closure and motor start

The device operation after load relay closure and motor start (currents that exceed 10% of the motor rated

current appear).

The UBZ unit performs voltage and current monitoring. The load relay is open when any protection from

table 2.8 trips, excluding:

- voltage protection;

- overcurrent protection when “Imax<>T” =”Im ind” (in such case the overload indication is present, but

the load relay does not open).

The indicator can display either motor phase currents or a user-selected parameter (parameter group) value.

The value of the user-selected parameter can be displayed either constantly (“indicat mode” =” Conti”), or with-

in 15 sec, and then motor phase currents (“Indicat mode “ = ”>15s”) indication is back.

2.4.3 Characterizing relay operation

Functions performed by the characterizing relay are defined by .“relay F mode” parameter.

At “Relay Fmode” =”Alarm” characterizing relay is used as an alarm relay (З/Т and РН LED are off). The

relay contacts are closed in case of any fault specified in Table 2.8.

At “Relay Fmode” = “Timer” characterizing relay is used as a time relay (З/Т and РН LED glow): it closes

after time specified in “Relay F time ” parameter after load relay closure.

At “Relay Fmode” = “St->D” characterizing relay is used to switch the motor windings star-to-delta (З/Т)

(star-delta) LED glows). In this mode the load relay closes the same way as in the ”Alarm” mode, but after time

specified in “Relay F time ” parameter it will open. After time, specified by the “ST>DELTA TIME” parameter,

after the load relay opening, the characterizing relay will close.

Note. When the characterizing relay is closed, the contacts 1-2 are open, and contacts 2-3 are closed.

2.4.4 Work with RS-485 interface under MODBUS protocol in the RTU mode

The UBZ device allows for data exchange with an external device via serial interface under MODBUS

protocol. During data exchange via RS-485 or RS-232 blue LED “ОБМЕН” “EXCHANGE” glows.

2.4.4.1 Communication parameters:

- device address: 1-247 (“Address UBZ-304” parameter);

- data transfer speed: 9600 baud, 19200 baud (“Data speed” parameter);

- reaction to loss of carrier: warning and continue operation, warning and motor stop, continue operation

without warning (“Loss cOnect” parameter);

- response timeout detection: 1sec –120sec (“Overexceeding” parameter);

- transmission word format – 8 bit, no parity check, two stop bits.

2.4.4.2 UBZ control from PC

Communication between PC and UBZ is effected through serial interface. The cOnection diagram is

shown in Figure 2.9. Each UBZ device has an individual communication address. PC controls each UBZ device

recognizing them by their address.

UBS can operate in Modbus networks, working in RTU mode.

Fig. 2.9 UBZ-302 COnection Diagram to the PC

2.4.4.3. Communication protocol

Data packet exchange between PC and UBZ is established. Data packet format is given in Table 2.1.

Table 2.1.

START silence interval – over 2msec at 9600 baud transfer rate, or over

4 msec at 19200 baud transfer rate

ADR UBZ device communication address (8 bit)

CMD Command code 8 bit

DATA 0 Data contents:

N*8 data bit (n<=24) ….

DATA (n-1)

CRC CHK low CRC checksum

16 bit CRC CHK high

END silence interval – over 2msec at 9600 baud transfer rate, or over

4 msec at 19200 baud transfer rate

2.4.4.4 CMD (command code) and DATA (data symbols)

Data symbols format depends on command codes.

Command code –0x03, n-words read.

For example, read 2 continuous words swapped from 2102H initial address in UBZ with 01H communi-

cation address (Table 2.2).

Table 2.2

Command message Response message

ADR 0x01 ADR 0x01

CMD 0x03 CMD 0x03

Start data address 0x21

0x02

Data amount, bytes 0x04

Data amount in words 0x00

0x02

Data contents by address 0x17

0x70

CRC CHK low 0x6F Data contents by address 0x00

0x00

CRC CHK high 0xF7 CRC CHK low 0xFE

CRC CHK high 0x5C

Command code 0x06, record – one word

Using this command is not recommended as recording incorrect data may lead to UBZ failure.

Data recording is possible only to the programmable parameters addresses (Table 1.5), except for param-

eters listed in Table 2.3.

Table 2.3.

Settings and read-off parameters Displayed on indi-

cator

Address

Equipment operation time counter, days Time UBZ-304 207

Motor operation time, days Time motor 208

User access code Users code 209

Service engineer access code Advance code 210

System reset to factory settings Default Factor 211

Device version Version 217

A parameter recording is performed independently from the installed Service Engineer protection (the en-

try made via communication line has a higher priority).

When a new parameter value is recorded into a MMSP - protected cell, such parameter will automatically

be excluded from this mode.

Recorded parameters must be aliquot to iteration specified in Table 1.5.

For example, record 1000 (0x03E8) to register with 0x00A0 address into UBZ with 01H communication

address.

Table 2.4

Command message Response message

ADR 0x01 ADR 0x01

CMD 0x06 CMD 0x06


0xA0


0xA0

Data 0x03

0xE8

Data 0x03

0xE8

CRC CHK low 0x89 CRC CHK low 0x89

CRC CHK high 0x56 CRC CHK high 0x56

Command code 08h – diagnostics.

08h function provides a number of tests for checking communication system between PC and UBZ device,

as well as for UBZ integrity control.

The function uses the sub function field to specify the action (test) performed.

Sub function 00h – query data return.

Data transferred in the query field must return in the response data field.

Query and response example is given in Fig. 2.10.

Fig. 2.10. - Example of sub function query and return 00h –query data return.

01h sub function – communication options restart

UBZ peripheral port shall be initialized and restarted.

Query and response example is given in Fig. 2.11.

Fig. 2.11. - Example of sub function query and return 01h communication options restart.

2.4.4.5 CRC - Cyclic redundancy check code

The checksum (CRC16) is a cyclic redundancy check code based on A001h polynomial. The transmitting

device forms the checksum for all bytes of the message transmitted. The receiving device similarly forms the

checksum for all bytes of the message received, and compares it to the checksum received form the transmission

device. When received and transmitted checksums do not match, an error message is generated.

The checksum field size occupies two bytes. The checksum within message is transferred with low byte

coming first.

The checksum is registered under the following algorithm:

1) load CRC register (16 bit) with units (FFFFh);

2) exclusive OR with first 8 bytes of message and CRC register contents;

3) offset the result one bit to the right;

4) if the offset bit =1, the exclusive OR of the register contents with A001h value;

5) if the offset bit=0, repeat step 3;

6) repeat steps 3, 4, 5 until 8 offsets have been completed;

7) exclusive OR with the next 8 bits of the message byte and CRC register contents;

8) repeat steps 3 – 7, until all bytes of the message have been processed;

9) the finite register contents will contain the checksum.

Here is an example of CRC code generation with use of C programming language. The function takes two

arguments:

Unsigned char* data <- a pointer to the message buffer

Unsigned char length <- the quantity of bytes in the message buffer

The function returns the CRC value as a type of unsigned integer.

Unsigned int crc_chk(unsigned char* data, unsigned char length)

{int j;

unsigned int reg_crc=0xFFFF;

while(length--)

{

reg_crc ^= *data++;

for(j=0;j<8;j++)

{

if(reg_crc & 0х01) reg_crc=(reg_crc>>1) ^ 0xA001; // LSB(b0)=1

else reg_crc=reg_crc>>1;

}

}

return reg_crc;

}

2.4.4.6 Register addresses

The register addresses of the measured and calculated parameters of the UBZ device are given in table 1.4.

The addresses of programmable parameter registers are given in table 1.5.

Additional registers and their functions are shown in table 2.5.

Table 2.5

Description Address Application Comment

UBZ status register

240

Bit 0 0-no fault

1- fault (fault code in register 241)

Bit 1 0- load relay on

1- load relay off

Bit 2 0- characterizing relay open

1- characterizing relay closed

Bit 3 0 – there will be no restart

1 – AR is expected

Bit 5-

4

Characterizing mode of relay operation

00 - alarm relay

01 - time relay

10 - star / delta

Bit 6 0- MSPM mode disabled

1- MSPM mode enabled

Fault register 1 241 bit mapping shown in table 2.8 0-no fault

1-fault Fault register 2 242 bit mapping shown in table 2.8

Fault log

Fault code 1 243 fault code according to table 2.8

Value of parameter 1 244 parameter value according to table 2.8

Fault time 1 245 two upper bytes

246 two lower bytes




250 two lower bytes




254 two lower bytes




258 two lower bytes




262 two lower bytes

Note 1. Fault time - is a time from the UBZ device power-on till the fault time. Measured in minutes.

Note 2. At time of UBZ delivery or after reset to factory parameters (par.2.4.4) error code 40 and param-

eter value 10000 are recorded into the fault log.

2.4.4.7 Communication error handling

When an error situation occurs at time of a frame receipt (parity error, frame error, checksum error), the

UBZ device does not return a response.

When an error occurs in the format or in the value of the data transferred (unsupported function code,

etc.), UBZ received the query frame and forms a response with the error indicator and code. A high-order func-

tion field bit inserted in the unit serves as error indicator. A separate field in the response is allocated for the er-

ror code. A response example is given in Figure. 2.12. Error codes are shown in Table 2.6.

Figure. 2.12. Example of an after-error response.

Table 2.6

Error code Title Description

01h ILLEGAL FUNCTION Function code received cannot be processed by UBZ

02h ILLEGAL DATA AD-

DRESS

Data address in the query is not accessible by the given subor-

dinate

03h ILLEGAL DATA VALUE Value contained in the query data field is not a valid value for

UBZ

04h SLAVE DEVICE FAILURE While UBZ attempted to perform the requested action, unre-

coverable error occurred

05h ACKNOWLEDGE

UBZ accepted query and is processing it, but it requires a long

time. Such response prevents master from timeout error gener-

ation.

06h SLAVE DEVICE BUSY UBZ device is busy with command processing. Master must

repeat message later when the slave is free.

07h NEGATIVE

ACKNOWLEDGE

UBZ cannot perform the program function received in the que-

ry

2.4.4.8 The motor remote control via RS-232/RS-485 interface.

UBZ device operation in the remote control mode is defined by the “MotorOp R S-2/5 “ parameter.

When “MotorOp R S-2/5 “ equals:

“Off” - the motor remote control is prohibited.

“OnSta” - the UBZ device after power-on works similarly as when the remote control is off (normal opera-

tion), but writing to the R_COMMAND command register is permitted.

“OffSta” - UBZ device will energize motor only after the corresponding command via RS-232/RS-485 has

been received.

The R_COMMAND value is regarded by the UBZ operation algorithm when “MotorOp RS-2/5”

=“OnSta” and “MotorOp RS-2/5” =”OffSta”. If “MotorOp RS-2/5” =”Off” and the user sets “MotorOp RS-

2/5” “OnSta” or “MotorOp RS-2/5” =” OffSta”, then 0 will be recorded to R_COMMAND.

The list of possible command register settings is shown in Table 2.7.

Table 2.7.

R_COMMAND

command register

Address = 237

Actions performed

0 Power-off motor. If the motor is de-energized, then before a power-on command from the

Remote Control has been received, the motor will not energize. If the motor is energized,

it will be de-energized.

1 Normal device operation.

If the motor was de-energized by the remote control command or by simultaneous press-

ing DOWN, UP buttons (while ACd=3), or in case of a fault after which automatic restart

is permitted, then the motor will be energized, and 1 recorded in the R_COMMAND reg-

ister within specified automatic restart time from the moment of de-energizing.

2 Early motor energizing. Value “2” record will lead to motor power-on until expiration of

the automatic reset time period. After motor power-on, R_COMMAND =1.

If “MotorOp RS-2/5” =”OnSta”, then 1 will be entered into the command register after startup (normal op-

eration of the device).

If “MotorOp RS-2/5” =”OffSta”, then 0 will be entered into the command register after startup (motor is

shut down until the command for start up is entered).

By the emergency shutdown of motor by means of simultaneous pressing the DOWN and UP buttons

(when ACd=2, ACd=3), the command register will be reset to 0.

2.4.5 Fault conditions system

In case of fault condition occurrence, the UBZ device performs following actions:

- the fault message appears in the fourth line of the indicator (fig. 2.13) (the fault code complies with the ta-

ble 2.8);

1 – measured parameter (in this case – the current value of motor phase currents);

2 – total amount of current faults;

3 – number of the displayed fault;

4 – parameter value (value of current at the moment of the fault)

5 – code of the indicated fault (maximum current protection)

Fig. 2.13. UBZ indicator in the measured and displayed parameters view mode (if there is a fault)

- red LED FAULT lights (glows continuously if AR will not initiate, and flickers if AR is expected);

- load relay opens;

- the characterizing relay is closing at “Relay F Mode” = “Alarm”.

If UBZ defines several types of faults simultaneously, the error codes and parameter values are displayed

consecutively, one after one (the number of the displayed fault is changed on the indicator).

When AR is permitted, the indicator displays fault codes and time left till AR (fig. 2.14) (if thermal over-

load delay time exceeds the AR value, the delay time is displayed).

Fig. 2.14 Indicator, displaying the time, remained until AR

Fault codes

Table 2.9

Fault description Fault mne-

monic

Parameter value Parameter

value regis-

ter address

Fault

code

Fault regis-

ter address

of the N bit

maximum phase current fault Imax maximum phase current 300 0 241:0

thermal overload fault Thermal over 301 1 241:1

against line-to-earth fault

(based on zero sequence cur-

rent)

Iearth zero sequence current 302 2 241:2

excess rate of current negative

sequence ratio relative to volt-

age negative sequence ratio

C I/U Current negative-

sequence factor * 100

303 3 241:3

negative-sequence current

fault

I2 rev negative sequence cur-

rent

304 4 241:4

minimum phase current fault I min 305 5 241:5

long-lasting start LongSt current 306 6 241:6

rotor lock-up BlockR current 307 7 241:7

reaching the temperature

threshold of the first sensor

Temp1 temperature in degrees 308 8 241:8

reaching the temperature

threshold of the second sensor

Temp2 temperature in degrees 309 9 241:9

phase sequence order fault PhaseSequen 310 10 241:10

currents present when load re-

lay is de-energized (contactor

fault)

Cont-r current 311 11 241:11

minimum line voltage fault U min voltage 312 12 241:12

maximum line voltage fault U max voltage 313 13 241:13

phase imbalance fault Uimbal imbalance 314 14 241:14

minimum resistance protection

of motor winding insulation

fault

ResMin insulation resistance 315 15 241:15

minimum mains frequency F min frequency 316 16 242:0

remote control channel fault RemoteCont 17 242:1

emergency motor stop, auto-

matic restart not possible

Stop nAR 18 242:2

emergency motor stop, auto-

matic restart possible by sim-

ultaneous pressing UP and

DOWN buttons

Stop Motor 19 242:3

short circuit of the TS1 ShortTempS1 20 242:4

circuit break of TS1 BreaktempS1 21 242:5

short circuit of the TS2 ShortTempS2 22 242:6

circuit break of TS2 BreakTempS2 23 242:7

phase loss fault Break Phase 25 242:8

2.4.6 Faulty conditions log

When load relay in case of fault opens, the UBZ device stores the fault code, the parameter value, and time

of occurrence.

Note. Time of fault is defined by the device’s internal clock. As UBZ device has no integral power source,

the time when the device was not powered, is not accounted.

Number of synchronously stored fault codes is ten. When next following faults occur, the information of

this fault is recorded over the latest fault.

To view log press RES/MEM/SEL button.

The SETUP LED will start to flicker, and the device’s indicator panels will display the latest fault (fig. 2.15).

Line 1 – mode indication (fault log)

Line 2 – fault number (1 – means the latest fault in time)

Line 3 – fault code according to the table 2.8 and the parameter value at the moment of fault occurrence

Line 4 – time, passed since the moment of fault

Fig.2.15 Indicator in the fault log view mode

Log scrolling is performed by pressing UP and DOWN buttons.

To exit log view mode press RES/MEM/SEL button, or the log will close automatically after 30 sec since a

button was last pressed.

2.4.7 Motor control with use of UBZ front panel

Depending on the “MotorOp UBZ” parameter value, the load relay can be controlled by pressing buttons

UP and DOWN simultaneously (unless UBZ device is in keypad lock-up mode).

“Off” - no reaction.

“Start” (motor start is permitted) – the load relay shall close if the AR time has not run out.

“Stop” (emergency motor shutdown) –the load relay shall open with the “ Stop nAR ” fault code.

Motor restart is possible only after discOnecting and re-cOnecting power to UBZ device;

“St<>” (motor start and stop is permitted) –the load relay shall open and produce Stop Motor” fault code.

To close, press UP and DOWN buttons again.

Note. When parameter “ Start>power ”= ”StaOff ” (manual motor start via UBZ front panel after

power-on) and “MotorOp UBZ”=”Off” (manual motor control prohibited) are selected, the load relay

will not close.

3. MAINTENANCE

3.1. Safety

During maintenance operations, UBZ power supply must be discOnected.

3.2 Maintenance schedule

Recommended maintenance schedule – semiannually.

Maintenance scheduled operations consist of visual observation, during which wiring cOnection to ter-

minals is checked, frame and casing integrity check for cracking and chipping.

4. TRANSPORTATION AND STORAGE

The UBZ-304 device in manufacturer’s package shall be stored in enclosed rooms at temperature from –

45° to +65°C and exposed to no more than 80 % of relative humidity when there are no fumes in the air that

have a damaging effect on the package and the equipment material. The customer shall provide for the UBZ-304

equipment protection against mechanical damage while in transport.

5. PERIOD OF SERVICE AND STORAGE; MANUFACTURER’S WARRANTY

The UBZ-304 equipment service period is 10 years. Upon expiration of the equipment service period,

please, contact the manufacturer.

The manufacturer warrants defect-free performance of UBZ-304 device within three years after the date of

sale provided that the following conditions have been met:

- proper installation;

- manufacturer’s QC department inspection seal is intact;

- integrity of the device case, no traces of opening, cracks, chipping, etc.

6. ACCEPTANCE CERTIFICATE

The universal induction motor protection device UBZ-304, SERIAL # ____________________ was manufac-

tured and accepted in accordance with the compulsory requirements of state standards and of the ef-

fective technical regulative documentation and is declared fit for the original purpose.

DATE OF MANUFACTURE________________________________

QUALITY CONTROL DEPARTMENT MANAGER ____________________ SIGNATURE

OC DEPARTMENT SEAL

DATE OF SALE________________________________

Contact:

NOVATEK ELECTRO (INDIA) PVT. LTD.

C-30, Patparganj Industrial Area, 1st floor,

Delhi – 110092, India.

Tel: +91 11 42143253, 43010600

Web: http://www.novatek-electro.com/en

http://www.novatek-electro.com/en

Appendix 1. Dependent time delay current based protection types

Appendix 2. UBZ motor control operation with the star-delta winding switching

If before motor startup the winding insulation resistance to motor frame does not need to be measured, it

is allowed to cOnect UBZ according to simple diagram as in Figure P1.

If before motor startup the winding insulation resistance to motor frame needs to be measured, UBZ must

be cOnected according to Figure P2.

During star-delta UBZ operation, the following methods of motor control are allowed:

- motor startup/shutdown is performed by means of an external automatic circuit breaker (starter switch)

simultaneously with UBZ de-energizing/energizing;

- motor control with use of UBZ front panel;

- motor control via RS-232/RS-485 interface.

It is strictly prohibited to shut down motor by means of an external automatic circuit breaker (starter

switch) without de-energizing UBZ. As exception, it is allowed after motor de-energizing by means of an exter-

nal automatic circuit breaker (starter switch), additionally de-energize motor via UBZ front panel or via RS-

232/RS-485 to avoid delta-switched direct-on-line starting.

K2-nc

T2b

2

L1

V2

25

40

K1-2-com

W2

K1-2-nc


51

N

AN_I

temp_dat2-1

B RS-485

L1

b

t

X2

T3e

17

c

14

50

T1

5

35

temp_dat2-2

Конт

39

d

R_iz

24

T1e

52

30

1

e

K1-1-no

9

N K1-1-nc

48

49

GND

L3

GND

f

T2

33

Tdif_e


16

R_iz_N

T3b

X1-2

b

X1-1

GND

AN_U

19

23

K2-no

GND_RS232

c

R1

Pt100

4

K1-1

26

L3

8

GND

Конт

d45

K1-1TxD_rs232

K2-1

K1-1-com

Tdif_b

K1-2-no

3

e

4

734

3

28.5

УБЗ-302

A RS-485

K1

f

T1b

K2-com

R2

PTC

T2e

K1-2


U1

44

T4

M

L2

T3

U2

a

GND

K2

RxD_rs232

K2

temp_dat1

V1

15

2

6

31.5

W1

t

18

27

L2

a

Конт

К1 – delta-switch motor winding starter

К2 – star-switch motor winding starter

Figure P1. UBZ cOnection schematic for motor operation with star-delta switching without motor insu-

lation monitoring

W1

34

U1

K5

9

M

W2

K2-nc

T3b

X1-1

K5-1

V2

RxD_rs232

L3

V1

3

L1

X2

R2

PTC

A RS-485

b

2TxD_rs232

31.5

e

33

30


УБЗ-302

K1-2

K1-2-com

f

K2-no

N

Конт

52

51

K1-1

L1

23

K2-2

7

1

U2

8

K1-1-no

17

K2-1

temp_dat2-1

T3e

K3-1

4

R_iz_N

5

K1-1-nc

Конт

T1e

48

T1

GND

15

temp_dat2-2

16

T2

B RS-485

R_iz

3

b

c

T4t

K1-2-nc

GND

d

R1

Pt100

K1-1-com

e


GND_RS232

44

T2e45

a

40

Конт

24

L2

25

Tdif_e

temp_dat1

K2-com

GND

18

35K1-2

Tdif_b

2

T2b

L2

50

AN_U 14

N

39

K4

0

K2

6

X1-2

K1-1

f

28.5

49


K3

T1b

4

c

K4-1

GND

K1

t

AN_I

K2

T3

L3

26

19

K1-2-no

a

GND

d

27

К1 – interposing relay for delta-switching of motor winding

К2 – interposing relay for star-switching of motor winding

К3 – motor power-on starter

К4 – delta-switch motor winding starter

К5 – star-switch motor winding starter

Figure P2. UBZ connection schematic for motor operation with star-delta switching with motor insula-

tion monitoring

universal electric motor protection device (numeric relay) ubz...

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