tp48300-a-n07a3 maintenance guide ( v100r001_04) (2)

TP48300/A-N07A3 V100R001

Maintenance Guide

Issue 04

Date 2013-05-07

HUAWEI TECHNOLOGIES CO., LTD.

Issue 04 (2013-05-07) Huawei Proprietary and Confidential

Copyright © Huawei Technologies Co., Ltd

i

Copyright © Huawei Technologies Co., Ltd. 2013. All rights reserved.

No part of this document may be reproduced or transmitted in any form or by any means without prior

written consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions

and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd.

All other trademarks and trade names mentioned in this document are the property of their respective

holders.

Notice

The purchased products, services and features are stipulated by the contract made between Huawei and

the customer. All or part of the products, services and features described in this document may not be

within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements,

information, and recommendations in this document are provided "AS IS" without warranties, guarantees or

representations of any kind, either express or implied.

The information in this document is subject to change without notice. Every effort has been made in the

preparation of this document to ensure accuracy of the contents, but all statements, information, and

recommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Technologies Co., Ltd.

Address: Huawei Industrial Base

Bantian, Longgang

Shenzhen 518129

People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

http://www.huawei.com/

mailto:[email protected]

TP48300/A-N07A3

Maintenance Guide About This Document



ii

About This Document

Purpose

This document describes how to maintain and troubleshoot the TP48300/A-N07A3 and its

components.

Intended Audience

This document is intended for:

Sales engineers

Technical support personnel

Maintenance engineers

Symbol Conventions

The symbols that may be found in this document are defined as follows.

Symbol Description

Alerts you to a high risk hazard that could, if not avoided,

result in serious injury or death.

Alerts you to a medium or low risk hazard that could, if not

avoided, result in moderate or minor injury.

Alerts you to a potentially hazardous situation that could, if

not avoided, result in equipment damage, data loss,

performance deterioration, or unanticipated results.

Provides a tip that may help you solve a problem or save time.

Provides additional information to emphasize or supplement

important points in the main text.

TP48300/A-N07A3

Maintenance Guide About This Document



iii

Change History

Changes between document issues are cumulative. The latest document issue contains all the

changes made in earlier issues.

Issue 04 (2013-05-07)

Optimized the content of the document, including standardizing the terminology and

improving the accuracy of the description.

Issue 03 (2012-11-01)

Port description is modified.

Issue 02 (2011-12-24)

Modified Table 5-1 measures of DC overvoltage or undervoltage .

Issue 01 (2011-08-27)

This issue is the first official release.

TP48300/A-N07A3

Maintenance Guide Contents



iv

Contents

About This Document .................................................................................................................... ii

1 Safety Precautions ......................................................................................................................... 1

2 Maintenance Preparations ........................................................................................................... 4

3 Overview ......................................................................................................................................... 6

4 Routine Maintenance ................................................................................................................. 16

5 Troubleshooting the TP48300/A-N07A3 ................................................................................. 20

6 Troubleshooting Components .................................................................................................. 29

7 Parts Replacement ....................................................................................................................... 34

A Appendix ..................................................................................................................................... 41

B Acronyms and Abbreviations .................................................................................................. 47

TP48300/A-N07A3

Maintenance Guide 1 Safety Precautions



1

1 Safety Precautions

This chapter describes the safety precautions for maintaining the TP48300/A-N07A3.

Overview

This section describes the safety precautions that you must take when installing, maintaining,

and operating Huawei equipment.

To minimize risk of personal injury and damage to equipment, read and follow all the

precautions in this document before performing any maintenance. The "NOTE", "CAUTION",

and "WARNING" marks in other documents do not represent all the safety instructions. They

are only supplements to the safety instructions. Therefore, only trained and qualified

personnel are allowed to install, operate, and maintain Huawei equipment, and they must

understand basic safety precautions to avoid hazards.

To ensure safety of humans and the equipment, pay attention to the safety symbols on the

equipment and all the safety instructions in this document. The safety precautions listed in this

document do not cover all the safety precautions. Huawei will not be liable for the

consequences that are caused by the violation of the safety operation regulations and design,

production, and usage standards.

Local Regulations and Standards

When operating Huawei equipment, you must follow the local laws and regulations. The

safety instructions in this document are only supplements to the local laws and regulations.

Grounding Requirements

Take the following precautions when installing a device:

Always make the ground connection first and disconnect it in the end.

Do not damage the ground conductor.

Do not operate the equipment in the absence of a properly installed ground conductor.

TP48300/A-N07A3




2

The device must be connected permanently to the protection ground before an operation.

Before operating the device, check the electrical connection of the device to ensure that

the device is securely grounded.

Human Safety Do not operate the device or cables during lightning strikes.

To avoid electric shock, do not connect safety extra-low voltage (SELV) circuits to

telecommunication network voltage (TNV) circuits.

Before operating the device, wear electrostatic discharge (ESD) clothes, ESD gloves, and

an ESD wrist strap. Remove conductive objects such as jewelry and watches to avoid

electric shocks or burns.

In case of fire, immediately evacuate from the building or the device room. Turn on the

fire alarm bell or make an emergency call. Never enter the building on fire in any case.

Equipment Safety The device must be fixed securely on the floor or to other immovable objects such as

walls and mounting racks before operation.

Do not block the air vent while the device is operating.

Tighten the thumbscrews by using a tool after initial installation and subsequent access

to the panel.

After the installation, remove the packing materials from the equipment area.

Electrical Safety High voltage

The high voltage power supply provides power for the device operation. Direct or indirect

contact (through damp objects) with high voltage and alternating current (AC) mains

supply may result in serious injury.

Non-standard and improper high voltage operations may result in fire and electric shock.

− The personnel who install the AC facility must be qualified to perform high voltage

and AC operations

− You must abide by the local rules and regulations when bridging and wiring AC

cables.

− During the operation of the AC power supply facility, follow the local safety

regulations.

− When operating the high-voltage and AC-powered facilities, use dedicated tools.

− When the operation is performed in a damp environment, ensure that the device is dry.

When water is found in the rack or the rack is damp, switch off the power supply

immediately.

High electrical leakage

− Ground the device before powering it on. Otherwise, personal injury or device

damage may be caused by high leakage current.

TP48300/A-N07A3




3

− If a "high electrical leakage" tag is present on the power terminal of the device, you

must ground the device before powering it on.

Power Cables

− Do not install or remove power cables when the device is on. Transient contact

between the core of the power cable and the conductor may generate electric arcs or

sparks, which may cause fire or hurt human eyes.

− Before installing or removing the power cable, turn off the power switch.

− Before connecting a power cable, verify that the label on the power cable is correct.

Fuse

− To ensure that the system runs safely, if a fuse is to be replaced, the new fuse must be

of the same type and specifications as the old one.

Electrostatic discharge

The static electricity generated by human bodies may damage the electrostatic-sensitive

components on boards, for example, the large-scale integrated (LSI) circuits.

− Human body movement, friction between human bodies and clothes, friction between

shoes and floors, or handling of plastic articles causes static electromagnetic fields on

human bodies. These static electromagnetic fields cannot be eliminated until the static

is discharged.

− To prevent electrostatic-sensitive components from being damaged by the static on

human bodies, you must wear a well-grounded ESD wrist strap when touching the

device or handling boards or application-specific integrated circuits (ASICs).

Figure 1-1 shows how to wear an ESD wrist strap.

Figure 1-1 Wearing an ESD wrist strap

TP48300/A-N07A3

Maintenance Guide 2 Maintenance Preparations



4

2 Maintenance Preparations

This chapter describes how to make maintenance preparations.

Getting Familiar with the Site

Before maintaining the TP48300/A-N07A3, you must get familiar with the site, drawings, and

installation procedure.

Preparing Tools

Tool Picture Function

Multimeter

Used to check cabinet

insulation and cable

connection, and measure

electronic performance

specifications of a device,

such as voltage, current, and

resistance.

Phillips screwdriver (M3

and M6)

Used to tighten screws.

Flat-head screwdriver (M3

and M6)

Used to tighten screws.

Socket wrench

Used to tighten bolts.

Torque wrench


Adjustable wrench


TP48300/A-N07A3

Maintenance Guide 2 Maintenance Preparations



5

Tool Picture Function

Hex key (M5)


Crimping tool

Used to crimp cord end

terminals.

Diagonal pliers

Used to cut cables.

Wire stripper

Used to strip the insulation

from electric wires.

PVC insulation tape

Used to insulate wires and

conductors.

Fuse extracting unit

Used to install or remove

fuses.

Brush and oil brush

Used to clean the shell and

plane and apply paint.

Sand paper

Used to remove rust.

Paint

Used to prevent rust.

TP48300/A-N07A3

Maintenance Guide 3 Overview



6

3 Overview

General Troubleshooting Procedure

The general procedure for troubleshooting the TP48300/A-N07A3 is as follows:

Step 1 Observe the indicators on each module to identify faults.

Step 2 Query fault information in the PMU.

Step 3 Record the indicator status on each module and all fault information displayed on the PMU.

Step 4 Determine the fault sources: the DC, AC, PSU, storage battery, or monitoring unit.

Step 5 Analyze fault causes based on fault sources by referring to maintenance cases or checklists.

Step 6 Rectify the faults.

Step 7 Record the troubleshooting procedure and obtained data.

Step 8 Query information displayed on the PMU again to ensure that all faults are rectified.

Step 9 Record the troubleshooting results.

----End

Typical Application

The TP48300/A-N07A3, AC power source, automatic transfer switch (ATS), and storage

batteries are combined to form a site power supply solution. Figure 3-1 shows the position of

the TP48300/A-N07A3 in a typical site solution.

TP48300/A-N07A3




7

Figure 3-1 Position of the TP48300/A-N07A3 in a typical site solution

Appearance

Figure 3-2 shows the TP48300/A-N07A3 interior.

TP48300/A-N07A3




8

Figure 3-2 TP48300/A-N07A3 interior

(1) Positive busbar of the DC

output

(2)Load low voltage

disconnection (LLVD) route

(3) Copper transfer bar

TP48300/A-N07A3




9

(4) AC surge protector (5) Grounding busbar of the

cabinet

(6) Connection to the

cathode of storage batteries

(7) Battery low voltage

disconnection (BLVD) route

(8) AC input circuit breaker (9) N wiring terminal

(10) Monitoring module (11) Rectifier module

NOTE

In Figure 3-2, on the top is the system with 220 V AC input and on the bottom is the system

with 110V AC input. N cable is disconnected at the input of 110 V AC.

Power monitoring system (PMU)

When a major alarm is generated on the TP48300/A-N07A3, the red ALM indicator on the

CPMU01 will be steady on and the buzzer will beep. Troubleshoot the fault based on the

alarms displayed on the CPMU01. For details about how to rectify the fault, see Table 5-1.

For details about menus on the CPMU01, see the Appendix. After the current alarm is cleared,

the ALM indicator on the CPMU01 turns off and the buzzer stops beeping. All alarms can be

queried in the alarm history.

Figure 3-3 shows the CPMU01 panel.

Figure 3-3 CPMU01 panel

Figure 3-4 shows how to query alarms on the CPMU01 panel.

TP48300/A-N07A3




10

Figure 3-4 Querying alarms on the CPMU01 panel

Figure 3-5 Querying alarms on the NetEco net work management UI

TP48300/A-N07A3




11

NOTE

The information on the NetEco net work management UI is for reference, for the actual UI please refer to the

UI of the TP48300/A-N07A3 power system.

Table 3-1 describes the indicators and buttons on the CPMU01.

Table 3-1 Indicators and buttons on the CPMU01 panel

Indicator or Button

Status Description

RUN indicator

(green)

Off The CPMU01 is faulty.

Steady on The CPMU01 is working properly but is not

communicating with Huawei

communications equipment.

Blinking slowly The CPMU01 is working properly and is

communicating with Huawei

communications equipment.

ALM indicator (red) Steady on If the red ALM indicator is steady on and

the buzzer beeps, a major alarm is generated.

▲ or ▼ Allows you to view menu items and set the value of a menu item.

Enter Enters the main menu from the standby screen, enters a submenu

from the main menu, or saves the settings of a submenu item.

Cancel Returns to the previous menu without saving the settings of the

current menu item.

NOTE

The backlight turns off if the liquid crystal display (LCD) of the CPMU01 is left unattended for 8

minutes. The standby screen is displayed if the LCD is left unattended for 5 minutes.

On the standby screen, press ▼+Enter to decrease the LCD contrast, and press ▲+Enter to increase

the LCD contrast.

Monitoring Backplane

NOTE

All ports in this manual are protected by a security mechanism.

The monitoring backplane is a transfer board that implements the signal transmission between

the PMU and the main equipment, and between the PMU and the sensors. Figure 3-6 shows

the ports on the monitoring backplane PW31PMBA VER.C BP.F.

TP48300/A-N07A3




12

Figure 3-6 Monitoring backplane ports

Table 3-2 Description on ports of the monitoring backplane

Port Description

DC_SPD Fault alarm port for DC surge protector

AC_SPD Fault alarm port for AC surge protector

JTD1 Standby input port 1 for Boolean value

JTD2 Standby input port 2 for Boolean value

TEM_HUM Port for humidity/temperature sensors

VTEM2 Port for temperature sensor

VBTEM1 Port 1 for the temperature sensor of storage batteries

VBTEM2 Port 2 for the temperature sensor of storage batteries

J19 Port for controlling the powering on and powering off of batteries and

loads

SIM1 Port 1 for voltage-type analog (0 V to 64 V)


WIRE Port for Voltage-type analog (0 V to 64 V) to monitor the status of

the DDF


Authentication

Center (AC)

AC detection port

J18 Port for connecting the negative poles of the batteries and the busbar

J3 Port for monitoring busbar voltage

FUS1 Port 1 for monitoring the disconnection of the battery fuse

FUS2 Port 2 for monitoring the disconnection of the battery fuse

LAMP Port for cabinet lamp

J15 Port for monitoring the battery current

BATF Port for monitoring the fuse of the primary load shutdown

TP48300/A-N07A3




13

Port Description

LOADF Port for monitoring the fuse of the secondary load shutdown

J16 The RS485 port: the communication port between the PMU and the

PSU

J17 The RS485 port: the communication port between the PMU and the

PSU

J1 Backplane connector connected to the PMU signal port

J2 Backplane connector connected to the PMU power port

DB9 MODEM communication port

J11 Port RS232/RS422: communication port between the PMU and the

main equipment

J12 Commissioning port

DC surge protector

Figure 3-7 DC surge protector

Table 3-3 Description on ports of the DC surge protector

Port Description

J1 Port for connecting -48 V busbar

J2 Port for connecting the positive busbar of the DC output

J3 Port connecting to the ground

J4 Fault alarm port of the DC surge protector, connected to DC_SPD

on the monitoring backplane

TP48300/A-N07A3




14

AC Detection Board

The AC detection board is used to detect the AC input voltage.

Figure 3-8 AC detection board

Table 3-4 Ports on the AC detection board

Port Description

J1 1 Used to connect to phase N

2 Reserved

3 Reserved

4 Used to connect to phase L1

J2 Used to report the AC voltage by connecting to the AC port on the

monitoring backplane

J3 Reserved

BAT Reserved

PSU

The PSU converts AC power into DC power. Figure 3-9 shows a PSU panel.

TP48300/A-N07A3




15

Figure 3-9 PSU panel

(1) Run indicator (2) Protection indicator (3) Fault indicator

Table 3-5 Indicators on a PSU

Indicator Indicator Color

Normal Status

Abnormal Status

Exception Cause

Run

indicator

Green Steady on Off The mains supply fails due to

AC absence, AC input

overvoltage, or AC input

undervoltage.The PSU has

no output.

Protection

indicator

Yellow Off Steady on A temperature prewarning is

generated when the ambient

temperature exceeds 65°C

(149°F) but is below the

overtemperature threshold.

When the PSU enters the

hibernation mode, the

Protection indicator is steady

on and the PSU does not

report any alarms.

ALM

indicator

Red Off Steady on The PSU has no power output

due to output overvoltage

shutdown, fan faults,

overtemperature shutdown, or

internal PSU faults. (If the PSU

has no power output due to a

mains supply failure such as AC

input absence, AC input

overvoltage, or AC input

undervoltage, the Fault indicator

is off.)

TP48300/A-N07A3

Maintenance Guide 4 Routine Maintenance



16

4 Routine Maintenance

Routine maintenance

The TP48300/A-N07A3 is maintained every six months. If faults are identified, rectify them

immediately.

Table 4-1 Routine maintenance checklist

Maintenance Item

Maintenance Task

Check Whether

Check Method

Repair When Measures

Electricity The voltage

output is

normal.

Using a

multimeter

The battery low

voltage

disconnection

(BLVD)

voltage or load

low voltage

disconnection

(LLVD) voltage

exceeds the

threshold.

For details

about how to

rectify the fault,

See chapter 5

"Troubleshootin

g the

TP48300/A-N0

7A3."

Preventive

maintenance

inspection

(PMI)

Indicators are in

normal status.

Observing

indicators

Fault alarms are

generated.

Cabinet

appearance

The paint and

the

electroplated

coating on the

surface of the

cabinet are in

good condition.

Observing the

cabinet

The cabinet

surface is

damaged or

distorted.

Repaint and

repair the

cabinet.

TP48300/A-N07A3




17

Remote Software Upgrade

When the TP48300/A-N07A3 is used a Simple Network Management Protocol (SNMP)

module, you can upgrade software of the TP48300/A-N07A3 remotely on the NetEcoV1.2

network management UI. For details about the NetEco, See the NetEco Help. To upgrade

software remotely, perform the following steps:

Step 1 Upload the target version file of the controller from a PC to the server.

Choose Software > Software Browser.

On the Software Browser tab page, click Transfer and then click From Client to Server…

In the Select Software File dialog box, click Select.

Select the save path for the target version file of the controller on the PC, and then click OK.

In the Select Software File dialog box, click Confirm. Then the system starts transferring the

target version file.

Step 2 View the progress for transferring the target version file of the controller.

Choose Software > Software Browser in the NetEco main window.

On the Software Browser tab page, click the Server tab. Then you can view the progress for

transferring the target version file of the controller in the lower part of the tab page.

Step 3 Create a task for upgrading the controller software.

Choose Software > Upgrade Task Management in the NetEco main window.

On the Upgrade Task Management tab page, click Create.

In the Site Upgrade Wizard dialog box, enter a task name in Task Name and set Upgrade

Type to Upgrade Version.

Choose the home site of the controller to be upgraded in the navigation tree. Click to

add the site to the list shown in the following figure on the right. Then click Next.

TP48300/A-N07A3




18

Check that the home site and target version of the controller are correct. Click Finish to start

the upgrade.

Step 4 View the progress for upgrading the controller software.

Choose Software > Upgrade Task Management in the NetEco main window.

On the Upgrade Task Management tab page, click Controller in the navigation tree. Then

you can view the progress of all current tasks in the right pane.

TP48300/A-N07A3




19

Step 5 Verify whether the upgrade is successful.

Choose Software > Software Browser in the NetEco main window.

On the Software Bowser tab page, click the Site tab and select the home site of the target

controller.

On the Version tab page on the right of the Site tab page, you can view the current software

version of the controller.

----End

TP48300/A-N07A3

Maintenance Guide 5 Troubleshooting the TP48300/A-N07A3



20

5 Troubleshooting the TP48300/A-N07A3

The symptoms and troubleshooting measures of TP48300/A-N07A3 is shown in Table 5-1.

Table 5-1 Troubleshooting the TP48300/A-N07A3

Category Exception Cause Measures

AC out of phase The AC input

cable is faulty.

The mains

supply or D.G.

fails.

Check whether the AC input cable is

connected properly. If it is not connected

properly, reconnect it. If the insulation layer

deteriorates, replace the AC input cable.

Use a multimeter to check whether the AC

input voltage is over low and whether an AC

undervoltage alarm (lower than 180 V AC) is

generated. If yes, check whether short circuits

occur in the AC input loop and whether

electrical leakage occurs. If a short circuit or

electrical leakage occurs, replace the AC

input cable.

If the mains supply provides the AC power,

contact the mains supplier. If the D.G.

provides the AC power, check and repair the

D.G. by referring to the D.G. User Manual.

TP48300/A-N07A3




21


AC power

failure

The AC input

cable is faulty.

The mains

supply or D.G.

fails.

Check whether the AC input cable is

connected properly. If it is not connected

properly, reconnect it.

Check whether the AC power is available. If

the AC power is unavailable, check whether

an open or a short circuit occurs in the AC

input loop. If the AC power is available and

no open or short circuit occurs, contact the

mains supplier. If the D.G. provides the AC

power, check and repair the D.G. by referring

to the D.G. User Manual.

If the AC power is available, check whether

the AC detection cable is connected properly.

Figure 5-1 shows the correct position of the

AC detection cable.

If the AC detection cable is connected

properly, replace the AC detection board.

If the power failure does not last long, use

storage batteries to power DC-powered loads.

If the power failure lasts long, use another

power supply.

AC overvoltage

or undervoltage

The alarm

threshold for

AC overvoltage

or undervoltage

is not properly

set on the PMU.

The mains

supply or D.G.

fails.

Check whether the AC overvoltage and

undervoltage alarm thresholds are properly

set on the PMU. If no, adjust them as

required.

If the mains supply provides the AC power,

contact the mains supplier. If the D.G.

provides the AC power, check and repair the

D.G. by referring to the D.G. User Manual.

DC overvoltage

or undervoltage

The alarm

threshold for

DC overvoltage

or undervoltage

is not properly

set on the PMU.

Check whether the DC overvoltage and

undervoltage alarm thresholds are properly

set on the PMU. If no, adjust them as

required.

Reseat all PSUs one by one and replace faulty

ones.

Overcurrent

charge

The charging

parameters are

not properly set

on the PMU.

The load loop

or battery loop

is faulty.

Check the charging parameters on the PMU

and reset those that are not properly set.

Check whether the communications cable

between the PSU and the monitoring

backplane of the power system is connected

properly. If yes, reseat the PSU.

Check whether faults such as short circuits

occur in the battery loop. If faults occur,

rectify them.

Check the storage batteries and replace faulty

ones.

TP48300/A-N07A3




22


Load

disconnection

The contactor is

faulty.

The PMU load

disconnection

voltage is

overhigh.

The load power

is greater than

the maximum

value

configured for

the PSU, and

this causes low

output voltage.

Check whether the contactor is faulty and

whether the contactor cannot be connected or

disconnected. If the contactor is faulty or the

contactor cannot be connected or

disconnected, replace the contactor.

Check whether the LLVD voltage is

overhigh. If it is overhigh, adjust the voltage

to the normal range.

Check whether the load power is greater than

the configured PSU power. If yes, add PSUs

and reset the number of PSUs on the PMU.

Then switch the circuit breakers for the newly

added PSUs in the ON position. If the load

power exceeds the maximum power of the

TP48300/A-N07A3, decrease the load power.

Battery

disconnection

The battery

parameters are

not properly set

on the PMU.

The contactor is

faulty.

Check whether the mains supply fails and

whether the battery voltage is below the

BLVD threshold. If the mains supply fails or

the battery voltage is below the BLVD

threshold, contact the mains supplier.

Check that BLVD is enabled on the PMU.

Check the battery cables and connectors, and

replace faulty ones.



disconnected. If the contactor is faulty or

cannot be connected or disconnected, replace

the contactor.

Battery loop

broken

The battery

loop is faulty.

The contactor is

faulty.

Storage

batteries are

faulty.

Check the battery cables and connectors, and

replace faulty ones.



disconnected. If the contactor is faulty or

cannot be connected or disconnected, replace

the contactor.

Check the storage batteries and replace faulty

ones.

TP48300/A-N07A3




23


Overhigh or over

low ambient

temperature

The alarm

threshold for

ambient

temperatures is

not properly set

on the PMU.

The

temperature

inside the

shelter where

the ambient

temperature

sensor is

installed is not

in the normal

range.

The battery

temperature

sensor is faulty.

Check that the alarm threshold for ambient

temperatures is properly set on the PMU.

Check the temperature control system in the

shelter and repair it if necessary. After the

temperature inside the cabinet is adjusted to

the specified range, the alarm is automatically

cleared.

If the alarm persists, repair the temperature

sensor.

Faulty ambient

temperature

sensor

The sensor is

not connected

properly.

The battery

temperature

sensor is faulty.

The UIM is

faulty.

Check whether the signal cable is properly

connected to the UIM. If no, fasten or replace

the signal cable.

If the cable is connected properly but the

sensor is faulty, replace the sensor.

If the alarm persists, replace the UIM.

Faulty battery

temperature

sensor

Overhigh or over

low ambient

humidity

The alarm

threshold for

ambient

humidity is not

set properly on

the PMU.

The humidity

inside the

shelter that

houses the

humidity sensor

is not in the

normal range.

The humidity

sensor is faulty.

Check that the alarm threshold for ambient

humidity is properly set on the PMU.

Check the shelter for water intrusion. If there

is water in the shelter, remove the water using

a dry cotton cloth or dehumidifier.

If the humidity in the cabinet is adjusted to

the specified range but the alarm persists,

check and repair the humidity sensor.

TP48300/A-N07A3




24


Faulty ambient

humidity sensor

The sensor is

not connected

properly.

The humidity

sensor is faulty.

The monitoring

backplane is

faulty.

Check whether the signal cable is properly

connected to the monitoring backplane. If no,

fasten or replace the signal cable.

If the cable is connected properly but the

sensor is faulty, replace the sensor.

If the alarm persists, replace the monitoring

backplane.

Overhigh or over

low battery

temperature

The battery

cabinet is under

an

overtemperature

condition.

The alarm

threshold for

battery

temperatures is

not properly set

on the PMU.

The charge

current of

storage batteries

is overhigh.

The battery

temperature

sensor is faulty.

Check that the alarm threshold for battery

temperatures is properly set on the PMU.

Check whether the temperature inside the

battery cabinet is overhigh. If it is, lower the

temperature inside the battery cabinet. The

alarm is automatically cleared after the

temperature lowers to the proper range.

Check the charge current. If the charge

current is overhigh, change the charge mode

from boost charge to floating charge and

check whether the charge current lowers. If

the charge current is still overhigh, reduce the

charge current. If the overtemperature

condition persists, check the storage batteries

and replace faulty ones.

Door status

sensor alarm

The cabinet

door is open.

The door status

sensor is faulty.

The monitoring

backplane is

faulty.

Close the cabinet door.

If the alarm persists after the cabinet door is

closed, check and repair the door status

sensor.

If the door status sensor is not faulty, replace

the monitoring backplane.

Water detector

alarm

There is water

in the shelter.

The water

sensor is faulty.

The monitoring

backplane is

faulty.

Check the shelter for water intrusion. If there

is water in the shelter, remove the water using

a dry cotton cloth or dehumidifier.

If the alarm persists after the water is

removed, check and repair the water sensor.

If the water sensor is not faulty, replace the

monitoring backplane.

TP48300/A-N07A3




25


Smoke sensor

alarm

There is smoke

in the shelter.

The smoke

sensor is faulty.

The monitoring

backplane is

faulty.

Check the shelter for smoke. If there is

smoke, put out the fire immediately and open

the shelter door for ventilation. Then reseat

the smoke sensor and the alarm disappears.

If there is no smoke but this alarm persists,

check and repair the smoke sensor.

If the smoke sensor is not faulty, replace the

monitoring backplane.

PSU fault The PSU has

poor contact

with the

subrack.

The PSU is

faulty.

Check the fault indicator on the PSU panel. If

the indicator is blinking red, the PSU is

faulty. Then replace the PSU.

Disconnect the AC power from the PSU, and

then restart the PSU after a period of time. If

the alarm persists, replace the PSU.

PSU shutdown

PSU protection

The input

voltage to the

PSU is not in

the normal

range.

A fault occurs

on the PSU.

Check whether the mains supply voltage is

higher than the PSU AC overvoltage

threshold (300 V) or lower than the PSU AC

undervoltage threshold (85 V). If the power

grid is in an overvoltage or undervoltage

condition for a long period of time, contact

the mains supplier to improve the power grid.

If the input voltage to the PSU is within the

specified range but this alarm persists, replace

the PSU.

Communication

failure between

the PSU and the

PMU

The signal cable

to the PSU is

not connected

properly.

The PSU is not

installed in the

subrack.

The PSU has

poor contact

with the

subrack.

A fault occurs

on the PSU.

The monitoring

backplane is

faulty.

Check whether the PSU is installed in the

subrack and whether the PSU is properly

connected. If the PSU is not installed in the

subrack, install the PSU in the correct

position. If the PSU has poor contact with the

subrack, reseat the PSU, and ensure that the

PSU is secured to the subrack.

Check whether the communications cable is

properly connected between the PSU and the

monitoring backplane. If yes, reseat the PSU.

If the alarm persists, replace the PSU.

If the alarm still persists after the PSU is

replaced, replace the monitoring backplane.

TP48300/A-N07A3




26


D.G. fault The signal cable

to the D.G. is

not connected

properly.

D.G.

parameters are

incorrectly set

on the PMU.

The D.G. is

faulty.

Check that the signal cable to the D.G. is

connected properly.

Check whether D.G. startup is disabled on the

PMU and whether the D.G. has been started

manually. If D.G. startup is disabled and the

D.G. has been started manually, shut down

the D.G. Then the D.G. fault alarm is cleared.

Check whether the D.G. is faulty. If it is

faulty, repair the D.G. by referring to the D.G.

User Manual.

Load fuse blown The load fuse is

faulty.

The load circuit

breaker is in the

OFF position.

Check whether the load circuit breaker is in

the OFF position. If it is, switch it to the ON

position.

If the circuit breaker is to the ON position ,

the alarm still exists, check whether the load

fuse is damaged. Use a multimeter to measure

the voltage at both ends of the fuse. If the

voltage is close to 0 V, the fuse is normal.

Otherwise, the fuse is blown. Replace the

fuse.

If the alarm persists after the fuse is replaced,

check the new fuse. If the new fuse is blown

or the load circuit breaker is automatically

switched to the OFF position, the load power

on this route may be excessive or a short

circuit may occur. In this case, you need to

rectify the fault on this load loop. If the new

fuse functions normally, the alarm loop is

faulty. Then replace the PMU.

Faulty AC SPD The AC SPD is

faulty.

The monitoring

backplane is

faulty.

Observe the indication window on the AC

surge protection module. If it turns red,

replace the surge protection module. If it does

not turn red, then check whether the detection

cable to AC SPD is connected well (the

detection cable to AC SPD is shown in Figure

5-2), if it doesn’t connect well, then replace

the detection cable. If the cable is ok, then the

alarm loop in the PMU is faulty. Then replace

the PMU.

If the alarm persists, replace the monitoring

backplane.

TP48300/A-N07A3




27


Faulty DC SPD The DC SPD is

faulty.

Check whether the cable for detecting the DC

surge protection board fault is connected

properly and whether the cable is damaged or

cracked. If yes, replace the detection cable

(the position of the cable for detecting the DC

surge protection board fault is shown in

Figure 7-5.)

If the cable is properly connected, replace the

DC surge protection board.

If the alarm persists after the DC surge

protection board is replaced, replace the

PMU. If the alarm still persists, replace the

UIM.

TP48300/A-N07A3




28

If the customer does not require the TP48300/A-N07A3 to be managed in in-band mode, do not

connect the TP48300/A-N07A3 and the base band unit (BBU) with an Ethernet cable or an RJ45

communications cable. If the customer requires the TP48300/A-N07A3 to be managed in in-band

mode, set the capacity of storage batteries on the EMS.

After a fault is rectified, the corresponding alarm is automatically cleared on the PMU and the alarm

information is stored in the alarm history.

The BLVD fuse and LLVD fuse are both called load fuse.

Disconnect the fuse before replacing it. Otherwise, arc sparks may be generated, and this may cause

bodily injury.

After replacing the PMU, reset parameters by referring to the TP48300/A-N07A3 Quick Installation

Guide.

The PMU and PSUs are hot-swappable.

When replacing the monitoring board, take ESD measures such as wearing an ESD wrist wrap.

Figure 5-1 Detection cables to AC power

Figure 5-2 Detection cables to AC SPD

TP48300/A-N07A3

Maintenance Guide 6 Troubleshooting Components



29

6 Troubleshooting Components

This chapter describes how to troubleshoot the components of TP48300/A-N07A3.

AC SPD

Observe the indication window on the surge protection module. If the indication window

turns red, the surge protection module is damaged. In this case, replace the surge protection

module. If the indication window remains green, the SPD runs properly.

Fuse

Check whether the input voltage is the same as the output voltage. If they are different, the

fuse is damaged.

Circuit Breaker

The circuit breaker fault is usually caused by overcurrent or short circuits. Circuit breaker

faults are caused by overcurrent or short circuits. To check whether a circuit break is faulty,

perform the following steps:

Step 1 Switch the circuit breaker to the ON position.

Step 2 Measure the resistance at the two ends of the circuit breaker using a multimeter. If the

resistance is infinity, the circuit breaker is damaged.

TP48300/A-N07A3




30

DC Contactor

Table 6-1 DC contactor description

Position Type Check Method

LLVD route

BLVD route

Normally closed (NC)

(When the contactor is

powered off, the contactor is

closed.)

When there is no voltage on the control

pin of the contactor, use a mulitmeter

to check whether the output pin is in

normal status. For example, if pins 1

and 2 shown in Figure 6-1 have no

voltage, use a multimeter to check the

connection status between pins 3 and 4.

If pins 3 and 4 are disconnected, the

contactor is faulty.

When there is a rated control voltage

on the control pin of the contactor, use

a mulitmeter to check whether the

output pin status of the contactor is

normal. For example, if pins 1 and 2

shown in Figure 6-1 have a rated

control voltage, use a multimeter to

check the connection status between

pins 3 and 4. If pins 3 and 4 are

connected, the contactor is faulty.

Battery route

(battery fuse

or circuit

breaker route)

Normally open (NO) (When

the contactor is powered off,

the contactor is open.)

When there is no voltage on the control

pin of the contactor, use a mulitmeter

to check whether the output pin of the

contactor is in normal status. For

example, if pins 1 and 2 shown in

Figure 6-1 have no voltage, use a

multimeter to check the connection

status between pins 3 and 4. If pins 3

and 4 are connected, the contactor is

faulty.

When there is a rated control voltage

on the control pin of the contactor, use

a mulitmeter to check whether the

output pin status of the contactor is

normal. For example, if pins 1 and 2

shown in Figure 6-1 have a rated

control voltage, use a multimeter to

check the connection status between

pins 3 and 4. If pins 3 and 4 are

disconnected, the contactor is faulty.

TP48300/A-N07A3




31

Figure 6-1 DC contactor

PSU

The PSU is damaged if either of the following conditions is not met:

The Run indicator of the PSU is steady on and the Fault indicator is off when the PSU

does not communicate with the PMU and the input AC voltage is around 220 V. The

PSU outputs power normally.

The PMU can perform control on the charge mode (boost charge or floating charge) and

current for the PSU when the PSU communications cable is properly connected and the

PSU communicates with the PMU normally.

PMU

If any of the following occurs, the PMU is faulty:

The PMU breaks down or fails to start, or its LCD or keyboard fails.

The PMU does not generate an alarm when a fault occurs in the system.

The PMU generates an alarm (false alarm) when the system runs properly.

Communication between the PMU and all subordinate equipment is interrupted.

The PMU fails to control or monitor all the modules when these modules run properly

and communications cables are connected properly.

The PMU fails to monitor or control AC or DC distribution when AC/DC power is

distributed normally and communications cables are connected properly.

Parameters cannot be set or operating information cannot be viewed on the PMU.

AC Detection Board

To check whether an AC detection board (the PW31ACDA is used as an example) is faulty,

perform the following steps:

Step 1 Remove the power subrack cover plate and protection cover plate of the PW31ACDA using a

Phillips screwdriver.

Step 2 Turn the multimeter to the AC range. Measure the phase A AC input of the J1 port (pins 1 and

4) on the PW31ACDA. Remove the cable from the J2 port (pins 1 and 5 from the right), wrap

the connector using ESD tape, and measure the small AC signal sent from the J2 port to the

monitoring backplane. According to the following formula, when the phase A AC input

TP48300/A-N07A3




32

voltage on the J1 port is 220 V, the phase A small AC signal must be about 280 mV. If the

small AC signal is inexact, the AC detection board is faulty.

Phase small A AC signal = Phase A AC input x 510/400 K

DC Surge Protection Board

To check whether a DC surge protection board (the WD22DLPB is used as an example) is

faulty, perform the following steps:

Step 1 Switch the AC circuit breaker to the OFF position and switch to the battery loop.

Step 2 Remove the cover on the back of the cabinet and find the DC surge protection board.

1. Turn the multimeter to the diode range to check whether a short circuit occurs between

the two pins at the J4 port. You can remove the DC surge protection board for easy

measurement.

2. Label the cables to the DC surge protection board.

3. Remove the cables.

4. Loosen the screws on the DC surge protection board and remove the DC surge protection

board.

Step 3 If the DC surge protection board needs to be repaired, locate the fault further.Check whether

fuses F1, F2, and F3 are blown. If F1 is blown, check whether short circuits occur on the RV1

varistor or RV2 varistor. If either varistor is short-circuited, the varistor fails. If F2 is blown,

check whether the RV3 varistor or RV4 varistor is short-circuited. If F3 is blown, check

whether the RV5 varistor or RV6 varistor is short-circuited. Replace faulty components and

ensure that all faults are rectified.

----End

Monitoring Signal Transfer Board

This section describes how to check whether a DC surge protection board (the PW31OMIC is

used as an example) is faulty.

The PW31PMIC implements functions of surge protection and signal transfer. The

PW31PMIC is damaged mainly because of lightning strikes or short circuits. Ensure that all

plugs on the PW31PMIC are properly and reliably installed. The following lists main faults of

the PW31PMIC:

The busbar voltage input is abnormal.

Step 1 Check whether the busbar voltage is normal.

Step 2 If the busbar voltage is abnormal, check whether the busbar is faulty.

Step 3 If the busbar is running properly, pull out the J3 plug and use a multimeter to check whether

the voltage between pin 1 and pin 4 is equal to the busbar voltage. If no, the J3 input cable is

faulty. If yes, reseat the J3 plug, remove the CPMU01, and check whether there is voltage

output at the J2 port on the backplane by performing the following steps:

1. Insert a metal wire into the 1PIN in the middle and the 1PIN on the side respectively and

route the metal wires out to check whether the voltage is normal.

TP48300/A-N07A3




33

2. Take care to avoid that the two metal wires are short circuited or that they are in contact

with the shell. If there is no voltage output at the J2 port, pull out the CPMU01 and

remove the backplane.

3. Check whether the printed circuit board (PCB) copper sheet on the two sides of the

backplane is burnt or bulges occur inside the PCB.

----End

The diodes on the backplane are abnormal.

Pull out the CPMU01 and remove the backplane. Set the multimeter to the diode gear to

check whether a short circuit occurs on the backplane by performing the following steps.

Step 1 Measure the two polarities of the diode using the leads of a mulitimeter.

Step 2 Measure the two polarities of the diode again by changing the position of the leads.

Step 3 If the multimeter buzzes for both times, the diodes are damaged.Check the following diodes:

D6, D22 to D29, D33, D36, D43 to D51, and D55 to D62.

The positive temperature coefficient (PTC) thermisistors on the monitoring backplane

are abnormal.

Pull out the CPMU01 and remove the monitoring backplane. Set the multimeter to the

diode range and check whether short circuits occur on the RT1, RT2, RT3, or RT4. If yes,

the PTC thermisistor is damaged.

The varistor and the gas discharge tube on the backplane are abnormal.

Pull out the CPMU01 and remove the backplane. For details, see the corresponding

sections in this chapter.

TP48300/A-N07A3

Maintenance Guide 7 Parts Replacement



34

7 Parts Replacement

This chapter describes how to replace the main components of the TP48300/A-N07A3.

NOTE Ensure that loads are supplied with power during the replacement. For example, keep the circuit

breakers for primary loads in the ON position, and avoid the situation where both storage battery

input and AC input are disconnected from the loads to be replaced.

If load disconnection is indeed required, seek the customer's prior consent.

The PMU and PSUs are hot-swappable.

For details about safety precautions, see chapter 1 "Safety Precautions."

Replacing a PSU

To replace a PSU, perform the following steps:

Step 1 Unscrew the PSU panel by using a flat-head screwdriver.

Step 2 Gently pull the handle of the PSU outwards, and then remove the PSU from the subrack, as

shown in Figure 7-1.

Figure 7-1 Removing a PSU

Step 3 Insert a new PSU into the corresponding subrack. Then, loosen the screws on the handle and

pull out the handle.

Step 4 Slide the PSU into the subrack along the guide rail. Then lock the handle.

Step 5 Tighten the screws on the handle, as shown in Figure 7-2.

TP48300/A-N07A3




35

Figure 7-2 Installing a PSU

----End

Replacing the PMU

To replace the PMU, perform the following steps:

Step 1 Unscrew the PMU panel using a Phillips screwdriver.

Step 2 Remove the old PMU.

Step 3 Insert a new PMU.

Step 4 Tighten the screws on the handle.

Step 5 Set parameters on the PMU panel.

----End

Figure 7-3 Replacing the PMU

Replacing the AC Surge Protection ModuleTo replace the AC surge protection module, perform

the following steps:

Step 1 Remove the AC surge protection module.

Step 2 Insert a new AC surge protection module.

TP48300/A-N07A3




36

Figure 7-4 Replacing an AC surge protection module

----End

Replacing the DC Surge Protection Board

The DC surge protection board can be found when the cabinet cover is opened, as shown in

Figure 7-5.

Figure 7-5 DC Surge Protection Board

To replace a DC surge protection board, perform the following steps:

Step 1 Switch the AC circuit breaker to the OFF position and switch to the battery loop.

Step 2 Remove the cover plate from the back of the cabinet and find the DC surge protection board

in the middle.

Step 3 Label the cables on the DC surge protection board and remove the cables.

Step 4 Loosen the screws on the DC surge protection board using a Phillips screwdriver and remove

the DC surge protection board.

TP48300/A-N07A3




37

Step 5 Install a new DC surge protection board and secure it.

Step 6 Connect the cables to the DC surge protection board.

Step 7 Power on the DC surge protection board after the side cover is closed.

----End

Replacing the Monitoring Signal Transfer Board

The monitoring signal transfer board is behind the PMU and is covered by a cover plate, as


Figure 7-6 Monitoring signal transfer board

To replace the monitoring signal transfer board, perform the following steps:

Step 1 Remove the PMU.

Step 2 Remove the power subrack cover plate using a Phillips screwdriver.

Step 3 Label the cables on the monitoring signal transfer board and remove the cables.

Step 4 Remove the screws on the monitoring signal transfer board using a Phillips screwdriver and

remove the monitoring signal transfer board.

Step 5 Install a new monitoring signal transfer board and secure it.

Step 6 Reinstall the cables as original.

Step 7 Reinsert the PMU and tighten the screws.

Step 8 Reinstall the power subrack plate and tighten the screws.

----End

Replacing a Fuse

To replace a fuse, perform the following steps:

Step 1 Disconnect the fuse loop.

TP48300/A-N07A3




38

Step 2 Remove the damaged fuse using a fuse extracting unit, as shown in Figure 7-7.Removing a

fuse

Step 3 Install a new fuse, as shown in Figure 7-8.Installing a fuse

Step 4 Connect the fuse loop.

----End

Replacing the AC Detection Board

The AC detection board is beside the monitoring module. The AC detection board can be seen

when the power subrack cover plate and the protection cover plate of the AC detection board

are removed, as shown in Figure 7-9.

Figure 7-9 Position of the AC detection board

TP48300/A-N07A3




39

To replace the AC detection board, perform the following steps:

Step 1 Switch the AC input circuit breaker to the OFF position.

Step 2 Remove the power subrack cover plate and protection cover plate of the AC detection board

using a Phillips screwdriver.

Step 3 Label the cables on the AC detection board and remove the cables.

Step 4 Loosen the screws on the AC detection board using a Phillips screwdriver and remove the AC

detection board.

Step 5 Install a new AC detection board and secure it.

Step 6 Connect the cables as original.

Step 7 Reinstall the protection cover plate and power subrack cover plate and tighten the screws.

----End

Replacing a Circuit Breaker

To replace a circuit breaker, perform the following steps:

Step 1 Disconnect the power supply of a circuit breaker. For example, disconnect the DC input and

switch the circuit breaker to the OFF position before replacing an input circuit breaker.

Step 2 Remove the cables or copper bars connected to the circuit breaker using a Phillips screwdriver,

and then wrap the cables or copper bars using PVC insulation tape to avoid hazards.

Step 3 Press the contact plate at the bottom of the circuit breaker using a flat-head screwdriver. Then

remove the circuit breaker, as shown in Figure 7-10.

Figure 7-10 Removing a circuit breaker

Step 4 Press the contact plate at the bottom of the circuit breaker using a flat-head screwdriver again

to install a new circuit breaker to the correct position. Then push the contact plate upwards

using the screwdriver.

Step 5 Use a Phillips screwdriver to install the cables or copper bars as they were installed.

Step 6 Switch the circuit breaker to ON position and connect power supply of the circuit breaker, as


TP48300/A-N07A3




40

Figure 7-11 Installing a circuit breaker

----End

TP48300/A-N07A3

Maintenance Guide A Appendix



41

A Appendix

Figure A-1 shows the menu hierarchy (to the secondary level) on the LCD screen.

Figure A-1 Menu hierarchy (to the secondary level) on the LCD screen

Table A-1 lists menu items on the LCD screen.

Table A-1 Menu items on the LCD screen

Main Menu

Second Menu

Third Menu Forth Menu Fifth Menu

Default Value

Status Rectifiers Rectifiers ID ID - -

Load - -

TP48300/A-N07A3




42

Main Menu

Second Menu


Default Value

Current - -

Current limit - -

Status - -

Output power - -

Rated

efficiency - -

Input power - -

Input current - -

Rated current - -

Inner

temperature - -

Active alarm Critical Alarm - - -

Major Alarm

History

alarm - - - -

Battery test

result - - - -

Version

display - - - -

Generator

status

Generator 1/2 - -

Mainten

anace

Management

mode - - - -

Start - - - -

Rectifier ID - - - -

Settings System

settings

Address - - 0

Text - - -

Communication

mode

- RS232

Baud - - 9600

Date - -

Time - -

TP48300/A-N07A3




43

Main Menu

Second Menu


Default Value

Battery 2 shunt - - No

Display

contrast - - 3

System type - TP48300/A-N07

A3

IP address - - 192.168.0.1

Subnet mask - - 255.255.254.0

Gateway - - 10.70.199.1

Server port - - 31220

Server IP

address 1 - - 192.168.0.1

Server IP

address 2 - - 192.168.0.2

Engineering

settings

Modify

Password - None

Initial

parameter - No

Rectifier

sleep - Yes

Rectifier

exchange

sleep

- 7days

Rectifier

Minimum

number ON

- 1pieces

Best

efficiency

point

- 70%

Fast charge - No

Alarm

settings

Alarm level Alarm -

Level -

Digital alarm DI No. -

Mode -

Set DI name -

TP48300/A-N07A3




44

Main Menu

Second Menu


Default Value

Alarm control Audible

alarm - Yes

Clear history

alarm - No

Relay relate Alarm -

Relate relay -

AC settings Over voltage - - 280V

Under voltage - - 180V

State measure - - Yes

DC settings Over voltage - - 58V

Under voltage - - 45V

Battery

settings

Battery

selection

Battery string - 1

Capacitor 1 - 400AH

Capacitor 2 - 0

Install date - 2001-01-01

LVD settings LLVD enable - Yes

BLVD

enable - Yes

LLVD - 44V

BLVD - 43V

Charge Float 53.5V

Boost 56.5V

Cycle BC

duration

60days

Current limit 0.10C10

Battery test Auto test Auto

test

enable

Discharge test

Cycle 120days

Test end

voltage

1.9V

Duration 10hours

TP48300/A-N07A3




45

Main Menu

Second Menu


Default Value

Test

delay

14days

Short test Test end

voltage

45V

Duration 60minutes

Temperature co

efficiency

Temp

compensation

basis

- Batt1

Temperature

compensation - 80mV/℃

BHTD

enable - No

BHTD

temperature - 53℃

Low

temperature

alarm

- 0℃

High

temperature

alarm

- 50℃

Upper limit - 80℃

Lower limit - -20℃

Ambient

settings

Upper limit - - 80℃

Lower limit - - -20℃

High alarm - - 50℃

Low alarm - - 0℃

Generator Generator

enable - - No

Output power - - 12.5kW

Discharge

depth - - 30%

Temperature

OFF enable - - Yes

Start

temperature - - 45℃

TP48300/A-N07A3




46

Main Menu

Second Menu


Default Value

OFF

temperature - - 29℃

Air-condition Type - - Single-phase

Power - - 1.0 kW

TP48300/A-N07A3

Maintenance Guide B Acronyms and Abbreviations



47

B Acronyms and Abbreviations

A

AC alternating current

ASIC application-specific integrated circuit

B

BLVD battery low voltage disconnection

D

DC direct current

E

EMS element management system

ESD electrostatic discharge

F

FOA first office application

L

LCD liquid crystal display

LLVD load low voltage disconnection

LSI large-scale integrated

N

TP48300/A-N07A3

Maintenance Guide B Acronyms and Abbreviations



48

NC normally closed

NO normally open

O

P

PCB printed circuit board

PMI preventive maintenance inspection

PMU power monitoring unit

PSU power supply unit

S

SELV safety extra-low voltage

SNMP Simple Network Management Protocol

SPD surge protection device

T

TNV telecommunication network voltage

U

UIM user interface module

tp48300-a-n07a3 maintenance guide ( v100r001_04) (2)

Documents

huawei trademarks

document issues

huawei proprietary

latest document issue

huawei industrial base

additional information

symbol description

port description