Rectifier PS4890 Description

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PS4890

V200R103

User Guide

Issue 04

Date 2012-04-30

HUAWEI TECHNOLOGIES CO., LTD.


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Copyright Huawei Technologies Co., Ltd. 2012. 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 the 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]

Issue 04 (2012-04-30) Huawei Proprietary and Confidential

Copyright Huawei Technologies Co., Ltd.

i
http://www.huawei.com/


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About This Document

Purpose

This document describes the PS4890 in terms of the features, components, cables, and

maintenance.

Product Versions

The following table lists the product version related to this document.

Product Name Product Version

PS4890 V200R103

Intended Audience

This document is intended for:

l Field engineers

l Base station installers

l System engineers

Organization1 Changes in the PS4890 User Guide

This chapter describes the changes in thePS4890 User Guide.

2 Overview of the PS4890

The PS4890, an indoor power cabinet, provides DC power and space for customer equipment.

When installed with battery groups, the PS4890 can also provide power backup.

3 Introduction to the PS4890

This describes the exterior, structure, components, and cables of the PS4890.

4 Cable Connections of the PS4890

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The cable connections of the PS4890 vary depending on the type of battery group configured in

the PS4890 cabinet.

5 Maintenance of the PS4890

This describes the maintenance items for the PS4890. The maintenance items are the PMU, PSU,DCDU-04, and DCDU-03.

Conventions

Symbol Conventions

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

Symbol Description

Indicates a hazard with a high level of risk, which if not

avoided, will result in death or serious injury.

Indicates a hazard with a medium or low level of risk, which

if not avoided, could result in minor or moderate injury.

Indicates a potentially hazardous situation, which if not

avoided, could result in equipment damage, data loss,

performance degradation, or unexpected results.

Indicates a tip that may help you solve a problem or save

time.

Provides additional information to emphasize or supplement

important points of the main text.

General Conventions

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

Convention Description

Times New Roman Normal paragraphs are in Times New Roman.

Boldface Names of files, directories, folders, and users are in

boldface. For example, log in as user root.

Italic Book titles are in italics.

Courier New Examples of information displayed on the screen are in

Courier New.

Command Conventions

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

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Boldface The keywords of a command line are in boldface.

Italic Command arguments are in italics.

[ ] Items (keywords or arguments) in brackets [ ] are optional.

{ x | y | ... } Optional items are grouped in braces and separated by

vertical bars. One item is selected.

[ x | y | ... ] Optional items are grouped in brackets and separated by

vertical bars. One item is selected or no item is selected.

{ x | y | ... }* Optional items are grouped in braces and separated by

vertical bars. A minimum of one item or a maximum of all

items can be selected.

[ x | y | ... ]* Optional items are grouped in brackets and separated byvertical bars. Several items or no item can be selected.

GUI Conventions

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


Boldface Buttons, menus, parameters, tabs, window, and dialog titles

are in boldface. For example, click OK.

> Multi-level menus are in boldfaceand separated by the ">"

signs. For example, choose File> Create> Folder.

Keyboard Operations

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

Format Description

Key Press the key. For example, press Enterand press Tab.

Key 1+Key 2 Press the keys concurrently. For example, pressing Ctrl+Alt

+Ameans the three keys should be pressed concurrently.

Key 1, Key 2 Press the keys in turn. For example, pressing Alt, Ameans

the two keys should be pressed in turn.

Mouse Operations

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

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Action Description

Click Select and release the primary mouse button without moving

the pointer.

Double-click Press the primary mouse button twice continuously andquickly without moving the pointer.

Drag Press and hold the primary mouse button and move the

pointer to a certain position.

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Contents

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

1 Changes in the PS4890 User Guide............................................................................................1

2 Overview of the PS4890................................................................................................................2

2.1 Functions of the PS4890.....................................................................................................................................3

2.2 Application Scenarios of the PS4890.................................................................................................................4

2.3 Technical Specifications of the PS4890.............................................................................................................6

2.3.1 Electrical Specifications............................................................................................................................6

2.3.2 Engineering Specifications........................................................................................................................9

2.3.3 Surge Protection Specifications...............................................................................................................10

2.3.4 Environmental Requirements..................................................................................................................10

3 Introduction to the PS4890.........................................................................................................12

3.1 Exterior of the PS4890.....................................................................................................................................13

3.2 Structure of the PS4890....................................................................................................................................13

3.3 Components......................................................................................................................................................14

3.3.1 Power Equipment (AC/DC).....................................................................................................................14

3.3.2 DCDU-04.................................................................................................................................................21

3.3.3 DCDU-03B/DCDU-03C.........................................................................................................................23

3.3.4 Battery.....................................................................................................................................................26

3.4 Cables...............................................................................................................................................................26

3.4.1 PGND Cable for the Cabinet...................................................................................................................27

3.4.2 PGND Cable for the DCDU-03...............................................................................................................27

3.4.3 PGND Cable for the Power System (AC/DC).........................................................................................283.4.4 Input Power Cable...................................................................................................................................29

3.4.5 Input Power Cable for the DCDU-04......................................................................................................29

3.4.6 Output Power Cable for the DCDU-04...................................................................................................30

3.4.7 Input Power Cable for the DCDU-03......................................................................................................31

3.4.8 Output Power Cable for the DCDU-03...................................................................................................32

3.4.9 Environment Monitoring Signal Cable for the Power Cabinet...............................................................33

3.4.10 Monitoring Signal Cable of the PMU....................................................................................................35

3.4.11 Temperature Monitoring Signal Cable for the Batteries.......................................................................36

3.4.12 Power Cable for the Batteries................................................................................................................37

4 Cable Connections of the PS4890.............................................................................................39

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5 Maintenance of the PS4890........................................................................................................42

5.1 Replacing the PMU..........................................................................................................................................43

5.2 Replacing the PSU (AC/DC)............................................................................................................................44

5.3 Replacing the DCDU-04..................................................................................................................................46

5.4 Replacing the DCDU-03..................................................................................................................................48

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1Changes in the PS4890 User GuideThis chapter describes the changes in thePS4890 User Guide.

04 (2012-04-30)

This is the fourth commercial release.

Compared with issue 03 (2011-03-31), no topic is added.

Compared with issue 03 (2011-03-31), this issue incorporates the following change:

Content Change Description

3.4.11 Temperature Monitoring Signal

Cable for the Batteries

Updated the exterior of temperature

monitoring signal cable for the batteries.

Added notes for cable connection.

Compared with issue 03 (2011-03-31), no topic is deleted.

03 (2011-03-31)

This is the third commercial release.

Compared with issue 02 (2010-06-05), there are some editorial changes.

02 (2010-06-05)

This is the second commercial release.

Compared with issue 01 (2009-06-04), there are some editorial changes.

01 (2009-06-04)

This is the first commercial release.

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2Overview of the PS4890About This Chapter

The PS4890, an indoor power cabinet, provides DC power and space for customer equipment.

When installed with battery groups, the PS4890 can also provide power backup.

2.1 Functions of the PS4890

The PS4890 provides an auxiliary solution for the indoor applications of Huawei wireless

products. It supplies DC power and backup power to the distributed base station or BTS3900.

It can also provide space for installing the BBU and transmission devices indoors.

2.2 Application Scenarios of the PS4890

The PS4890 can work with the BTS3900 or the distributed base station, meeting the requirements

in different scenarios.

2.3 TechnicalSpecifications of the PS4890

The technical specifications of the PS4890 consist of the electrical specifications, engineering

specifications, surge protection specifications, and environment requirements.

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2.1 Functions of the PS4890

The PS4890 provides an auxiliary solution for the indoor applications of Huawei wireless

products. It supplies DC power and backup power to the distributed base station or BTS3900.

It can also provide space for installing the BBU and transmission devices indoors.

Table 2-1describes the functions of the PS4890.

Table 2-1Functions of the PS4890

Item Description

Providing space for

customer equipment

Space available for customer equipment:

l Without built-in batteries: a space of 13 U for customer

equipment.

l With 48 V 92 Ah built-in batteries: a space of 7 U for customer

equipment.

l With 48 V 184 Ah built-in batteries: no space for customer

equipment.

Providing backup

power

Two 48 V 92 Ah batteries can be connected parallel to provide 48

V 184 Ah backup power.

Providing the PSU l The PSU converts the input AC mains into -48 V DC power.

l The PSU is hot-swappable.

Providing the PMU l

The PMU manages the PSUs and the charge and discharge ofthe batteries.

l The PMU provides RS485 communication ports and dry contact

alarm ports for remote and unmanned monitoring.

l The PMU supports the battery low voltage disconnect (BLVD)

and load low voltage disconnect (LLVD) functions.

l The PMU is hot-swappable.

Providing surge

protection for the

power supply and

signal ports

There are surge protection modules for the AC/DC power supply

ports, and surge protection circuits designed for the alarm ports and

communication ports. This ensures reliable surge protection and

inductive surge protection are provided for the PS4890.

Distributing DC power For details, see Table 2-2.

Table 2-2describes the DC power distribution functions of the PS4890.

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Table 2-2DC power distribution functions of the PS4890

DCPowerDistrib

utionUnit

DCOutput

DCPowerSupply

to...

circuit breakerSpecification

circuitbreakerQuantity

Remarks

DCDU-

04

Two

LLVD

outputs

BTS3900

or other

base

stations.

80 A 2 -

DCDU-

03A

Nine

BLVD

outputs

BBU 12 A 1 The 6 A, 12 A, 20 A,

circuit breakers of

the DCDU-03 series

power distribution

boxes should beused in derating

mode. The circuit

breakers can be used

as follows:

l 6 A circuit

breaker is used as

5 A circuit

breaker

l 12 A circuit

breaker is used as

11 A circuitbreaker

l 20 A circuit

breaker is used as

18 A circuit

breaker

Transmis

sion

equipment

4 A 8

DCDU-

03B

GSM

distribute

d base

station

20 A 6

12 A 3

DCDU-

03C

WCDM

A,

WiMAX,

and

CDMA

distributed base

stations

12 A 7

6 A 2

NOTE

When configured with different types of DCDU, the PS4890 can meet different requirements for DC power

distribution.

2.2 Application Scenarios of the PS4890

The PS4890 can work with the BTS3900 or the distributed base station, meeting the requirements

in different scenarios.

PS4890 + BTS3900

The PS4890 works with the BTS3900 in the following application scenarios:

lThe PS4890 provides -48 V DC power supply to the BTS3900. It also provides a space of7 U to 13 U for customer equipment.

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l In the absence of mains, the built-in batteries of the PS4890 provides DC power to the

BTS3900.

Figure 2-1shows the application scenario of PS4890 + BTS3900.

Figure 2-1PS4890 + BTS3900 (with built-in batteries)

PS4890 + Distributed Base StationThe PS4890 works with the distributed base station in the following application scenarios:

l The PS4890 provides -48 V DC power supply to the distributed base station. It also provides

a space of 7 U to 13 U for customer equipment.

l In the absence of mains, the built-in batteries of the PS4890 provides DC power to the

distributed base station.

Figure 2-2shows the application scenario of PS4890 + distributed base station.

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Figure 2-2PS4890 + distributed base station

2.3 Technical Specifications of the PS4890The technical specifications of the PS4890 consist of the electrical specifications, engineering

specifications, surge protection specifications, and environment requirements.

2.3.1 Electrical Specifications

The electrical specifications of the PS4890 consist of the AC input, DC output , protection, and

heat consumption.

Table 2-3describes the electrical specifications.

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Table 2-3Electrical specifications

Item Specification Remarks

AC input Typical

inputvoltage

200 V AC to 240 V AC (single-phase 220

V AC)

Normal voltage range:

176 V AC to 290 V AC(single-phase 220 V

AC)

200/346 V AC to 240/416 V AC (three-

phase 220/380 V AC)


176/304 V AC to

290/500 V AC (three-

phase 220 V AC)

100/200 V AC to 120/240 V AC (dual-live-

wire 110 V AC)


90/180 V AC to

135/270 V AC (dual-

live-wire 110 V AC)

120/208 V AC to 127/220 V AC (dual-live-

wire 120 V AC)


105/176 V AC to

150/260 V AC (dual-

live-wire 120 V AC)

Input

voltage

frequenc

y

50 Hz or 60 Hz -

Maximu

m inputcurrent

10 A (three-phase 220/380 V AC) -

30 A (dual-live-wire 110 V AC, dual-live-

wire 120 V AC, or single-phase 220 V AC)

-

Input

mode

l Three-phase 220/380 V AC

l Dual-live-wire 110 V AC

l Dual-live-wire 120 V AC

l Single-phase 220 V AC

-

DC

output

character

istics

Typical

output

voltage

-48 V DC Output voltage range:

-43.2 V DC to -57 V

DC

Output

current

range

l 0 A to 60 A when 2 PSUs are

configured

l 0 A to 90 A when 3 PSUs are

configured.

l The power system

can be configured

with a maximum of

three PSUs.

l The maximum

output current of a

single PSU is 30 A.

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Maximu

m output

current

l 90 A when built-in batteries are

configured.

l 76.2 A when 48 V 92 Ah batteries areconfigured.

l 62.4 A when 48 V 184 Ah batteries are

configured.

-

DC

output

power

3200 W (supporting N + 1 backup mode

for the PSU)

When the BBU or

transmission devices

are configured, the

total power of the

BBU and the

transmission devices

must be lower than or

equal to 500 W.

Protectio

n

character

istics

Input

protectio

n

l Overvoltage protection: The system

generates an alarm when the input

voltage exceeds the AC overvoltage

alarm threshold which is 280 V by

default.

l Undervoltage protection: The system

generates an alarm when the input

voltage is lower than the AC

undervoltage alarm threshold which is

180 V by default.

-

Output

protectio

n

l Overvoltage protection: The system

generates an alarm when the busbar

voltage exceeds the DC overvoltage

alarm threshold (-58 V by default).

l Undervoltage protection: The system

generates an alarm when the busbar

voltage is lower than the DC

undervoltage alarm threshold (-45 V by

default).

l Overcurrent protection and short-

circuit protection

-

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Maximum

permissible heat

consumption in thecabinet

550 W

NOTE

l The heat consumption of the power systemis included.

l The heat consumption of the power system

varies with the output power.

l The upper

threshold of the

permissibletemperature at the

air inlet of the BBU

and the

transmission

devices should be

higher than or

equal to 60C. If

the BBU and the

transmission

devices have built-

in fans, the air

vents should be leftand right vents.

l The total heat

consumption of the

BBU and the

transmission

devices should be

less than or equal to

200 W.

2.3.2 Engineering Specifications

The engineering specifications of the PS4890 involve the cabinet weight, cabinet dimensions,

and base dimensions.

Table 2-4describes the engineering specifications.

Table 2-4Engineering specifications


Weight l Empty cabinet 48 kg

l Assembly cabinet with built-in 48 V 92

Ah battery groups 215 kg

l Assembly cabinet with built-in 48 V

184 Ah battery groups 370 kg

An assembly cabinet refers

to a cabinet in fullconfiguration, excluding

transmission devices and

external cables.

Dimensions of

the cabinet

(width x height x

depth)

600 mm x 900 mm x 450 mm The base is not included.

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Dimensions of

the base (width x

height x depth)

600 mm x 40 mm x 420 mm -

2.3.3 Surge Protection Specifications

The PS4890 provides surge protection for the AC input port, DC output port, and Boolean signal

of the monitoring board.

Table 2-5describes the surge protection specifications.

Table 2-5Surge protection specifications

Item Specification

Surge protection for AC

input port

l In differential mode (8/20 s): 3 kA

l In common mode (8/20 s): 5 kA

Surge protection for DC

output port of the

DCDU-03



Surge protection for the two

Boolean signals of the A

output port on the built-inHPMI of the DCDU-04



Surge protection for the

five Boolean signals of the

B/C/E input port on the

built-in HPMI of the

DCDU-04



2.3.4 Environmental RequirementsThe environment requirements of the PS4890 consist of the working temperature, altitude, direct

sunlight intensity, indoor International Protection (IP) level, atmospheric pressure, temperature

variation rate, relative humidity, and absolute humidity.

The PS4890 can be used indoors. Table 2-6describes the environmental requirements of the

PS4890.

Table 2-6Environmental requirements

Item Range

Working temperature -20C to +45C

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Item Range

Altitude 4,000 m

NOTE

The PS4890 works normally at an altitude ranging from -60 m to 3,000 m.The PS4890 should work in derating mode at the altitude from 3,000 m to

4,000 m. The ambient temperature drops by 1C each time the altitude

increases by 100 m from the altitude of 3,000 m.

Direct sunlight intensity Indoor: 700 W/m2(45C)

IP level IP20

Atmospheric pressure 70 kPa to 106 kPa

Temperature variation

rate

3C/min

Relative humidity 5% Rh to 95% Rh

Absolute humidity 1 g/m3to 25 g/m3

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3Introduction to the PS4890About This Chapter

This describes the exterior, structure, components, and cables of the PS4890.

3.1 Exterior of the PS4890

The PS4890 cabinet is designed in compliance with the IEC297 standard. It is a vertical cabinet.

3.2 Structure of the PS4890

The PS4890 cabinet houses the AC/DC power system and modules such as the DCDU-04 and

DCDU-03.

3.3 ComponentsThe PS4890 components are the power system, DCDU-04, DCDU-03, and batteries.

3.4 Cables

The PS4890 cables consists of the PGND cables, power cables, and signal cables for the PS4890.

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3.1 Exterior of the PS4890

The PS4890 cabinet is designed in compliance with the IEC297 standard. It is a vertical cabinet.

Figure 3-1shows the exterior of the PS4890.

Figure 3-1Exterior of the PS4890

3.2 Structure of the PS4890

The PS4890 cabinet houses the AC/DC power system and modules such as the DCDU-04 and

DCDU-03.

Figure 3-2shows the internal structure of the PS4890 cabinet.

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Figure 3-2Internal structure of the PS4890 cabinet

(1) AC/DC power system (2) DCDU-04 (3) DCDU-03 (4) Negative wiring copper

bar for the battery group

(5) Support plate for the

battery group

(6) Positive wiring copper

bar for the battery group

(7) Baffle plate -

The PS4890 cabinet has the following functions:

l The 48 V 92 Ah or 48 V 184 Ah battery groups in the cabinet provides backup power.

l The AC/DC power system converts the AC power into -48 V DC power and provides three

outputs to the battery group, DCDU-04, and DCDU-03.

l The DCDU-04 provides two DC outputs to the BTS3900.

l The DCDU-03 provides nine DC outputs to the transmission equipment.

3.3 ComponentsThe PS4890 components are the power system, DCDU-04, DCDU-03, and batteries.

3.3.1 Power Equipment (AC/DC)

The power equipment (AC/DC) converts AC power into -48 V DC power.

Components of the Power Equipment (AC/DC)

The power equipment (AC/DC) consists of the PMU, PSUs (AC/DC) and power subrack (AC/DC).

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Figure 3-3shows the power equipment (AC/DC).

Figure 3-3Power equipment (AC/DC)

(1) PMU (2) PSUs (AC/DC) (3) Power subrack (AC/DC)

Table 3-1describes the components of the power equipment (AC/DC).

Table 3-1Components of the power equipment (AC/DC)

Component Description

PMU For details, see PMU.

PSU (AC/DC) For details, see PSU (AC/DC).

Power subrack (AC/DC) For details, see Power Subrack (AC/DC).

PMU

The Power and Environment Monitoring Unit (PMU) performs the power system management,

power distribution detection, and alarm reporting functions.

Functions

The PMU performs the following functions:

l Communicates with the BBU or upper-level PMU through an RS232/RS422 serial port.

l Manages the power system and battery charge/discharge.

l Detects and reports water damage alarms, smoke alarms, door status alarms, and

customized Boolean values.

l Reports the ambient temperature, ambient humidity, battery temperature, and customized

analog values.

l Monitors power distribution, reports related alarms, and reports dry contact alarms.

Exterior

Figure 3-4shows the PMU.

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Figure 3-4PMU

Ports and LEDs

Figure 3-5shows the front panel of the PMU.

Figure 3-5Front panel of the PMU

(1) RS232/RS422 ports (2) LEDs (3) Power supply test ports

(4) TEST port (5) Battery control switch (6) COM port

Table 3-2describes the ports and switch on the PMU.

Table 3-2Ports and switch on the PMU

Port/Switch Function

RS232/RS422 port Communicating with the BBU or upper-level PMU

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Port/Switch Function

Power supply test port Measuring the power voltage by using a multimeter through the

-48V/+24V and 0V ports

TEST port Testing

Battery control switch Controlling the connection of the batteries through the ON and OFF

ports

l Press and hold the ON port for 5s to 10s to connect to the

batteries.

l Press and hold the OFF port for 5s to 10s to disconnect the

batteries.

CAUTION

l You must insert a small round bar into the hole when you operate the

battery control switch. When you hear a crack, the batteries are connected

or disconnected.

COM port Reserved for connecting to the external signal monitoring board

Table 3-3describes the LEDs on the panel of the PMU.

Table 3-3LEDs on the panel of the PMU

Label Color Status Description

RUN Green Blinking (on for 1s andoff for 1s)

The unit is functional, and thecommunication with the BBU or upper-level

PMU is normal.

Blinking (on for 0.125s

and off for 0.125s)

The unit is functional, but the communication

with the BBU or upper-level PMU fails. If

the unit does not communicate with the BBU

or upper-level PMU for one minute, the

communication is regarded as failed.

On or off The unit is faulty or the unit is in power-on

self-check state.

ALM Red On The base station reports at least one of thefollowing alarms:

l Mains overvoltage or undervoltage alarm

l Busbar overvoltage or undervoltage

alarm

l Alarm related to PSUs

l Load disconnection alarm

Off No alarm is reported.

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NOTE

In 3s to 5s after the PMU is powered on, the ALM and RUN LEDs are simultaneously on for about 3s.

DIP Switch

The DIP switch, which is used to choose monitoring address, is positioned on the right panel of

the PMU. The DIP switch has eight bits, which are set before the PMU is delivered, as shown

in Figure 3-6.

Figure 3-6Right panel of the PMU

PSU (AC/DC)

The PSU is a power supply unit. The PSU (AC/DC) converts 220 V AC power into -48 V DC

power.

Panel

Figure 3-7shows the panel of the PSU (AC/DC).

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Figure 3-7Panel of the PSU (AC/DC)

(1) Power LED (2) Protection LED (3) Fault LED

Functions

The PSU (AC/DC) performs the following functions:

l Converts 220 V AC power into -48 V DC power and supplies -48 V DC power to the

DCDU-01.

l Monitors the unit and reports alarms related to PSU faults (such as output overvoltage, no

output, and fan faults), alarms related to PSU protection (such as overtemperature

protection, and input overvoltage/undervoltage protection), and PSU out-of-position alarm,

if any.

LEDs

Table 3-4describes the LEDs on the panel of the PSU (AC/DC).

Table 3-4LEDs on the panel of the PSU (AC/DC)

LED Color Status Description

Power LED Green On The power supply isnormal.

Off There are faults (such

as no AC input, or

overvoltage and

undervoltage of AC

input) on the mains,

or the PSU has no

output.

Protection LED Yellow Off The running status is

normal.

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LED Color Status Description

On There is a pre-alarm

relating to

temperature or thefan.

Fault LED Red Off The PSU is normal,

or the PSU has no

output because of

faults (such as no AC

input, or overvoltage

and undervoltage of

AC input) on the

mains.

On There is no output

because of outputovervoltage

shutdown, the fan

fault,

overtemperature

shutdown, remote

shutdown, or an

internal PSU fault.

Power Subrack (AC/DC)The power subrack (AC/DC) provides the power input wiring terminals, wiring terminals for

batteries, and battery power output wiring terminal. The terminals are used for the connections

of the input power cables, output power cables, and power cable for the batteries respectively.

Panel

Figure 3-8shows the panel of the power subrack (AC/DC).

Figure 3-8Panel of the power subrack (AC/DC)

(1) Power input wiring terminals (2) Power switch of the batteries

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(3) Wiring terminals for batteries (4) Power output wiring terminals

Ports

Table 3-5describes theterminals and switch on the power subrack (AC/DC).

Table 3-5Terminals and switch on the power subrack (AC/DC)

Terminal/Switch Description

Power input wiring terminals These terminals are used for the connections of

the AC input power cables.

Power output wiring terminals The LOAD1(-) and LOAD2(-) wiring

terminals are used for the connections of the-48 V power cables, and the RTN(+) wiring

terminals are used for the connections of the

-48 V RTN cables.

Wiring terminals for batteries The BAT(-) wiring terminal is used for the

connection of negative pole for the batteries,

and the BAT(+) wiring terminal is used for the

connection of positive pole for the batteries.

Power switch of the batteries The power switch controls the connection of

the batteries.

3.3.2 DCDU-04

The DCDU-04 provides DC power to the BTS3900 or other base stations.

Structure

For the position of the DCDU-04, see 3.2 Structure of the PS4890. Figure 3-9shows the

structure of the DCDU-04.

Figure 3-9Structure of the DCDU-04

Engineering Specifications

Table 3-6describes theengineering specifications of the DCDU-04.

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Table 3-6Engineering specifications of the DCDU-04

Item Specification

Weight 3 kg

Dimensions (Width x Height x Depth) 442 mm x 42 mm x 140 mm

Functions

The DCDU-04 is used for DC power distribution. All the input and output power cables are

connected on the front panel. The DCDU-04 has the following functions:

l Supports two DC power outputs at a maximum current of 80 A respectively, which can

provide power supply to BTS3900 or other base stations.

l Provides the temperature alarm of the battery through the built-in HPMI (Hert Power andenvironment Monitoring Interface unit).

Port

Figure 3-10describes the ports on the panel of the DCDU-04.

Figure 3-10Ports on the panel of the DCDU-04

Figure 3-11shows the HPMI.

Figure 3-11HPMI

Table 3-7describes the ports on the panel of the DCDU-04.

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Table 3-7Ports on the panel of the DCDU-04

Port Label Function

DC output

terminals

LOAD0 and LOAD1 Providing two output DC power at a

maximum current of 80 A.

HPMI TO PMU DB50 Transferring the monitoring signals of the

PMU

A:1.2.3.4 Transmitting two Boolean signals

B:1.2.3.4 Receiving two Boolean signals

C:1.2.3.4 l 1.2: receiving one Boolean signals

l 3.4: detecting the fuse alarm signals

Gate Receiving the door status alarm signals

D:1.2.3.4 l 1.2: receiving the AC surge protection

alarm signals

l 3.4: receiving the DC surge protection

alarm signals

Bat1 Tmp Receiving the battery temperature

monitoring signals

E:1.2.3.4 Receiving two Boolean signals

Smoke Receiving the smoke alarm signals

Water Receiving the water immersion alarm signals

Tem Humi Receiving the temperature and humidity

alarm signals

Bat2 Tmp Providing the standby port for the input of

the battery temperature monitoring signals

3.3.3 DCDU-03B/DCDU-03C

The Direct Current Distribution Unit-03 (DCDU-03B/DCDU-03C) supplies DC power to eachcomponent in the cabinet. The height of the DCDU-03B/DCDU-03C is 1 U. It can be classified

into the DCDU-03B and DCDU-03C according to the configured circuit breakers and application

scenarios. The two models have the same exterior and engineering specifications.

Exterior

Figure 3-12shows the DCDU-03B/DCDU-03C.

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Figure 3-12DCDU-03B/DCDU-03C

Functions

The DCDU-03B/DCDU-03C provides nine -48 V DC outputs and different circuit breaker

configurations to meet the power distribution requirements of the scenarios of distributed and

separated base stations.

Table 3-8describes the DC power distribution functions of the DCDU-03B/DCDU-03C.

Table 3-8DC power distribution functions of the DCDU-03B/DCDU-03C

DCDU

Model

DC Output

Terminal

Power

ConsumptionEquipment

circuit

breakerSpecification

circuit

breakerQuantity

Applicatio

n Scenario

DCDU-03B LOAD0 to

LOAD5

RRU 20 A 6 Distributed

base station/

Mini base

stationLOAD6 to

LOAD8

BBU and the

transmission

equipment of

the customer

12 A 3

DCDU-03C LOAD0 to

LOAD5

Transmissio

n equipmentof the

customer

12 A 6 Separated

macro basestation in the

-48 V DC

power

supply/

Transmissio

n cabinet

LOAD6 BBU 12 A 1

LOAD7 Transmissio

n equipment

of the

customer

6 A 1

LOAD8 Fan box 6 A 1

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Ports

Figure 3-13describes the ports on the panel of the DCDU-03B/DCDU-03C.

Figure 3-13Ports on the panel of the DCDU-03B/DCDU-03C

Table 3-9describes theports on the panel of the DCDU-03B/DCDU-03C.

Table 3-9Ports on the panel of the DCDU-03B/DCDU-03C

Port Specification Power Cable Cross-Sectional Area

Remarks

DC input

terminal

Supports the

M6 2-hole OT

terminal (one

input)

Maximum = 25mm2,

default = 16mm2,

When the DCDU-03C is used

in the transmission cabinet,

the cross-sectional area of the

input power cable is 4 mm2.

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Port Specification Power Cable Cross-Sectional Area

Remarks

DC output

terminal

Supports the

M4 single holeOT terminal (9

outputs)

Maximum = 6mm2 l The specification for a

power cable depends onthe device to which the

cable is connected. For

example, the specification

for a fan power cable is 2.5

mm2.

l Three rows of wiring

terminals for outputs:

NEG(-), RTN(+), and

PGND, where, the last

three pairs of the PGND

wiring terminals support

the grounding of the M4 2-hole OT terminals, which

are marked in red in

Figure 3-13

3.3.4 Battery

This describes the technical specifications, and types of the batteries in the PS4890 cabinet.

Technical SpecificationsTable 3-10describes thetechnical specifications of a single battery in the PS4890.

Table 3-10Technical specifications of a single battery

Type Dimensions (Width xHeight x Depth)

Weight

12 V 92 Ah 105 mm x 287 mm x 390 mm 33.5 kg

108 mm x 287 mm x 393 mm 35 kg

Specifications

The PS4890 supports the following types of battery group:

l Four 12 V 92 Ah batteries can be connected in series to provide a 48 V 92 Ah battery group.

l Two 48 V 92 Ah batteries can be connected parallely to provide a 48 V 184 Ah battery

group.

3.4 CablesThe PS4890 cables consists of the PGND cables, power cables, and signal cables for the PS4890.

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3.4.1 PGND Cable for the Cabinet

The PGND cable ensures the reliable grounding of the cabinet.

Structure

Figure 3-14shows the PGND cable for the cabinet.

Figure 3-14PGND cable for the cabinet

(1) OT terminal

Cable Description

Table 3-11describes the PGND cable for the cabinet.

Table 3-11Specifications of the PGND cable for the cabinet

Color Cross-Sectional

Area

One End Is

Connected to...

The Other End Is

Connected to...

Green and

yellow25 mm2 Grounding terminal on

the left of the cabinet

Wiring terminal on the

protection ground bar

of the site

3.4.2 PGND Cable for the DCDU-03

The PGND cable for the DCDU-03 ensures the grounding of the DCDU-03. PGND cables for

different types of DCDUs-03 have the same specifications.

Structure

Figure 3-15shows the PGND cable for the DCDU-03.

Figure 3-15PGND cable for the DCDU-03

(1) OT terminals

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Cable Description

Table 3-12describes specifications of the PGND cable for the DCDU-03.

Table 3-12Specifications of the PGND cable for the DCDU-03

Connector Color Cross-Sectional Area Connected to

M4 OT

terminal

Green and

yellow6 mm2 Grounding terminal of the

DCDU-03

M6 OT

terminal

Grounding terminal on the

right of the cabinet

3.4.3 PGND Cable for the Power System (AC/DC)

PGND cable for the power system (AC/DC) ensures the grounding of the power system.

Structure

Figure 3-16shows the PGND cable for the power system (AC/DC).

Figure 3-16PGND cable for the power system (AC/DC)

(1) OT terminals

Cable Description

Table 3-13describes the specifications of the PGND cable for the power system (AC/DC).

Table 3-13Specifications of the PGND cable for the power system (AC/DC)

Color Cross-SectionalArea

One End The Other End

Green and

yellow6 mm2 Grounding terminal on

the power subrack (AC/

DC)

Grounding terminal on

the right of the cabinet

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3.4.4 Input Power Cable

The input power cable for the PS4890 is used to supply external AC power to the PS4890.

StructureThe structure for the input power cables vary with the types of power inputs. Figure 3-17shows

the 220 V AC single-phase power cable.

Figure 3-17220 V AC single-phase power cable

(1) OT terminal

NOTE

Different types of the input power cables have different structure and different number of wires. Figure

3-17takes the 220 V AC single-phase power cable as an example.

Cable Description

Table 3-14describes the specifications of the input power cable.

Table 3-14Specifications of the input power cable

Categories of theCables

Name Quantity Cross-Sectional Area

220 V AC three-

phase power cable:

L 3 2.5 mm2

N 1 2.5 mm2

220 V AC single-

phase power cable

L 1 6 mm2

N 1 6 mm2

110 V AC dual-

live-wire

L 2 6 mm2

120 V AC dual-

live-wire

L 2 6 mm2

NOTE

The colors and structure of cables delivered by Huawei vary with countries and areas. If cables are

purchased at local markets, the cables must comply with the local rules and regulations.

3.4.5 Input Power Cable for the DCDU-04

The input power cable for the DCDU-04 is used to supply -48 V DC power to the DCDU-04.

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Structure

Figure 3-18shows the input power cable for the DCDU-04.

Figure 3-18Input power cable for the DCDU-04

(1) OT terminal

Cable Description

Table 3-15shows the specifications of the input power cable for the DCDU-04.

Table 3-15Specifications of the input power cable for the DCDU-04



Blue 25 mm2 Power subrack: LOAD1(-) DCDU-04

Black Power subrack: RTN(+)

3.4.6 Output Power Cable for the DCDU-04

The output power cable for the DCDU-04 is used to provide -48V DC power supply to the

BTS3900 or other base stations.

Structure

Figure 3-19shows the 2-hole OT terminal of the output power cable for the DCDU-04.

Figure 3-192-hole OT terminal of the power cable of the DCDU-04

(1) 2-hole OT terminal

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Cable Description

Table 3-16describes the specifications of the output power cable for the DCDU-04.

Table 3-16Specifications of the output power cable for the DCDU-04

Color Connector Type

Cross-SectionalArea


Blue M6 2-hole

OT

terminal

16 mm2 Wiring terminal NEG(-)

of the DCDU-04

Wiring terminal for the

negative poles of the

BTS3900 or other base

stations

Black Wiring terminal RTN(+)

of the DCDU-04

Wiring terminal for the

positive poles of theBTS3900 or other base

stations

3.4.7 Input Power Cable for the DCDU-03

The input power cable for the DCDU-03 is used to supply -48 V DC power to the DCDU-03.

Structure

Input power cables for different DCDU-03 have the different specifications. Figure 3-20shows

the input cable for the DCDU-03A, Figure 3-21shows the input cable for the DCDU-03B and

DCDU-03C.

Figure 3-20Input power cable for the DCDU-03A

(1) Single-hole OT terminal

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Figure 3-21Input power cable for the DCDU-03B/DCDU-03C

(1) Single-hole OT terminal

Cable Description

Table 3-17shows the specifications of the input power cable for the DCDU-03.

Table 3-17Specifications of the input power cable for the DCDU-03



Blue DCDU-03A: 6 mm2

DCDU-03B,

DCDU-03C: 25 mm2

DC output terminal

LOAD2(-) of the

power subrack

DC input terminal

NEG(-) of the

DCDU-03

Black DC output terminal

RTN(+) of the power

subrack

DC input terminal

RTN(+) of the

DCDU-03

3.4.8 Output Power Cable for the DCDU-03

The output power cable for the DCDU-03 is used to supply -48 V DC power to the external

devices.

Structure

Figure 3-22shows the output power cable for the DCDU-03.

Figure 3-22Output power cable for the DCDU-03

(1) OT terminals

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Cable Description

The output power cable of the DCDU-03 supports a maximum cross-sectional area of 6 mm2.

3.4.9 Environment Monitoring Signal Cable for the Power CabinetEnvironment monitoring signal cable for the power cabinet transmits the external monitoring

signals to the PMU.

Structure

Environment monitoring signal cable for the power cabinet is black and 0.5 m long, with an

DB50 male connector at each end, as shown in Figure 3-23.

Figure 3-23Environment monitoring signal cable for the power cabinet

(1) DB50 male connector

Pin Assignment

Table 3-18describes the pin assignment for the wires of the environment monitoring signal

cable for the power cabinet.

Table 3-18Pin assignment for the wires of the environment monitoring signal cable for the

power cabinet.

X1 End X2 End Description

1 1 Single wire

3 3 Twisted pair

4 4

5 5 Twisted pair

8 8

9 9 Twisted pair

10 10

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11 11 Twisted pair

12 12

13 13 Twisted pair

14 14

16 16 Twisted pair

17 17

18 18 Twisted pair

19 19

20 20 Twisted pair

21 21

22 22 Twisted pair

23 23

24 24 Twisted pair

25 25

27 27 Twisted pair

28 28

29 29 Twisted pair

30 30

31 31 Twisted pair

32 32

33 33 Twisted pair

34 34

43 43 Twisted pair

44 44

Installation Position

Table 3-19describes the installation positions of the environment monitoring signal cable for

the power cabinet.

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Table 3-19Installation positions of the environment monitoring signal cable for the power

cabinet


COM port on the PMU module DB50 port of the DCDU-04

3.4.10 Monitoring Signal Cable of the PMU

The monitoring signal cable of the PMU transmits monitoring signals from the PMU to the BBU.

Structure

The monitoring signal cable of the PMU is black and 3 m long by default, with an RJ45 connector

at each end, as shown in Figure 3-24. If the length of the cable exceeds 3 m, you must make thecable on site.

Figure 3-24Monitoring signal cable of the PMU

1 RJ45 connector

Pin Assignment

Table 3-20describes the pin assignment for the wires of the monitoring signal cable for the

PMU.

Table 3-20Pin assignment for the wires of the monitoring signal cable for the PMU


X1.1 X2.1 Twisted pair

X1.2 X2.2


X1.6 X2.6


X1.5 X2.5


X1.8 X2.8

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Installation Position

Table 3-21describes the installation positions of the monitoring signal cable of the PMU.

Table 3-21Installation positions of the monitoring signal cable of the PMU


RS232/RS422 port on the PMU MON1 port on the UPEU/UEIU panel of the

BBU

3.4.11 Temperature Monitoring Signal Cable for the BatteriesThe temperature monitoring signal cable for the batteries is used for monitoring the status of the

batteries.

Structure

Figure 3-25shows the temperature monitoring signal cable for the batteries.

Figure 3-25Temperature monitoring signal cable for the batteries

(1) 2-pin terminal (2) Temperature sensor (3) One-hole OT terminal

Cable DescriptionTable 3-22shows the temperature monitoring signal cable for the batteries.

Table 3-22Specifications of the temperature monitoring signal cable for the batteries

Color The End with the 2-Pin TerminalConnected to...

The End with the One-hole OTTerminal Connected to...

Black BAT1_TEM port of the HPMI(1) The left inner wall of cabinet close to

the battery cabin(2)(3)

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NOTE

(1) Connect the positive and negative pins of the 2-pin terminal on the cable to the positive and negative

poles in the BAT1_TEM port. If they are reversely connected, the sensor will be damaged after being

powered on.

(2) Bind the one-hole OT terminal on the cable to the left inner wall of cabinet close to the battery cabinrather than connecting it to the positive or negative pole of a battery.

(3) Ensure that the bending radius of the cable on both sides of the temperature sensor are large enough to

avoid any damage to the core wires.

3.4.12 Power Cable for the Batteries

The power cables for the batteries consist of cable for series connection of batteries, cable

between the power subrack and the inter-battery copper bar, and cable between the batteries and

the inter-battery copper bar.

Inter-Battery Copper Bar

The inter-battery copper bar connects the single batteries in series to form a battery group. Figure

3-26shows the inter-battery copper bar.

Figure 3-26Inter-Battery copper bar

Cable Between the Power Subrack and the Inter-Battery Copper BarFigure 3-27shows the cable between the power subrack and the inter-battery copper bar.

Figure 3-27Cable between the power subrack and the inter-battery copper bar

(1) OT terminals

Table 3-23describes the specifications of the cable between the power subrack and the inter-

battery copper bar.

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Table 3-23Specifications of the cable between the power subrack and the inter-battery copper

bar

Color Cross-Sectional Area One End IsConnected to...

The Other End IsConnected to

Black 16mm2 Negative pole of the

power subrack BAT (-)

Inter-battery copper bar

on the negative pole of

the batteries

Red Positive pole of the

power subrack BAT (+)


of the positive pole of

the batteries

Cable Between the Batteries and the Inter-Battery Copper Bar

Figure 3-28shows the cable between the batteries and the inter-battery copper bar.

Figure 3-28Cable between the batteries and the inter-battery copper bar

(1) OT terminal

Table 3-24describes the specifications of the cable between the batteries and the inter-battery

copper bar.

Table 3-24Specifications of the cable between the batteries and the inter-battery copper bar

Color Cross-Sectional Area One End IsConnected to...

The Other End IsConnected to...

Black 25 mm2

Negative pole of thebatteries

Inter-battery copper baron the negative pole of

the batteries

Red Positive pole of the

batteries


on the positive pole of

the batteries

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4Cable Connections of the PS4890The cable connections of the PS4890 vary depending on the type of battery group configured in

the PS4890 cabinet.

Cable Connections of the PS4890 Configured with a 48 V 92 Ah Battery Group

Figure 4-1shows the power cable connections of the PS4890 configured with a 48 V 92 Ah

battery group, and Figure 4-2shows the signal cable connections.

Figure 4-1Power cable connections of the PS4890 configured with a 48 V 92 Ah battery group

Table 4-1lists the power cables of the PS4890 configured with a 48 V 92 Ah battery group.

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Table 4-1Power cables of the PS4890

SN Description

P1 For details, see 3.4.4 Input Power Cable.

P2, P3 For details, see 3.4.12 Power Cable for the

Batteries.

P4 For details, see 3.4.7 Input Power Cable for

the DCDU-03.

P5 For details, see 3.4.5 Input Power Cable for

the DCDU-04.

P6, P7 For details, see 3.4.6 Output Power Cable

for the DCDU-04.

P8, P9 For details, see 3.4.12 Power Cable for theBatteries.

Figure 4-2Signal cable connections of the PS4890 configured with a 48 V 92 Ah battery group

Table 4-2lists the signal cables of the PS4890 configured with a 48 V 92 Ah battery group.

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Table 4-2Signal cables of the PS4890

SN Description

S1 For details, see 3.4.10 Monitoring Signal

Cable of the PMU.

S2 For details, see 3.4.9 Environment

Monitoring Signal Cable for the Power

Cabinet.

S3 For details, see 3.4.11 Temperature

Monitoring Signal Cable for the Batteries.

Cable Connections of the PS4890 Configured with 48 V 184 Ah Batteries

Figure 4-3shows the power cable connections of the PS4890 configured with 48 V 184 Ah

batteries, and Table 4-1lists the power cables of the configuration.

Figure 4-3Power cable connections of the PS4890 configured with 48 V 184 Ah batteries

The signal cable connections of the PS4890 configured with 48 V 184 Ah batteries are the same

as those shown in Figure 4-2.

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5Maintenance of the PS4890About This Chapter

This describes the maintenance items for the PS4890. The maintenance items are the PMU, PSU,

DCDU-04, and DCDU-03.

5.1 Replacing the PMU

The PMU performs the power system management, power distribution detection, and alarm

reporting functions.

5.2 Replacingthe PSU (AC/DC)

When a PSU (AC/DC) has a fault that cannot be rectified in a short period, the PSU needs to be

replaced.

5.3 Replacingthe DCDU-04

When a DCDU-04 is faulty and cannot be repaired in time, you must replace it.

5.4 Replacingthe DCDU-03


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5.1 Replacing the PMU

The PMU performs the power system management, power distribution detection, and alarm

reporting functions.

Prerequisites

l The tools and materials, such as an ESD wrist strap or ESD gloves and screwdriver, are

ready.

l The authorized personnel are permitted to enter the site. The required keys are available.

Context

l This module is hot-swappable.

l Replacing the PMU does not affect the services.

Procedure

Step 1 Wear an ESD wrist strap or a pair of ESD gloves.

NOTE

Take proper ESD protection measures, for example, wear an ESD wrist strap or a pair of ESD gloves, to

prevent electrostatic damage to the boards, modules, or electronic components.

Step 2 Label the cables on the panel of the PMU, and then disconnect the cables from the PMU.

CAUTION

When inserting or removing the DB50 connector of the environment monitoring signal cable,

you must hold the connector with both hands and keep it perpendicular to the panel, to prevent

false alarms caused by bent pins.

Step 3 Loosen the screws on the handle of the PMU panel by using a Phillips screwdriver.

Step 4 Pull the handle gently to disconnect the PMU from the subrack, and then remove the PMU fromthe slot, as shown in Figure 5-1.

Figure 5-1Removing the PMU

Step 5 Put the fault PMU into a ESD box.

Step 6 Set the DIP switch on the new PMU, as shown in Figure 5-2.

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Figure 5-2Setting the DIP switch

Step 7 Loosen the screws on the handle of the PMU. Then, pull the handle outwards.

Step 8 Slide the PMU along the guide rails into the slot, and then push the handle back.

Step 9 Tighten the screws on the handle, as shown in Figure 5-3.

Figure 5-3Installing the PMU

Step 10 Connect the cables, which have been disconnected from the PMU, according to the labels.

Step 11 Take off the ESD wrist strap or gloves, and then pack up allthe tools.

----End

Follow-up Procedure

l Place the replaced component into the ESD box or bag. Then, place the ESD box or bag

into a carton padded with foam or into the packing box of the new component.

l Fill in the fault form with the details of the replaced board.

l Contact the local Huawei office to handle the faulty board.

5.2 Replacing the PSU (AC/DC)

When a PSU (AC/DC) has a fault that cannot be rectified in a short period, the PSU needs to bereplaced.

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Prerequisites

l The tools and materials, such as an ESD wrist strap or ESD gloves and screwdriver, are

ready.

l The authorized personnel are permitted to enter the site. The required keys are available.

Context

l The module is hot-swappable.

l Replacing the PSU (AC/DC) causes power-off of the cabinet and thus disrupts all services

carried by the base station.

Procedure

Step 1 Wear an ESD wrist strap or a pair of ESD gloves.

NOTE

Take proper ESD protection measures, for example, wear an ESD wrist strap or a pair of ESD gloves, to

prevent electrostatic damage to the boards, modules, or electronic components.

Step 2 Use a screwdriver to loosen the screws on the ejector levers of the panel of the PSU (AC/DC).

Step 3 Raise the ejector levers and remove the PSU (AC/DC) from the subrack, as shown in Figure5-4.

Figure 5-4Removing the PSU (AC/DC)

Step 4 Place the removed PSU (AC/DC) into an ESD box.

Step 5 Use a screwdriver to loosen the screws on the ejector levers of the PSU (AC/DC) and raise theejector levers.

Step 6 Slide the PSU (AC/DC) into the subrack and lower the ejector levers.

Step 7 Tighten the screws on the ejector levers. Figure 5-5shows the entire installation process.

Figure 5-5Installing the PSU (AC/DC)

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Step 8 Take off the ESD wrist strap or gloves, and then pack up all the tools.

----End

Follow-up Procedurel Place the replaced component into the ESD box or bag. Then, place the ESD box or bag

into a carton padded with foam or into the packing box of the new component.

l Fill in the fault form with the details of the replaced board.

l Contact the local Huawei office to handle the faulty board.

5.3 Replacing the DCDU-04


Prerequisites

l The type of the faulty DCDU-04 is checked, and the new DCDU-04 is ready.

l The new DCDU-04 is not damaged, and its version is consistent with the version of the

faulty DCDU-04.

l The tools and materials, such as the ESD wrist strap or gloves, Phillips screwdriver, ESD

box or bag, and key to the cabinet door, are available.

Precautions

DANGER

Before replacing the DCDU-04, you must power off the PS4890 cabinet and set the circuit

breaker of the batteries to OFF to prevent personal injuries.

Procedure

Step 1 Power off the PS4890.

Step 2 Set the circuit breaker labeled BAT. of the batteries on the panel of the power subrack to OFF.

Step 3 Set the DCDU-04 DC circuit breakers labeled SW0 and SW1 to OFF.

Step 4 Remove the DCDU-04 input power cable connected to the DC output terminal labeledLOAD1 on the power subrack.

Step 5 Remove the output power cable of the DCDU-04.

Step 6 Remove the battery temperature monitoring cable on the HPMI of the DCDU-04, surgeprotection alarm cable for the DCDU-03, and environment monitoring cable for the PMU on

the HPMI board of the DCDU-04, and record the installation positions.

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CAUTION

When connecting the DB50 connector of the environment monitoring signal cable, you should

press the latches on both sides of the connector with both of your hands and plug or unplug the

connector perpendicularly to prevent monitoring error alarms caused by bent pins.

Step 7 Remove the DC output power cables connected to the terminals on both sides of the DCDU-04,label the cables, and then record the installation positions.

Step 8 Remove the M6x12 retention screws on the DCDU-04, and pull out the module slowly, as shownin Figure 5-6.

Figure 5-6Pulling out the DCDU-04

Step 9 Slide the new DCDU-04 into the installation position, and then fasten the removed M6x12screws.

Step 10 Reconnect the cables to the terminals on the new DCDU-04.

Step 11 Install the DC output power cable.

Step 12 Connect the DCDU-04 input power cable to the DC output terminal LOAD1 of the powersubrack.

Step 13 Connect the output power cable of the DCDU-04.

Step 14 Check and ensure the cablesare connected correctly and securely and then power on the PS4890.

Step 15 Set the circuit breaker labeled BAT. on the panel of the power subrack and all the circuit breakerson the DCDU-04 to ON.

----End

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Follow-up Procedure

After replacing the DCDU-04, check the following items:

l The DCDU-04 is securely installed, and the cables are correctly connected.

lThe DC outputs of the DCDU-04 are normal.

l After the HPMI is powered on, the related alarms on the M2000 or LMT are cleared.

l Contact the local Huawei office to handle the faulty DCDU-04.

5.4 Replacing the DCDU-03


Prerequisites

l The type of the faulty DCDU-03 is checked, and the new DCDU-03 is ready.

l The new DCDU-03 is not damaged, and its version is consistent with the version of the

faulty DCDU-03.

l The tools and materials, such as the ESD wrist strap or gloves, Phillips screwdriver, ESD

box or bag, and key to the cabinet door, are available.

Precautions

DANGER

Before replacing the DCDU-03, you must power off the PS4890 cabinet and set the circuit

breaker of the batteries to OFF to prevent personal injuries.

Procedure

Step 1 Power off the PS4890.

Step 2 Set the batteries circuit breaker labeled BAT. on the panel of the power subrack to OFF.

Step 3 Set the DCDU-03 DC circuit breaker labeled SW0 to SW9 to OFF.

Step 4 Disconnect the surge protection alarm cables from the DCDU-03C, label the cables, and thenrecord the installation positions.

Step 5 Remove the DC input power cable and the DC output power cable of the DCDU-03, label thecables, and then record the installation position.

Step 6 Remove the M6x12 retention screws on the DCDU-03, and pull out the module slowly, as shownin Figure 5-7.

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Figure 5-7Pulling out the DCDU-03

Step 7 Slide the new DCDU-03 into the installation position, and then fasten the removed M6x12screws.

Step 8 Connect the cables to the wiring terminals on the DCDU-03 according to the labels on the

disconnected cables in Step 4and Step 5.

Step 9 Check the cable connections and ensure that they are correct. Then, power on the PS4890.

Step 10 Set the circuit breaker labeled BAT. on the panel of the power subrack and all the circuit breakerson the DCDU-03 to ON.

----End

Follow-up Procedure

After replacing the DCDU-03, check the following items:

l The DCDU-03 is securely installed, and the cables are correctly connected.

l The DC outputs of the DCDU-03 are normal.

l After the HPMI is powered on, the related alarms on the M2000 or LMT are cleared.

l Contact the local Huawei office to handle the faulty DCDU-03.

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Documents

Rectifier PS4890 Description