tp48200a v300r001c03 training slide_v1.0

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TP48200A V300R001C03Training Slide


Preface

This course describes TP48200A V300R001C03 (TP48200A for short) in terms of its working principles, system installation, routine maintenance, and troubleshooting.

Copyright © 2012 Huawei Technologies Co., Ltd. All rights reserved. Page3

Reference Documentation

TP48200A V300R001C03 User Manual

TP48200A V300R001C03 Engineer Manual

TP48200A V300R001C03 Technical Proposal


Upon completion of this course, you should be able to:

Understand the features and working principles of the

TP48200A.

Understand the installation, commissioning, and routine

maintenance for the TP48200A.

Understand how to rectify common TP48200A faults.

Course Objectives


Contents

Chapter 1 Working Principles

Chapter 2 Introduction to the TP48200A

Chapter 3 Installation and Commissioning

Chapter 4 Acceptance

Chapter 5 Routine Maintenance

Chapter 6 Troubleshooting

Chapter 7 Engineering Design

Chapter 8 Test


1.1 Development History of the Communication Power Supply

Fourth generation

full-digital and

high-efficiency

power supply

Third generation

switch mode power supply

First generation

linear power supply

Second generation

phase-controlled power supply

Efficiency: 50%–60%Key part: power triodeControl mode: analog control

Efficiency: < 80%Key part: silicon controlled thyristor (SCR)Control mode: analog control

Efficiency: < 92%Key parts: insulated gate bipolar transistor (IGBT) and metal-oxide semiconductor (MOS)Control mode: analog and half-digital control

Green powerIntelligent

power supply

Efficiency: > 96%Key parts: CoolMOS and digital signal processor (DSP)Control mode: full-digital and adaptive control

Before 1980

1980–1990

1990–2008

Since 2009


1.2 Application Scenarios of the Communication Power Supply

Remote area/Pole-mount power supply

Enterprise Desktop power supply

Indoor power supply

Remote area/Outdoor power cabinet

Outdoor cabinet-type power supply

TP48200A

Residential blockResidential block

Residential block

Core network

Backbone network

Access network

Outdoor cabinet/Remo

te area

Twisted pair

Optical fiber

Wireless network

Indoor power supply

Indoor power supply

Outdoor cabinet

Category 5 cable

Wind power supply

Solar power supply

Outdoor cabinet-type power supply

TP48200A

TP48200A

TP48200A

TP48200A


1.3 Working Principles of the Communication Power Supply

Rectifier unittwo to four rectifiers

Rectifier unittwo to four rectifiers

SMU02BSMU02B

Mains input -48 V

RS485 port

Batterystring

Batterystring

Standby AC output

TCP/IP Intellige

nt equipm

ent communication protocol

TCP/IP Intellige

nt equipm

ent communication protocol

Local monitoring on the console

MODEM

SwitchRemote monitoring

Dry contact

Signal control

Environment monitoring

ACpower

distribution

ACpower

distribution

DCpower

distribution

DCpower

distribution


1.3 Working Principles of the Communication Power Supply (Continued)Working principle of rectifiersRectifiers convert AC power into stable DC power, functioning as the heart of a system power supply.

Rectifiers provide the following functions:

Power conversion

Signal detection, such as voltage, current, and temperature signals

Protection against faults such as over-temperature, overvoltage, and short circuits

Communication and monitoring

AC/DC220 V AC –48 V

SMU

RS485 port


1.3 Working Principles of the Communication Power Supply (Continued)

Topology of a rectifier


Master/Slave

Local/Web


Page11

Transmission

Application

Collection

Management

Working principle of site monitoring


Explanation:

The SMU is connected to the busbar. The power is

supplied by the unit or the storage batteries.

The collection layer collects data of analog

parameters, Boolean value, and southbound

equipment.

The data is processed by the data processing layer

and is sent to the subordinate equipment.

The data processing layer processes data such as

alarms and logs collected by the collection layer.

The data display layer displays the processing

results to users over LUI, Web, or protocols.


Page12

The SMU controls the operating status of the entire system, functioning as the brain of a system power supply.

Collection layer (CAN, RS485, main board)

Boolean value input

Boolean value output

Southbound equipment

Data processing layer

Analog input

Data display layer

LUI WEBProtoco

l

Northbound equipment

SMU


SMU

Environment monitoring

Battery management

Detection and control

Alarm processing

Power management

Communication management

G enerato r


Page13


CAN busPlug and play

Intelligent hibernation

Power management

Page14


Power management

RS485 port

Multi-level low voltage

disconnect (LVD)Shutdown

against over-temperature and alarm correlation

Voltage:Total loads:

Active alarmsHistorical

alarmsSystem logs

AC power distributionDC power distribution

Battery parameters


1.3 Working Principles of the Communication Power Supply (Continued)Intelligent battery management by the SMU

Battery voltage

Battery current

Normal float charging

Battery discharge caused by AC power

absence or other factors

LLVD BLVDConstant-current equalized charging after preliminary

current limiting

Constant-voltage equalized charging

RestorationTemperature compensation

Capacity test

Restoration after

preliminary current limiting

Brief Battery Management Graph

Voltage curveCurrent curve


Alarm Medium

Alarm signal

Record

Severity

buzzerindicatorLCD/WEB

Reports alarms through

communication

Dry contactreporting

Mains absenceBusbar undervoltageCharge overcurrentBattery disconnectionLoad power-offBattery string loop brokenAmbient temperature alarm

Too high or low ambient humidity Water intrusion

Smoke generationDoor status alarmRectifier alarm Load fuse blown alarmSPD failure alarm200 active

alarms

1000 historical alarms

Type, date, and time

Level 4 alarm

Severity level can be set.

Critical alarm

Major alarms

1.3 Working Principles of the Communication Power Supply (Continued)Alarm management

Critical alarm

Minor alarms

Warning alarm

Page16



FE/RS485/Dry contact

In-band Out-of-band Third-party Dry contact

NMS

Remote monitoring AC input voltage DC Load Current Battery string current DC busbar voltage Battery temperature Temperature and humidity

Rectifier startup and shutdown Boost and floating charge of

the rectifier Rectifier voltage and current

adjustment Battery/Load connection and

disconnection Battery string test

Remote control Remote communication Mains availability and mains

phase loss Mains undervoltage or

overvoltage DC overvoltage or undervoltage Rectifier status Load fuse status Battery fuse status Boolean value status

Page17

Communication processing

Note:At present, the TP48200A provides only an in-band management port without software commissioning. Therefore, do not publicize this feature.

Third-party device


Questions

What parts does the communication power supply consist of? What functions does each part provide?

What are main parameters and indexes of the communication power supply?

What external ports do the SMU and rectifiers provide?


Contents








Chapter 8 Test


2.1 Introduction to AC-to-DC Converter SeriesHuawei develops power supplies from the perspective of networks and therefore understands customer requirements better than other power supply vendors do. At present, Huawei provides the following self-developed power supplies (including under-development power supplies), and the types of power supplies are continuously increasing:

TP48600A-V3F0

TP48300/A

TP48300B-N16B2 TP48600B-N16B2

ETP48240-C2

TP48200AX3H5

Embedded

RRU, Micro site, FTTX, Micro wave

Wireless BTS, Fixed network access, Transmission, Intranet

Core network

30 A 60 A 120 A 200 A 240 A 300 A 600 A 10000

Outdoor

Wall hung

TP4830H-10 ATP4830H-30 A

Cabinet-type

Indoor

Outdoor

Indoor

TP4830H-N06B1

10 A

ETP48200 (8 U)

TP48200B-N20A5TP48200B-N20A6TP48200B-L20A5

TP48200B-N20B1

TP48200AX3H4 TP48200AX3H6

TP4890C-I TP4890C-D06A5TP4890C-D06A3 TP4890C-D06A6

TP4890C-IITP4890C-D06A2TP4890C-D06A1TP4890C-D06A7

ETP48120-C1ETP48200-A6ETP48200-B6

Page20

TP48200AV3R1C03


2.2 Introduction to the TP48200A

Cabinet BOM Number Model Remarks

A 01071337 TP48200A-H15A3 Integrated cabinet, heat exchange southern-type power cabinet

B 01071338 TP48200A-H15A5 Integrated cabinet, heat exchange northern-type power cabinet

C 01071339 TP48200A-D15A1 Integrated cabinet, natural ventilation southern-type power cabinet

D 01071340 TP48200E-H09A1 Split-type cabinet, heat exchange southern-type power cabinet

E 01071342 TP48200E-D09A1 Split-type cabinet, natural ventilation southern-type power cabinet

F 01071343 TBC300A-DCA1 Split-type cabinet, natural ventilation southern-type battery cabinet

G 01071344 TBC300A-TCA1 Split-type cabinet, thermoelectric cooler (TEC) battery cabinet

Scenario Cabinet Remarks

1 A Used independently

2 B Used independently

3 C Used independently

4 D Used independently

5 E Used independently

6 D+F Used in combination

7 D+G Used in combination

8 E+F Used in combination

9 E+G Used in combination

Names and models of cabinets for the TP48200A

Mapping between application scenarios and cabinets for the TP48200A


2.2 Introduction to the TP48200A (Continued)

Space for customer equipment (8 U)

Door status sensor

SMU

Rectifier

PDM

Battery compartment

Heat exchanger

Heater (optional for northern-type products)

Composition of the TP48200A-H15A3/H15A5 Composition of the TP48200A-D15A1

Space for customer equipment (8 U)

Door status sensor

SMU

Rectifier

Power distribution module (PDM)

Battery compartment

DC fan

Filter

TP48200E-H09A1 TP48200E-D09A1 TBC300A-DCA1 TBC300A-TCA1


2.2 Introduction to the TP48200A (Continued)No. Specifications

1

Environmental specificationsOperating temperature of northern-type products (TP48200A-H15A5 and TP48200E-H09A1): –40 C (–40 F) to +45 C (+113 F), with solar radiationOperating temperature of southern-type products (TP48200A-H15A3, TP48200A-D15A1, TP48200E-D09A1, TBC300A-DCA1, and TBC300A-TCA1):–10 C (+14 F) to +45 C (+113 F), with solar radiationStorage temperature: –40 C (–40 F) to +70 C (+158 F)Altitude: ≤ 4000 m (13123.20 ft). When the altitude ranges from 2000 m (6561.6 ft) to 4000 m (13,123.20 ft), the operating temperature decreases as the altitude increases.Humidity: 5% to 95% RH

2 AC power distribution2.1 Three-phase inputs, compatible with single-phase inputs2.2 Number of inputs: 12.3 Maximum input current: 82 A (involving a 16 A maintenance socket)2.4 Rated input voltage: three-phase 346 V AC to 415 V AC/200 V AC to 240 V AC

single-phase 200 V AC to 240 V AC2.5 Input frequency range: 45–65 Hz Rated frequency: 50 Hz or 60 Hz2.6 Surge protection for mains input: class C2.7 One 16 A circuit breaker for the maintenance socket and one 16 A circuit breaker applied to the heater in northern-type products3 DC power distribution3.1 Maximum system output capacity: 200 A3.2 Battery circuit breakers: two single-pole 125 A circuit breakers3.3 Number of disconnection routes:

Load low voltage disconnection (LLVD): two 63 A circuit breakers and two 32 A circuit breakersBattery low voltage disconnection (BLVD): two 16 A circuit breakers and one 10 A circuit breaker (installed in the split-type power cabinet to supply power to fans of the battery cabinet in cabinet combination scenarios)

3.6 Surge protection: surge protection device (SPD): differential mode: 10 kA common mode: 20 kA3 Rectifier3.1 Input voltage: ranging from 85 V AC to 300 V AC, with a rated value of 220 V AC (capable of bearing long-term 350 V AC voltage inputs without damage)3.2 Output voltage: ranging from 42 V DC to 58 V DC, with a rated value of 53.5 V DC. The output voltage is adjustable.3.3 Output power of a single rectifier:

2 U standard 50 A rectifier: 2900 W (176 V AC to 290 V AC)/1200 W (90 V AC to 175 V AC);2 U highly efficient 50 A rectifier: 3000 W (176 V AC to 290 V AC)/1200 W (90 V AC to 175 V AC).

3.4 Efficiency of a 2 U standard 50 A rectifier: ≥ 92%Efficiency of a 2 U highly efficient 50 A rectifier: ≥ 96%

3.5 Voltage regulation precision: ≤ ±0.6%3.6 Current equalization rate: ≤ ±5%4 International protection rating4.1 TP48200A-H15A3/H15A5: IP55 for the equipment compartment and IP45 for the battery compartment

TP48200A-D15A1/ TP48200E-D09A1: IP45TP48200E-H09A1/ TBC300A-TCA1: IP55TBC300A-DCA1: IP34

5 Heat dissipation capacity5.1 TP48200A-H15A3/H15A5/TP48200E-H09A1: 85 W/K

TP48200A-D15A1/TP48200E-D09A1: 140 W/K


2.2 Introduction to the TP48200A (Continued)


2.3 System Composition of the TP48200A

Page31

No. Component Name Description Remarks

1 PDM Provides power input and output ports.

2 Door status sensor Detects door status and provides the antitheft function.

3 SMUControls the operating of the entire power system, monitors the communication with the host, and monitors the battery compartment or cabinet.

4 Rectifier Converts AC power into DC power.

5Space for customer equipment

Provides 19-inch space for customer equipment.

6Battery compartment/cabinet

Provides space for installing two battery strings.

7 TCU Exhausts heat out of a cabinet.

8 Heater Heats the battery compartment in the case of low temperature. Optional for northern-type products

The TP48200A consists of the PDM, door status sensor, SMU, rectifiers, space for customer equipment, battery compartment or cabinet, and temperature control unit (TCU).

PDM

Door status sensor

SMU

Rectifier

Space for customer equipment

Battery compartment

TCU

Heater (optional for northern-type

products)

PDM

Door status sensor

SMU

Rectifier

Space for customer equipment

TCUPDM

Door status sensor

SMU

Rectifier

Equipment cabinet

TCU of the equipment cabinet

TCU of the battery cabinet

Battery cabinet

Space for customer

equipment


2.4 Parts of the TP48200A — Mandatory PartsRectifier

SMU

Uses highly efficient 50 A rectifiers in standard configuration and optional standard 50 A rectifiers.

Provides a maximum efficiency of no less than 96%.

Provides a grid voltage ranging from 85 V AC to 300 V AC.

Runs with the operating temperature ranging from –40˚C (–40˚F) to +70˚C (+158˚F).

Provides access to hot swap.

Supports communication over the RS485 serial port.

Supports alarming by indicators.

Supports voltage adjustment and current limiting.

Complies with Restriction of Hazardous Substances (RoHS), Technical Inspection Association (TUV), Conformity with European (CE), Underwriters Laboratories (UL), and Certification Bodies' Scheme (CB).

Displays information on the LCD and provides buttons for ease of operation. Supports the Transfer Control Protocol/Internet Protocol (TCP/IP), Hypertext

Transfer Protocol (HTTP), Simple Network Management Protocol (SNMP), and intelligent equipment communication protocol.

Detects power distribution status, reports alarms, and sends commands by communicating with the host over the COM port.

Supports the remote and local upgrade of software. Hot swap

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

(1) Run indicator (2) Minor alarm indicator (3) Major alarm indicator(4) Liquid crystal display (LCD) (5) Locking latch (6) Button(6) USB port (reserved) (8) RS485/RS232 serial port (9) FE communications port

Item Color Status Description

Run indicator Green Off The SMU is faulty or has no power input.Blinking at a frequency of 0.5 Hz

The SMU02B is running properly and communicating with the host properly.

Blinking at a frequency of 4 Hz

The SMU02B is running properly but is not communicating with the host properly.

Minor alarm indicator

Yellow Off No minor or warning alarm is generated.Steady on A minor or warning alarm is generated.

Major alarm indicator

Red Off No critical or major alarm is generated.Steady on A critical or major alarm is generated.


2.4 Parts of the TP48200A — Mandatory Parts (Continued)

MonitoringMonitoring on the console Remote

communicationMains absence

Battery equalized charging management Mains overvoltage

Battery float charging management Mains undervoltage

Battery discharge test AC SPD alarm

Battery current limiting management DC overvoltage

Battery temperature compensation DC undervoltage

Battery capacity monitoring and backup time calculation Load fuse blown

Intelligent battery hibernation parameters Charge overcurrent

Remote monitoring Battery string current Load disconnection

Battery imbalance (battery absence) (six ways) Battery disconnection

DC busbar voltage Over-high ambient temperature

Battery temperature (one way) Over-low ambient temperature

Ambient temperature and humidity (one way) Ambient humidity excessively high

Ambient temperature (two ways) Ambient humidity excessively low

　 n# Rectifier fault

Remote control Rectifier startup and shutdown n# Rectifier protection

Equalized and float charging for rectifiers Single-rectifier fault

Rectifier voltage adjustment Multi-rectifier fault

Rectifier current limiting Battery over-temperature protection

Intelligent rectifier hibernation Battery root open sensor

Load disconnection Door status

Battery disconnection Water sensor

Battery connection Smoke sensor

Powering on loads Spare Boolean value (six ways)

Dry contact output (eight ways)



User interface module (UIM)

The UIM02C provides eight dry contact outputs, six Boolean value inputs, and seven ports for sensors such as the smoke sensor, door status sensor, water sensor, and temperature and humidity sensor.



PDM panel

Item Requirements RemarksAC input circuit breaker 63 A, three-pole NoneClass C AC surge protection Class C surge protection Along the guide railCircuit breaker for the maintenance socket

One single-pole 16 A circuit breaker

Maintenance socket Universal maintenance socket, complying with CE

Load circuit breakers F1 to F7

Load protection: two single-pole 63 A circuit breakers and two single-pole 32 A circuit breakersBattery protection: two single-pole 16 A circuit breakersBattery circuit breakers: two single-pole circuit breakers

One additional 10 A circuit breaker in the split-type power cabinet, used to control the temperature control power supply of the battery cabinet in cabinet combination scenarios

Battery current divider FL 200 A, 25 mVLLVD contactor Normally closedBLVD contactor Normally open

DC SPD10 kA in differential mode and 20 kA in common mode, alarms generated when the SPD is faulty

Battery circuit breaker Two 125 A circuit breakers None

Voltage drop in the subrack ≤ 0.5 V (full load test)Voltage drop between the battery input port and the load output port


2.5 Features of the TP48200A

Easy installation

Three-phase inputs, compatible with single-phase inputs

High-level safety and regulatory design

Remote monitoring

Intelligent hibernation

The SMU and rectifiers are hot-swappable, which facilitates the system installation and maintenance. This reduces the operational expenditure (OPEX).

The TP48200A performs comprehensive self-management and battery management functions. The SMU communicates with rectifiers through an RS485 serial port, communicates with the host throughan RS-232, RS422, or RS485 serial port, communicates with third-party equipment through a Huawei SNMP module, and provides dry contact outputs. This enables remote monitoring when the TP48200A is left unattended and reduces the OPEX.

Rectifiers comply with UL, CE, TUV, and CE.

To conserve energy, the power system automatically enables one or more rectifiers to enter the hibernation mode based on the actual load power.

Rated input voltage: three-phase 346 V AC to 415 V AC/200 V AC to 240 V AC

single-phase 200 V AC to 240 V AC

Meeting medium-capacity requirements

Solutions are provided to meet the requirements for medium-capacity outdoor power supplies.

Intelligent temperature control design

1. The TCU uses the intelligent design. Fans provide linear speed regulation, reducing power consumption and extending the service life. 2. The equipment compartment uses heat exchange for heat dissipation, meeting IP55 protection requirements and applying to category C adverse environment. Natural-ventilation cabinets meet IP45 protection requirements and apply to category B environment.

Operability and maintainability

Cable connections, operations, and maintenance are performed in the front of the cabinet, meeting the operation and maintenance requirements of outdoor power supplies.

Features


2.6 Installation Scenarios of the TP48200A

Note:

Application regions: The TP48200A-H15A3, TP48200A-H15A5, TP48200E-H09A1, and TBC300A-TCA1 apply to category C outdoor environment. The TP48200A-D15A1, TP48200E-D09A1, and TBC300A-DCA1 apply to category B outdoor environment.

Definition of category B environment: rooms inside which the temperature and humidity are not controlled or general outdoor environment, including scenarios with a simple shield such as an awning and an occasional humidity of 100%.

Definition of category C environment: sea, land near a pollution source, or environment with simple shields. If a site is near a pollution source, it is at most 3.7 km (2.30 mi.) away from salt water such as the sea and salt lakes, 3 km (1.86 mi.) away from heavy pollution sources such as smelteries, coal mines, and thermal power plants, 2 km (1.24 mi.) away from medium pollution sources such as chemical, rubber, and galvanization industries, and 1 km (0.62 mi.) away from light pollution sources such as packinghouses, tanneries, and boiler rooms.

Application scenario:

Medium-capacity base station

Installation mode:Ground-mount, outdoor

AC power supply:Three-phase inputs, compatible with single-phase inputs

Rated input voltage: three-phase 346 V AC to 415 V AC/200 V AC to 240 V AC

single-phase 200 V AC to 240 V AC

D.G.

Mains

AC load

DC load

Storage battery


Questions

What models does the TP48200A provide? What parts does the TP48200A consist of?

What are main features of the TP48200A?

What environments does the TP48200A apply to?


Contents








Chapter 8 Test


3.1 Installation Process of the TP48200A

Installation flowchart of the TP48200A

Prepare for the installation.

Install a power cabinet.

Optional when an independent battery cabinet is required

Install a battery cabinet.

Install storage batteries and

sensors.

Connect cables.Verify the installation.

Power on and commission the

system.End


3.2 Preparations for Installation

Obtain required tools and cables before installation. For details about cable configurations, see the TP48200A V300R001C03 Configuration Manual V1.0. Ensure that colors of the cables meet local power cable standards.

Tools

Page41

Phillips screwdriverM3 and M4

Flat-head screwdriverM3 and M4

Adjustable wrench Claw hammer

Diagonal pliers Crimping tool

Wire stripper Hydraulic pliers Torque wrench Insulation tape Multimeter Electrician's knife

Nylon binding strap Heat gun Socket wrench Marker Heat shrink tubing

A-shaped ladder (2 m) Brush

Vacuum cleaner

Insulation glovesESD gloves

Protective gloves


3.3 Cabinet Installation Determine the installation space required for the cabinet by referring to the following figure. For details about the installation, see the TP48200A-D15A1 & H15A3 & H15A5 Quick Installation Guide (V300R001_01),

TP48200E-D09A1 & H09A1 Quick Installation Guide (V300R001_01), and TBC300A-DCA1 & TCA1 Quick Installation Guide (V300R001_01).

Observe the following requirements when you install the TP48200A: 1. Check whether delivered cabinets are intact, and whether paint or electroplated layer flakes off. 2. Check whether

configurations of delivered cabinets are consistent with configurations on the system. 3. Route cables based on requirements in the quick installation guide, ensuring that AC power cables are routed on the left of the cabinet and DC power cables and signal cables are routed on the right of the cabinet. 4. Switch off the battery circuit breaker before you install the battery cable. The TP48200A uses positive grounding. Therefore, connect the negative terminal before you connect the positive terminal, avoiding short circuits on the batteries caused by contact between the screwdriver and the shell.

After the cabinet is installed, block the cable outlets using sealing mud.


3.3 Cabinet Installation — Installing Parts (Continued)

Installing rectifiers

Installing batteries

rectifier rectifiers

rectifiers


3.4 Electrical Installation — Installing Cables

Note: Switch off all circuit breakers including the battery circuit breaker before you install cables.

Cables are installed in the following sequence: ground cable > signal cable > load cable > battery cable > AC input cable.

The ground cable and AC input cable are routed out of the cabinet from the left leading-out hole at the bottom. The signal cable and load cable are routed out of the cabinet from the right leading-out hole at the bottom.

Sequence for installing cables:

Rules for routing cables out of the cabinet:

Installing the ground cable

Example: TP48200A-H15A3 and TP48200A-H15A5 (heat exchange)

Installing a Ground Cable

Ground Cable

Site ground bar


3.4 Electrical Installation — Installing Cables (Continued)


3.5 Verification After Installation

Obtain fireproof mud from the packing box of the cabinet base, block cable holes using fireproof mud, and insert rubber plugs in unused cable holes. Fireproof mud

Leading-out hole


3.6 Power-On and Commissioning

Page47

(1) Manual battery switch (with a cover) (2) SMU02B (3)UIM02C

SMU

PDM


3.6 Power-On and Commissioning (Continued)

Page48

SMU.


3.6 Power-On and Commissioning (Continued)

Page49

SMU


Questions

What installation mode does the TP48200A use?

What is the procedure for installing the TP48200A?

What precautions must be taken before you power on the TP48200A?

What parameters need to be verified before you complete the installation and leave the site?


Contents








Chapter 8 Test


4.1 Preparations for Acceptance

Purpose:

Acceptance is an activity performed after the installation to check whether

the system meets the delivery criteria. It is an important step before delivery.

Generally, customers participate in or authorize the acceptance. Accepted

systems can be delivered to customers.

Document:

The acceptance manual provided by R&D personnel is the basis of the

acceptance.

Acceptance items and criteria, for example, parameter settings, are

determined based on specific requirements.

Tool:

A multimeter is required for testing large currents. Clip-on ammeter Fluke

337 is recommended.


4.2 Acceptance Method

Acceptance process

The acceptance process is as follows: verify the overall installation; verify the

system before power-on; verify the installation of rectifiers; verify the installation

of the SMU; verify the installation of the PDM; verify parameter settings; verify

system functions and performance.

Generally, acceptance of a system power supply is performed based on the

proceeding process. After the acceptance is completed, customers verify and

accept the system.

Method

Verify perceptual items such as overall installation with customer representatives

and ask customer representatives to sign after confirmation.

Verify parameter settings and system performance using a tool such as a

multimeter, record related data, and ask customer representatives to sign after

confirmation.


4.3 Acceptance Criteria

Specific requirements and customer requirements are described:

Specific requirements are described for parameters such as the float voltage,

battery capacity, and power-off parameters. These parameters must be

specified in the acceptance manual as acceptance criteria.

Perceptual items such as appearance and cable management must be

verified and signed by customers after confirmation.

No requirement is specified:

If no requirement is specified, the acceptance must be performed based on

the TP48200A V300R001C03 Power System Acceptance Manual.

For details, see the TP48200A V300R001C03 Power System Acceptance

Manual.


Questions

What is the purpose of the acceptance?

What preparations are required before the acceptance?

What is the acceptance process of the TP48200A?


Contents








Chapter 8 Test


5 Routine Maintenance

This chapter contains the following content:

Objective and principle for maintenance

Requirements for maintenance personnel

Routine maintenance tasks and period

Routine maintenance content and methods for the system power supply

Replacement of key fragile parts


5.1 Objective and Principle for Maintenance

After long-term operating, a power system may fail to function properly or even

become faulty because of part aging, adverse weather such as lightning,

adverse environments, or human factors. To remove the hazards and avoid

system breakdown caused by power supply faults, perform periodic

maintenance for power supplies on the live network.

Principles for the maintenance:

Ensure equipment security and personal safety during the maintenance. For

details, see the TP48200A V300R001C03 User Manual.

Take proper measures to prevent faults from being intensified during the

maintenance.

Note that the objective of maintenance is not only to rectify faults but also to

remove hazards and avoid faults.

Check customer requirements, for example, whether power failures are

allowed.


5.2 Maintenance Personnel

Maintenance personnel must have basic electrical operation skills and electrical

safety knowledge and obtain electrician certificates recognized by the local

government or other organizations. Maintenance personnel in China must have

a low-voltage electrician certificate.

Maintenance personnel must understand the system composition and working

principles and understand the failure modes and maintenance modes of parts

such as AC input modules, rectifiers, DC contactors, SMUs, and circuit

breakers.

Maintenance personnel must understand common operation methods and

consequences of misoperations, avoiding power failures caused by

misoperations during the maintenance.

Maintenance personnel must know how to use common instruments such as

multimeters and oscilloscopes.


5.3 Routine Maintenance Tasks for the System Power Supply

Routine maintenance checklist

Perform preventive maintenance inspection (PMI) against the system power supply every half year. Rectify faults in time during the maintenance. Perform PMI more frequently in harsh environments, for example, an environment with much dust.

Task Content Measures Remarks

Cabinet appearanceThe paint or electroplated coating flakes off and scratches occur.

Repaint or repair the surface.TP48200A V300R001C03

Fan An alarm for a fan failure is generated. Replace the fan.TP48200A V300R001C03

Heat exchanging core

The heat exchanging core, air intake vent, or air exhaust vent is blocked. An alarm is generated for temperature rise in the cabinet.

Clean the exchanging core, air intake vent, and air exhaust vent using a water gun.

TP48200A V300R001C03 heat exchange cabinets

Air filter

The air filter, air intake vent, or air exhaust vent is blocked. An alarm is generated for temperature rise in the cabinet.

Replace the air filter. Perform the maintenance every six to twelve months in favorable environments. Perform the maintenance every three to six months in harsh environments.

TP48200A V300R001C03 natural-ventilation cabinets

Electrical connection Indicators are in normal statusFor details about how to rectify the fault, See chapter 5 "Troubleshooting."

TP48200A V300R001C03


5.3 Routine Maintenance Tasks for the System Power Supply (Continued)

Electrical check

Check the system output voltage over the LUI, Web, or console and measure the

output voltage using a multimeter. Check whether the difference between the

displayed value and the actual value is within 0.5 V. If the output voltage does not

meet the requirements, the system is faulty. Take proper measures to rectify the

fault.

Check the system load current and battery current over the LUI, Web, or console

and measure the current using a clip-on ammeter. Check whether the difference

between the displayed value and the actual value is within 1 A. If the current does

not meet the requirements, take proper measures to rectify the fault.

Check electrical devices such as contactors, circuit breakers, and cables with

your eyes. If any electrical devices are aging or faulty, make records and perform

maintenance.


5.3 Routine Maintenance Tasks for the System Power Supply (Continued)

PMI

Check the monitoring unit. If any alarms are generated, take proper measures

to clear the alarms.

Check indicators on the SMU and rectifiers. When the SMU operates properly,

the green indicator blinks, and the red indicator is off. When a rectifier

operates properly, the green indicator is steady on, and the yellow indicator

and red indicator are off.

If any errors occur, take proper measures by referring to the TP48200A

V300R001C03 User Manual.


5.4 Part Replacement AC SPD

Possible causes of an AC SPD fault are as follows:

The SPD is faulty. In this case, replace the SPD.

The terminal is loose. In this case, tighten the terminal. If the alarm persists, replace the SPD.

The window becomes red when the SPD is faulty. The terminal becomes loose during

the transportation and installation.Replacing an AC SPD:

Remove the faulty AC SPD.

Install a new SPD.


5.4 Part Replacement (Continued)

Replacing a rectifier:

Unscrew the rectifier panel using a flat-head screwdriver.

Gently draw the handle outwards, and then remove the rectifier from the subrack, as shown in Figure 6-1.

Insert a new rectifier into the subrack. Then loosen the screws on the handle and pull out the handle.

Slide the new rectifier into the subrack slowly along the guide rail, and then lock the handle.

Tighten the screws on the handle, as shown in Figure 6-1.


5.4 Part Replacement (Continued)Replacing an SMU:

Push the locking latch towards the left.

Draw the handle outwards to remove the SMU, as shown in Figure 6-3.

Insert a new rectifier into the corresponding subrack, push the locking latch towards the left, and pull out the handle. Gently insert the PW48S24C along the guide rails into the subrack. When the PW48S24C is completely inserted, flip the locking latch towards the right, as shown in Figure 6-1.

Reset parameters on the SMU.


5.4 Part Replacement (Continued)Replacing a circuit breaker:Disconnect the power supply from the circuit breaker. For example, when you replace an input circuit breaker, interrupt the inputs and switch the circuit breaker to the OFF position.Remove the cables or copper bars connected to the circuit breaker using a Phillips screwdriver, and then wrap the cables or copper bars using polyvinyl chloride (PVC) insulation tapes to avoid hazards.Press the contact plate at the bottom of the circuit breaker using a flat-head screwdriver and remove the circuit breaker, as shown in the following figure.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.Install the cables or copper bars on the circuit breaker using a Phillips screwdriver.Switch the circuit breaker to the ON position and connect the power supply to the circuit breaker, as shown in the following figure.

Note:

Do not wear any conductive objects on your hands during the operation.

Use insulation tools during the operation.

Check the polarities of power cables and connectors.

The DC power distribution space is limited. Therefore, select proper operation space before any operation.

When you perform any operations after the system is powered on, control your hands, wrists, arms, and whole body, preventing tools from slipping and therefore avoiding accidents caused by large movement of the tools or human body.


Questions

What tasks does routine maintenance of the TP48200A contain?

How to identify whether the parts are damaged?

How to replace the parts?


Contents








Chapter 8 Test


6.1 Troubleshooting Process of the TP48200A

Start

Observe indicators

End

Is the fault rectified?

YN

Check system statuson the SMU

Perform troubleshooting

Analyze the problem

Formulate a solution

Query system status

Implement the solution Record the operation steps

Note:

If you have trouble identifying

faults and analyzing causes,

see the maintenance manual

and troubleshooting cases.

Record every key step during

solution implementation. Such

key steps are the reference for

reformulating a solution if the

fault is not rectified.


6.2 Common Faults and Troubleshooting MeasuresSymptom Possible Cause Measures

AC power failure The AC input power cable is faulty. The mains supply or D.G. is faulty.

1. If the AC input power cable is not connected properly, reconnect it.2. If the AC input power is unavailable, check that no open or short circuits occur in the AC input loop. If the

AC input loop is normal, contact the mains supplier. If the D.G. provides the AC input, check and repair the D.G. by referring to the D.G. User Manual. If the power failure is for a short time, use storage batteries to power DC-powered loads. When the outage lasts long, use other energy sources to supply power.

AC overvoltage or undervoltage

The AC overvoltage or undervoltage alarm threshold is not set properly on the SMU.

The mains supply or D.G. is faulty.

If the AC overvoltage or undervoltage alarm threshold is not set properly, adjust it to a proper range.If the AC input is mains, for the electrical grid where the mains voltage is greater than the maximum value or less than the minimum value for a long time, negotiate with the related electrical grid maintenance personnel to improve the electrical grid. If the D.G. provides the AC input, check and repair the D.G. by referring to the D.G. User Manual.

DC overvoltage and undervoltage

The DC overvoltage or undervoltage alarm threshold is not set properly on the SMU.

rectifiers faults

Adjust the DC overvoltage or undervoltage alarm threshold to a proper value.Remove all rectifiers and insert them again while ensuring proper AC power supply. If an undervoltage alarm is generated when you connect a certain rectifier, replace this rectifier.

The rectifier is faulty.

The rectifier has poor contact with the monitoring backplane.


Check the fault indicator on the rectifier panel. If the indicator is steady red, the rectifier is faulty. Remove the faulty rectifier and insert it again after a while. If the alarm persists, replace the rectifier. Check for other faulty rectifiers and take proper measures to rectify the faults.

Rectifier protection The input voltage to the rectifier is not in the normal range.


Check whether the AC input voltage is higher than the AC overvoltage threshold (300 V) of the rectifier or lower than the AC undervoltage threshold (85 V) of the rectifier. If the power grid is in an overvoltage or undervoltage condition for a long period, contact maintenance personnel of mains supplier to improve the mains grid. If the input voltage to the rectifier is within the specified range but the alarm persists, replace the rectifier.

Rectifier communication interruption

The signal cable to the rectifier is not connected properly.

The rectifier is not installed. The rectifier has poor contact with the monitoring backplane. The rectifier is faulty. The monitoring backplane is faulty.

Check whether the rectifier is installed and whether it is properly connected. If the SMU is inserted into another position, insert the SMU into the correct position. If the communication of a single rectifier fails, reseat the rectifier on which a yellow indicator is blinking. Check whether the rectifier is securely connected. If yes, replace the rectifier. If the communication of all rectifiers fails, reseat the SMU. Check whether the SMU is securely connected. If yes, replace the SMU. If the alarm persists, replace the AC/DC power distribution subrack.

Charge overcurrent Rectifier communication failure The battery loop is faulty.

Check whether the rectifier is installed in the subrack and whether the rectifier is properly connected. Install the rectifier in the correct subrack. If the SSU has poor contact with the SSR, remove and then insert the SSU, and ensure that the SSU is fastened to the SSR. Check that the battery loop is not faulty or short-circuited. Check the storage batteries and replace faulty ones.

System alarms of the TP48200A are classified into four types: critical alarms, major alarms, minor alarms, and warning alarms.


6.2 Common Faults and Troubleshooting Measures (Continued)Symptom Possible Cause Measures

Load disconnection The load circuit breaker is in the OFF position.

The contactor is faulty. The SMU load disconnection voltage is set too high. The load power is greater than the configured rectifier power, causing a low output voltage.

1.Check whether the load cable is loose.2.If the load circuit breaker is in the OFF position, check whether a short circuit or overcurrent occurs. If no, switch the

load circuit breaker to the ON position.3.Check whether the contactor is faulty and whether the contactor can be connected or disconnected. If the contactor is

faulty or 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 higher than the preset rectifier power. If the load power is higher than the preset rectifier power, add rectifiers. If the load power is greater than the maximum power supported by the TP48200A, reduce the loads.

Battery disconnection The battery parameters are not properly set on the SMU.

The contactor is faulty.

1.If the mains supply fails or the battery voltage is below the BLVD threshold, contact the mains supplier.2.Check that the BLVD is enabled on the SMU. Check the battery cables and connectors, and replace faulty ones. Check

whether the contactor is faulty and whether the contactor can be connected or disconnected. If the contactor is faulty or cannot be connected or disconnected, replace the contactor.

Battery root open sensor

The battery loop is faulty. The contactor is faulty. The storage

batteries are faulty.

1.Check the battery cables and connectors on the battery loop, and replace faulty ones.2.Check whether the contactor is faulty and whether the contactor can be connected or disconnected. If the contactor is

faulty or cannot be connected or disconnected, replace the contactor. Check the storage batteries and replace faulty ones.

Overhigh or over low ambient temperatureThis alarm can be generated only when an ambient temperature sensor is installed.

The alarm threshold for ambient temperatures is not properly set on the SMU.

The temperature inside the shelter where the ambient temperature sensor is installed is beyond a normal range. The temperature sensor is faulty.

1.Check that the alarm threshold for ambient temperatures is properly set on the SMU.2.Repair the temperature control system in the shelter if it is faulty. After the temperature inside the shelter is adjusted to a

normal range, the alarm is automatically cleared. If the alarm still persists, check whether the temperature sensor is faulty.

Overhigh or over low ambient humidityThis alarm can be generated only when a humidity sensor is installed.

The alarm threshold for ambient humidity is not set properly on the SMU.

The humidity inside the shelter that houses the humidity sensor is not in the normal range. The humidity sensor is faulty.

1.Check that the alarm threshold for ambient humidity is properly set on the SMU.2.If there is water in the shelter, remove water by using a dry cotton cloth or dehumidifier. If the ambient humidity is within a proper range but the alarm persists, check the humidity sensor. If the humidity sensor is faulty, replace it.

Overhigh or over low battery temperatures

Temperature inside the battery compartment is greater than the maximum value.

The alarm threshold of battery temperature is not properly set on the SMU. The charge current of storage batteries is too high. The temperature sensor is faulty.

1.Check that the alarm threshold for battery temperatures is properly set on the SMU.2.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. If the charge current is greater than the maximum value, change equalized charging into float charging and check whether the charge current is lowered. If the charge current is still overhigh, reduce the charge current. If the battery temperature is still too high, replace faulty storage batteries.


6.2 Common Faults and Troubleshooting Measures (Continued)Symptom Possible Cause Measures

Door status alarm(This alarm can be generated only when a door status sensor is installed.)

The cabinet door is open.

The door status sensor is faulty.

1. Close the cabinet door.2. If the alarm persists after the cabinet door is closed, check and repair the door status

sensor.

Water sensor alarm(This alarm is generated when a water sensor is installed.)

There is water in the shelter.

The water sensor is faulty.

1. If there is water in the shelter, remove water by using a dry cotton cloth or dehumidifier.

2. If there is no water but this alarm persists, check and repair the water sensor.

Smoke sensor alarm(This alarm can be generated only when a smoke sensor is installed.)

There is smoke in the shelter.

The smoke sensor is faulty.

1. If there is smoke in the shelter, put out the fire immediately and open the shelter door for ventilation.

2. If there is no smoke but the alarm persists, check and repair the smoke sensor.

Load fuse blown

The load fuse is blown.

The load circuit breaker is in the OFF position.

1. Check whether the detection cable of the load fuse is loose.2. Check whether the load circuit breaker is in the OFF position. If it is, switch it to the

ON position. If the alarm persists after the circuit breaker is set to ON, check the load fuse. If the voltage between both ends of the fuse is close to 0 V, the fuse is functional. Otherwise, the fuse is blown. Then 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.

AC SPD fault The AC SPD is faulty.

Observe the indication window on the AC surge protection module. If it turns red, replace the surge protection module. If it remains green, check whether the cable for detecting AC SPD faults is connected properly and whether the cable is damaged or cracked. If the cable is not connected properly or is faulty, replace the cable and connect it properly. If the cable is connected properly and in good condition, the alarm loop in the SMU is faulty. Then replace the SMU.


6.2 Common Faults and Troubleshooting Measures (Continued)Troubleshooting rectifiers

Indicator Color Status Description Solution

Run indicator Green

On Outputs of the rectifier are normal. No operation is required.

Off The rectifier has no output.Check AC inputs. If AC inputs are normal, replace the rectifier.

Alarm indicator Yellow

Off No alarm is generated for the rectifier. No operation is required.

On

A power limiting pre-warning alarm is generated for the rectifier because of an overhigh temperature.

A shutdown alarm is generated because of an overhigh or overlow ambient temperature.

Ensure that the air intake vent and air exhaust vent of the rectifier are not blocked and that the ambient temperature is normal.

An AC overvoltage/undervoltage protection alarm is generated.

Check the voltage of the grid.

The rectifier is hibernated or shut down. No operation is required.

Fault indicator Red

Off The rectifier is operating properly. No operation is required.

OnThe rectifier is locked because of output overvoltage.

Remove the rectifier and insert it again after 1 minute.

The rectifier is faulty and has no output. Replace the rectifier.

Blinking at a frequency of 4 Hz

Applications are being loaded to the rectifier.

No operation is required. The rectifier automatically recovers after the loading is completed.


Questions

What is the basic process of troubleshooting the system power supply?

How to rectify common faults?


Contents








Chapter 8 Test


7.1 Engineering Design — Rectifier Quantity Calculation

Six steps for calculating power system parameters

Determine the following parameters:

Calculate the battery capacity.

Calculate the maximum battery charge current.

Calculate the output power (P∑) required for the system.

Determine the AC-to-DC converter type.

Calculate the number of rectifiers.

Maximum power of DC equipment loads, average power of loads, input power of inverters, and battery backup time

Design requirements

DC load voltage, load power, and battery backup time

Pcmax = Vequalize x η x CN, where η is the charge factor of storage batteries, ranging from 0.1 to 0.2, with the default value of 0.1. The equalized charging voltage is 56.4 V.

P∑ = Max (Pmax + Punit, Pavg + Pcmax)

Select the AC-to-DC power system type based on the power system list.

N = Roundup (0.95 x P∑/Punit – 0.1, 0)Roundup is a function.

Page76


7.2 Engineering Design — Battery Capacity Calculation

In the preceding formula:

C indicates the total battery capacity in the unit of Ah. W is the load power in the unit of watts. In economic configuration,

W equals Pavg, and in standard configuration, W equals Pmax. t indicates the backup time of storage batteries in the unit

of hour. 1.25 indicates the aging coefficient.1.04: voltage coefficient. Vr indicates the rated voltage of the battery string (V).

For –48 V power supply system, set the parameter to 48. For 24 V power supply system, set the parameter to 24. ŋ

indicates the capacity coefficient of the storage battery (related to the discharge hour rate of the storage battery).

Note: C10 refers to 10 hour rate capacity of the storage battery, that is, nominal capacity of the storage battery. In the

formula, the battery capacity coefficient (η) relates to the discharge time (in hours) in –48 V systems. The discharge time

increases in proportion to the value of η. The following table lists the mapping.

The battery capacity can be calculated in the following formula:

Discharge time (hour) 0.5 1 1.5 2 3 4 5 6 8 9 10 12 ≥ 16

η 0.4 0.55 0.63 0.7 0.75 0.8 0.85 0.9 0.95 0.98 1 1.01 1.03

Page77


Cross-sectional area of a conductor

Ampacity (A)





Ampacity (A)

Ampacity (A)

Ampacity (A)

Ampacity (A)

7.3 Engineering Design — Cable Specifications

Note:The preceding tables source from the DKBA3265-2010.12 Power Cable Design and Selection Specification.If the ambient temperature is high, the related data must be derated accordingly. Select cables based on customer requirements.

For details on the AC cable design, see the following tables.

Ampacity of two loaded copper conductors (single-loop) under the following conditions: PVC insulation, conductor temperature of 70 C (158 F), and ambient temperature in the air of 30 C (86 F)

Ampacity of two loaded copper conductors (single-loop) under the following conditions: cross-linked polyethylene (XLPE) insulation, conductor temperature of 90 C (194 F), and ambient temperature in the air of 30 C (86 F)

Page78


Ampacity (A)





Ampacity (A)

Ampacity (A)

Ampacity (A)

Ampacity (A)


7.3 Engineering Design — Cable Specifications (Continued)

Voltage drop is involved in DC cable configuration. The DC cable must be configured based on the following formulas.

The cross-sectional area of a power cable can be calculated in the following formula:

U

LIS

*

*

In the preceding formula:

I is the working current of the equipment in the unit of Ampere (A). L is the loop length of the power cable in the unit of meter (m). This value is set based on the actual survey. γ is the electrical conductivity of copper conductors, equal to 57 m/Ω·mm 2.

ΔU is the voltage drop value of the loop, with the unit of V. For the value of this parameter, see the following figure. S is the cross-sectional area of the power cable, with the unit of mm2. The calculation result must be rounded up to a standard value. For example, if the calculation result is 14.8 mm2, it must be rounded up to the standard value 16 mm2.

Rated operating voltage

of equipment

–48 V +24 V

Minimum input voltage of

equipment

38.4 V 40 V 19.2 V 20 V

ΔU 2.6 V 1.0 V 1.3 V 0.4 V

Note: The preceding table sources from the DKBA3265-2010.12 Power Cable Design and Selection

Specification. Select cables based on customer requirements.

Page79


Installation position and environment of the power cabinet: describes the altitude, position, and surrounding environment of the equipment room.Power supply: involves the power supply mode, position of the AC power distribution cabinet, cable routing, and cabling distance.Power load: involves the load position and distance between the load and the power system.Installation materials: involves the calculation of installation materials.

Huawei engineers and customer engineers conduct the engineering survey. Huawei and

customers determine the installation place, cable layout, and installation materials and

specifications. After onsite survey and data collection are completed, the customer

representative and Huawei project preventative sign the onsite survey report and data

collection report.

7.4 Engineering Survey

Page80


Questions

How to calculate the number of rectifiers?


Contents








Chapter 8 Test


8 Test

In a system test, measures (visual inspection or using instruments) are taken

to check whether the performance, functions, and serviceability of a product

meet the design requirements. Product tests after GA are performed to show

the compliance of tested equipment with customer specifications.

Product tests after GA are admission tests performed based on customer

requirements to strengthen customers' confidence.


8.1 Test Network of the System Power Supply

AC power supply

Power analyzer

TP48200A Multimeter DC load

Current divider

Storage battery

PC

Oscilloscope


8.2 Test Instruments

Power analyzer: obtains AC input information, such as AC input voltage,

current, power, THD, and PF, and is mandatory. The model of WT1600 is

recommended.

Multimeter: obtains the output voltage, input voltage, and dry contact status.

Fluke 87 multimeter is recommended. Current divider: obtains system output

current. It is mandatory for efficiency tests. The clip-on ammeter (for

example, Fluke 337) can be used based on customer requirements.

Oscilloscope: monitors the system output voltage. Generally, it is not

required. The model of Agilent 5014 is recommended.

DC load: functions as the system load. It can be a resistance load or an

electronic load.

PC: monitors and controls the system, communicates with the host, and

verifies communication with the host.


8.3 Common Test Items

Efficiency

Efficiency is a key index of a system. It indicates the power conversion efficiency

of a system. It can be calculated in the following formula: η = Po/Pin.

Obtain the system input power (Pin) on the power analyzer.

Obtain the output current (Io) on the current divider. Obtain the output voltage

(Uo) on the multimeter. Po is equal to Uo multiplied by Io.

Obtain the system input THD and PF on the power analyzer. Test and record the

efficiency, THD, and PF under different input voltages (85% Un, Un, or 110% Un)

and loads (10% to 100%).


8.3 Common Test Items (Continued)

Unbalance of load sharing

Unbalance of load sharing indicates the load sharing status among all rectifiers in

a system. Generally, it is no more than 5%.

Obtain the output current (Io1, Io2, ..., Ion) of each rectifier on the SMU.

Obtain the system output current (Io) on the current divider.

Record the rated current of each rectifier as In1, In2, ..., Inn.

I = In1 + In2 + ... + Inn

Unbalance of load sharing = max (abs (Io1/In1 – Io/I), abs (Io2 – Io/I), ..., abs

(Ion/Inn – Io/I)

Test and record the unbalance of load sharing under different output voltages and

loads.



Peak-to-peak noise voltage

The peak-to-peak noise voltage indicates the ripple content of the system

output voltage. It is a key index of the system output performance.

Use an oscilloscope to test the peak-to-peak noise voltage.

Set the bandwidth of the oscilloscope to 20 MHz. (Operations vary based on

oscilloscopes. For details, see the oscilloscope specifications.) Select the AC

coupling mode.

Set the time axis of the oscilloscope to 5 seconds per scale. Obtain the peak-to-

peak value (namely, the peak-to-peak noise voltage) on the oscilloscope.

Test and record the peak-to-peak noise voltage under different output voltages

and loads.



Others

Space is limited. Therefore, some test items are not described here.

For more test items, see the attachment.

For details about the test methods, see the DKBA 2038-2010.11 AC-to-DC

Power system Test Specification.

TP48200A V300R001C03 Test Item Manual.xl


Questions

What is the purpose of performing the system test?

What basic test instruments are required for performing a system test? How to perform an efficiency test?


Summary

This slide describes the development history of AC-to-

DC converters and the positioning of Huawei power

supply series. It describes the TP48200A in terms of its

system composition, working principles, installation and

commissioning, acceptance, routine maintenance,

troubleshooting, engineering design, and system tests.

It provides reference for customer service engineers in

site design, installation and maintenance,

troubleshooting, and customer tests.

www.huawei.com

Thanks!

tp48200a v300r001c03 training slide_v1.0

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