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RECTIFIERS

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AIM

• To Increase the Technical Knowledge about basic function of Rectifier and Battery Backup,

• To know about different types of rectifiers installed in BTS cell sites and BSC’s

• To know about the un-interrupted power supplied to the system.

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Table of Contents

• Basic Working of Rectifiers

• Classification of Rectifiers

• Low Voltage Disconnect LVD

• Battery Bank

• Grounding of Rectifiers

• Precautions and Safety

• Tools Required

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Basic Working of Rectifiers

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Basic Working of Rectifiers

Half – Wave RectificationFull – Wave Rectification

(Bridge Rectification)

3 – phase input AC Supply 3 – phase Full wave rectification3 – phase half wave rectification

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Basic Working of Rectifiers

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Classification of Rectifiers

Various types of Rectifiers are classified as:

1- Eltek Flat Pack Rectifier – 1500

2- Delta Rectifier– 1200watts & 2000watts

3- Emerson Rectifier

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Eltek Flat Pack 1500

General Specifications:

• 1 & 3 phase AC Input Voltage

• 15 KWatts, 48VDC supply Output

• 8 Modules Capacity (1500watts, 30Amps each)

• Monitoring and Control Unit MCU

• 10+2 C.B’s (16 and 32 Amps)

• Protection against Surges (lightning or switching transients)

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Brief System Description - Eltek

Rectifier Module – Eltek

Equipment Features

• Front LED Indicators (0 to 29A bar graph, Power & Alarm indication)

• Wide Input Voltage Range (85 VAC to 300 VAC)

• Automatic Shutdown at high input voltages

• Power Factor close to Unity

• High Efficiency (above 90% at 230VAC)

•Temperature monitoring, Automatic shutdown at high internal temperatures.

• Constant power charging during battery recharge

• Front Accessible Potentiometer (output voltage adjust)

• 2 – Front Fan Cooled Rectifier units

Equipment Features

• RS232 Serial Interface from local PC/modem (Engineer’s Password – 0000)

• Menu – driven operation via front key pad & display

• Current & Voltage output monitoring

• Voltage level adjustment

• Temperature compensated charging

• Manual/Automatic boost charging

• Battery monitoring and testing

• Low voltage battery and load disconnect (LVD 1&2)

• Storage and reporting of Env. and system Alarms

• Adjustable Alarm Limits

Monitoring & Control Unit (MCU)

User Options (General Users)

• Switch the System ON/OFF

• Resetting Alarms

• Display important System Voltages

• NormVolt• BoostVolt• LowBatt 1 & 2• HighBatt 1 & 2• LVD 1 & 2

• Display Alarm Messages

• Display System Software’s and version number

Menu Structure for MCUService Options (Authorized Users)

• Authentication Password (0000 or user defined)

• Adjustment of Important System Voltages• NormVolt• BoostVolt• LowBatt 1 & 2• HighBatt 1 & 2• LVD 1 & 2

• Change of Service Options Passwords

• Setting of Boost Function duration

• Start or Stop Boost Function

• Selection of type of Output Control• Preset Rect.Volt• Temp.Comp.• Voltage Control

• Set Date and Time• Alarm/Message Logs• Automatic Battery Test• Modem Callback

Delta Rectifiers – 1200/2000watts

General Specifications: • 1 & 3 phase AC Input Voltage Supply

• 1200Watts, 48VDC Output Supply

• 2000Watts, 48VDC Output Supply

• 6 Modules Capacity (1200watts, 28Amps each)

• 8 Modules Capacity (2000watts, 46Amps each) • Power System Controller PSC-1000

• 8+2 C.B’s (16 and 32 Amps)

• 4 Surge Voltage Protection Arrestor units

Power System Controller PSC-1000

Equipment Features

• Engineers Password

• Remote Alarming (system & environment)

• System Calibrations

• System Voltage Programming and control

• Alarm Stop

• Remote access (terminal and MODEM)

• RS – 232 user interface

• Serial Bus cable for COBOMO to PSC

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COBOMO Card & Remote Alarms

Rectifier – 1200 Watts

Rectifier 2000watts

Menu Structure for PSC 1000Main Menu Structure (General Users)

• Display

• Protocol (events and alarms)

• General

• Alarms

• System Voltage USYS

• Temp Comp

• Boost Charge

• Battery Test

• Equalize

• SAE

• Auxiliary

• PC/Modem

Configuration/Extended Configuration

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Emerson Rectifiers

Rectifier Unit Emerson

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Power Control Unit PCU

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Menu Structure PCU

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Low Voltage Disconnect Relay LVD

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Batteries

12 V Batteries in Series 12 V Batteries in Parallel

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Types of Batteries

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Battery Bank

Grounding

Grounding of Rectifiers

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Safety Precautions

Tools

THANKS