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TABLE OF CONTENTS
SECTION
PAGE
SECTION 5 - THEORY OF OPERATION
5.1
Simplified Diagram Discussion ............................................................................................................... 5-1
5.2
Circuit Description................................................................................................................................... 5-1
5.2.1
A-C Input Circuit................................................................................................................................ 5-1
5.2.2
Main d-c Supply ................................................................................................................................ 5-3
5.2.3
Pass-Element Section....................................................................................................................... 5-3
5.2.4
Voltage Error Amplifier (VEA) ........................................................................................................... 5-3
5.2.5
Current Limit Circuit (CEA) ............................................................................................................... 5-4
5.2.6
Overvoltage Protection Circuit and Current Monitor ......................................................................... 5-4
5.2.7
Auxiliary Supplies.............................................................................................................................. 5-4
5.2.8
Metering Circuit................................................................................................................................. 5-5
5.2.9
Monitoring Circuit .............................................................................................................................. 5-5
SECTION 6 - MAINTENANCE
6.1
General ................................................................................................................................................... 6-1
6.2
Disassembly/Reassembly....................................................................................................................... 6-1
6.2.1
Cover Removal ................................................................................................................................. 6-1
6.2.2
A1 Circuit Board Removal................................................................................................................. 6-1
6.2.3
A5 Terminal Block Board and CR203 and CR204 Access ............................................................... 6-2
6.2.4
A3 Heat Sink Removal...................................................................................................................... 6-2
6.2.5
A4 Overvoltage Protection Circuit Board Removal ........................................................................... 6-2
6.2.6
Reassembly. ..................................................................................................................................... 6-2
6.3
Troubleshooting ...................................................................................................................................... 6-2
6.4
Power Supply Measurements................................................................................................................. 6-4
6.4.1
Required Test Equipment. ................................................................................................................ 6-4
6.4.2
Measurement Instructions................................................................................................................. 6-5
SECTION 7 - ELECTRICAL PARTS LIST AND DIAGRAMS
7.1
General ................................................................................................................................................... 7-1
7.2
Ordering Information............................................................................................................................... 7-1
7.3
Abbreviations Used in Kepco Parts Lists................................................................................................ 7-2
7.3.1
Reference Designators ..................................................................................................................... 7-2
7.3.2
Descriptive Abbreviations ................................................................................................................. 7-2