Schweitzer Engineering SEL-387-0, Instruction Manual

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10.36
SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
Testing and Troubleshooting
Relay Troubleshooting
Self-Test Failure: +5 V PS
1. Power 5 V output out-of-tolerance.
See STATUS command.
2. A/D converter failure.
Self-Test Failure: +5 V REG
1. Reg5 V output out-of-tolerance. See
STATUS command.
2. A/D converter failure.
Self-Test Failure: –5 V REG
1. Regulated –5 V output out-of-tolerance. See
STATUS command.
2. A/D converter failure.
Self-Test Failure: +12 V PS
1. Power 12 V output out-of-
tolerance. See STATUS command.
2. A/D converter failure.
Self-Test Failure: –12 V PS
1. Power supply –12 V output out-of-
tolerance. See STATUS command.
2. A/D converter failure.
Self-Test Failure: +15 V PS
1. Power 15 V output out-of-
tolerance. See STATUS command.
2. A/D converter failure.
Self-Test Failure: -15 V PS
1. Power supply –15 V output out-of-
tolerance. See STATUS command.
2. A/D converter failure.
Self-Test Failure: Offset
1. Offset drift.
2. A/D converter drift.
3. Loose ribbon cable between transformers
and main board.
Self-Test Failure: ROM
1. Memory failure. Contact the factory.
Self-Test Failure: RAM
1. Failure of static RAM IC. Contact the
factory.
Table 10.5 Troubleshooting (Sheet 3 of 4)
Symptom Diagnosis/Solution