10.37
Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Testing and Troubleshooting
Relay Calibration
Relay Calibration
The SEL-387 is factory calibrated. If you suspect that the relay is out of
calibration, please contact the factory.
Self-Test Failure: A/D Converter
1. A/D converter failure.
2. RAM error not detected by RAM test.
Self-Test Failure: IO_BRD
1. Interface board has been changed. Execute
the INITIO command.
2. Ribbon cable disconnected between upper
interface board and main board. Reconnect
and execute INITIO command. Step 2 only
applies to the upper interface board in a
relay that has two interface boards.
3. Interface board failure.
Self-Test Failure: CR_RAM, EEPROM, and IO_BRD
1. Self-test detected setting location movement
as a result of Flash firmware upgrade.
Execute R_S command.
2. Main board failure, contact the factory.
Alarm Contacts Closed
1. Power is off.
2. Blown fuse.
3. Power supply failure.
4. Main board or interface board failure.
5. Other self-test failure.
Self-Test Failure: Temp After R_S Command
1. Record STA command and state of all
outputs.
2. Call the factory.
3. Powering down the relay will reset the
logic.
Table 10.5 Troubleshooting (Sheet 4 of 4)
Symptom Diagnosis/Solution
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