10.35
Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Testing and Troubleshooting
Relay Troubleshooting
Relay Does Not Respond to Faults
1. Relay improperly set. Review your settings
with SET and SET G commands.
2. Improper test settings.
3. Current transformer connection wiring
error.
4. Analog input cable between transformer
termination and main board loose or
defective.
5. Check self-test status with STA command.
6. Check input voltages and currents with
MET command and TRI and EVE
sequence.
Time Command Displays the Same Time for Successive Commands
1. The digital signal processor has failed;
contact the factory.
Tripping Output Relay Remains Closed Following Fault
1. Auxiliary contact inputs improperly wired.
2. Output relay contacts burned closed.
3. Interface board failure.
"SELBOOT" on Front Display at Power-Up; Serial Port Warning to Remove Link
1. A jumper has been installed at position
JMP6D.
a. Power down.
b. Remove the jumper.
c. Power up the relay again.
No Prompting Message Issued to Terminal Upon Power Up
1. Terminal not connected to system.
2. Wrong baud rate.
3. Terminal improperly connected to system.
4. SET P AUTO setting set to N (factory
default).
5. Main board or interface board failure.
Terminal Displays Meaningless Characters
1. Baud rate set incorrectly.
2. Check terminal configuration. See
Section 7: Serial Port Communications
and Commands.
Table 10.5 Troubleshooting (Sheet 2 of 4)
Symptom Diagnosis/Solution
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