10-44 Testing and Troubleshooting Date Code 20080110
SEL-387E Instruction Manual
R
ELAY
T
ROUBLESHOOTING
Inspection Procedure
Complete the following procedure before disturbing the relay. After you finish the inspection,
proceed to the Troubleshooting Procedure.
1.
Do not turn the relay off.
2.
Check to see that the power is on.
3.
Measure and record the power supply voltage at the power input terminals.
4.
Measure and record the voltage at all control inputs.
5.
Measure and record the state of all output relays.
Troubleshooting Procedure
All Front-Panel LEDs Dark
1.
Power is off.
2.
Blown power supply fuse.
3.
Input power not present.
4.
Self-test failure.
5.
TAR F
command improperly set.
Note:
For 1, 2, 3, and 4 the ALARM relay contacts should be closed.
Cannot See Characters on Relay LCD Screen
1.
Relay is de-energized. Check to see if the ALARM contact is closed.
2.
LCD contrast is out of adjustment. Use the steps below to adjust the contrast.
a) Press any front-panel button. The relay should turn on the LCD back lighting.
b) Locate the contrast adjust hole behind the front panel beside the serial port. (This
requires unscrewing and removing the front-panel plate.)
c) Insert a small screwdriver in this hole to adjust the contrast.
Relay Does Not Respond to Commands From Device Connected to Serial Port
1. Communications device not connected to relay.
2. Relay or communications device at incorrect baud rate or other communication parameter
incompatibility, including cabling error.
3. System is processing event record. Wait several seconds.
4. System is attempting to transmit information but cannot because of handshake line conflict.
Check communications cabling.
5. System is in the XOFF state, halting communications. Type
<Ctrl + Q>
to put system in
XON state.
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