11.17
Date Code 20170927 Instruction Manual SEL-751 Relay
Testing and Troubleshooting
Factory Assistance
Factory Assistance
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Schweitzer Engineering Laboratories, Inc.
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The relay does not respond to commands from a device connected to the serial port.
Cable is not connected. Verify the cable connections.
Cable is not the correct type. Verify the cable pinout.
The relay or device is at an incorrect data rate or has another
parameter mismatch.
Verify Device software setup.
The relay serial port has received an XOFF, halting communi-
cations.
Type <Ctrl+Q> to send the relay XON and restart communica-
tions.
The relay does not respond to faults.
The relay is improperly set. Verify the relay settings.
Improper test source settings Verify the test source settings.
Current or voltage input wiring error Verify input wiring.
Failed relay self-test Use the front-panel
RELAY STATUS function to view self-test
results.
Table 11.9 Troubleshooting (Sheet 2 of 2)
Symptom/Possible Cause Diagnosis/Solution
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