P.11.44
SEL-411L Relay Protection Manual Date Code 20151029
Testing and Troubleshooting
Relay Troubleshooting
Table 11.15 Troubleshooting Procedures (Sheet 1 of 3)
Possible Cause Diagnosis/Solution
Dark Front Panel
Power is off. Verify that substation battery power is
operational.
Input power is not present. Verify that power is present at the rear-panel
terminal strip.
Blown power supply fuse. Replace the fuse (see Power Connections on
page P.2.32).
Poor contrast adjustment. Press and hold ESC for two seconds. Press Up
Arrow and Down Arrow pushbuttons to adjust
contrast.
Status Failure Notice on Front Panel
Self-test failure. Contact the SEL factory or your Technical
Service Center.
The OUT108 relay control output b contacts will
be closed if you programmed NOT HALARM to
OUT108 (see Alarm Output on page P.2.34).
Alarm Output Asserts
Power is off. Restore power.
Blown power supply fuse. Replace the fuse (see Power Connections on
page P.2.32).
Power supply failure. LCD displays
STATUS FAILURE screen.
Contact the SEL factory or your Technical
Service Center.
Main board or interface board failure. LCD displays
STATUS FAILURE screen.
Contact the SEL factory or your Technical
Service Center.
Other self-test failure. LCD displays
STATUS FAILURE screen.
Contact the SEL factory or your Technical
Service Center.
System Does Not Respond to Commands
No communication. Confirm cable connections and types. If correct,
type <Ctrl+X> <Enter>. This resets the
terminal program.
Communications device is not
connected to the system.
Connect a communications device.
Incorrect data speed or other
communications parameters.
Configure your terminal port parameters to the
particular relay port settings. Use the front panel
to check port settings (see Set/Show on
page P.7.28).
Incorrect communications cables. Use SEL communications cables, or cables you
build according to SEL specifications (see
Communication Ports on page P.2.37).
Communications cabling error. Check cable connections.
Handshake line conflict; system is
attempting to transmit information,
but cannot do so.
Check communications cabling. Use SEL
communications cables, or cables you build
according to SEL specifications (see
Communication Ports on page P.2.37).
System is in the XOFF state, halting
communications.
Type <Ctrl+Q> to put the system in the XON
state.
NOTE: If Port setting
PROTO := PMU, that serial port will
not respond to ASCII commands.
Additionally, a PROTO := PMU port
will not respond to any messages
when Global setting EPMU := N.
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