P.11.45
Date Code 20151029 Protection Manual SEL-411L Relay
Testing and Troubleshooting
Relay Troubleshooting
Terminal Displays Meaningless Characters
Data speed is set incorrectly. Check the terminal parameters configuration
(see Communication Ports on page P.2.37).
Terminal emulation is not optimal. Try other terminal types, including VT-100 and
VT-52 terminal emulations.
System Does Not Respond to Faults
Relay is set improperly. Review the relay settings.
Improper test settings. Restore operating settings.
PT or CT connection wiring error. Confirm PT and CT wiring.
Input voltages and currents phasing,
and rotation errors.
Use relay metering. Use the TRI event trigger
command and examine the generated event report.
The analog input (flat multipin ribbon)
cable between the input module board
and the main board is loose or defective.
Reseat both ends of the analog input cable,
observing proper ESD precautions.
Check the relay self-test status. Take preventive action as directed by relay
Status Warning and Status Failure information.
Tripping Output Relay Remains Closed Following a Fault
Auxiliary contact control inputs are
improperly wired.
Check circuit breaker auxiliary contacts wiring.
Control output relay contacts have
burned closed.
Remove relay power. Remove the control output
connection. Check continuity; a contacts will be
open and b contacts will be closed. Contact the
SEL factory or your Technical Service Center if
continuity checks fail.
I/O interface board failure. LCD displays
STATUS FAILURE screen.
Contact the SEL factory or your Technical
Service Center.
Power Supply Voltage Status Warning
Power supply voltage(s) are out-of-
tolerance.
Log the Status Warning. If repeated warnings
occur, take preventive action.
A/D converter failure. LCD displays
STATUS FAILURE screen.
Contact the SEL factory or your Technical
Service Center.
Power Supply Voltage Status Failure
Power supply voltage(s) are
out-of-tolerance.
LCD displays STATUS FAILURE screen.
Contact the SEL factory or your Technical
Service Center.
A/D converter failure. LCD displays
STATUS FAILURE screen.
Contact the SEL factory or your Technical
Service Center.
A/D OFFSET WARN Status Warning
Loose ribbon cable between the input
module board and the main board.
Reseat both ends of the analog input cable.
A/D converter drift. Log the Status Warning. If repeated warnings
occur, contact the SEL factory or your Technical
Service Center.
Master offset drift. LCD displays
STATUS FAILURE screen.
Contact the SEL factory or your Technical
Service Center.
Table 11.15 Troubleshooting Procedures (Sheet 2 of 3)
Possible Cause Diagnosis/Solution
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