Date Code 20000421 Maintenance and Testing 7-31
SEL-251, -2, -3 Instruction Manual
5. Port timeout interval set to a value other than zero.
6. Board failure.
System Does Not Respond to Faults
1. Relay improperly set. Review your settings with the SHOWSET command.
2. Improper test settings.
3. PT or CT input cable wiring error.
4. Analog input cable between transformer-termination and main board loose or defective.
5. Check self-test status with STATUS command.
6. Check input voltages and currents with METER command and TRIGGER and EVENT
sequence.
Terminal Displays Meaningless Characters
1. Baud rate set incorrectly. Check terminal configuration. See Section 3: Communications.
Self-Test Failure: +5 Volts
1. Power supply +5 volt output out of tolerance. See STATUS command in Section 3:
Communications.
2. A/D converter failure.
Self-Test Failure: +15 Volts
1. Power supply +15 volt output out of tolerance. See STATUS command in Section 3:
Communications.
2. A/D converter failure.
Self-Test Failure: -15 Volts
1. Power supply -15 volt output out of tolerance. See STATUS command in Section 3:
Communications.
2. A/D converter failure.
Self-Test Failure: Offset
1. Offset drift. Adjust offsets.
2. A/D converter drift.
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