Allen-Bradley 1407-CGCM, User Manual, Page: 166 / 252

Rockwell Automation Publication 1407-UM001H-EN-P - November 2014
#HAPTER Troubleshooting
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Loss of excitation current (40) Wiring error Check excitation output wiring Correct wiring as required
Gains mis-adjusted Check AVR gains Calculate/adjust gains as required
Over-excitation voltage (59F) Wiring error Check excitation output wiring Correct wiring as required
Gains mis-adjusted Check AVR gains Calculate/adjust gains as required
OEL limit exceeded Check OEL operation Correct as required
Generator over-voltage (59) Rapid loss of large load
Gains mis-adjusted Check AVR gains Calculate/adjust gains as required
Generator under-voltage (27) Over load
Wiring error Check VT wiring. See Voltage
metering trouble shooting Correct wiring as required
Loss of sensing (60FL) Fuse open Check VT fuses Replace as required
Wiring error Check for open connections and
phase rotation reversal Correct wiring as required
Loss of permanent magnet
generator (PMG/Excitation power)
(27) Supply circuit breaker trip/fuse open Check PMG supply. Measure with
voltmeter at CGCM unit PMG input
terminals
Correct/replace PMG input
protection as required
Wiring error Check PMG supply. Measure with
voltmeter at CGCM unit PMG input
terminals Correct wiring as required
PMG failure Check PMG supply. Measure with
voltmeter at CGCM unit PMG input
terminals Repair as required
Incorrect configuration Check single-phase versus 3-phase
selection Correct as required
Reverse var (40Q) Under-excitation Check UEL configuration if required, Correct as required
Incorrect operating mode selected Check selected operating mode for
operating requirements Select as appropriate
Over-frequency (81O) Governor error Correct as required
Under-frequency (81U) Governor error Correct as required
Reverse power (32R) Governor error Correct as required