Rockwell Automation 1407-CGCM Combination Generator Control Module - Manual (Page 154)

154 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013
Chapter 7 Troubleshooting
Voltage output is greater than
setpoint
AVR not selected / enabled Check excitation AVR select Correct Logix controller logic or I/O
as required
Wiring error Check wiring for excitation current
output, VT inputs, fuses open,
grounding, and PMG/supply
Correct wiring as required
Gain mis-adjusted Check gains entered into CGCM unit
configuration
Calculate / adjust as required
Excitation limiting active Check UEL active input Correct UEL configuration or change
operating point
Droop compensation is driving up
the voltage
Check Droop Enable Adjust/disable droop compensation
Voltage is erratic or unstable Gain mis-adjusted Check gains entered into CGCM unit
configuration
Calculate / adjust as required
Wiring error Check wiring for excitation current
output, VT inputs, fuses open,
grounding, and PMG/supply
Correct wiring as required
Prime mover is unstable Check prime mover governor
operation
Correct as required
Excitation limiting active Check UEL/OEL active input Correct UEL/OEL configuration or
change operating point
Table 20 - Excitation Control - AVR
Symptom Most Likely Cause Diagnostic Action Corrective Action