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Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
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 that are entered into
CGCM-DLR 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 that are entered into
CGCM-DLR 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