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Table 20 - Excitation Control - AVR
Symptom
Voltage output is less than setpoint
Most Likely Cause
AVR not selected/enabled
Wiring error
Insufficient supply power
Generator not up to rated speed
Field resistance too great
Gain mis-adjusted
Excitation limiting active
Droop compensation is driving down
the voltage
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
Diagnostic Action
Check excitation enable (hardware
and software) and AVR select
Check wiring for excitation enable,
excitation current output, VT inputs,
fuses open, grounding, and
PMG/supply
Measure Voltage at CGCM-DLR unit
PMG/supply input terminals
Measure generator residual voltage
(shunt excitation)
Check generator speed
Disconnect field current outputs at
CGCM-DLR unit and measure load
resistance
Check gains that are entered into
CGCM-DLR unit configuration
Check OEL active input
Check Droop Enable
Troubleshooting
Chapter 7
Corrective Action
Correct Logix controller logic or I/O
as required
Correct wiring as required
Correct supply anomaly if
insufficient voltage is measured
If less than 10V AC, consult
generator manufacturer
documentation and update the
generator field
Increase generator speed to rated
speed
Correct condition preventing rated
speed from being attained
Correct/verify load resistance is
within CGCM-DLR unit capability
Calculate/adjust as required
Correct OEL configuration or change
operating point
Adjust/disable droop compensation
165
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