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Chapter 7
Troubleshooting
Table 19 - Excitation Control - FCR
Symptom
Excitation output is greater than
setpoint
Excitation is erratic/unstable
Table 20 - Excitation Control - AVR
Symptom
No excitation current output
164
Most Likely Cause
FCR not selected/enabled
Wiring error
Gain mis-adjusted
Gain mis-adjusted
Wiring error
Most Likely Cause
Excitation is not enabled
Wiring error
No supply/PMG power
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
Diagnostic Action
Check excitation FCR select
Check wiring for excitation current
output, fuses open, grounding, and
PMG/supply
Check gains that are entered into
CGCM-DLR unit configuration
Check gains that are entered into
CGCM-DLR unit configuration
Check wiring for excitation enable,
excitation current output, fuses
open, grounding, and PMG/supply
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
Corrective Action
Correct Logix controller logic or I/O
as required
Correct wiring as required
Calculate/adjust as required
Calculate/adjust as required
Correct wiring as required
Corrective Action
Correct Logix controller logic or I/O
as required
Correct wiring as required
Correct supply anomaly if
insufficient voltage is measured
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