Table of Contents
Advertisement
Chapter 7
Troubleshooting
Table 20 - Excitation Control - AVR
Symptom
Voltage output is greater than
setpoint
Voltage is erratic or unstable
166
Most Likely Cause
AVR not selected / enabled
Wiring error
Gain mis-adjusted
Excitation limiting active
Droop compensation is driving up
the voltage
Gain mis-adjusted
Wiring error
Prime mover is unstable
Excitation limiting active
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
Diagnostic Action
Check excitation AVR select
Check wiring for excitation current
output, VT inputs, fuses open,
grounding, and PMG/supply
Check gains that are entered into
CGCM-DLR unit configuration
Check UEL active input
Check Droop Enable
Check gains that are entered into
CGCM-DLR unit configuration
Check wiring for excitation current
output, VT inputs, fuses open,
grounding, and PMG/supply
Check prime mover governor
operation
Check UEL/OEL active input
Corrective Action
Correct Logix controller logic or I/O
as required
Correct wiring as required
Calculate / adjust as required
Correct UEL configuration or change
operating point
Adjust/disable droop compensation
Calculate / adjust as required
Correct wiring as required
Correct as required
Correct UEL/OEL configuration or
change operating point
Advertisement
Table of Contents
