Allen-Bradley 1407-CGCM, User Manual, Page: 153 / 252

Rockwell Automation Publication 1407-UM001H-EN-P - November 2014
#HAPTER
4ROUBLESHOOTING
This chapter lists suggested diagnostic and corrective action procedures for a
variety of common generator system malfunctions. If the suggested actions do not
resolve the anomaly, please contact Rockwell Automation technical support.
Information on Rockwell Automation support can be found on the back cover.
This chapter does not include procedures to diagnose or correct issues related to
the basic communication between the CGCM unit and its host Logix controller.
For assistance in diagnosing ControlNet network communication issues, please
refer to ControlNet Coax Media Planning and Installation, publication
CNET-IN002 .
4ABLE%XCITATION#ONTROL&#2
3YMPTOM -OST,IKELY#AUSE $IAGNOSTIC!CTION #ORRECTIVE!CTION
No excitation current output Excitation is not enabled Check excitation enable (hardware
and software) and FCR select Correct Logix controller logic or I/O
as required
Wiring error Check wiring for excitation enable,
excitation current output, fuses
open, grounding, and PMG/supply Correct wiring as required
No supply/PMG power Measure Voltage at CGCM unit
PMG/supply input terminals Correct supply anomaly if
insufficient voltage is measured
Excitation output is less than
setpoint FCR not selected/enabled Check excitation enable (hardware
and software) and FCR select Correct Logix controller logic or I/O
as required
Wiring error Check wiring for excitation enable,
excitation current output, fuses
open, grounding, and PMG/supply Correct wiring as required
Insufficient supply power Measure Voltage at CGCM unit
PMG/supply input terminals Correct supply anomaly if
insufficient voltage is measured
Field resistance too great Disconnect field current outputs at
CGCM unit and measure load
resistance Correct/verify load resistance is
within CGCM unit capability
Gain mis-adjusted Check gains entered into CGCM unit
configuration Calculate/adjust as required