Rockwell Automation 1407-CGCM Combination Generator Control Module - Manual (Page 123)

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 123
CGCM Unit Startup Chapter 5
5. Set the Shorted Diode Level to a value that is 50 times the highest normal
percent ripple found above.
The multiplier can be varied from 40…70 to adjust the trip margin.
Regardless of the calculated value, the level has a maximum value of 70.
Reducing the multiplier could result in nuisance EDM shorted diode
indications.
6. Set the EDM time delays as desired.
7. Disable excitation and shut down the prime mover.
8. Disconnect one diode to create an open diode condition.
9. Start the prime mover, enable excitation and verify that the CGCM unit
annunciates an open diode fault.
10. Disable excitation and shut down the prime mover.
11. Reconnect the diode disconnected above.
12. Start the prime mover, enable excitation and verify that the CGCM unit
no longer annunciates an open diode fault.
Document Configuration
Parameter and Wiring
Changes When all tests have been performed and all adjustments are complete, use the
configuration record to document the installed configuration. Use the system
design documentation to clearly identify any required changes made to CGCM
unit’s related wiring.
See Appendix F for the configuration record.