Rockwell Automation 1407-CGCM Combination Generator Control Module - Manual (Page 111)

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 111
CGCM Unit Startup Chapter 5
7. Verify that a generator under-voltage alarm is annunciated following the
expected delay.
8. Reset the generator under-voltage setpoint to the desired level.
Loss of Sensing (60FL)
Follow these steps to test that the Loss of Sensing function is working properly.
1. Connect a suitable load to the excitation output terminals of the CGCM
unit.
2. Enable excitation in FCR mode with an FCR setpoint greater than the loss
of field current setpoint.
3. Apply simulated generator voltage signals by using the test voltage source.
4. Adjust the AVR setpoint equal to the simulated generator average
line-to-line voltage.
5. Switch the CGCM unit from FCR to AVR mode.
6. Reduce one or more generator VT sensing inputs to less than 30% of the
AVR setpoint.
7. Verify that a generator loss of sensing alarm is annunciated following the
expected delay.
IMPORTANT
During this step excitation output increases to the OEL limiting
setpoint (if configured) or the maximum output. Exercise caution
so that no damage occurs to the CGCM, exciter field or simulated
load.