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Generator Undervoltage (27)
Follow these steps to test that the Generator undervoltage function is working
properly.
1. Connect a suitable load to the excitation output terminals of the
CGCM-DLR unit.
2. Increase the generator undervoltage setpoint to a level that causes an alarm.
3. Enable excitation in FCR mode.
4. Clear the EngineIdle tag in the controller tag database.
5. Apply simulated generator voltage signals by using the test voltage source.
6. Adjust the simulated generator voltage below the generator undervoltage
setpoint.
7. Verify that a generator undervoltage alarm is annunciated following the
expected delay.
8. Reset the generator undervoltage 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-DLR 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 unit from FCR to AVR mode.
6. Reduce one or more generator VT sensing inputs to less than 30% of the
AVR setpoint.
IMPORTANT
7. Verify that a generator loss of sensing alarm is annunciated following the
expected delay.
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
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-DLR unit, exciter field, or
simulated load.
CGCM-DLR Unit Startup
Chapter 5
125
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