Rockwell Automation 1407-CGCM Combination Generator Control Module - Manual (Page 118)

118 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013
Chapter 5 CGCM Unit Startup
5. Confirm that the CGCM unit reports appropriate error signals and issues
a close command when appropriate.
Verify Applicable Automatic Operating Modes
The CGCM unit has these automatic operating modes:
• Droop (reactive current compensation) Operation
• Cross Current (reactive differential compensation) Operation
• VAR Control
• PF Control
• Real Power Load Sharing Operation
Droop (reactive current compensation) Operation
Perform this test with the generator operating in parallel with a large power
source that is maintaining constant voltage. You could also use one or more
additional generators.
Follow these steps to test Droop operation.
1. Adjust the prime mover to maintain constant real power.
2. Adjust the voltage setpoint with the CGCM unit in Voltage Droop mode.
3. Monitor the reactive power and verify that the measured reactive power
changes by the expected amount.
Cross Current (reactive differential compensation) Operation
Perform this test with the generator operating in parallel with a large power
source that is maintaining constant voltage. You could also use one or more
additional generators.
Follow these steps to test the cross current operation.
1. Safely disconnect the cross-current loop (reactive differential
inter-connection) with parallel machines.
The cross-current CT for the generator under test must remain connected
to its CGCM unit.
2. Adjust the prime mover to produce a constant power of approximately
25% of rated output with the voltage control in AVR Droop mode.
EXAMPLE
If the droop setpoint is 5%, and the voltage setpoint is changed
by 1%, the expected change in reactive power is 20% of rated
kVA.