Allen-Bradley 1407-CGCM, User Manual, Page: 111 / 252

Rockwell Automation Publication 1407-UM001H-EN-P - November 2014
CGCM Unit Startup #HAPTER
3IMULATE!#'ENAND"US)NPUTSAND6ERIFY-ETERED0ARAMETERS
Follow these steps to simulate the AC Gen and Bus inputs and verify the metered
parameters.
1. Disconnect Generator VT and CT inputs, and Bus VT inputs, in a
manner that lets you verify as much of the system wiring as practical.
Ideally, this is done at the VTs for voltage inputs and at the CT shorting
blocks for the CT inputs (after suitably shorting the CTs).
2. Apply known signals to each of the VT and CT inputs by using the test
current and voltage source.
This can be done one at a time or simultaneously depending upon the
source available.
3. Observe the scheduled and unscheduled data returned to the controller
from the CGCM unit with RSLogix 5000 software.
4. Verify that the metered values correctly reflect the simulated signal inputs.
If errors are found, make the necessary wiring or configuration corrections.
3TATIC4ESTSOF0ROTECTIVE&UNCTIONS
These tests can be performed to verify the applicable protective functions of the
CGCM unit. These tests can require the use of the test current and voltage
source. Some tests can require a load on the CGCM unit’s exciter output. This
load can be either the generator exciter field or a simulated load.
,OSSOF%XCITATION#URRENT
Follow these steps to test that the Loss of Excitation current function is working
properly.
1. Connect a suitable load to the excitation output terminals of the CGCM
unit.
2. Set the loss of field current setpoint to a level that causes an alarm.
3. Enable excitation in FCR mode with an FCR setpoint less than the loss of
field current setpoint.
4. Verify that a field loss alarm is annunciated following the expected delay by
viewing the appropriate controller tag.
5. Reset the loss of field setpoint to the desired level.