Allen-Bradley 1407-CGCM, User Manual, Page: 80 / 252

Rockwell Automation Publication 1407-UM001H-EN-P - November 2014
#HAPTER CGCM Unit Configuration
%XCITATION4AB
The Excitation tab is used to configure the unit’s settings related to operation and
protection of the exciter.
•
Soft Start Initial Voltage - The generator voltage setpoint that is applied
immediately after enabling the CGCM unit excitation output. This
parameter is stored in tag
SoftStart_InitLevel in the Configuration table.
Its value is a percentage of the nominal generator rated voltage. Take care
to set this parameter higher than the generator residual voltage.
•
Soft Start Time - The desired time to ramp up from the Soft Start Initial
Voltage to the nominal generator output voltage. This parameter is stored
in tag
SoftStartTime in the Configuration table and is expressed in
seconds.
•
Over-excitation Voltage Setpoint - Establishes the over-excitation voltage
setpoint used by the CGCM unit. This setpoint is stored in tag
OvrExcV_Setpt in the configuration table and scaled in volts.
•
Over-excitation Time Delay - Establishes the time to annunciate a fault
once the over-excitation voltage setpoint has been exceeded. This setpoint
is stored in tag
OvrExcV_TimeDly in the configuration table and scaled
in seconds.
4)0
Coordinate the Over-excitation voltage setpoint and time delay
settings with the OEL function settings to protect the exciter from
overheating while avoiding nuisance tripping from normal field
forcing during transient conditions.