Rockwell Automation 1407-CGCM Combination Generator Control Module - Manual (Page 212)

212 Rockwell Automation Publication 1407-UM001G-EN-P - April 2013
Appendix E Detailed CGCM Unit Tag Descriptions
VAR Mode This section describes the VAR mode inputs and outputs for the CGCM unit.
Inputs to the CGCM Unit
The VAR mode has these inputs.
• PF_VAR_Select – This tag lets you select PF or VAR control.
• PF_VAR_En - When this tag is set to 1, the CGCM unit uses the
PF_VAR_Select tag to determine its control mode. When this tag is set to
0, the CGCM unit uses the AVR_FCR_Select tag to determine its control
mode.
• VARSetpt - This tag sets the desired kVAR setpoint for operation in the
VAR control mode.
• VAR_Kg - This tag lets you adjust coarse loop gain and overall gain of the
power factor controller. It also determines the characteristic of the
dynamic response to a change in the power factor of the generator.
• VAR_Ki - This tag lets you adjust the integral gain of the VAR controller.
It also determines the characteristic of the dynamic response to a change in
the VAR setting.
• VAR_Traverse_Rate - This parameter determines the time measured in
seconds for the setpoint to move from zero to the rated generator KVA. It
determines how fast the regulator changes the VAR setpoint from the
tracking value to the operating setpoint when the Regulator Operating
mode changes to VAR.
• PF_VARAuxGain - This tag lets you adjust the overall gain of the
auxiliary input’s control on the VAR/PF operating modes. The units for
the var controller are percent of nominal per volt. A setting of one results
in the controlled parameter being changed by one percent of the nominal
value for each volt applied to the auxiliary input. For PF control, the units
are 0.01PF per volt. A setting of 5 results in the regulated PF being
changed by 0.05 for each volt applied to the auxiliary input.
Outputs from the CGCM Unit
The VAR mode has these outputs:
• PF_VAR_Selection - This tag reports the selection of PF or VAR control
(see PF_VAR_Select).
• PF_VAR_Control – This tag reports your selection of PF/VAR or
AVR/FCR mode.