Excitation control features, Soft start inputs to the cgcm unit, Under-frequency limit inputs to the cgcm unit – Rockwell Automation 1407-CGCM Combination Generator Control Module User Manual
Page 213: Cross-current compensation inputs to the cgcm unit
Rockwell Automation Publication 1407-UM001G-EN-P - April 2013
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Detailed CGCM Unit Tag Descriptions Appendix E
Excitation Control Features
This section describes the excitation control features.
Soft Start Inputs to the CGCM Unit
• SoftStart_InitLevel - This tag configures the generator voltage that is
generated immediately after enabling the CGCM unit. This parameter is
based on a percentage of the nominal generator voltage.
• SoftStartTime - This tag configures the time it takes to go from the Soft
Start Initial Voltage to the nominal generator voltage.
Droop (Reactive Current Compensation) Inputs to the CGCM Unit
• Droop_CCC_Select – If Droop is enabled, this tag selects CCC when set
to 1 or Droop when set to 0.
• V_DroopEn – This tag configures whether Droop is enabled
• V_DroopSetpt - This tag configures the amount of voltage droop that is
experienced during paralleling generator applications.
Under-frequency Limit Inputs to the CGCM Unit
• VperHz_HiKneeFreq - The Knee Frequency tag configures the frequency
at which the V/Hz characteristic starts to reduce the generator voltage as a
function of generator frequency.
• VperHz_HiSlope - The Upper Slope tag configures the rate at which the
V/Hz characteristic reduces the generator voltage as a function of
generator frequency. The steeper the slope the faster the prime mover is
unloaded and smaller the frequency variations are experienced during load
applications.
• VperHz_LoKneeFreq - The Knee Frequency tag configures the frequency
at which the V/Hz characteristic starts to reduce the generator voltage as a
function of generator frequency.
• VperHz_LoSlope - The Lower Slope tag configures the rate at which the
V/Hz characteristic reduces the generator voltage as a function of
generator frequency after the Lower Knee Frequency is exceeded.
Cross-current Compensation Inputs to the CGCM Unit
• Droop_CCC_Select – If Droop is enabled, this bit selects CCC when set
to 1 or Droop when set to 0.
• CrossCurrentGain - This setting lets you adjust the gain of the cross
current input. The actual value measured by the cross current input is
multiplied by this setting. It can be used to improve the var sharing
between machines connected in cross current.