Rockwell Automation 1407-CGCM Combination Generator Control Module - Manual (Page 83)

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 83
CGCM Unit Configuration Chapter 4
• Volts per Hertz Lower Slope - Establishes the rate at which the V/Hz
characteristic reduces the generator voltage as a function of generator
frequency below the Lower Knee Frequency setting. Tag
VperHz_LoSlope
in the configuration table stores this value, expressed as
a number that reflects per unit change in voltage for each per unit change
in frequency.
• The Validate and graph button becomes active when a parameter has been
changed. When clicked, the V/Hz curve established by the knee and slope
values is plotted in the Volts/Hz tab.
Related Parameters:
• GenRated_V
• GenRatedFreq
OEL Tab
The OEL tab is used to configure the unit’s settings related to operation of the
Over-excitation Limiting (OEL) function. The values entered in this tab
establish the thresholds and time delays that determine the behavior of the
over-excitation limiting function. See the generator manufacturer’s data sheets for
information such as, exciter full-load and forcing current for setting both online
and offline conditions.
Refer to Chapter 3 for more information on the operation of the OEL function.