Manual

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 9

Chapter

General Information

Introduction

The Combination Generator Control Module (CGCM unit) is a

microprocessor-based control and protection device. The CGCM unit is

designed to integrate with a Logix family programmable controller to provide

generator control, protection and synchronization functions. Programmability of

system parameters, regulation settings, and protective functions enable the

CGCM unit to be used in a wide range of applications.

Functions

The following sections outline the functions of the unit.

Generator Regulation and Control Functions

This list contains the generator regulation and control functions:

• Four excitation control modes

• Automatic voltage regulation (AVR)

• Manual or field current regulation (FCR)

• Power factor (PF)

• Reactive power (VAR)

• Soft start voltage buildup with an adjustable ramp in AVR and FCR

control modes

• Over-excitation (OEL) and under-excitation (UEL) limiting in AVR,

VAR, and PF control modes

• Under-frequency compensation (Volts/Hertz)

• Line drop compensation

• Auto-tracking between operating modes and between redundant CGCM

units

• Automatic transfer to a back-up CGCM unit in redundant systems

• Generator paralleling with reactive droop compensation or cross-current

(reactive differential) compensation

• Generator paralleling with real power load sharing

• Synchronizing for one or two circuit breakers