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
Generator Protection Functions
This list contains the generator protection functions:
• Loss of excitation current (40)
• Over-excitation voltage (59F)
• Generator over-voltage (59)
• Generator under-voltage (27)
• Loss of sensing (60FL)
• Loss of permanent magnet generator
(PMG/Excitation power) (27)
• Reverse VAR (40Q)
• Over-frequency (81O)
• Under-frequency (81U)
• Reverse power (32R)
• Rotating diode monitor
• Phase rotation error (47)
• Generator over-current (51)
Metering Functions
This list contains the metering functions:
• Voltage
• Current
• Frequency
• Real Power
• Apparent Power
• Reactive Power
• Power Factor
• Real Energy (kWh)
• Apparent Energy (kVAh)
• Reactive Energy (kVARh)
• Controller Excitation Current and Voltage
• Diode Monitor Ripple Level
• Load Share Error
• Synchronization Parameters
Inputs
This list contains the inputs for the CGCM unit:
• Single-phase or three-phase true rms generator voltage sensing
• Single-phase dual bus or three-phase single bus voltage sensing
• Three-phase generator current sensing (1 or 5 A nominal)
• Single-phase cross current loop 1 or 5 A current transformer (CT) input
• Auxiliary ±10V DC input providing remote control of the setpoints
• DC power input
Outputs
This list contains the outputs for the CGCM unit:
• Pulse-width modulated output power stage rated at 15 A
• Discrete redundancy relay output
• Discrete fault output driver
• Load sharing connection for use with the Allen-Bradley Line
Synchronization Module (1402-LSM) or compatible hardware
Communication Interfaces
The CGCM unit has these three communication ports:
• Redundant ControlNet connector
• RS-232 port for dedicated communication with a redundant CGCM
• RS-232 port for factory configuration and test (not for customer use)
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thanks for your post ... have been reading the manual (CGCM) and also thinking about how the connection is going to be along side with a suitable circuit breaker to use...
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