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Chapter 3
CGCM-DLR Unit Operation
42
Analog Inputs
The CGCM-DLR unit provides a number of analog inputs for use in the
regulation and control of standalone and paralleled generator systems. The
following sections outline each of the inputs.
Generator Voltage Sensing Inputs
The CGCM-DLR unit senses generator voltage through voltage transformers
(VTs) installed across the generator output leads.
The CGCM-DLR unit uses voltages that are measured through the generator
voltage sensing inputs for generator voltage, VAR and/or power factor
regulation, kW and kVAR load sharing, synchronization, metering, and
protection. The inputs accept signals with up to 40% Total Harmonic Distortion
(THD) and are connected for single-phase and 3-phase applications. The
generator voltage inputs are internally scaled by the CGCM-DLR unit according
to its transformer configuration settings.
Generator voltage sensing inputs are labeled V Gen A, V Gen B, V Gen C, and V
Gen N.
Bus Voltage Sensing Inputs
Voltages that are measured through the bus voltage sensing inputs are used for
generator to bus synchronizing. The CGCM-DLR unit senses bus voltage
through VTs. Depending upon the number of busses and the type of
synchronizing required, there are one or two sets of bus sensing transformers. If
dual bus synchronizing is required, the sensing transformer configuration is
limited to single-phase. In a single breaker system, the inputs are connected in
either single-phase or 3-phase configurations. The inputs accept signals with up
to 40% THD. The bus voltage inputs are internally scaled by the CGCM-DLR
unit according to its transformer configuration settings.
Bus voltage sensing inputs are labeled V Bus A, V Bus B, V Bus C, and V Bus N.
Generator Line Current
The CGCM-DLR unit senses generator current through current transformers
that are installed on the generator output leads.
Current measured through the line current inputs is used for metering purposes,
regulating generator VARs, regulating generator PF, real power load sharing, and
for protection purposes. The current measured is required for operation in AVR
Droop, PF, and VAR operating modes. Line current inputs are galvanically
isolated via CTs internal to the CGCM-DLR unit. The CGCM-DLR unit
accepts either 1 A or 5 A current inputs that are wired to the corresponding
input. Line current inputs are labeled I1(+)1 A, I1(+)5 A, I1(-), and so forth.
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
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