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Chapter 3
CGCM-DLR Unit Operation
66
• Single-phase
The CGCM-DLR unit can synchronize where only one line-to-line input
is available from the generator or bus. This scheme is the case for
single-phase systems or in systems where only one phase has a transformer
that is connected for synchronization purposes. The CGCM-DLR unit
can perform no phase rotation check on the generator output with
single-phase generator voltage sensing. The reference bus connection can
be either single or 3-phase.
To enable single-phase synchronizing, select the Generator VT
Configuration as Single-phase.
Configurable Synchronization Parameters
The CGCM-DLR unit provides a number of configurable settings to facilitate
synchronizing between systems with different voltages and metering
configurations.
See
Chapter 4
for more information.
Initiating Synchronization
Before the unit performs synchronization, the host controller must initialize tags
in the Output table to their appropriate values as described in the following
section:
• Automatic Synchronization
The host controller sets the AutoSyncEn tag to enable the synchronizer to
compute error and correction tags in the software interface for control of
the synchronization bus voltage, frequency, and phase. When the
synchronizing conditions are met, the CGCM-DLR unit sets the proper
close breaker tag.
– Dual bus: The CGCM-DLR unit uses the generator bus inputs and the
active bus inputs to for synchronization.
– Dead bus: If dead bus closure is enabled, the CGCM-DLR unit sets the
close breaker tag when the generator frequency and voltage are within
the configured dead bus limits.
Before Host FRN 4.9, regardless of the setting of the
IMPORTANT
DeadbusGenFreqLoLimit parameter, the CGCM-DLR unit disables
synchronization when the generator frequency is below 45 Hz.
When the CGCM-DLR unit senses that all three (one for single phase
setup) bus voltages are less than 10% of the configured voltage and
frequency is less than 20 Hz, it sets the Dead Bus Synchronizing mode
tag. The CGCM-DLR unit does not calculate voltage or frequency
error signals during Dead Bus mode.
Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
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