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Rockwell Automation Publication 1407-UM002B-EN-P - February 2019
Chapter 2
Installation
Chassis
Ground
The terminal that is labeled CH GND, on TB4, is the chassis ground. Ground
studs are also provided on the lower part of the mounting flanges and are
internally connected to the CH GND terminal. Connect chassis ground to earth
ground with minimum 2.6 mm
2
(10 AWG) copper wire that is attached to either
stud on the lower part of either side of the unit. Also connect to the CH GND
terminal with 1.6 mm
2
(14 AWG) copper wire. When installed in a system with
other CGCM-DLR units, use a separate lead to the ground bus from each unit.
AC Voltage and Current Sensing
The CGCM-DLR unit supports generator and bus voltage sensing and generator
current sensing.
Generator and Bus Voltage Sensing
CGCM-DLR units accept single-phase or 3-phase generator and bus voltage
sensing input with nominal voltages of 120V or 208V AC.
See
Terminal Block Label Description
on
for possible wiring
configurations.
The terminals that are found on TB5 provide connections for generator voltage
sensing and are labeled V GEN A, V GEN B, V GEN C, and V GEN N. The
terminals that are found on TB6 provide connections for bus voltage sensing and
are labeled V BUS A, V BUS B, V BUS C, and V BUS N. The connection
examples show typical connections for various generator and bus connection
schemes.
The CGCM-DLR unit supports these generator connection schemes:
•
Single-phase
•
Delta or Two-transformer Open Delta
•
Three-wire Wye
•
Four-wire Wye
The CGCM-DLR supports these bus connection schemes:
•
Single-phase
•
Delta or Two-transformer Open Delta
•
Three-wire Wye
•
Four-wire Wye
•
Dual Breaker, single-phase only