Allen-Bradley 1407-CGCM, User Manual, Page: 40 / 252

Rockwell Automation Publication 1407-UM001H-EN-P - November 2014
#HAPTER CGCM Unit Operation
!UXILIARY)NPUT
This input is an analog voltage (-10…10V DC), and provides a means to remotely
adjust the regulation point of the generator. Resistive isolation is provided
through the use of differential amplifiers.
The auxiliary input terminals are labeled VREF(+) and VREF(-).
0OWER)NPUTS
The unit has two types of power inputs: control power inputs and excitation
power inputs.
#ONTROL0OWER)NPUT
The CGCM unit operates from a nominal 24V DC supply connected to the
control power inputs. The control power input is diode-protected to protect
against equipment damage due to improper polarity of the applied power.
The control power inputs are labeled BAT(+) and BAT(-).
%XCITATION0OWER)NPUT
The CGCM unit accepts either 3-phase or single phase excitation power.
Excitation power can be obtained from the generator or the utility via shunt
excitation (SE) or from the generator prime mover via a Permanent Magnet
Generator (PMG).
See Chapter 2 for details on connections for SE or PMG operation.
The excitation power input terminals are labeled PMG A, PMG B, and PMG C.
$ISCRETE)NPUTS2EMOTE%XCITATION%NABLE
The remote excitation enable input is a 24V DC input. When 24V DC is applied
to the input, CGCM unit excitation is permitted.
The remote excitation enable input terminals are labeled EX-D(+) and EX-D(-).
)-0/24!.4
For generator excitation to occur, excitation must be enabled in software,
an active ControlNet connection must be present, and a 24V DC signal
must be applied to the remote excitation enable input.