Allen-Bradley 1407-CGCM, User Manual, Page: 66 / 252

Rockwell Automation Publication 1407-UM001H-EN-P - November 2014
#HAPTER CGCM Unit Operation
&IGURE0OWER3YSTEM3IGN#ONVENTIONS
2EDUNDANCY
The CGCM unit is capable of being used in a Redundant mode that provides
automatic transfer of control to a second CGCM unit. In a redundant
configuration, the host Logix programmable controller is primarily responsible
for sensing power system conditions that require a transfer of control. The
CGCM unit also can initiate a transfer of control in case of certain CGCM unit
failures.
The CGCM unit is equipped with two hardware provisions designed to support
redundancy, the redundancy communication port and the redundancy relay
output.
2EDUNDANCY#OMMUNICATION0ORT
The redundancy ports of the partner CGCM units are connected together by
means of a null modem cable. The redundancy communication channel is used to
exchange tracking information from the primary to the secondary CGCM unit
to support a bumpless transfer. In addition, the secondary CGCM unit can sense
a failure in the primary CGCM unit via this communication channel to facilitate
an automatic transfer of control.
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&ORWARD2EACTIVE0OWER&LOW
EXPORT
WATTSNEGATIVE
VARSPOSITIVE
POWERFACTORLAGGING WATTSPOSITIVE
VARSPOSITIVE
POWERFACTORLAGGING
WATTSNEGATIVE
VARSNEGATIVE
POWERFACTORLEADING WATTSPOSITIVE
VARSNEGATIVE
POWERFACTORLEADING
2EVERSE2EACTIVE0OWER&LOW
IMPORT
2EVERSE2EAL0OWER&LOW
IMPORT
&ORWARD2EAL0OWER&LOW
EXPORT