Allen-Bradley 1407-CGCM, User Manual, Page: 54 / 252

Rockwell Automation Publication 1407-UM001H-EN-P - November 2014
#HAPTER CGCM Unit Operation
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0ROTECTION&UNCTIONS
The CGCM unit detects the fault conditions listed and described below. Faults
detected by the CGCM unit are communicated to the host Logix programmable
controller. Fault flags are communicated in the Scheduled Read table. A fault flag
is latched until the host controller resets it. The host Logix controller can reset all
CGCM unit faults by setting the tag FltReset = 1 once the fault condition is
cleared.
The CGCM unit automatically shuts down excitation if one of these faults
occurs:
•
Overexcitation voltage
•
Reverse VAR
•
Logix controller fault
Fault conditions can also be configured to activate the CGCM unit fault relay
output. Once configured, the CGCM unit fault relay operates independently of
the host Logix controller program (including Controller Run/Program mode).
Refer to Chapter 4 for information on configuring the fault relay operation.
#'#-0ROTECTION#APABILITIES
The protective functions in the CGCM unit are time-proven and designed to
provide a high degree of reliability, repeatability, longevity, and accuracy. The
CGCM unit is designed to meet or exceed applicable CE standards, but was not
tested to all standards that many North American utilities use to define utility
grade protection. However, the CGCM unit does possess many of the features
that define utility grade protection.
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