Rockwell Automation 1407-CGCM Combination Generator Control Module - Manual (Page 69)

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 69
CGCM Unit Operation Chapter 3
The redundant tracking delay setting adjusts the delay of the tracking function to
prevent the secondary CGCM unit output from being adjusted into an
undesirable condition. For example, with AVR mode active in the primary
CGCM unit, if the generator sensing VT fails open the excitation output goes to
a full-on state. Applying a tracking delay reduces the likelihood of this undesirable
operating point to be transferred to the secondary CGCM unit when it takes
over control.
Watchdog Timer
A watchdog timer time-out is an indication that the CGCM unit is not capable
of executing the proper instructions, including those required to energize the
fault output. When the Watchdog Timer times out, the CGCM unit removes
excitation from the system, the CGCM unit internal microprocessor is reset, and
the output relays (fault and redundancy) are disabled.