Rockwell Automation 1407-CGCM Combination Generator Control Module - Manual (Page 159)

Rockwell Automation Publication 1407-UM001G-EN-P - April 2013 159
Troubleshooting Chapter 7
Units do not share load equally: units
both change together
Series 2 CGCM unit on network is
powered down and load share lines
connected
Verify CGCM unit is firmware
revision earlier than 3.3
Replace with Series 3.x CGCM unit
when available
Add relay to disconnect load share
lines on power down
Load share full scale voltage
configurations do not match
Check full load voltage
configuration in each load share
device
Set full load voltage same in all load
share devices
Governor error Check governor for use of LS
error from CGCM unit
Correct governor
Table 28 - Real Power Load Sharing
Symptom Most Likely Cause Diagnostic Action Corrective Action
Table 29 - Synchronizing
Symptom Most Likely Cause Diagnostic Action Corrective Action
No close indication from CGCM unit Phase not matched Observe Phase match tag during
synchronization
If phase match indicated, check
close command tag. If no phase
match indicated, check phase match
error
Observe phase error reported by
CGCM unit during synchronization
If no phase error is reported by
CGCM unit, correct wiring and verify
appropriate Synchronization mode is
active
If phase error reported, verify
governor is responding to CGCM
unit reported error
Close output from CGCM unit not
being examined
Monitor Close breaker tag from
CGCM unit
If close indication received, check
use of tag. If no close indication,
check match errors
Frequency not matched Observe frequency match tag during
synchronization
If frequency match indicated, check
close command tag. If no frequency
match indicated, check frequency
match error
Observe frequency error, generator
frequency, and selected bus
frequency reported by CGCM unit
during synchronization
If no frequency error is reported by
CGCM unit, correct wiring and verify
appropriate Synchronization mode is
active
If frequency error reported, verify
governor is responding to CGCM
unit reported error
Sync parameter configuration
incorrect
Observe configured synchronization
limits, VT input configuration, and
generator rated entries
Correct any errors in the
configuration entries