Allen-Bradley 1407-CGCM, User Manual, Page: 161 / 252

Rockwell Automation Publication 1407-UM001H-EN-P - November 2014
Troubleshooting #HAPTER
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
4ABLE2EAL0OWER,OAD3HARING
3YMPTOM -OST,IKELY#AUSE $IAGNOSTIC!CTION #ORRECTIVE!CTION
4ABLE3YNCHRONIZING
3YMPTOM -OST,IKELY#AUSE $IAGNOSTIC!CTION #ORRECTIVE!CTION
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