Eaton W-VACi - Troubleshooting Chart

65A7355H01 November 2011 www.eaton.com
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4.8 Troubleshooting Chart
Symptom
Inspection area
Probable cause
Fail to Close
Closing-spring
not charged
Motor Circuit
● No control power
（fuse blown or switch off）
● Secondary disconnect is not connected
● Motor cut-off switch or its push lever is damaged
● Loose wire terminal connections
● Motor failure
Closing-spring
charged but breaker
does not close
Shunt Closing Release circuit,
when the plunger of the shunt
does not pick up
● No control power, or its out of voltage range
（fuse blown or switch off, or wrong voltage applied)
● Secondary disconnects is not in service
● Anti-pumping device is in service
● Shunt closing release failure
● The breaker is between service and test position
when it is in the switchgear
Mechanical Interlock, may
override the plunger of the shunt
close release may pick up
● The breaker is between service and test position
when it is in the switchgear
Closing spring is released, but
the breaker fails to close.
● Trip circuit is energized (trip free)
● Trip latch does not reset
Breaker does not
close when manually
pushing the close
button
Electromechanical Interlock
 Secondary Disconnect is not pluged in or has no
control power to it
Breaker does not
rack in
Electromechanical Interlock
 Check to see if proper secondary control voltage
is applied to the interlock