Instruction Book
Effective: November 2017 Page 56
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IB131016EN
Table 6.4 Troubleshooting Guide (continued on next page)
Symptom
Probable Cause
Corrective Actions
Circuit breaker undesirably opens
Undervoltage release operates;
voltage too low or zero.
Check and correct the UVR supply
voltage (85-110% rated voltage)
Shunt Trip operates
Check control signal(s) to shunt trip;
correct if necessary
Trip latch is defective
Inspect latch condition and
engagement before closing; consult
Eaton service center
Circuit breaker cannot be opened
remotely, but can be opened locally
Shunt trip control signal absent or
too low
Check supply voltage exceeds
minimum of voltage range when
signal is applied to shunt trip
Shunt trip is faulty or improperly
installed.
Remove front cover; check voltage
supplied to shunt trip; make sure
shunt trip is seated and retainer
snapped into place. Check for
shunt trip motion; replace shunt trip
if faulty
Secondary contact wiring problem
Make sure electrical pin and socket
connectors are properly seated in
molded plug. Verify proper wiring
Circuit breaker cannot be opened locally
OPEN pushbutton locked
Remove lock
Faulty mechanism or one or more
vacuum interrupter contacts welded
Contact Eaton service center
Circuit breaker makes no attempt to close
with either local (manual) or remote
controls; springs do not discharge
Closing spring not fully charged
(check SPRING CHARGED
indicator)
Charge spring manually; check
voltage to electrical operator;
replace electrical operator if faulty
If equipped with undervoltage
release, undervoltage release is not
energized or is faulty
Unplug undervoltage release from
mounting deck and retry closing
operation; if OK, check voltage
supply to undervoltage release
(>85%); replace undervoltage
release if faulty
Circuit breaker locked in OPEN
position
Check reason for lock
Circuit breaker interlocked with
another circuit breaker or device
Check for presence of an
interlocking scheme (cable interlock
or key interlock); check to see if
interlocked circuit breaker is
CLOSED
Summary of Contents for 50 VCP-TR16
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