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Trouble shooting
Earthing switch
Fault
Actuating opening for feeder
earthing switch cannot be opened.
Actuating opening for busbar
earthing switch cannot be
opened.
Operating lever cannot be inserted.
Circuit-breaker
Fault
Circuit-breaker cannot be closed.
Spring energy store is not charged
automatically.
If these Operating Instructions should not clarify all questions regarding operation and maintenance of the
NXAIR M switchgear, please contact the Siemens sales partner or the regional Siemens representative.
250
Cause
Racking crank for moving the
withdrawable part is inserted.
General panel interlock active.
Operating slide for opening the
actuating opening is locked.
General panel interlock active.
Operating slide for opening the
actuating opening is locked.
Operating slide for opening the
actuating opening is interlocked
by the electromagnetic interlock.
Withdrawable part in service
position.
Cause
Racking crank for moving the
withdrawable part is inserted.
Withdrawable part is in
intermediate position.
Spring energy store not charged.
Undervoltage release is not
energized.
No auxiliary voltage.
NXAIR M
Remedy
Remove the racking crank
for moving the withdrawable
part.
Observe general panel
interlock.
Open the padlock.
Observe general panel
interlock.
Open the padlock.
Request external release.
Rack the withdrawable part to
test position; switch the
circuit-breaker to OPEN
position, if required.
Remedy
Remove the racking crank for
moving the withdrawable part.
Rack the withdrawable part to
service position or test position.
Wait for 15 s (motor) or charge
manually.
Activate the undervoltage
release.
Apply auxiliary voltage or
charge the spring manually.
139-2021.9 / 07
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