Siemens NXAIR - Page 428

Trouble shooting
428 NXAIR / ≤ 40 kA 110-0134.9 / 14
Earthing switch
Fault
Cause
Remedy
Actuating opening for feeder
earthing switch cannot be opened.
Racking crank for moving the
withdrawable part is inserted.
Remove the racking crank
for moving the withdrawable
part.
General panel interlock active.
Observe general panel
interlock.
Operating slide for opening the
actuating opening is locked.
Open the padlock.
Actuating opening for busbar
earthing switch cannot be
opened.
General panel interlock active.
Observe general panel
interlock.
Operating slide for opening the
actuating opening is locked.
Open the padlock.
Operating slide for opening the
actuating opening is interlocked
by the electromagnetic interlock.
Request external release.
Operating lever cannot be inserted.
Withdrawable part in service
position.
Rack the withdrawable part to
test position; switch the
circuit-breaker to OPEN
position, if required.
Circuit-breaker
Fault
Cause
Remedy
Circuit-breaker cannot be closed.
Racking crank for moving the
withdrawable part is inserted.
Remove the racking crank for
moving the withdrawable part.
Withdrawable part is in
intermediate position.
Rack the withdrawable part to
service position or test position.
Spring energy store not charged.
Wait for 15 s (motor) or charge
manually.
Undervoltage release not
energized.
Activate the undervoltage
release.
Spring energy store is not charged
automatically.
No auxiliary voltage.
Apply auxiliary voltage or
charge the spring manually.
If these Operating Instructions should not clarify all questions regarding operation and maintenance of the
NXAIR switchgear, please contact the Siemens sales partner or the regional Siemens representative.