Operating Conditions Without Auxiliary Voltage - Siemens NXAIR Operating Instructions Manual

Operating the contactor panel with panel width 600 mm

14.12 Operating conditions without auxiliary voltage

Contactor panels with electromagnetic interlock for racking the contactor truck (optional) plus mechanical
closing latch for the contactor (optional) are equipped with an additional feature.
In case the auxiliary voltage is disconnected, the electromagnetic interlock can be unlocked manually. This
manual unlocking is operated on the high-voltage door with a lever. This lever is padlocked during standard
operating conditions.
Fig. 287: Manual unlocking,
padlocked
Racking the contactor truck to test position
164
NOTICE
Maloperation
Without auxiliary voltage, turning the double-bit key is mechanically interlocked.
Do not try to turn the double-bit key while the mechanical interlock is
active.
Perform manual unlocking of the electromagnetic interlock to release
turning of the double-bit key.
In addition to these instructions, instruction labels on the high-voltage
door inform about the operation of the manual unlocking:
Fig. 288: Instruction labels on high-voltage door
INFORMATION
Unexpected switching noise and vibration
If the contactor is in CLOSED position before starting the procedure, turning the
double-bit key 90° opens the contactor. This causes a short loud noise and low
vibration.
Expect switching noise and low vibration from inside the contactor when
turning the double-bit key.
NXAIR / ≤ 40 kA
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