Racking The Withdrawable Circuit-Breaker To Test Position Manually - Siemens NXAIR M Operating Instructions Manual

Preconditions

Withdrawable circuit-breaker in test position

Low-voltage connector plugged on

High-voltage door closed

Feeder earthing switch in OPEN position

Circuit-breaker in OPEN position

Remote or local control

Control door closed and padlocked

Access mode indicator for racking shows "M"
Procedure
Rack the withdrawable circuit-breaker electrically to service position either locally or from the
central control.

The withdrawable circuit-breaker has been electrically racked from test position to service
position.

23.9 Racking the withdrawable circuit-breaker to test position manually

139-2021.9 / 07
Panels with motor operating mechanism control
NOTICE
Conflicting operation
The requirement of setting the panel to either local or remote control prevents
operating the panel locally and centrally at the same time.
For any local operations ─ manual or electrical ─ set the panel to local
control, for example by switching the local-remote switch to LOCAL
position.
NOTICE
Maloperation
Racking the withdrawable circuit-breaker is only permissible if the circuit-breaker
is in OPEN position.
Check if the circuit-breaker is in OPEN position.
If required, switch the circuit-breaker to OPEN position before racking.
NOTICE
Incorrect stress of the motor operating mechanism
When the withdrawable circuit-breaker is racked manually, the motor operating
mechanism is also turned via the wheel chain mechanism.
Turn the racking crank slowly and uniformly to avoid high reverse polarity
voltage.
NXAIR M 221