Siemens NXAIR - Racking the Withdrawable Circuit-Breaker; Circuit-Breaker Truck to Test Position Manually

Panels with motor operating mechanism control
398 NXAIR / ≤ 40 kA 110-0134.9 / 14
Preconditions
• Withdrawable circuit-breaker / circuit-breaker truck 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 / circuit-breaker truck electrically to service position
either locally or from the central control.
✓
The withdrawable circuit-breaker / circuit-breaker truck has been electrically racked from test
position to service position.
27.9 Racking the withdrawable circuit-breaker / circuit-breaker truck to test position manually
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 / circuit-breaker truck 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 / circuit-breaker truck 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.