Operating The Circuit-Breaker; Closing The Circuit-Breaker; Opening The Circuit-Breaker; Charging The Closing Spring - Siemens NXPLUS C Installation And Operating Instructions Manual

Operation
Control voltage failure

Closing the circuit-breaker

Control voltage failure
Locking device
Opening the circuit-
breaker
Closing spring
Control voltage failure
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20

Operating the circuit-breaker

20.1 Closing the circuit-breaker
If there is no block active from the mechanical interlock, the circuit-breaker can be closed
electrically (if provided) or mechanically.
If the control voltage fails, the circuit-breaker must be closed mechanically (pushbutton).
➭ Operate the ON pushbutton in the mechanical or electrical control board.
✔ The circuit-breaker is closed.
20.2

Opening the circuit-breaker

The circuit-breaker can be opened electrically (if provided) or mechanically.
If the control voltage fails, the circuit-breaker must be opened manually.
If the feeder is earthed through the three-position disconnector and the circuit-breaker, and if
the "feeder locking device" is fitted, all electrical opening commands are ineffective.
If the locking device is padlocked, the circuit-breaker cannot be opened mechanically either.
➭ Operate the OFF pushbutton in the mechanical or electrical control board.
✔ The circuit-breaker is open.
20.3

Charging the closing spring

The closing spring is charged automatically after applying control voltage. The energy
required for the operating sequence OPEN-CLOSE-OPEN (auto-reclosing) is stored in the
closing spring about 15 seconds after closing the circuit-breaker operating mechanism.
If the control voltage fails, the closing spring can be charged with a hand crank. The hand
crank is equipped with a freewheel. If the control voltage returns while the hand crank is
inserted, the freewheel prevents injuries caused by the starting motor.
High speed moving parts
Using an incorrect hand crank can cause injury.
➭ Use exclusively the hand crank provided with the switchgear accessories.
The hand crank supplied features a freewheel function. The freewheel function
disconnects an inserted hand crank from the charging system when the motor charges the
closing spring.
➭ Remove cover from cutout.
➭ Insert hand crank.
➭ Turn hand crank clockwise approx. 30 turns.
✔ The indication "closing spring charged" appears in the inspection window.
➭ Remove hand crank.
➭ Close cutout with cover.
Revision 11 • INSTALLATION AND OPERATING INSTRUCTIONS • NXPLUS C • 802-9081.9
CAUTION