ABB
34
Uniswitch Operation and
Maintenance Manual
UNIS14GB 05-02
4.4.3 Circuit-breaker - type VD4
4.4.3.1 Charging the stored energy spring system
Instructions
Figure 4.17
Manual operation of
withdrawable part with VD4
circuit-breaker
On the circuit-breaker with charging motors, charging is carried out
automatically. If the charging motor should fail, the charging procedure
can be carried out manually.
On breakers with manual charging systems, open the door with the
withdrawable part in the disconnected position, insert charging lever
(80.4) into the recess and pump for approximately 25 strokes until the
charged condition is indicated (43.4). When the charged condition is
reached, the charging mechanism is automatically disengaged, and any
further strokes of the lever have no effect.
4.4.3.2 Opening and closing the VD4 type circuit-breaker
Instructions
Figure 4.18
• Opening and closing operations with the withdrawable part in the
service position should only be performed with the door closed.
• Operate the local or remote electrical control.
• Observe the switch position indicator.
The switching operation counter (43.3) (Figure 4.17) for the circuit-
breaker automatically increases by one unit with each operating cycle.
An additional control mechanism fitted in the door of the circuit-breaker
compartment enables mechanical operation of the circuit-breaker with
the door closed and with the withdrawable part in either position.
• Press the relative mechanical pushbutton (60.6 or 60.7), having
previously turned knob (60.12) anti-clockwise to the stop if the
withdrawable part is in the service position.
• Observe the switch position indicator.
Further information For further details regarding operations and maintenance of VD4 circuit-
breakers, see instruction manuals BA 352 and BA 359.
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