Circuit-Breaker Closing And Opening Operations - ABB VD4 36 Installation And Service Instructions Manual

6.3.

Circuit-breaker closing and opening operations

Circuit-breaker operation can be either manual or electrical
(fig. 6 - fig. 7).
a) Manual closing spring charging for VD4 circuit-
breakers for UniGear switchgear and PowerCube
modules (fig. 7)
Repeatedly activate the charging lever (2) (maximum rotation
angle of the lever: about 90°) until the yellow indicator (7)
appears.
The maximum force which can normally be applied to the
lever ≤
250 N for EL3 operating mechanism.
Fig. 7
15
b) Electrical spring charging operation
On request, the circuit-breaker can be fitted with the following
accessories for electrical operation:
– geared motor for automatic closing spring charging
– shunt closing release
– shunt opening release.
The geared motor automatically recharges the spring after
each closing operation until the yellow indicator (7) appears.
If the power is cut off during charging, the geared motor stops
and automatically starts recharging the springs again when
the power returns.
In any case, it is always possible to complete the charging
operation manually.
c) Circuit-breaker closing
The operation can only be carried out with the closing spring
completely charged.
For manual closing, press the pushbutton (5 - fig. 6).
When there is a shunt closing release, the operation can also
be carried out remotely by means of a special control circuit.
Closing having taken place is indicated by the signalling
device (6 - fig. 6).
d) Circuit-breaker opening
For manual opening, press the pushbutton (4 - fig. 6).
When there is a shunt opening release, the operation can also
be carried out remotely by means of a special control circuit.
Opening having taken place is indicated by the signalling
device (6 - fig. 6b).
˜ 90°
7
2