ABB OVB-SDB, Instructions Manual

Page: 29 / 64

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The spring charging motor charges the springs after each closing operation until the spring-
charged indication appears. Should there be no voltage during charging, the geared motor
stops, and starts recharging the springs automatically when the voltage is on again. It is,
however, always possible to complete the charging operation manually. Motor supply gets
cut-off automatically as the spring gets completely charged.
1.3.2 Manual Spring Charging
For charging the Closing-springs manually, fully insert the charging handle into the seat and
rotate it clockwise until you see the spring-charged indication.
Ensure the handle is engaged with the seat.
The force, which can normally be applied to the charging handle, is 130 N. In any case, the
maximum force applied must not exceed 170 N. As the springs get charged, a sound
[internal latches getting engaged] can be heard.
The arm won’t rotate the charging-gear further, since the charging-gear has no teeth on
remaining periphery.
1.4.1 Closing Operation:
Consider both the springs are in discharged condition and breaker is open (Ref Fig. H)
In this condition neither close nor open operation is possible to perform on the breaker.
Latch assembly (La) and (Lb) are in released condition. The closing spring can be charged
either electrically or manually as explained in section1.3. During the process of charging
pin (P1) comes in contact with closing lever (Ref Fig F, Page 29). Pin (P1) will creates
pressure on closing lever as closing spring is fully charged. Position of the closing lever in
this condition is retained by half shaft.
1.4 Breaker Operations