First Closing Operation - Siemens 3AH3 Operating Instructions Manual

Operation
Hand crank
Fig. 70 Charging the closing spring with the hand
crank
50
WARNING
Do not commission the vacuum circuit-breaker if there are malfunctions.
If the malfunctions or the damage cannot be remedied, contact a sales represent-
ative or Siemens Service and, if necessary, send back the vacuum circuit-
breaker.

First closing operation

If all functions have been checked and are ok, switch on high-voltage while observ-
ing all of the safety regulations and operative requirements.
Charging the closing spring
WARNING
Risk of injury if hand cranks other than the original hand crank are used.
When the supply voltage is present, the motor immediately recharges the spring
after a closing operation. If the hand crank does not have a slip coupling, the hand
crank will also rotate.
To avoid injuries caused by the motor starting suddenly, the vacuum circuit-
breaker must be charged only using the original hand crank.
If the supply voltage is applied, the closing spring (62.) is automatically charged by
the motor (50.4).
If the supply voltage fails, the closing spring (62.) can be charged with a hand crank
(50.).
1. For this, fit the hand crank (50.) onto the hand crank coupling (50.5) through the
opening (50.1) with the adapter pushed forward (50.6).
2. Turn clockwise until the spring state indicator (55.) changes over:
Discharged

Charged
Fig. 71 Operating elements and spring state indicator
9229 9860 176 0E
2013-08-22