ABB
49
Uniswitc h Operation a nd
Mainte na nc e Manua l
UNI S14GB 05-02
2) The withdrawable part must only be movable from the
test/disconnected position to the service position when the control-
wiring plug is inserted.
Check the following conditions individually:
•
With the control wiring plug disconnected, insertion of the
withdrawable part towards the service position must be locked after
only half a turn of the crank in the clockwise direction.
3) The withdrawable part must only be movable from the service
position to the test/disconnected position with the circuit-breaker
open.
Check this condition as follows:
•
With the circuit-breaker closed, withdrawal movement of the
withdrawable part must be locked after only half a turn of the crank in
anti-clockwise direction.
4) Closing of the circuit-breaker must only be possible when the
withdrawable part is in the defined test/disconnected position or
service position.
The control-wiring plug must previously have been inserted.
Check this condition as follows:
•
It must not be possible to close the circuit-breaker with the
withdrawable part in any position between the test/disconnected
position and the service position.
Enabling of switching when the withdrawable part moves to the service
position is carried out electrically by operation of auxiliary switch S9 in
the withdrawable assembly, and slightly earlier mechanically - this
corresponds to a position approximately half a turn of the crank before
the stop.
•
For movement to the test/disconnected position, the same enabling
conditions apply in the same way, in this case by means of auxiliary
switch S8 in the withdrawable assembly.
5) It must only be possible to open the circuit-breaker (manually) when
the withdrawable part is in the service position or test/disconnected
position and the control voltage has failed.
