ABB
48
Uniswitch Operation and
Maintenance Manual
UNIS14GB 05-02
5.6 Testing withdrawable parts
General When functional tests are carried out on withdrawable parts, compliance
with the conditions listed below should also be checked.
5.6.1 Testing interlock conditions
Figure 5.5
Withdrawable part standing on service truck and secured by the catches
Checkpoints 1) The withdrawable part must only be movable from the
test/disconnected position to the service position when the circuit-
breaker is open and the earthing switch is open.
Check the following conditions individually:
• With the circuit-breaker closed, insertion of the withdrawable part
towards the service position must be locked after only half a turn of
the crank in the clockwise direction.
• With the earthing switch closed, insertion of the withdrawable part
towards the service position must be locked after only two clockwise
turns of the crank.
! Use no force!
! The withdrawable part must not be stopped in any
intermediate position in the travel range between the
service and test/disconnected position!
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