Tests On Withdrawable Parts With Vm1 Type Circuit-Breaker; Motor-Driven Withdrawable Parts; Checking The Auxiliary Switch Settings On Withdrawable Parts; Checking The Direction Of Rotation Of The - ABB VM1 Instruction Manual

7.5 Tests on withdrawable parts with VM1 type
circuit-breakers
The following conditions are to be checked to test
the function of the withdrawable part.

7.5.1 Motor-driven withdrawable parts

(non-standard)
Inspection of motor-driven withdrawable parts
should be performed as for manually operated
withdrawable parts in accordance with Section
7.5.2:
• Turn off the supply voltage (m.c.b.), since the
motor could otherwise be braked electrically.
• Turn hand crank 38 in the required direction
(see Figure 9/23).
Note:
When the withdrawable part moves, the motor
turns. The motor functions in such a case like a
generator, i.e. it can lead to reverse voltages in the
terminals.
7.5.2 Checking the auxiliary switch settings on
withdrawable parts
(Figures 9/12 and 9/23)
Compliance with the interlock conditions in the
test/disconnected and service position areas is
ensured by position signalling switches -S8 and
-S9 located in the withdrawable assembly and
factory-set.
In test operations, the withdrawable part must be
moved by hand with the crank fitted with the motor
power switched off.
1. Settings in the area of the test/disconnected
position:
• Move the withdrawable part out of the test/
disconnected position towards the service
position with a few turns of the crank.
• Slowly move the withdrawable part back to
the stop.
Auxiliary switch -S8 must then switch over
just before the stop is reached.
• Slowly insert the withdrawable part from the
test/disconnected
service position until auxiliary switch -S8 just
operates (approx. 30° rotation of the crank).
It is no longer possible to switch the circuit-
breaker on in this position.
When the hand crank is turned further, the
position of the circuit-breaker is polled by pawl
35.5 after a total angle of turn of approx. 90°. If
the circuit-breaker is closed, the withdrawable
part cannot be moved any further.
• For this test, the function of the blocking
magnet -Y0 (if fitted) must be disabled
manually.
position towards the
2. Settings in the area of the service position:
• Move the withdrawable part out of the limit
position towards
position with a few turns of the crank.
• Slowly move the withdrawable part forwards
again to the stop:
Auxiliary switch -S9 must then switch over
just before the stop is reached.
• Slowly move the withdrawable part out of
the service position towards the test/
disconnected position until auxiliary switch
-S9 just responds (approx. 30° rotation of the
crank).
When the hand crank is turned further, the
position of the circuit-breaker is polled by pawl
35.5 after a total angle of turn of approx. 90°. If
the circuit-breaker is closed, the withdrawable
part cannot be moved any further.
7.5.3 Checking the direction of rotation of the travel
motors on motor-driven withdrawable parts
• Move the withdrawable part by hand into a
central position between the test/disconnected
position and the service position.
• Remove the hand crank.
• Switch the supply voltage for the travel motor on.
• Use the local electrical controls to check that the
withdrawable part moves in the correct
direction.
Caution:
Do not allow the withdrawable part to run up
against a block when the travel direction is
incorrect! Switch the motor power off immediately
(the travel process functions electrically by a seal-in
system with limit position switch-off).
There may be a danger of injury when the door is
open!

7.5.4 Checking of interlock conditions

(Figures 9/19 and 9/23)
1. The withdrawable part must only be movable
from the test/disconnected position into the
service position when the circuit-breaker is open .
Check this condition as follows:
• With the circuit-breaker closed, insertion of
the withdrawable part towards the service
position must be blocked after only half a turn
of the crank in the clockwise direction, and the
travel motor on motor-operated withdrawable
parts must not be capable of being switched
on.
Do not use force – max. torque 25 Nm!
the test/disconnected
17