Replacement Of Components; Testing Withdrawable Parts With A Vd4 Type Circuit-Breaker; Motor-Operated Withdrawable Parts; Checking The Correctness Of Dimensional Settings - ABB VD4 Instruction Manual

5.4.2 Replacement of components

1. Withdrawable assembly:
(Figures 5/2 to 5/6)
• Disconnect plug connector (10.3) (only for
withdrawable assembly of type B)
• Remove interlock rod (13.91) with pin (13.27)
from the withdrawable assembly
• For motorized withdrawable assemblies, re-
move the two socket head bolts which are
accessible from below the assembly
• Unbolt the circuit-breaker from the withdra-
wable assembly (4 x M12 bolts)
• Mount the circuit-breaker on a new with-
drawable assembly in the reverse order, using
new circlip and special pliers for pin (13.27)
• Check the setting of interlocking rod (13.91):
– Turn spindlel (18) anti-clockwise to the stop
for the disconnected position:
The distance between lever (13.26) and cam
(13.25) must be 2
The distance between roller (13.24) and blok-
king bracket (13.92) must be 0.2-0.5 mm.
– Turn spindle (18) clockwise to the stop for
the service position:
The distance between lever (13.26) and cam
(13.25) must be 2
The distance between roller (13.24) and
blocking bracket (13.92) must be 0.2-0.5
mm.
– Loosen bolts (13.91.2 or 13.92.1) for any
necessary adjustment.
For further details on repairs, see also the
relevant sections of manual BA 359.
5.5 Testing withdrawable parts with a VD4 type
circuit-breaker
When functional tests are carried out on withdra-
wable parts, compliance with the con ditions listed
below should also be checked. In this context, a
distinction should be made between two types of
the devices for the VD4 withdrawable part:
• Type A: Withdrawable assembly without inte-
grated auxiliary switches (manual operation only).
• Type B: Withdrawable assembly with integrated
auxiliary switches (manual or motorized operation).
5.5.1 Motor-driven withdrawable parts
(non-standard)
Carry out testing of motor-driven withdrawable
parts in the same way as for manually operated
withdrawable part:
• Turn off the supply voltage (m.c.b.), since the
motor could otherwise be braked electrically.
• Turn hand crank (121) in the required direction.
mm.
+1
mm.
+1
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.

5.5.2 Checking the correctness of dimensional settings

(Figures 5/2 to 5/6)
1. The distance between lever (13.26) operated by
link rod (13.91) and plastic cam (13.25) should
be 2 mm. If adjustment is required, release the
+1
two bolts (13.91.1) and (13.91.2). Deviations from
the specified value can have the following effects:
• Dimensions too large, blocking system for the
drive spindle deactivated.
• Dimensions too small, proper action of the
electrical interlock no longer guaranteed.
2. The distance between roller (13.24) and angle
lever (13.92) should be 0.2-0.5 mm when the
circuit-breaker is closed.
If adjustment is required, release the two bolts
(13.91.2) and (13.92.1)
5.5.3 Checking auxiliary switch settings on type A with-
drawable parts
(Figure 5/2)
Compliance with the interlock conditions in the areas
of the test/disconnected position and the service
position is ensured by auxiliary switch -S6, located
in the breaker housing and factory-set.
In test operations, the withdrawable part must be
moved by hand with the crank fitted.
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 -S6 must then operate when
the hand crank has a remaining angle of ≥ 60
of turn to reach the stop.
• Slowly insert the withdrawable part from the
test/disconnected position towards the service
position until auxiliary switch -S6 just operates.
In this position, it must still just be possible to
move closing push rod (13.2.1). For this test,
the function of the blocking magnet -Y0 must
be deactivated manually.
This condition ensures that the electrical
interlock takes effect before the mechanical
interlock in the motion sequence involved.
o
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