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PowerVac
5kV Vertical Lift
®
Chapter 11. Mechanical Adjustments
11-5 Close Coil Plunger
Adjustment
To adjust the close coil plunger gap (Figure 36)
The closing system is shown in Figure 35. With
the closing spring discharged, operate the
plunger to make certain that the plunger moves
freely over its full stroke in the coil. To check the
closing coil plunger gap the breaker should be
open and the closing spring charged and
gagged.
Adjusting plate (Figure 35 Item 10) is spring
loaded against the pivot for the arm-this set the
close coil actuating arm (Figure 34 Item 1). The
collar and washer (Figure 35 Item 4 & Item 5)
are assembled to the close plunger (Figure 36
Item 3) to the dimension indicated (.375"). This
is the initial adjustment.
Measure the gap between the close plunger top
clevis (Figure 36, Item 7) and the close coil hous-
ing (Figure 36, Item 1) when the attached lever
is depressed and contacts the close release le-
ver. (Varies from 0.375 - 0.560)
Release the plunger and set the plunger collar
(Figure 36, Item 4) so that the close plunger
clevis is at the previously measured gap plus
0.25.
Rotate the positive interlock lever until it reaches
18°, set the close plunger clevis gap to the close
housing to 0.032 - 0.094 by adjusting the length
of the vertical link descending from the posi-
tive interlock shaft.
Courtesy of NationalSwitchgear.com
11
12
10
1 Close latch actuator
2 Close return spring
3 Close plunger clevis
4 Close plunger
5 Close coil
6 Positive interlock linkage 10 Adjusting plate
Figure 35. Close coil assembly -front view
0.375" - 0.560"
approx. 0.187"
1 Close coil
2 Manual close arm
3 Close plunger
Figure 36. Close coil gap adjustment -
front view
38
1
2
3
4
5
6
7
8
9
7 Manual close arm
8 Adjusting collar &
set screw
9 Manual actuating
shaft
11 Manual close button
12 CL/MS (switch)
6
0.350" - 0.437"
4
3
4 Collar & set screws
5 Washer
6 Positive interlock arm
7 Close Plunger Clevis
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