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11-4 Trip Coil Plunger Gap
To adjust the trip coil plunger gap (Figure 32),
lift locktab (item 6) away from adjusting nut
(item 5). Turn adjusting nut until actuator arm
makes contact with trip lever (item 8) while
maintaining dimension T. Bend locktab to
secure adjusting nut.
The trip coil plunger gap is shown in Figure
32. With the closing spring removed, posi-
tion the closing camshaft for that the latch
roller is in contact with close latch. Ensure
that the close roller (Figure 32) is reset and in
contact with the close cam.
Depress the trip plunger until it contacts the
trip release lever arm. Set the gap between the
under side of the trip plunger mushroom head
(Figure 32, Item 1 and Figure 34), and the top
of the trip coil housing (Figure 32, Item 2) to
0.375.
Allow the trip plunger to fully reset and
loosen the lover collar (Figure 32, Item 4) and
push it upwards to remove all the free play in
the positive interlock trip release linkage and
tighten the set screws.
Measure the angle the positive interlock lever
moves until the interlock trip release linkage
(Figure 32, Item 7) causes contact with the trip
release lever arm (Figure 32, Item 8); it is to be
4° or less.
Continue rotating the positive interlock lever
until it reaches the hard stop position and
observe that the trip release lever arm has
rotated about 0.125.
Figure 33. Trip coil button with gage
Courtesy of NationalSwitchgear.com
PowerVac
Chapter 11. Mechanical Adjustments
T=
1
Plunger base
2
Trip coil assembly
3
Positive interlock cam
4
Collar & set screw
5
Adjusting nut
Figure 32. Trip coil gap adjustment
Figure 34. Trip coil assembly
37
5kV Vertical Lift
®
6 Locking clip
7 Trip pin
8 Trip lever
9 Actuator arm
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