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11-6 Control Switch
Adjustment
The breaker is to be in the open position with
the opening and closing springs discharged.
Thisresults in the control switch plungers be-
ing in the depressed position. Four sets of
switches are to be checked. On the LCS (Figure
37, Item 5) and stacked switches (SM/LS & CHG)
(Figure 37) the plunger rod is to be recessed
within the rear of the switch body. The recess
should measure between 0 and 1/32 inch. This
is a visual check.
1 Charging crank
2 Switch actuator
3 Actuator roller
Figure 37. SM/LS & CHG switch adjustment -
left side view
The close latch monitor switch, CL/MS and the
positive Interlock switch are a different type.
They have a plunger that extends 1-3/16" from
the switch frame.
switches are actuated and closed when the
breaker is not being operated. The switch
closes when the switch plunger is depressed
between 1/32" and 1/16" and remains closed
throughout the remainder of the travel. The
CL/MS switch should open when the close latch
is being actuated and must be opened before
the latch moves far enough to close the breaker.
This is a visual check. The positive interlock
switch should open as the postive interlock
shaft rotates and must be opened before the
positive interlock trips the breaker. This is a vi-
sual check. See Figure 38.
Courtesy of NationalSwitchgear.com
4 Switch mounting bracket
5 SM/LS & CHG switch
6 Switch plunger
These normally open
PowerVac
Chapter 11. Mechanical Adjustments
1 Positive Interlock actuator
2 Positive Interlock switch
3 Switch adjustment nuts
Figure 38. CL/MS and positive Interlock
switch adjustment -right side view
11-7 Adjustment of MOC Switch
The Stationary Auxiliary Switch is an optional
switch mounted in the switchgear cubicle.
When the breaker has been elevated to the fully
connected position, the switch will be actuated
whenever the breaker is closed. The switch is
actuated by the plunger interlock (plunger)
mounted on the top of the breaker mechanism.
The switch has a number of "a" contacts (closed
when the breaker is closed and open when the
breaker is open) and "b" contacts (open when
the breaker is closed and closed when the
breaker is open). The following paragraph de-
fines the essential dimensions relating to the
interfacing elements of the breaker and
switchgear, to assure reliable performance.
The following elements are important factors
which commonly affect the operation of the sta-
tionary auxiliary switch.
1. Plunger travel on the breaker.
2. The gap between the top of the plunger on
the breaker and the bottom of the rod on the
stationary auxiliary switch mechanism.
3. Variations between breakers in the distance
from the underside of the lift rail and the top of
the plunger.
4. Variations in the rotation requirements to
"make" and "break" the stationary auxiliary
switch contacts.
5. Condition of the plunger interlock compo-
nents on the breaker.
39
5kV Vertical Lift
®
4 Close latch
5 CL/MS (switch)
6 Switch plunger
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