GE Industrial Solutions PowerVac PV-VL 13.8-1000-0 and -1 - Manual (Page 8)

Page 8 GEH 6468A - Power/Vac VL Breaker
5. Drill two #22 (.157) diameter holes in the
positive interlock cam plate from locations in new
bracket supplied with kit. See Figure 2.
6. Install two #10-24 thread cutting screws
(supplied with kit).
7. Install the new clutch switch cover plate
supplied with the kit using the existing hardware.
8. All breaker cubicles that undergo this modi-
fication to the positive interlock cam plate must be
checked according to the dimensions given in
Figure 7.
a. The 10-7/8” +1/16” -0” dimension from the
breaker to the front edge of the positive interlock
cam plate must be verified and maintained prior to
inserting a replacement PVVL vacuum breaker into
the cubicle. See Figure 7(C).
b. The 1/16” clearance between the stationary
flag, just behind the upper “Vee” notch and the
interlock roller must be maintained or reset if
required. The breaker should be in the fully raised
position. See Figure 7(A).
4.4 CHECKING FOR PROPER INTERLOCK
AND
TRIP FREE FUNCTIONS BEFORE LOWER-
ING THE BREAKER FROM THE ELEVATED
POSITION.
When the breaker is in the fully elevated and
connected position, releasing the motor operating
handle will return the positive interlock roller into
the upper notch in the interlock cam plate, closing
the interlock switches and energizing the circuit
that will charge the springs. The breaker may now
be closed.
In order to lower the breaker from the connected
position, the breaker must be open. If the breaker
is not open, the operator can not, and should not
be able to engage the clutch or activate the motor
circuit. The positive interlock roller will remain
locked and will not allow the interlock cam plate to
move vertically far enough to activate the
elevating motor.
To test the function of the positive interlock system
and trip free function, the following checks should
be made:
1. With the breaker closed and in the elevated
position, the positive interlock roller on the breaker
must remain locked and not allow the motor handle
to be moved far enough to engage the clutch and
close the clutch switch contacts that energize
the motor circuit. There should be 1/16” clearance
between the clutch and motor coupler, when the
motor handle is pulled forward. See Figure 7(A).
2. Disconnect the elevating motor plug from its
socket.
3. Trip the breaker to the open position.
4. Using the manual charging handle, charge the
closing springs in the breaker until the semaphore
shows “charged”.
5. Pull back the elevating handle on the motor so
that the interlock roller is at the dimension shown in
Figure 7. (11/16” +0 -1/16) Hold it in this position
while pressing the manual close push button on the
breaker. The main power springs must discharge
and the breaker must remain open, as indicated by
the semaphores on the front of the breaker. This
indicates that the breaker contacts will not close
during raising or lowering the breaker.
5. ADJUSTMENTS TO BREAKER/SWITCH-
GEAR INTERFACES.
The interfacing parts on all ratings of type AM
breakers and switchgear are functionally the same.
5.1 STATIONARY AUXILIARY SWITCH (MOC)
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 switach 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 defines 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 stationary
auxiliary switch.
1. Plunger travel on the breaker.