GE Industrial Solutions PowerVac PV-VL 13.8-1000-0 and -1 - Manual (Page 10)

Page 10 GEH 6468A - Power/Vac VL Breaker
The following adjustments are made at the factory
and verified for proper operation per Figure 7. The
distance from the top of the stationary flag to the
top of the switchgear guide rails is set. This
maintains the surface upon which the breaker
wheels rest when the breaker is lowered. The
upper elevating motor limit switch is then adjusted
to achieve a roller to flag clearance of 1/16” to 1/8”
as shown in Figure 7. The limit switch de-energizes
the elevating motor circuit and should be activated
when the primary disconnects and secondary
coupler reach their nominal contact penetration
position. If the timing of this sequence is off, the
cubicle must be adjusted back to factory
specifications.
Instructions for positive interlock adjustment are
detailed on Figures 13, (1000 MVA Equipment),
Figure 14, (M-26 Equipment); and Figure 15, (M-36
Equipment). These adjustments are also detailed
in instruction book GEH-1802X.
5.4 SECONDARY COUPLER
On the top front of the breaker, there is a black
plastic block which holds male secondary coupler
pins. This block should make contact with, and
slightly raise a spring loaded black plastic block
which holds female secondary coupler sockets on
the switchgear. The contact depression should be
1/8”. The stationary block is adjustable in the
vertical direction as described in Service Advice
Letter 073-323-1. It is not always possible to have
the black plastic blocks in contact over their entire
flat surface. Often, the rear of the blocks are
engaged while a gap exists along the front edge.
This is an acceptable condition. The contacting
block surfaces should touch and the female block
edge move upward between 1/32” to 1/8”.
5.5 SPRING DISCHARGE CAM
The purpose of the spring discharge interlock is to
discharge all stored energy in the breaker
mechanism whenever the breaker is withdrawn
from the cubicle. The discharge interlock is located
on the left side of the breaker. The spring
discharge cam mounted in the switchgear should
discharge the breaker closing spring when the
breaker is lowered.
The cam has minimal adjustment provision. The
holes may be slightly slotted to adjust the cam
vertically to allow discharge when the breaker
wheels reach 1/8” to ¼” height above the floor.
Refer to GE drawing 0184B7344 for instructions on
installing a spring discharge cam in the switchgear
cubicle.
5.6 STOPS
The stop pins and stop bolts on the elevating
mechanism are emergency mechanical stops
which would come into use only if the upper
elevating motor switch is completely out of
adjustment or has failed. Elevating against these
stops may be quite audible and the operator should
release the clutch handle, de-energizing the
elevating motor circuit or, the elevating motor
circuit protective fuse will open to protect the
motor. The stop bolts should be set to 3/32 to 1/8”
clearance and only set after all other elevating
adjustments are made.
5.7 GROUND
A visual check should be made to observe the
ground connection. The ground shoe on the
moveable breaker is designed to have a nominal
engagement of 1-½” + ¼” vertically with the steel
and copper spring loaded disconnects of the
ground device in the switchgear.
5.8 POSITION SWITCH (TOC)
The position switch is an optional device mounted
in the rear left side of the switchgear cubicle. The
switch contacts operate when the lifting
mechanism is in either the fully raised or fully
lowered position. Switch operation should be
checked with the breaker withdrawn manually and
the equipment de-energized, and again electrically,
with the breaker in the cubicle. Refer to Service
Advise Letter 073-326.1, dated 5-23-78 for a
description of design changes made to improve the
switch operating mechanism in 1978.
6. TYPICAL WIRING DIAGRAMS