GE Industrial Solutions PowerVac PV-VL 13.8-1000-0 and -1 - Manual (Page 39)

GEH 6468A - Power/Vac VL Breaker Page 39
To adjust the primary contact wipe, close the
breaker. Remove the front portion of the breaker
top plate, (do not remove the entire top plate
assembly) and proceed as follows:
1. Loosen, but do not remove, the two cap screws
(9, Fig. 22) holding the interrupter clamp.
2. Check that the interrupter clamp is loose. A light
pry at the clamp half junction may be required to
loosen the wedging action of the clamp.
3. Hold the hexagon projection (6, Fig. 22) at the
bottom of the operating rod insulator (1 inch
wrench) and loosen the adjacent locknut (4, Fig.
22), with (3/4 inch wrench). Adjust by rotating the
operating rod insulator. The thread is 1/2-13 and
each turn will give about 0.078 inch change in
primary wipe. Screw the operating rod insulator
toward the interrupter to increase wipe.
4. After setting the contact wipe on each phase,
torque the operating rod locknut (4, Fig. 22) to 40-
50 foot pounds while holding the hex projection (6)
to prevent the operating rod insulator (7) from
turning. Tighten the clamp screws (9) to 8-10 foot
pounds and trip the breaker open. This procedure
prevents accidental twisting of the interrupter's
operating rod by loading the contacts with the wipe
springs and forcing relative rotation to occur at the
clamp interface. After adjustment, remeasure the
wipe dimensions. If the wipe settings are within the
required limits, there is an adequate contact
closing relationship between the poles.
19.3. CONTACT GAP ADJUSTMENT
To adjust the contact gap, remove the front portion
of the breaker top plate. The gap adjustment refers
to the separation, or gap, between the primary
contacts within the vacuum interrupter. Before
attempting to measure or set the gap adjustment,
verify that the wipe settings are within acceptable
limits. Any change of the wipe settings will affect
the gap settings.
1. With the breaker in the open position and the
closing spring discharged, locate the gap adjusting
nuts on the opening spring rods connected to the
outer phase bell cranks (Fig. 27). Loosen the jam
nut on both rods. Back off the adjusting bolt on the
center phase VI stop (Fig. 27).
2. Advance or retard the adjusting nuts depending
on which way you want to change the gap. Move
both nuts the same amount.
3. Lock the jam nuts after setting the adjusting
nuts. Operate the breaker a few times and
remeasure the gap following the procedure
described in DIMENSIONAL CHECKS, item 3.
Readjust the center phase VI stop (Figure 27). Set
adjusting screw for no clearance between stop and
wipe spring rod striker with the breaker open.
19.4. TRIP COIL PLUNGER
To adjust trip coil plunger gap (Figure 32), lift
locktab away from adjusting nut. Turn adjusting nut
until trip pin makes contact with trip arm while
maintaining dimension T. Bend locktab to secure
the adjusting nut.
Reference DIMENSIONAL CHECKS for breaker
position and spring status.
19.5. CLOSE COIL PLUNGER
To adjust close coil plunger gap (Figure 30), lift
locktab away from adjusting nut. Turn adjusting nut
until close latch actuator makes contact with close
latch while maintaining dimension C. Bend locktab
to secure adjusting nut.
Reference DIMENSIONAL CHECKS for breaker
position and spring status.
19.6. CLOSE SPRING DISCHARGE
INTERLOCK
THIS INTERLOCK IS FACTORY SET AND
SHOULD NOT BE ROUTINELY ADJUSTED IN
THE FIELD. The adjustment for this interlock is as
follows. (See Fig. 25).
The breaker should be open with the closing spring
charged.
1. Back off 1/4 inch linkage adjusting screw.
2. While holding roller at 0.995 inch dim., advance
adjusting screw to just touch interlock lever.
3. Close latch must reset as indicated.
19.7. POSITIVE INTERLOCK
THIS INTERLOCK IS FACTORY-SET AND
SHOULD NOT BE ROUTINELY ADJUSTED IN
THE FIELD.