GE Industrial Solutions PowerVac PV-VL 13.8-1000-0 and -1 - Manual (Page 38)

Page 38 GEH 6468A - Power/Vac VL Breaker
shaft, or loosen clamping bolt in operating link.
Observe and make note of the direction of the
index mark on the end of the shaft and the position
of the operating link in relation to the stop screw.
Remove mounting hardware securing auxiliary
switch to mechanism plate. Slide auxiliary switch
and shaft out of operating link. Before removing
any wires from switch terminals, make sure they
are properly tagged with switch terminal numbers
to assure proper placement on new switch.
Remove wires.
To install new switch, attach leads then install
switch, or install switch then attach leads
depending upon type of switch and its terminal
accessibility. Install switch shaft in operating link
with index mark aligned as noted above. Reverse
above procedure to complete installation.
17.9. MOTOR REPLACEMENT
With the breaker open and the closing spring
discharged, remove auxiliary switch as described
above but do not disconnect leads. Move switch
toward side of mechanism far enough to clear
motor and tie there temporarily. Disconnect motor
leads. Remove the long bolt and spacer securing
the motor to the mechanism mid-plate. Remove
the two socket head cap screws securing the motor
to the mechanism top plate using a 5/16" Allen
socket and a 24" extension. Disengage the motor
output shaft from the charge linkage arms and
withdraw motor.
To install the new motor, reverse the above
procedure.
17.10. "Y" RELAY REPLACEMENT
Before removing the "Y" relay, make sure all leads
are marked with terminal locations. Next,
disconnect all leads and remove the two fasteners
securing the "Y" relay's shock absorbing mounting
bracket to the mechanism rear plate. Withdraw
relay and bracket. Remove fasteners securing
relay to mounting bracket.
Reverse above procedure to install new relay.
18. RENEWAL PARTS
It is recommended that sufficient renewal parts be
carried in stock to enable the prompt replacement
of any worn, broken or damaged parts. A stock of
such parts minimizes service interruptions caused
by breakdowns, and saves time and expense.
When continuous operation is a primary
consideration, more renewal parts should be
carried, the amount depending upon the severity of
the service and the time required to secure
replacements.
Renewal parts which are furnished may not be
identical to the original parts, but they will be
interchangeable.
A separate Renewal Parts Bulletin may be
available from your local GE Sales office.
18.1. ORDERING INSTRUCTIONS
1. Always specify the complete nameplate date of
both the breaker and the mechanism.
2. Specify the quantity, catalog number (if listed),
reference number (if listed), and description of
each part ordered, and the parts bulletin number.
3. Standard hardware, such as screws, bolts, nuts,
washers, etc. are not listed in this bulletin. Such
items should be purchased locally.
4. For prices or information on parts not listed in
the Renewal Parts Bulletin, refer to the nearest GE
office.
19. MECHANICAL ADJUSTMENTS
19.1 GENERAL
The ML-18VL Mechanism has been designed for
extended intervals between maintenance. In most
cases only the wipe and gap adjustments will
require re-setting throughout the life of the circuit
breaker.
19.2. WIPE ADJUSTMENT
Wipe is the additional compression of a preloaded
spring, used to apply force to the vacuum
interrupter contacts and to provide opening kick-off
force. Always adjust the contact wipe before
adjusting the gap.
An indicator is provided on the wipe spring
assembly with graduations given in 0.05 inch on
which the wipe is indicated directly. See Figure 22.
Improved accuracy of the wipe measurement may
be obtained by using a feeler gauge between the
top of the wipe indicator and the erosion disk. The
difference in readings on each pole with the
breaker closed and open is the contact wipe.
Adjustment not required if wipe is more than 0.075
inch. After adjustment the wipe should be 0.15-
0.18 inch.