2
Instruction Booklet
IB48083
Effective August 2014
Vacuum interrupter replacement
SLN018, SL12, SL15, and SJ contactors
EATON
www.eaton.com
4.
Remove control transformer primary fuses
(Classic Ampgard only).
5.
Remove the hollow screw above each interrupter.
6.
Remove the bottle nuts from the top stems, using a screwdriver
as shown in
Figure 3
. Set aside the screws, nuts, and washers.
Figure 3.
7.
Remove the two 5/16-inch bolts attaching each bottle
subassembly. Set bolts aside.
8.
Withdraw the interrupter subassemblies from the contactor
chassis, pulling the bottom end out first so that the top stud
clears the rear frame of the chassis. The contact springs are
loose at this point and should be captured and stored. The bottle
subassembly consists of the interrupter, shunt, and related
hardware. See
Figure 1
.
9.
Remove the old pivot plate from the crossbar. Retain hardware.
10.
Loosen and remove the bottle bolt that holds the copper conduc-
tor to the bottom of the interrupter. Retain the shim from under
the copper conductor and the copper spacer.
CAUTION
AT NO TIME DURING THE INSTALLATION OF THE NEW INTERRUPTER
SHOULD TORQUE BE APPLIED TO THE MOVING END OF THE INTERRUPTER.
INTERNAL DAMAGE MAY RESULT IF TORQUE IS APPLIED. THE USED
INTERRUPTERS SHOULD BE DESTROYED. DESTROYING THE INTERRUPTERS
WILL ENSURE THAT THEY ARE NOT LATER CONSIDERED NEW AND
INSTALLED IN ANOTHER CONTACTOR.
11.
Install the new pivot plate (provided with the new interrupter kit)
on the crossbar.
12.
Fasten the previously removed copper conductor to the new
interrupter with the shim between the mold frame and the
copper conductor. The bottle spacer is installed between the
interrupter and the copper conductor. Do not tighten the bolt
at this time.
13.
Preset the shunt by bending the free end in a smooth curve to
touch the stud, then release.
14.
Install contact springs and cups onto the top stems, with cup on
top, flange down. See
Figure 4
.
Figure 4.
15. Insert bottle subassemblies into chassis, putting top end in
first and guiding the bottle stud into the slot in the pivot plate.
Check to confirm that the spring and cup are between the
interrupter and the crossbar.
16.
Bolt the subassembly to the chassis, using the 5/16-inch bolts,
two per pole.
17.
Align the interrupter on the copper conductor (the bottle bolt is
loose) until the stud does not rub or touch the slot in the hole
in the pivot plate. Tighten the bottle bolt. See
Figure 3
. Check
alignment again to make sure it was maintained while tightening.
18.
Attach shunts to the line side conductor.
19.
Recheck to make sure that the bottle studs remain clear of the
pivot plate. In particular, make certain that the shunts have a
slight bow downward (from
Step 12
) and do not push the bottle
studs against the pivot plate. If they do touch the pivot plate,
loosen the shunts from the line side conductor and repeat
Step 12
before refastening.
20.
Close the contactor by applying rated voltage from an isolated
power source, using adequate care against electrical shock.
21.
Install two bottle nuts, plus the two flat washers previously
removed, onto the center pole bottle stud. Both bottle nuts must
have their threaded flanges facing UP.
