Rockwell Automation 1500 Isolation Switch Handle Interlock Mechanism Engagement Replacement - Manual (Page 16)

1 Bulletin 1500/1900 Isolation Switch Handle – Interlock Mechanism Replacement
1500-IN052C-EN-P – January 2007
To Reduce the Gap Distance
5) Loosen the two screws in the stop bracket and move the stop bracket up
against the interlock lever.
6) With the feeler gauge positioned in the gap, move the interlock lever and the
stop bracket closer to the isolation switch operating lever to reduce the gap
space. Tighten the stop bracket screws.
7) Tighten the nylock nut until it is snug against the contactor operating lever.
Do not overtighten the nylock nut as it will move the interlock lever and reduce
the gap. Proceed to Step 11.
To Increase the Gap Distance
8) Loosen the two screws in the stop bracket and move the stop bracket
away from the interlock lever.
9) Loosen the nylock nut until the gap reaches the desired size.
10) Move the stop bracket until it just touches the interlock lever and tighten the
screws.
11) Apply Loctite 290 (or equivalent adhesive) to the stop bracket screws and
torque the screws to 6 ft.-lb. (8 N•m).
12) Move the isolation switch handle to the ON position.
13) Manually close the contactor by attaching locking pliers to the contactor operating
lever and pushing down until the armature plate contacts the magnetic cores
(see Figure 6).
Contactor Interlock Rod
Armature Plate
Magnetic Core
Contactor Operating Lever
Figure  – Closing Contactor Manually (Some parts not shown)
14) Open the contactor. Verify that the interlock lever and the rod move freely and
that the return springs move the assembly back to the starting position.
Contactor Interlock Rod
Adjustment (cont.)