Installation Instructions
Original Instructions
Limit Switch Operating Head Replacement
Bulletin Number 802T
Two Pole Vertical Construction - Maintained
Contact
IMPORTANT
It is imperative that the operating head is adjusted
according to these instructions during the replacement or
installation process.
IMPORTANT
5.
6.
ATTENTION: To avoid electrical shock and/or unintended
operation of equipment, disconnect all power to the limit
switch and the controlled equipment before proceeding with
any repair or adjustment of the limit switch.
1.
2.
3.
To remove the old operating head, remove the four mounting screws.
Turn the adjustment screw on the new operating head inward, or
clockwise, until it can turn no further. See Figure 1.
Turn the adjustment screw outward, or counter clockwise, one complete
turn.
IMPORTANT
Verify that the guide button is pushed down firmly on the
spring so that the hook end of the spring fits through the
slot of the guide button and the guide button sits squarely
on the diaphragm assembly, as shown in Figure 1. For the
switch to operate, the square diaphragm button must be
aligned with the square hole in the operating head.
Adjustment Screw
3.
To remove the old operating head, remove the four fillister head screws.
Turn the adjustment screw on the new operating head inward, or
clockwise, until it can turn no further. See Figure 1.
Turn the adjustment screw outward, or counter clockwise, two complete
turns.
IMPORTANT
4.
5.
Figure 1 - Operating Head
Remove the operating head from the base and turn the adjustment screw
outward, or counter clockwise, one additional complete turn.
Fasten the operating head permanently to the base. Tighten the four
mounting screws to approximately 0.68 N•m (6 lb•in).
Side Lever Operated
1.
2.
Side Push Rod Operated
Use a continuity indicator to check across electrical
contacts for proper switch operation. Check both contact
blocks. Do not rely on the audible indication of the switch
action.
Push Hook End of
Spring through Slot in
Guide Button
Guide Button
Spring
Verify that the guide button is pushed down firmly on the
spring so that the hook end of the spring fits through the
slot of the guide button and the guide button sits squarely
on the diaphragm assembly, as shown in Figure 1. For the
switch to operate, the square diaphragm button must be
aligned with the square hole in the operating head.
Secure the operating head to the switch base. Rotate the operating head
shaft slowly from one extreme of travel to the other extreme of travel and
back to the starting point.
Verify that the operating head mechanism goes over center mechanically
in both directions before the switch contacts operate. The mechanical
over center position is the point at which the shaft cannot return toward
its initial position without the aid of an external force. If the switch does
not operate or operates before the mechanical over center position is
reached, turn the adjustment screw outward, or counter clockwise, in 1/3
turn steps (two flats on the adjustment screw) until the contacts operate
properly.
Press Together
IMPORTANT
Diaphragm Assembly
Diaphragm
6.
Secure the operating head to the switch base and check the switch
operation.
a. If the switch contacts operate when the head actuator is moved back
and forth, proceed to step 5.
b. If the switch does not operate, remove the operating head from the
base and turn the adjustment screw outward, or counter clockwise, in
1/3 turn steps (two flats on the adjustment screw) until the switch
operates. Proceed to step 5.
7.
Square Diaphragm Button
4.
Use a continuity indicator to check across electrical
contacts for proper switch operation. Check both contact
blocks. Do not rely on the audible indication of the switch
action.
Remove the operating head from the base and turn the adjustment screw
outward, or counter clockwise, an additional 1/3 turn.
Fasten the operating head permanently to the base. Tighten the four
mounting screws to approximately 0.68 N•m (6 lb•in).
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Publication 802T-IN015A-EN-P - June 2021 | Supersedes Publication XXXX-X.X.X - Month Year
Copyright © 2021 Rockwell Automation, Inc. All rights reserved. Printed in the U.S.A.
40060-222-02
40060-222-02 Ver 03
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