CM Lodestar A - Limit Switch Adjustments; Setting Upper Limit Switch; Setting Lower Limit Switch

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00001996 (REV AC) 627NH October 2014
LIMIT SWITCH ADJUSTMENTS
If limit switch operation has been checked as described on
page 16 and is not operating correctly or is not automatically
stopping the hook at a desired position, proceed as follows:
1. Disconnect hoist from power supply.
2. Remove back frame cover, see Figure 13.
3. The identifi cation of upper and lower limit switches are
indicated on the fi ber insulator.
4. Loosen the 2 screws or spring back the rotatable guide to
disengage the travel nut
Figure 18. Limit Switches, Models A–H
1. Limit switch sub-assy
2. Limit switch shaft
3. Travelling nuts
4. Guide plate
5. Screws
Figure 18A. Rotatable Limit Switches, Models A–H
SETTING UPPER LIMIT SWITCH
After completing steps 1 thru 4
5. Refer to table 6 -The "A" Dimensions given are the
minimum distance that should be set between the top at
hook block and the bottom of the hoist.
CAUTION: THE “A” DIMENSIONS SHOWN IN TABLE 6
ARE THE MINIMUM ALLOWED FOR SAFE OPERATION
AND SHOULD NOT BE REDUCED.
6. Reconnect hoist to power supply.
7. Run hook to the desired upper position,cautiously
operating the hoist without a load.
8. Disconnect hoist from power supply.
9. Moving one travel nut toward the other increases hook
travel and away from the other decreases the travel. .
Now, turn the nut nearest the switch indicated as the “
UPPER LIMIT SWITCH” until it just breaks the limit switch
contacts, cautious not to allow the movement of the other
travel nut, if previously set. An audible click will be heard
as the switch opens. Continue to rotate the nut toward
the switch an additional one full tooth.
Figure 19. Limit Switches, Models J–RRT
1. Limit switch sub-assy
2. Limit switch shaft
3. Traveling nuts
4. Guide plate
5. Screws
Figure 19A. Rotatable Limit Switches, Models J–RRT
10. Securely reposition the guide plate in the slot
11. Reconnect hoist to power supply and check the stopping
point of hook by fi rst lowering the hook about 2 feet (61
cm), then raise the hook by jogging cautiously until the
upper limit switch stops upward motion. The stopping
point of hook should be the desired upper position. If not,
repeat the above instructions.
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