17
10001921 REV AC
July 2019
Table 8. Limit Switch - Dimensions
Model
Hook Travel, per
Notch
A (minimum
distance between
top of hook block
and bottom of hoist)
B (minimum length
of loose end chain
non-inverted)
mm
in
mm
in
C
52.8
2.08
38.1
1.50
6 links
B, F
26.9
1.06
38.1
1.50
6 links
J, L
30.5
1.20
38.1
1.50
8 links
JJ, LL
116.8
4.60
63.5
2.50
8 links
R
15.2
0.60
63.5
2.50
8 links
RR
29.7
1.17
63.5
2.50
8 links
RRS
30.0
1.18
63.5
2.50
30 links
Figure 16. Limit Switches, Models B-F
1. Limit switch sub-assy
2. Limit switch shaft
3. Traveling nuts
4. Guide plate
5. Screws
Figure 17. Rotatable Limit Switches, Models B-F
SETTING UPPER LIMIT SWITCH
After completing steps 1 thru 4
5. Refer to Table 8 -The "A" Dimensions given are the minimum
distance that should be set between the top hook block and the
bottom of the hoist.
CAUTION: THE “A” DIMENSIONS SHOWN IN TABLE 8
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 18. Limit Switches, Models J-RRS
1. Limit switch sub-assy
2. Limit switch shaft
3. Traveling nuts
4. Guide plate
5. Screws
Figure 19. Rotatable Limit Switches, Models J-RRS
