LIMIT SWITCH ADJUSTMENT
If limit switch operation has been checked as described on
page 7 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 identification of upper and lower limit switches are
indicated on the fiber insulator.
4. Loosen the 2 screws or the spring back the rotatable
guide to disengage the travel nut.
Figure 18. Limit Switches, Models B, C & F
1. Limit switch sub-assy 4. Guide plate
2. Limit switch shaft 5. Screws
3. Traveling nuts
Figure 18A. Rotatable Limit Switches, Models B, C & F
SETTING UPPER LIMIT SWITCH
After completing steps1 thru 4
5. Refer to table 6 -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 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, L, LL, R & RR
1. Limit switch sub-assy 4. Guide plate
2. Limit switch shaft 5. Screws
3. Traveling nuts
Figure 19A. Rotatable Limit Switches, Models J, L, LL,
R & RR
12
2
1
5
4
3
Table 6.
Limit Switches
Model
Max Length
of Lift
Hook Travel, per
Notch w/ 44TPI
Limit Switch Shaft
A
B
m
ft
mm
in
Links mm in
B,F
32.0
105
27.0
1.06
8
610 24.0
C
63.1
207
53.1
2.09
8
610 24.0
J, L
38.7
127
30.4
1.20
8
610 24.0
LL
75.9
249
59.5
2.34
8
610 24.0
R
19.5
64
15.2
0.60
8
610 24.0
RR
37.8
124
29.7
1.17
8
610 24.0
LIMIT SWITCH
BRACKET
ROTATABLE LIMIT
SWITCH GUIDE
Summary of Contents for Entertainment-Lodestar B
Page 49: ...46 NOTES ...
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