CM LODESTAR 635 Serie Manuel D'entretien, D'opération Et De Pièces page 21

Figure 17a. Rotatable Limit Switch, Models J thru RRT-2
SETTING UPPER LIMIT SWITCH
1. Refer to Table 6-The "A" dimensions given are the minimum
distances that should be set between top of hook block and
bottom of hoist. In other words, the highest allowable hook
position.
CAUTION: the "A" dimensions shown in the table are the
minimum allowed for safe operation and should not be reduced.
2. Reconnect hoist to power supply.
3. Run hook to the desired upper position, cautiously operating
the hoist without a load.
4. Disconnect hoist from power supply.
5. Moving one traveling nut toward the other increasing 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. An
audible click will be heard as the switch opens. Continue to
rotate the nut toward the switch an additional one full tooth.
6. Reposition the guide plate in the next slot and securely tighten
screws.
7. Reconnect hoist to power supply and check the stopping point
of hook by first lowering the hook about 10 inches, 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.
8. Double check the setting by lowering the hook about 24 inches
(609 mm) and then run the hook into the upper limit with p(UP)
control held depressed.
9. Fine adjustment of the upper limit setting may be obtained by
inverting the guide plate in Step 10. The offset on the plate
gives adjustments equivalent to 1/2 notch, see Table 6 for the
Hook Travel Per Notch of Limit Switch Nut." When inverting the
plate, it may be necessary to use the notch adjacent to the one
used in the preliminary setting.
SETTING LOWER LIMIT SWITCH
1. Refer to Table 6-The "B" dimensions given are the minimum
number of load chain links that should be set between the
loose end link and the hoist frame on the loose end side of the
chain. In other words, the lowest allowable hook position.
CAUTION: the "B" dimensions shown in the table are the
minimum allowed for safe operation and should not be reduced.
2. Reconnect hoist to power supply.
3. Run the hook to the desired lower position, cautiously operating
the hoist without a load.
4. Disconnect hoist from power supply.
5. Moving one traveling 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 "LOWER LIMIT SWITCH"
until it just breaks the limit switch contacts. An audible click
will be heard as the switch opens. Continue to rotate the nut
toward the switch an additional one full tooth.
6. Reposition the guide plate in the next slot and securely tighten
screws.
7. Reconnect hoist to power supply, and check the stopping point
of the hook by first raising the hook about 10 inches, then lower
the hook by jogging cautiously until the lower limit switch stops
the downward motion. The stopping point of hook should be
the desired lower position. If not, repeat the above instructions.
8. Double check setting by raising the hook about 24 inches
(609.6 mm) and the run the hook into the lower limit with the
q(DOWN) control held depressed.
9. Fine adjustment of the lower limit setting may be obtained by
inverting the guide plate in Step 10. The offset on the plate
gives adjustments equivalent to 1/2 notch, see Table 6 for the
"Hook Travel Per Notch of Limit Switch Nut". When inverting
the plate, it may be necessary to use the notch adjacent to the
one used in the preliminary setting.
Table 6. Limit Switches
Hook Travel Per Notch of Limit Switch Nut (44TPI)
Max Lengeth
of Lift
Model ft. (M)
A, A-2, C, C-2 204 (62.2)
AA, AA-2 385 (117.3)
B, B-2, F, F-2 102 (31.1)
E, E-2, H, H-2 47 (14.3)
J, J-2, L, L-2 125 (38.1)
JJ, JJ-2 254 (77.4)
LL, LL-2 254 (77.4)
R, R-2 66 (20.1)
RR, RR-2 125 (38.1)
RT, RT-2 44 (13.4)
RRT, RRT-2 83 (25.3)
19
(ENGLISH)
Hook Travel
A in. (mm) B (links)
Per Notch
in. (mm) Min. Min.
1-5/16 (33.3) 1-1/2 (38.1)
2-1/2 (63.5) 2 (30.8)
11/16 (17.5) 1-1/2 (38.1)
11/32 (93.1) 1-3/4 (44.5)
3/4 (19.0) 1-1/2 (38.1)
1-15/32 (37.3) 2-1/2 (63.5)
1-15/32 (37.3) 1-1/2 (38.1)
3/8 (9.5) 2-1/2 (63.5)
3/4 (19.0) 2-1/2 (63.5)
1/4 (6.35) 2-1/2 (63.5)
15/32 (11.9) 2-1/2 (63.5)
P/N: 83874 (REV. 627-T) September 2016
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