Adjustments Electric Brake; Limit Switches - CM LODESTAR Manual De Funcionamiento, Mantenimiento Y Piezas

MAINTENANCE (CONTINTUED)
ADJUSTMENTS
ELECTRIC BRAKE ASSEMBLY
The correct air gap between armature and field, when brake is not
energized, is 0.025 inch (.635 mm) and need not be adjusted until
the gap reaches 0.045 inches (1.14 mm). When checking brake gap,
always reset to 0.025 inch (.0635 mm).
To adjust the brake, proceed as follows:
1. Disconnect hoist from power supply.
2. Remove back frame cover, see Figure 13.
3. Before adjusting the gap:
a. back off the stud nuts and examine friction linings and
friction surfaces for excessive wear, (min. thickness .188
inches (4.78 mm)), scoring or warpage.
b. Check shading coils to be sure they are in place and not
broken. A missing or broken shading coil will cause the
brake to be noisy when hoist is operated. Any of these
symptoms indicate the need for replacement of parts.
4. Turn adjusting nuts clockwise gaging the air gap at both ends.
5. Replace cover, reconnect the power and check operation.

LIMIT SWITCHES

If limit switch operation has been checked as described on page 10
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 cover, see Figure 13.
3. The position of upper and lower limit switches are indicated on
the fiber insulator.
4. Loosen the screws to permit guide plate to be moved out of
engagement with the traveling nuts, refer to Figures 16 and 17.
For Rotatable Limit Switch, slightly pull out on the guide spring,
disengaging the the travel nut, refer to figure 16A and 17A.
4
Figure 16. Limit Switches, Models A thru H-2
1. Limit Switch Sub-Assembly
2. Limit Switch Shaft
3. Traveling Nuts
4. Guide Plate
5. Screws
1
2
3
5
(ENGLISH)
Figure 16a. Rotatable Limit Switch, Models A thru H-2
3
2
Figure 17. Limit Switches, Models J thru RRT-2
1. Limit Switch Sub-Assembly
2. Limit Switch Shaft
3. Traveling Nuts
4. Guide Plate
5. Screws
18
1
4 5
P/N: 83874 (REV. 627-T) September 2016