LM05 SERIES II I&M MANUAL/EN/11.30.2010
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may not be reproduced, disclosed to third parties, altered or otherwise employed in any manner whatsoever without the express written consent of R&M Materials Handling, Inc.
Copyright © (2010) R&M Materials Handling, Inc. All rights reserved.
7.3 Hoist Motor Brake and Load-Limiting Device
The hoisting motor is equipped with a D.C. electromagnetic disc brake. The brake brings the load to a
smooth and quick stop and holds the load when the motor is not energized. An energized coil releases the
hoist brake to allow the hoisting motor to run freely when in use.
The load-limiting device is a slip clutch and it is integrated into the design of the hoist motor brake. Even if
the clutch slips, once power is removed, the brake will engage to stop and hold the load.
7.3.1 Slip Clutch Operation
When the motor brake is energized, ITEM 1 pulls ITEM 2 away from ITEM 3. ITEM 3 is free to rotate. ITEM
9 applies pressure to ITEM 3 that forces ITEM 3 to engage ITEM 4. The face-to-face contact between
ITEMS 3 & 4 creates an adjustable slip clutch between the motor and the load chain sprocket.
As ITEM 8 is tightened, ITEM 9 applies more pressure on the interface between ITEMS 3 & 4. More
pressure increases the load capacity of the hoist and less pressure decreases the capacity of the hoist.
ITEM 2 is adjusted to allow the hoist to lift 110 – 125 percent of the rated capacity of the hoist.
In the event that the slip clutch begins to slip during the lifting or lowering process, release the hoist motion
control button to stop the motor. This will de-energize the brake. ITEM 2 will now press against ITEMS 3 &
4 to stop rotation and slippage between ITEMS 3 & 4. This will stop and hold the load. Re-adjustment of
ITEM 8 will be necessary to eliminate slipping. See section 7.3.2.
