R&M Materials Handling WIRE ROPE HOISTS Service - Manual (Page 36)

R&M Materials Handling, Inc.
4501 Gateway Boulevard
Springfield, Ohio 45502
P.: (937) 328-5100
FAX: (937) 325-5319
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R&M Materials Handling, Inc. reserves the right to alter or amend the above information without notice.
5.11.2 Brake release usage instructions
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Secure the area under and around the hoist. Warn the personnel on the shop floor and the
supervisors about the intended action
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Make sure the area under the hoist is free of obstacles.
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Beware that the motor rotational speed does not exceed the rated rotational speed.
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Ensure that the brake's temperature does not increase uncontrolled
Lower the load as follow:
• Pull the lever arm carefully to open the brake and release immediately when motor stars to rotate.
• Pull and release a few times to study how the rotational speed is growing.
• Once known how the rotational speed behaves, open the brake shortly and close again before the
rotational speed reaches the maximum.
• Let the brake cool down for at least one minute after five times manually opening the brake.
!
When the brake's temperature exceeds 100 °C (water drop boils), let it cool down for a
longer period at higher intervals (e.g. after 4 times opening the brake). Overheating the
brake will damage the friction material and the load may drop.
• Repeat the procedure until the load is lowered safely to the floor.
5.12 Manual crank
Manual brake release and manual crank is used to move the load in case of power failure.
!
In hoist models equipped with 2 hoisting motors (and thus 2 main brakes), both brakes must
be manually opened with levers simultaneously and both motors must be equiped with a
crank. This action requires 2 persons to carry out.
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