R&M Materials Handling WIRE ROPE HOISTS Service - Manual (Page 99)

R&M Materials Handling, Inc.
4501 Gateway Boulevard
Springfield, Ohio 45502
P.: (937) 328-5100
FAX: (937) 325-5319
99/130
R&M Materials Handling, Inc. reserves the right to alter or amend the above information without notice.
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In two-rope systems (True Vertical Lift), replace both ropes simultaneously. Ensure that both ropes
are exactly identical except right/left hand lay.
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In two-rope systems (True Vertical Lift), ensure that both rope are of equal length. A small variation
in length may cause the hook block and the balancing beam to tilt. Adjust the rope length by pulling
one of the ropes further through the wedge housing, until the hook block hangs as straight as
possible (maximum 5 degrees tilt allowed)
• New wire rope shall be taken in use by a load, which is of approx. 10 % of the nominal load. This load
shall be lifted to the total lifting height 5 – 10 times. If the hook tries to turn around during the lifting,
place the hook in the lowest position without load, open the rope end wedge housing and rotate the
wedge housing until the hook is straight.
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Note the correct position of the wedge housing (see sticker).
• Append the rope certificate for the new rope to the documentation for the hoist.
5.31 Overload protection
The overload protection prevents hoisting motion when there is an excessive load. The operating point of
overload protection is stated in the written records for the test drive of the hoist.
Overload protection is achieved by either a mechanical switch or an electronic load sensor.
The mechanical switch is connected to the hoisting circuitry, and controls the hoisting contactor.
The load sensor is connected to a separate condition-monitoring unit. The condition monitoring unit
prevents hoisting motion when there is an excessive load. The overload protectors with a load sensor are
equipped with an additional safety limit-switch.
Overload device, mechanical switch (drum size
φ 243 mm)
c_odqz1b
1 2
3
4
5
6
1. Rope anchorage
2. Lever mechanism
3. Set of plate springs
4. Mechanical limit switch
5. Adjustment screw for mechanical limit switch
6. Lever movement limiter