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secret that 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 2020 © R&M Materials Handling Inc. All rights reserved.
4
Hoisting limit switch
Mechanical limit switch
Check the operation of the upper and lower mechanical limit switch.
Drive the hook upwards until the upper mechanical limit switch is activated and prevents further
upward movement of the hook. If the limit switch operates correctly, it stops the motor without
activating the friction torque limiter when the limit is reached.
In the same way, check the correct operation of the lower mechanical limit switch by driving the
hook downwards until the lower limit switch is activated.
Rotating geared limit switch (option, not available for all models)
Check the operation of the limit switch.
If the hoist is equipped with electrical limit switches, check for correct operation of the limits by
raising and lowering the hook at low speed, until the limit switches are activated and prevent
further upward or downward movement.
If the limit switches do not activate at the chosen position, adjust the limits according to the
instructions given in chapter
Limit switch. If the limits cannot be adjusted, the rotating geared limit
switch needs to be replaced.
Functional description of the rotating geared limit switch
2-step rotating geared limit switch
The 2-step geared limit switch works together with the internal controls as an adjustable upper and
lower stop limit.
4-step rotating geared limit switch
The 4-step geared limit switch provides, together with the internal controls, an adjustable upper
and lower stop limit.
Two (2) of the cams are not connected to the controls, and can thus be freely used for end-user
requirements.
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Traveling limit switch (option)
Check that traveling limit switches are in the center position before driving against the notch.
Adjust the triggering locations of the traveling limit switch. Check the operation of the limit switch.
After adjusting traveling limits, do the start-up procedure for the traveling inverter (not in all
models).
Check that control method for traveling is correct.
The traveling limit switches must always be adjusted before the
commissioning tests can be continued.
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Buffers and buffer stops
Check that the buffer hits center of the buffer stop. Check that the hoist buffers are able to bump
into the runway end stops or buffers of other trolley.
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Operating sound and movements
Listen to the operating sound when the product is hoisting or traveling. Pay attention to unusual
noises such as squealing.
Check that the hoist is running smoothly. There should not be any strong vibration.