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This document and the information contained herein, is the exclusive property of R&M Materials Handling Inc. and represents a non-public, confidential and proprietary trade
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.
NOTICE
Only use the emergency stop button to stop movement in the event of malfunction or
other emergency situation. Using the emergency stop button can cause the load to
swing unexpectedly.
4.2.2
Safety Functions
Hoisting unit
Device
Description
Emergency stop button
The emergency stop button is used to turn off power to the system in dangerous situations. The
emergency stop button cuts the supply voltage to the system from the main contactor. Always eliminate
the danger before releasing the emergency stop button. There are several types of emergency stop
buttons, but they are always red.
Friction torque limiter
Friction torque limiter protects the machinery against overloading. Overload occurs at around 110 % of the
rated capacity of the hoist. When activated (at around 150 %
– 160 % static load), the friction torque limiter
prevents further hoisting but it is still possible to lower the load. Never use the friction torque limiter to
assess the weight of the load.
Second disk brake (holding
brake) (option)
The second disk brake (holding brake) supports the load if the main brake fails. The second disk brake
closes just after the main brake and opens just before the main brake. For more information about the
secondary brake, see chapter Checking the brake lining.
Upper and lower mechanical
limit switch
The mechanical limit switches are adjusted to prevent the hook from moving too high or low, which may
cause damages. When the chain stop touches the limit switches, it is activated, which stops the hook
movement. The upper limit switch stops the upward hook movement, and the lower limit switch the
downward hook movement. It is, however, not recommended to use the mechanical limit switches as
operational end stops.
Trolley
Device
Description
Emergency stop button
The emergency stop button is used to turn off power to the system in dangerous situations. The
emergency stop button cuts the supply voltage to the system from the main contactor. Always eliminate
the danger before releasing the emergency stop button.
Stop limit switch (option)
The stop limit switch prevents the trolley from traveling beyond a certain point at the end of the bridge. The
trolley can only be driven in the opposite direction when the switch is activated.
Slow-down limit switch (option)
After passing the slow-down limit switch, the trolley can only move at a low speed towards the end of the
bridge (traveling beam).
Two-step travel limit switch
(option)
The two-step travel limit switch stops the travel motion of the trolley. When the first limit is activated, the
travel motion switches from fast to slow. When the second limit is activated, it stops the travel motion
before reaching the end of the bridge.
Derailment catches
Derailment catches prevent the trolley from coming off of the bridge rail due to obstacles on the bridge, for
example.
4.3
Signs
Note:
Example signs are shown for illustration purposes only and do not necessarily match the data on your
product.