SM1 I&M MANUAL/EN/11.16.2010
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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 © (2010) R&M MATERIALS HANDLING, INC. All rights reserved.
6.8
Limit Switches
6.8.1
Upper and Lower Travel Safety Limit Switch
NOTE: When the hoist is supplied in an inverted configuration, as standard, the limit switches are
not included. The slip clutch provides the means to stop the hoist when load chain travel limits are
exceeded.
These limit switches are supplied as standard equipment when the hoist is sold for use in the NORMAL
position.
The Upper and Lower Travel Limit Switches reset automatically and are wired into the “UP” and “DOWN”
control circuits. The switch housing is recessed into the underside of hoist body as part of the lower chain
guide assembly.
NOTE: The upper and lower travel limit switches and/or the slip clutch are emergency protection
devices and are not to be used as automatic stops during normal hoist operations.
When mounted in the NORMAL position, the load hook assembly activates the upper limit switch as it
contacts the limit switch located on the bottom side of hoist body. Once this switch is activated, the “UP”
circuit is opened. The fall stop activates the lower limit switch when load hook assembly is lowered to its
lowest travel position. The limit switch is activated and opens the “DOWN” circuit.
The lower limit position is adjustable between the lowest travel and maximum lift. A fall stop SHALL always
be located at least 3 feet [91.4 cm] from end of last chain link. The upper limit position is adjustable only
when an additional fall stop assembly is added (1-fall units only) between the load hook assembly and the
hoist body.