Honeywell SYA14 Series Manual page 450

Installation Instructions for the
MICRO SWITCH Maintained Cable Pull
Limit Switch
GENERAL INFORMATION
The Maintained Cable Pull Limit Switch is
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designed for use in emergency stop applications.
Single or duplex head Cable Pull Limit Switches
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are designed to forcibly disconnect a set of direct
acting switch contacts.
Direct acting switch contacts are held closed
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when actuating cable(s) are under proper
tension. When cable is pulled, slackened or
broken, a cam positively opens the switch
contacts.
Switch contacts remain open until switch is reset
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by manually depressing the reset button located
on the actuated operating head.
When direct acting switch contacts open,
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auxiliary contacts also actuate: open contacts
close and closed contacts open.
SINGLE HEAD VERSION (Figure 1)
Direct acting switch contact: 1 NC (normally
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closed).
Auxiliary contact: 1 NO (normally open).
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Head may be positioned in any of four directions.
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Figure 1: Single Head Version
MICRO SWITCH Sensing and Control
DUPLEX HEAD VERSION (Figure 2)
Primary basic switch (left side of switch):
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- Direct acting switch contact: 1 NC.
- Auxiliary contact: 1 NO.
Auxiliary Basic Switch (right side of switch):
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- Four options available.
Heads may be positioned in any of three
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directions, allowing actuating cables to run in
opposite directions or at right angles to one
another.
Figure 2: Duplex Head Version
AUXILIARY CONTACTS
Additional contacts are electrically isolated from
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the direct acting switch contacts. Used for
monitoring or signaling, i.e., indicators, pilot lights
and alarms.
MAXIMUM ACTUATING CABLE LENGTH
Depending upon variations in ambient
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temperature, maximum cable length in a single
direction is 200 ft. (60 m) for a total of 400 ft.
(120 m).
TENSION INDICATOR
Convenient tension indicator line on switch
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plunger indicates maximum preset cable tension.
OTHER AVAILABLE FEATURES
Conduit openings and indicator/pilot light options.
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Hardware kits and cables for various length
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installations.
Honeywell
lSSUE 3
PK 8156 0