Honeywell SYA14 Series Manual page 456

Installation Instructions for the
MICRO SWITCH Maintained Cable Pull Safety Limit
Switch With Snap Action Head
IMPROPER INSTALLATION
• Consult all local, state, and national law, rules,
codes, and regulations relating to the use of
safety switches, machine interfaces and safety
monitoring that affect safety.
• Strictly adhere to all installation instructions.
Failure to comply with these instructions
could result in death or serious injury.
IMPROPER INSTALLATION
• Do not use input/output (I/O) function (look to see
if SDS or Smart Distributed System is on
nameplate) in emergency-stop applications.
Ensure I/O is used for monitoring only.
Failure to comply with these instructions
could result in death or serious injury.
GENERAL INFORMATION
• The Maintained Cable Pull Safety Limit Switch is
designed for use in emergency stop applications.
• Single or duplex head Cable Pull Safety Limit
Switches are designed to forcibly disconnect a set
of direct acting switch contacts.
• Direct acting switch contacts are held closed
when actuating cables are under proper tension.
When cable is pulled, slackened or broken, a cam
positively opens the switch contacts.
• Snap action operating head causes switch
contacts to change state and mechanically latch
virtually simultaneously when the cable is pulled
to the actuating position.
• Switch contacts remain open until switch is reset
by manually depressing the reset button located
on the actuated operating head.
• When direct acting switch contacts open, auxiliary
contacts also actuate: open contacts close and
closed contacts open.
SINGLE HEAD VERSION (Figure 1)
• Direct acting switch contact: 1 NC (normally
closed).
• Auxiliary contact: 1 NO (normally open).
• Head may be positioned in any of four directions.
MICRO SWITCH Sensing and Control
Figure 1: Single Head Version
DUPLEX HEAD VERSION (Figure 2)
• Primary basic switch (left side of switch):
− Direct acting switch contact: 1 NC.
− Auxiliary contact: 1 NO.
• Auxiliary basic switch (right side of switch):
− Four options available.
• Heads may be positioned in any of three
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
the direct acting switch contacts. These are used
for monitoring or signaling, i.e., indicators, pilot
lights and alarms.
MAXIMUM CABLE LENGTH
• Depending upon variations in ambient
temperature, maximum 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
plunger indicates proper preset cable tension.
OTHER FEATURES AVAILABLE
• Conduit openings and indicator/pilot light options.
• Hardware kits and cables for various length
installations.
ISSUE 3
PK 81592