Honeywell SYA14 Series, Manual

Page: 460 / 737

Installation Instructions for the
ISSUE 1
MICRO SWITCH Explosion-proof Maintained
Cable Pull Limit Switch
PK 81593
MICRO SWITCH Sensing and Control
IMPROPER INSTALLATION
Do NOT use the Maintained Explosion-proof
Cable Pull Limit Switch in lieu of a safety interlock
device. Failure to comply with these instructions
could result in death or serious injury.
GENERAL INFORMATION (Figure 1)
•
Explosion-proof switches are designed
specifically for use in hazardous location
applications. Flame paths within the switch
housing cool exploding gases below the kindling
temperature of the atmosphere.
•
Complies with NEMA standards: 1, 3, 4, 7, 9, 13.
UL listed and CSA certified: Class I, Div 1,
Groups B, C, D; Class II, Div 1, Groups E, F, G.
•
The Explosion-proof Maintained Cable Pull Limit
Switch is designed for use in emergency stop
applications.
•
Single head Cable Pull Limit Switch is 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.
•
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.
•
Available basic switch options:
−
Direct acting switch contact: 1 NC.
−
Direct acting switch contacts: 1 NO 1 NC.
•
Head may be positioned in any of four directions.
Figure 1: Maintained Switch
AUXILIARY CONTACTS
•
Additional contacts electrically isolated from 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
temperature, maximum cable length is 200 ft.
(60 m).
TENSION INDICATOR
•
Convenient tension indicator line on switch
plunger indicates maximum preset cable tension.
OTHER AVAILABLE FEATURES:
•
Conduit opening options.
•
Hardware kits and cables for various length
installations.