Honeywell SYA14 Series Manual page 277

FF-SM Series Installation Manual
Theory of Operation (cont'd)
Using fiber optic technology, the safety mat is designed to be immune to electromagnetic
disturbances.
A load distributor is part of the sensor mechanics and protects the sensing surface from
damage caused by the falling of heavy objects (such as a 5 kg (11 lb.) steel sphere dropped
from a 1 m (3.3 ft) height). Due to the mechanical structure of the sensor, the safety mat is
resistant to occasional overloads due to fork lift trucks, and features an exceptional life
expectancy when used in normal conditions.
The available industrial mat surface coatings provide excellent chemical resistance . This
sensor (mat), with its IP 67 (NEMA 6) sealing rating, may be used in the food and
beverage industry.
The design of this safety mat (sensor) complies with the requirements of the EN 954-1
European standard for category 3 protective equipment.
Control Unit
The control unit operates in an automatic restart mode (the machine operating condition is
restored after power up and after any actuation and de-actuation of the mat sensor). In this
mode another part of the safety control circuitry (for instance, Honeywell's safety control
modules) must keep the latched function engaged in a safe way.
The control unit has two safety relays with positive guided contacts that can be directly
used to stop the dangerous movement. However, for most applications, additional safety
control modules or safety relays sometimes called Final Switching Devices (FSDs) are
necessary between the control unit safety outputs and the machine control circuitry.
The control unit complies with EN 954 (Safety Related Parts Of Control System) for category
4 protective equipment based on its permanent self-checking principle.
A test input is also available on the control unit. The test input allows an operator to set the
equipment in an alarm condition for test purposes. This function simulates an activation of the
protective equipment and allows external circuitry to check the correct operation of the
external machine control circuitry (external relays, etc.).
For application help: see Warranty Information
Honeywell • PK 107007 EN FR26 GLO 0298 Printed in France 3
Description and Operation