Description And Operation; Overview; General; Rinciple Of Operation - Honeywell SYA14 Series Manual

3. Description and Operation

3.1 Overview

This chapter contains terms and concepts related to safety and the application of the FF-SE. The importance of
the installer's role in the set-up and installation of the machine guarding systems is discussed. This section also
contains specification and order guide information.

3.2 General

The FF-SE is an ElectroSensitive Protective Equipment compliant with category 3 of EN 954-1. It monitors user
defined dangerous zones. As soon as an object or a person penetrates the monitored area, the following events
take place:
Figure 3-1 : Protection zones
3.3 Principle of operation
The type of laser beam used in this sensor is invisible and corresponds to IEC 825 class 1, representing no
hazard to the eyes. The measuring range begins directly in front of the lens.
The fixed test target is to ensure that the beam status is correct, through reflectivity and position check. This
also checks the lens contamination.
Measuring principle
The FF-SE emits a pulsed laser beam (Class 1 infrared laser) rotating in a 360° circle. This circle is obtained
thanks to the reflection of this beam on a revolving mirror. This pulsed laser beam is diffusely reflected by the
surrounding objects, and the returning signal is received by the photo diode. The distance of the object is
determined by measuring the time the laser pulse takes to return to the FF-SE. This measuring principle is
similar to that used in RADAR systems.
At each rotation, the
measurements on 300° (60° are required for the
measurement of the fixed test target). The position of
each beam is determined by an angle encoder.
The position of an object and measuring data can be
determined by connecting a computer to the output
interface.
107006-11 EN FR26 GLO 0300 Printed in Germany
FF-SE carries out 600
•
When an object is present in the alarm zone, the
FF-SE causes the switching of a signalling
(alarm) contact. This contact can be connected
to an acoustic or optical warning device. It
indicates to clear the zone in order to prevent a
shut-down.
•
When an object is present in the safety zone, the
FF-SE causes the switching of two safety
contacts. These contacts trigger an immediate
shut-down of the monitored machine.
The programming software allowing the definition of
the protection areas is sold separately.
Revolving deflector
mirror
Laser lens
Stop watch
stops
Laser receiver
starts
Laser transmitter
Angle encoder
Evaluation of
the distance
Motor
Figure 3-2 : Measuring principle
Laser echo
Laser beam
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