Honeywell SYA14 Series Manual page 39

3.7.4 Vertical Mounting / Side by Side Installation
MUTUAL INTERFERENCE OR CROSSTALK
When two or more light curtain systems are installed on adjacent machines, optical
interference may occur if two units are within the field of view. Mutual interference
between light curtains can be eliminated by reversing systems emitting orientation, or by
using opaque screens, or by adjusting the adequate emission power regarding the
application. A selector switch is available on the emitter unit for this purpose. Reception of
2 infrared emissions will maintain the light curtain in a lock-out condition. To go back to
normal operation, switch off and on the light curtain power.
The FF-SYA light curtain is based upon an infrared transmission between an emitter unit
and a receiver unit. It is a requirement of the IEC/pr EN 61496-2 standard that if a
receiver receives two signals transmitted by two different emitters, this receiver must turn
to the alarm state for safety reasons. This happens if the considered receiver is within the
2.5° beam aperture angle and within the nominal scanning range of a second emitter, and
when the cross-talk detection indicator flickers to warn the installer.
Figure 3-13 Side by side installation of two light curtains
or
Eliminating mutual interferences by Eliminating mutual interferences by
reversing systems emission orientation. using an opaque screen or by adjusting
the emitter 1 emission power (see
Mutual interference or cross-talk
chapter).
107031-23 EN FR26 GLO 1199 Printed in France 39