Honeywell SYA14 Series Manual page 33

3.5 Mutual Interference or Cross-talk
The FF-SYA Series light curtain is based upon an infrared transmission between an
emitter unit and a receiver unit. It is a safety requirement of the IEC/pr EN 61496-2
standard that if a receiver R2 receives two signals transmitted by two different emitters E1
and E2, the receiver R2 must turn to the alarm state. This happens if the receiver R2 is
within the 2.5° beam aperture angle and within the nominal scanning range of the second
emitter E1, and the cross-talk detection indicator flickers to warn the installer.
MUTUAL INTERFERENCE OR CROSSTALK
Reception of two infrared emissions will maintain the light curtain in a lock-out condition.
To go back to normal operation, switch the power off and eliminate the interferences by
reversing systems emitting orientation or by using opaque screen, or by adjusting the
adequate emission power regarding the application. Then restaure the power.
Figure 3-3 Mutual Interferences between two light curtain sets
R1
R2
R3
alarm
test E
1
E
2
E
1
A selector switch is available on the emitter unit for the selection of the adequat emission
power. It can be used to prevent this cross-talk phenomenon by decreasing the nominal
scanning range.
Figure 3-4 Emission Power selector switch
(1) 54 % of the Nominal
Nominal Scanning Range
Scanning Range
(1): the Nominal Scanning Range is 6 m for the FF-SYA14 light curtain and 18 m for the
SYA30 and FF-SYA60 light curtains (factory settings). To guarantee this nominal scanning range and
the decreased scanning ranges, the devices have a greater effective scanning range with up to 20 %
variations from the nominal values.
107031-23 EN FR26 GLO 1199 Printed in France
OFF ON
R
1
R
2
R
42 % of the Nominal
(1)
Scanning Range
(1)
33
2
FF-