2. INSTALLATION
2.1 Preliminary checks
Before installation, the following preliminary checks should be performed on the installation area:
a) The infrared bean between the transmitter and receiver must be direct; it is forbidden to place reflective
screens or other devices between them.
b) The two elements that compose the photocell (TX and RX) must be positioned observing a height of be-
tween 40 and 60 cm from the ground, to the side of the area to be protected.
c) The beam emitted by the transmitter has the shape of a cone. If pairs of photocells are positioned near to
one another, the fitter must crossover the transmitter and receiver positions (pic. 1) or alternatively perform
synchronisation (see the Photocell synchronisation Chap. 2.4).
VISIO photocells use an infrared signal with an operating distance of 20m and make it possible to detect the
presence of obstacles on the optic axis between the transmitter and receiver.
The photocell can be mounted built-in (with AREC box), externally to a vertical surface or bracket-mounted
using AREF support brackets.
External mounting (pic. 3)
Built-in mounting (pic. 4)
Bracket-mounted (pic. 5)
2.2 Photocell connections
The cables used for installation must comply with IEC regulation 60335.
Type
Type of cable
Receiver
4 x 1 mm
² cable
Transmitter
2 x 1 mm
² cable
N and B are used to indicate the two power supply cables.
CAUTION:
Pictures 6 and 7 show the connections for 24 Volt power supply; for a 12 Volt power supply con-
nect the power supply cable to receiver and transmitter terminals 1 and 2.
Description of photocell terminals (TX and RX)
–
pic. 6.
Transmitter
Terminal
Description
1
0 V / a.c. d.c.
–
(negative)
2
12 V / a.c. d.c. + (positive)
3
24 V / a.c. d.c. + (positive)
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