Receiver
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)
4
–
5
NC (normally closed)
4
–
6
NO (normally open)
Perform electric connections in line with the indications given in the manuals of LIFE control devices.
CAUTION:
There must be no yellow-green wires.
Do not pre-seal the wires that are to be fixed to the terminals with screws, if necessary, only seal the tip of
bare wires.
External connection wires must not be of the flat twin tinsel cord type.
Only connect the photocells to the control unit once they have been correctly positioned on their supports.
2.3 Photocell alignment
Once photocell devices have been connected and powered, ensure that they are properly aligned.
Check their height and direction; once alignment has been completed, the red led on the receiver will switch
off.
Incorrect alignment
–
Red led on receiver on
Correct alignment
–
Red led on receiver off
2.4 Photocell synchronisation
CAUTION:
The system only works with an alternating current power supply, as it uses 50 Hz voltage fre-
quency.
If two pairs of photocells are positioned nearby, the ray of the transmitter of the first pair might interfere
with the receiver of the second, and therefore may not guarantee adequate safety (see pic. 1).
A synchronisation system may be used to overcome this drawback.
In order to use synchronisation it is necessary:
- To insert the jumper on the pair of pins on the cards (transmitter and receiver) of the photocells (fig. 8),
this operation must be conducted on both pairs of photocell.
- Perform cable connection as described in pic. 7.
N and B have been used to indicate the two power supply cables.
The diagram refers to a 24 Vac power supply. For 12 Vac operation use terminals 1 and 2 rather than 1 and
3.
If the intervention includes 3 pairs of photocell, the third pair must be connected in the same way as the far-
thest pair.
12
