ENGLISH
6
5.
PROGRAMMING
The board can operate in 4 different modes:
Crepuscular mode
Timed mode with crepuscular control
Timed mode
Bistable mode
5.1
Crepuscular mode
In this mode, the relay which is actually the board output is controlled strictly by the crepuscular sensor.
When incident light on the photo-transistor falls beneath the threshold set with the TR1 trimmer, the LD1 red LED
lights up; 15 seconds after that moment, the output relay is energised; it stays energised for as long as incident light
on the phototransistor does not rise above a threshold set by the TR1 trimmer, but different from the preceding one;
at that moment, the LD1 red LED goes OFF and, after 25 seconds, the relay de-energises; the two thresholds -
lighting up and switching off - are different: the switching off threshold is about double the lighting up threshold, in
terms of luminosity. Light sensitivity and, therefore, the switching off threshold, increase by turning TR1 anti-
clockwise. To ensure that the above relay switchovers occur it is essential that, during the delay time (15 or 20
seconds depending on switching)incident light must not change suddenly and exceed the opposite threshold, i.e.
the LD1 red LED must remain stable.
5.2
Timed mode with crepuscular control
In this mode, the crepuscular sensor supplies clearance for the relay to be energised, if incident light on the FT1
phototransistor falls below the set threshold: 15 seconds after that moment, the board operates in the same way
as in "Timed mode". Before these 15 seconds elapse, the board does not react to any input received through J1, J2
and J3. If, after 15 seconds have elapsed from the time when luminosity had exceeded the lighting up threshold,
luminosity rises again, exceeding the switching off threshold, the LD1 red LED goes off: 25 seconds after that
moment, if the relay had been energised, it de-energises and can no longer be energised by means of the outside
commands, until incident light falls once again under the lighting up threshold. In this case too, to ensure that the
status change occurs, the status of the LD1 red LED must remain stable during the delay time count.
5.3
Timed mode
In this mode, the board behaves like a timed switch, and the crepuscular sensor is ignored. In rest state, the relay
is always de-energised; when a valid energising signal arrives through connectors J1, J2 or J3, the relay energises;
when no energising signal is supplied from outside, the time count begins and, when it has elapsed, the relay de-
energises. If a valid energising signal is received from the outside during the count, the relay remains energised,
and the time count restarts from the beginning when the energising signal from the outside terminates.
5.4
Bistable mode
In this mode, the board behaves like a normal bistable switch; in rest state, the relay can be both energised and
de-energised; any valid energising signal from the outside causes the relay to switch; the relay switches as soon
as the external signal is recognised as valid, and not when it terminates.
6.
SELECTIONS
The operating mode and lighting duration time of the timed modes can be selected with Dipswitch DS1. DIPswiches [1-
6] select the delay time as shown in fig.3. DIPswiches [7 and 8] select the operating modes as shown in fig.3.
1 2 3 4 5 6 7 8
ON
OFF
SW7 SW8 Logic
on on
Crepuscular mode
off on
Timed mode with crepuscular control
on off
Timed mode
off off
Bistable mode
SW1 SW2 SW3 SW4 SW5 SW6
Pause time
off on on on on on
5 sec.
off off on on on on
15 sec.
on off off on on on
30 sec.
on on off off on on
60 sec.
on on on on off on
2 min.
on on on off off on
5 min.
off off off off off on
10 min.
