Specifications

T4.31
Light sensitive switches
T4
Setting up a twilight switch for
correct operation
1.Connect the light sensitive sensor or photocell to
the appropriate terminals. In case only one
sensor is used in combination with several 2-
channel light sensitive switches, make sure to
connect terminal 10 only once.
2.Connect the load in series with the output contact
(i.e. for the one-channel with integrated digital
timer, connect terminal 4 with the live, terminal 3
with one side of the load and the other side of
the load with the neutral).
3. Put on the power supply (230V on terminals 1 and 2).
4.Put the no-response on- and off-delay to 0 sec.
5.Turn the knob for the setting of the light-intensity
at switching completely to the left (minimum).
6.Wait for the intensity of the ambient light to reach
the level at which you want the device to switch.
7.Now slowly turn the intensity knob to the
maximum, and stop immediately after you see the
LED lighting up (the output-contact has switched
over simultaneously).
8.Set the on- and off-no-response delay to the
desired value.
9.At this time, the light sensitive switch is set up
correctly.
Remarks
1.If the LED is still off and you are at full scale, then
the intensity of the ambient light is over 500 Lux
at that time. A filter should be applied to the
photocell and the procedure should be carried
out again.
2.If while selecting the threshold, the no-response
delay is other than 0, please bear in mind that the
output-relay won’t switch immediately.
3.Don't put the light-sensor near the light that will
be energised since this of course will lead to
unstable on- and off-switching of the light.
Text for specifiers
- The (programmable) twilight switch is a noise-free
electronic device and has a voltage-free change-
over output contact.
- The output status is shown through a LED on the
front of the device.
- The one-channel twilight switch has a width of
1 module, while the 2-channel and the 1-channel with
integrated digital timer has a width of 3 modules.
- The device is suitable for operating sun-blinds and
shutters.
- At cos ϕ = 1, the output contact is capable of
switching 16A while at cos ϕ = 0.6, a load of 2.5A
can be switched. Switching of a higher load
requires the intermediate use of a contactor.
- The off-threshold level is at least 30% higher than
the on-threshold level.
- The no-response delay is user-presetable between
0 and 100 sec.
- One photocell operates one 1-channel twilight
switch or up to ten (10) 2-channel twilight switches.
- Besides the modular and DIN-rail mountable
devices, an all-in-one wall-mountable device is
available.
- The protection degree of the twilight switch is IP20,
while the photocell is IP65. For the all-in-one wall-
mountable device, the degree of protection is IP54.
- The maximum cable length between the photocell
and the light sensitive switch is 100m (2.5mm
2
).
- For the DIN-rail mountable devices, the safety-
terminals are all captive and have Pozidriv screws
as a standard. Their capacity covers the range
from 1x0.5mm
2
to 1x6mm
2
or 2x2.5mm
2
.
- All DIN-rail-mountable devices are equipped with a
transparent circuit indicator.
Additional specifications for programmable twilight
switches:
- The twilight switch has a built-in digital time
switch with week-program with at least 30
programming steps.
- Block programming is possible.
- Switching accuracy is 1 minute, which is also the
shortest switching time.
- The running reserve is at least 3 years from factory.
- Summer-winter change occurs manually or fixed
automatically.
- Manual override (fix-on, fix-off) is possible at all
time.