3
Fig. 9
Fig. 10
Fig. 11
Fig. 12
The "LS26" combined sun-twilight sensor is necessary to
provide shade in intense sunshine, or for closing the roller
shutter at dusk. This sensor is pressed onto the window
with a suction cup (Fig. 9). The sensor is plugged into the
timer at the bottom right when the front plate is off. Use a
suitable screwdriver to hold the unlock button down while
fitting (Fig. 10). When disassembling, release the latch with
a suitable screwdriver, and pull the plug out of the housing
(Fig. 11).
The function of the sensor, and
adjusting the sun and twilight pa-
rameter:
Sun protection function
A mean light value of 40, corresponding to about 25 thou-
sand lux, is factory set for the intensity of sunshine. If the
brightness of the sunshine stays above the set value, then
a DOWN command is issued after a waiting period of 1.5
minutes. The roller shutter travels to the level of the sen-
sor, stops and then clears it, so that the light intensity can
continue to be measured. A tracking function ensures that
the sensor is cleared again if the sensor is shaded by the
roller shutter when the sun's position changes.
If the intensity of the sunshine stays below the set value
after the roller shutter has lowered, then an UP command
is executed after a waiting period of about 15 minutes.
Twilight function
A mean twilight value of 20 is set at the factory. This cor-
responds to about 60 lux. When the brightness falls below
this value, a DOWN command is executed after 15 min-
utes. It is possible that the DOWN command resulting from
the onset of twilight is issued before the time programmed
for closing the roller shutter. The roller shutter opens again
on the following day at the set switching time.
Changing the preset sun and twi-
light values:
If a sensor is connected to the timer, it is possible to enter
the "Adjust settings" mode by briefly pressing the "S" but-
ton (only possible when the front plate is off). The preset
threshold value for the light intensity (
) appears on
the display. An indicator bar shows whether the light value
currently being measured is smaller than (
, Fig. 12),
equal to (
) or larger than (
) than the set value on
the display. The
and
buttons can be used to change
this value between 01 and 99. The numerical value 99 cor-
responds approximately to a light value of 60 klx (thousand
lux).
Note
Setting a high value means that the roller shutter
will not move down until the sunshine is very bright,
while a low value means that the roller shutter will
move downwards earlier.
A changeover between summer/winter time is made by holding the button down for at least 3 seconds. (It may be necessary to change over repeat-
edly the first time in order to make the time setting you want.) Watch what is shown on the display!
Operation of the U26 with the sun-twilight sensor
By pressing the "S" button briefly, you now move on to
adjustment of the twilight value. The display now shows
for twilight, while the value that has just been set for
the sunshine is stored at the same time.
The indicator bar shows whether the twilight value cur-
rently being measured is smaller than (
, Fig. 13),
equal to (
) or larger than (
) than the displayed
value. The indicator bar only appears when the twilight
value measured is less than 300 lux. The
and
buttons
can be used to change this value between 01 and 99. The
numerical value 99 corresponds to about 300 lux.
Note
Setting a low value delays closure of the roller shut-
ter at twilight, while a higher value causes the roller
shutter to close as soon as twilight begins.
You switch into operating mode by pressing the "S" button
again briefly. The current time appears on the display, and
the settings for the twilight function have been stored.
Note
In order to switch off the sun or twilight function,
enter setting mode and set the corresponding value
to "--" by pressing the " " button.
Attention
Do not cover the sensor to "switch off" the sun pro-
tection function. Shading the sensor can simulate
twilight, and the roller shutter will then close when
you don't want it to. Closing in response to the twi-
light sensor can be delayed or entirely inhibited if
street lights shine on the sensor, or through switch-
ing on the room lighting. In that case it will close in
response to the programmed DOWN command.
Note
If the DOWN command is programmed to a late time
(e.g. 11 p.m.), the roller shutter will move down ear-
lier in response to the twilight setting. This allows
the roller shutter to be closed in response to the
twilight, independently of the programmed switch-
ing time. In winter the roller shutter closes earlier,
and remains open for longer in the summer.
Setting summer/winter time and vice versa
Fig. 13
