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BETA Switching
Timers
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LF4 digital time switches
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Siemens ET B1 · 10/2008
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More information
Mini digital time switches
The Mini digital time switch with a width of only 1 MW and its
hour, day and week program is ideal for replacement and use in
distribution boards with limited space.
The Mini digital time switch can be used flexibly as it can also be
operated in battery mode with all its functionalities. Furthermore,
the actuator of the clock can be removed from its enclosure for
easy programming over the 5-way joystick prior to mounting.
Top, Profi, Astro and Expert digital time switches
Whether you are programming locally using the text-assisted
programming, or sitting comfortably in front of your PC, the task
is quicker and easier with the Top, Profi, Astro and Expert digital
time switches.
Simple operation:
Four programming pushbuttons offer user-friendly assistance
with a text menu.
Easy-to-read display:
And if you need to change the settings of the digital time switch
at the back of a dark control cabinet, the integral background
lighting of the display and the lighting of the control elements
offer a clear overview.
Easy commissioning:
You can get started with the programming straight away. Profi,
Astro and Expert are supplied with the time, date and automatic
daylight savings for Central Europe already set.
Clear contrast:
In order to maintain an overview even in bad light conditions
and extreme temperatures, the contrast of the display can be
adjusted – practical down to the very last detail.
Convenient programming:
It has never been so easy and uncomplicated to operate and
program a digital time switch.
1-
channel time switches allow input of up to 56 switching
programs, 2-channel time switches allow up to 28 programs per
channel and 4-channel time switches up to 84 programs per
channel. This means that the Profi, Astro and Expert time
switches are ideally equipped for even the most complex of
tasks.
Each entry required is clearly indicated so no prolonged studying
of the operating instructions. And, particularly practical: you can
even program the digital time switches without the supply voltage
being applied.
The Profi, Astro and Expert digital time switches offer more than
reliable switching. Numerous integrated convenience functions
make them versatile and simple problem solvers.
A data key enables easy programming of the Profi, Astro and
Expert digital time switches at a PC, simplifies the setting of time
switch programs and saves enormous amounts of time. This
prevents human errors and enables simple copying of complete
time switch programs to different time switches.
Astro function:
The Astro and Expert time switches have one key strength: the
Astro function. The exact time of sunrise and sunset is available
for every location and every day in the year. This means, for
example, that the connected outer lighting is only switched on
when it is dark – whether it is winter when the days are shorter or
in summer when the days are much longer. The benefits are
obvious:
•
Cost-savings, because electricity is only used when the lighting
is really needed, and because this prolongs the service life of
the lighting itself. Particularly in the case of dawn-dependent light-
ing controls
•
Safety and convenience, because the light is always switched
on when it's dark
•
Ease-of-use, because the digital time switch doesn't have to
be reprogrammed throughout the year
•
Installation couldn't be easier, because Astro digital time
switches work in the distribution board. No further need for
laborious cable laying to the light sensors. This means that it
is not necessary to lay cables across the lightning protection
zones. The compact 2-MW series is also ideally suited for
retrofitting or replacement.
It goes without saying that the Astro and Expert digital time
switches don't just switch at dawn and dusk, complex, com-
bined programs are also possible. You always have the choice
between astronomically calculated and individually set switch-
ing times, or a combination of both.
© Siemens AG 2008