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BETA Switching
Timers
7
LF5 mechanical time switches
9/11
Siemens ET B1 · 10/2008
9
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Overview
These days, time switching is taken for granted.
These days, energy savings through time switching has become
a matter of course. In fact, it is now hard to imagine many
process sequences without time switching.
Mechanical time switches are used wherever the minimum
switching interval is sufficient. The switching control pins can be
set without the use of tools at minimum intervals of 15 minutes.
They can be used for switching systems or system components,
or for functions, such as: irrigation systems, greenhouses, public
gardens, swimming pools, filtering installations, canopy controls,
church bells, shop window lighting, advertising lighting, gym
lighting, traffic signal controls, street lighting, illuminated signs,
office lighting, lighting of stairwells and entrances, object
illumination, preheating of industrial furnaces, sprayingmachines,
ovens, heating systems, air-conditioning systems, fans and
ventilation systems, heating and circulation pumps and sauna
systems.
All devices have the VDE mark and are approved to UL.
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Benefits
•
The automatic make ready system automatically sets the
clock timers during commissioning. No need to manually
adjust the pointer for daylight savings.
•
The automatic make ready system also continues to operate
automatically after a power failure. No need for manual time
reset.
•
The precision quartz clock mechanism adds all clock errors to
approx. +/- 1 min clock accuracy per year. So there is also no
need to reset the clock timer during operation.
© Siemens AG 2008