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5
General information about
the bus system
5.1 General information about installation
The connections of the HMW components can
basically be divided into two groups: the load side
and the control side (24 V power supply, pushbutton
inputs, RS485 bus). As the purpose of the shutter
contact sensor is to detect the switching states of
the connected contacts, it only features the control
side.
Control side
On the control side, however, only non-hazardous
safety extra-low voltages are used. Since there is
electrical isolation between the load and control
sides in the module, no mains power capable wires
have to be used. Using interior telecommunications
wiring or comparable control wiring is recommen-
ded. Make sure, however, that the wires of the load
and the control side are separated conforming with
VDE regulations within the sub-distribution. Keep a
minimum spacing of 8 mm between the two types
of wiring.
24
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