Mhouse GDX Serie Instructions Et Avertissements Pour L'installation page 16

40-d
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• To connect safety devices other than photocells
As well as photocells, the system can also be equipped with other safety
devices with different types of contact. These are:
– devices with "normally open" contact ("NO");
– devices with "normally closed" contact ("NC");
– devices with constant resistance 8,2 KΩ.
These devices can be connected to terminals 1 and 2 on the control unit;
also more than one device can be connected to the same terminals as
described below:
A) – to connect a series of "NO" type devices, use a "parallel" connection
layout as shown the example in fig. 40-e.
40-e
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B) – to connect a series of "NC" devices, use a connection layout "in
series" as shown in the example in fig. 40-f.
40-f
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C) – to connect a series of devices with constant resistance 8,2 KΩ, use
a "parallel" connection layout, positioning the resistance (8,2KΩ) on the
last device, as shown in the example in fig. 40-g.
40-g
D) – to connect a series of devices with different contact types ("NO",
"NC" and constant resistance 8,2 KΩ), use a connection layout in series
and in parallel as shown in the example in fig. 40-h.
40-h
Note – Only the safety devices with an output with constant resist-
ance 8,2 K Ω guarantee safety category 3 against faults according to
the standard EN 954-1.
Activation of these safety devices stops the manoeuvre in progress and a
brief inversion of movement.
• Powering devices other than those specified in this chapter
As well as those mentioned, the system can also be equipped with other
safety devices such as a universal relay receiver. These devices must be
connected to terminals 2 and 3 on the control unit.
CAUTION! – There is a 24 Vdc power voltage on terminals 2 and 3
with delivery of a current of 100 mA. The total absorbed current of
the various devices connected to these terminals must not exceed
this value.
WARNING – On completion of connections, secure all cables using spe-
cial clamps and refit the cover on the control unit.
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"NA" "NC"
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