Protection Against Tampering - SICK IN4000 Direct Manual Del Usuario

Operating Instructions
IN4000 Direct
WARNING
© SICK AG • Industrial Safety Systems • Germany • All rights reserved 8012183/2008-02-01
Product description
2.7

Protection against tampering

The inductive safety sensors react to metal objects,
e.g. the frame of a safety door. It must be ensured
that it is not possible to consciously or accidentally
place other metal objects that are not intended to
trigger the safety function on the sensing face of the
safety sensors. Suitable measures must be taken to
prevent this situation arising.
The safety sensor is protected against simple
bypassing with the following switching behaviour:
The output is operated without delay on the slow
approach of a metal object to the enable zone,
however this situation is only indicated by the signal
LED with a time delay of approx. 3 s. As a result the
object is in general in the near range zone before
the signal LED illuminates. The technical
regulations in relation to restarting the system are
to be observed.
If this object remains in the near range zone for
longer than approx. 2 s, the output is completely
inhibited and no longer enabled on the presence of
activation in the enable zone. If the object remains
in the near range zone for longer than approx. 5 s,
the adjustment mode is activated (see section 4.2).
The enable zone inhibit can be lifted either
by removing the activation (> 30 mm) for a period of
more than 2 s
or
by interrupting the power supply (see section 4.2)
2
Chapter
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