Protection Against Tampering - SICK IN4000 Standard Manual Del Operador

Operating Instructions
IN4000 Standard
WARNING
© SICK AG • Industrial Safety Systems • Germany • Subject to change without notice 8010934/WQ88/2013-01-15
Product description
3.7

Protection against tampering

The inductive safety switches react to metal objects,
e.g. the frame of a safety door. It must be ensured
that it is not possible to place other metal objects
that are not intended to trigger the safety function
on the sensing face of the safety switches. Suitable
measures must be taken to prevent this situation
arising.
The safety switch 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 regula-
tions 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 0).
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 0)
3
Chapter
167