5�2 Protection Against Simple Defeating - Reer PI M30 NF K Notice D'utilisation

* Typical values for damping with a reference target of 45 x 45 x 1 mm and non-flush
installation to IEC 60947-5-2 at an ambient temperature of 20 °C�
Depending on the characteristics of the damping element there may be no
close zone�
5.2 Protection against simple defeating
The fail-safe sensor reacts to metal objects, e�g� the frame of a safety door� Other
metal objects that are not intended to enable the sensor must not be allowed to
enable the fail-safe sensor unintentionally�
► Take measures to prevent metal objects, except the designated target,
from being placed on the sensing face or in the enable zone unintention-
ally�
In addition, the sensor has the following switching characteristics to make simple
defeating of its safety function more difficult:
1� By slowly introducing a metallic object into the enable zone, the outputs are
immediately switched, but displayed by the LED with a delay of approx. 3 s (→
9�2�1 Delayed switching of the LED)� By doing so, the object is generally in the
close range before the LED indication is lit� The technical instructions concern-
ing the restart of the installation must be observed�
2� If the object remains in the close zone for over approx� 2 s, the outputs are
completely disabled and no longer enabled in case of damping in the enable
zone� If the object stays in the close range for longer than approx� 5 s, the set-
ting aid is activated (→ 8.1).
Release of the enable zone can be carried out
• either by undamping (> 30 mm) for a time of more than 2 s
• or by a voltage interruption (→ 8.3 Deactivate setting aid).
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