7
UK
5.2 Protection against simple defeating
The fail-safe sensor reacts to metal objects, e�g� the frame of a security door�
Other metal objects that are not intended to enable the sensor must not be
allowed to enable the fail-safe sensor, either intentionally or unintentionally�
► Take measures to prevent metal objects, except the designated target,
from being placed on the sensing face or in the enable zone intentionally
or unintentionally�
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
concerning the restart of the installation must be observed�
2� If the metal 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 adjustment mode is activated (→ 8�1 Activate adjustment mode)�
Release of the enable zone can be carried out
• by undamping (> 45 mm) for over 2 s
• or by power off
