Masking Conditions - Inxpect LBK System Instruction Manual

4. Functioning principles
sends a tampering signal to the controller. Upon reception of a tampering signal, the controller de-energizes
the safety outputs.
4.5.2 Masking signal
The sensor detects the presence of objects that could obstruct the field of vision. When the system
configuration is saved, the sensor memorizes the surrounding environment in a one meter radius. If the
sensor subsequently detects variations in the environment that could influence the field of vision, it sends a
masking signal to the controller. Upon reception of a masking signal, the controller de-energizes the safety
outputs. For details, see "Masking conditions" below.

4.6 Masking conditions

4.6.1 Environment memorization process
The sensor starts the surrounding environment memorization process when the Inxpect Safety application
configuration is saved. From that moment, it waits for the system to exit the alarm status and then scans
and memorizes the environment for 15 seconds.
It is recommended to start the memorization process after at least 3 minutes from turning on the system to
guarantee that the sensor has reached the working temperature.
Only at the conclusion of the memorization process it is possible for the sensor to send masking signals.
4.6.2 Causes of masking
Possible causes of masking signals are presented as follows:
an object has been placed inside of the stopping area that obstructs the field of vision of the sensor.
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the environment in the stopping area changes significantly, for example, if the sensor is installed on
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moving parts or if there are moving parts inside of the stopping area.
the configuration has been saved with sensors installed in an environment that is different from the
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working environment.
4.6.3 Masking signal when the system is turned on
If the system was off for several hours and there were temperature fluctuations, the sensor might send a
false masking signal when it is turned on. The signal deactivates automatically within 3 minutes when the
sensor reaches its working temperature.
4.6.4 Disable masking signals
WARNING! If the function is disabled the system cannot signal the presence of possible objects
that obstruct normal detection. See "Inspections with masking signals disabled" below.
In the Inxpect Safety application >
4.6.5 Inspections with masking signals disabled
If masking signals are disabled, it is the responsibility of the operator to perform the following inspections:
sensor position unchanged with respect to the initial installation
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field of vision of the sensor free of objects
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When the masking function is disabled, perform the following controls.
Safety function
Detection function
Restart prevention
function
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> Sensors, disable the Masking function.
Schedule
Before each machinery restart
Each time the safety relays are
de-energized
LBK System | Instruction manual v1.2 FEB 2019 | LBK-System_instructions_en v1.2 | © 2018-2019 Inxpect SpA
Action
Remove any objects that obstruct the field of
vision of the sensor.
Reposition the sensor according to the initial
installation.