4. Functioning principles
Contents
This section includes the following topics:
4.1 Sensor functioning principles 31
4.2 Detection fields 32
4.3 System category (according to EN ISO 13849) 33
4.4 Safety working modes and safety functions 35
4.5 Safety working mode: Both (default) 40
4.6 Safety working mode: Always access detection 41
4.7 Safety working mode: Always restart prevention 41
4.8 Features of the restart prevention function 42
4.9 Muting 44
4.10 Anti-tampering functions:anti-rotation around axes 45
4.11 Anti-tampering functions:anti-masking 46
4.12 Multi-control unit Synchronization 47
4.1 Sensor functioning principles
4.1.1 Introduction
LBK-S01 is an FMCW (Frequency Modulated Continuous Wave) radar device based on a proprietary detection
algorithm. LBK-S01 is also a single target sensor that sends pulses and receives information, analyzing the
reflection of the nearest moving target that it encounters.
Each sensor has its own fieldset. The fieldset corresponds to the structure of the field of view, which is composed
of detection fields, see "Detection fields" on the next page.
4.1.2 Factors that influence the reflected signal
The signal reflected by the object depends on several characteristics of the same object:
l material: metallic objects have a very high reflection coefficient, while paper and plastic reflect only a small
portion of the signal.
l surface exposed to the sensor: the greater the surface exposed to the radar, the greater the reflected
signal.
l position with respect to the sensor: all other factors being equal, objects positioned directly in front of the
radar generate a greater signal with respect to objects to the side.
l motion speed
l inclination
All these factors have been analyzed for a human body during the safety validation of LBK System Series and
cannot lead to a dangerous situation. These factors may occasionally influence the behavior of the system
causing spurious activation of the safety function.
This behavior can be minimized with an ad hoc installation and a metal protector kit.
4.1.3 Detected and missed objects
The signal analysis algorithm takes into consideration only those objects that move within the field of view,
ignoring completely static objects.
Furthermore, a falling objects filtering algorithm allows ignoring undesired alarms generated by small work waste
products that fall within the field of view of the sensor.
LBK System Series| Instruction manual v1.2 SET 2021|SAF-UM-LBKBus-en-v1.2|© 2020-2021 Inxpect SpA
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