Inxpect LBK System User manual

Instructions translated from the original
LBK System
Instruction manual
v1.2 - EN
Volumetric Safety System
WARNING! Whoever uses this system must read the instruction manual for their safety. Read and
adhere to the "Safety information" chapter in its entirety before using the system for the first time.

Copyright © 2018-2019, Inxpect SpA
All rights reserved in all countries.
Any distribution, alteration, translation or reproduction, partial or total, of this
document is strictly prohibited unless with prior authorization in writing from
Inxpect SpA, with the exception of the following actions:
lPrinting the document in its original format, totally or partially.
lTransferring the document on websites or other electronic systems.
lCopying contents without any modification and stating Inxpect SpA as
copyright owner.
Inxpect SpA reserves the right to make modifications or improvements to the
relative documentation without prior notice.
Requests for authorization, additional copies of this manual or technical
information on the latter, must be addressed to:
Inxpect SpA
Via del Serpente, 91
25131 Brescia (BS)
Italy
[e-mail]
[phone]

Contents
Glossary of terms 4
1. This manual 6
1.1 Information on this manual 6
2. Safety 7
2.1 Safety information 7
2.2 Conformity 8
3. Get to know LBK System 10
3.1 LBK System 10
3.2 Controller LBK-C22 11
3.3 Sensors LBK-S01 13
3.4 Inxpect Safety application 13
4. Functioning principles 15
4.1 Sensor functioning principles 15
4.2 Detection function 15
4.3 Restart prevention function 16
4.4 Muting 17
4.5 Tamper-proof functions 17
4.6 Masking conditions 18
5. Sensor position 20
5.1 Basic concepts 20
5.2 Sensor field of vision 21
5.3 Calculation of position for sensor height < 1 m 22
5.4 Calculation of position for sensor height > 1 m 25
5.5 Dangerous area calculation 26
6. Applications 29
6.1 Applications overview 29
6.2 Linear barrier (complete restart prevention) 30
6.3 Linear barrier (limited restart prevention) 32
6.4 Other applications 35
7. Installation and use procedures 37
7.1 Before installation 37
7.2 Install and configure LBK System 37
7.3 Validate safety functions 41
7.4 Manage the configuration 43
7.5 Other functions 44
8. Maintenance and troubleshooting 45
8.1 Troubleshooting 45
8.2 System log 46
8.3 Cleaning and spare parts 48
8.4 Periodical tests 49
8.5 Updates 49
9. Technical references 50
9.1 Technical data 51
9.2 Terminal blocks and connectors pin-outs 52
9.3 Electrical connections 54
10. Appendix 59
10.1 Disposal 59
10.2 Service and warranty 59
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Glossary of terms
D
Dangerous area
Area to be monitored because it is dangerous for people.
Detection area
Portion of the field of vision where detection is guaranteed.
F
Field of vision
Sensor area of vision. It is composed of two areas: detection area and uncertainty area. It can have
two ranges: 110° and 50°
FMCW
Frequency Modulated Continuous Wave.
M
Machinery
The system for which the dangerous area is monitored.
Monitored area
Area actually monitored by the system. Includes the stopping area, and only for detection function,
any pre-alarm area.
P
Pre-alarm area
Only for the detection function. Area where motion detection triggers the closure of the dedicated
auxiliary relay.
S
Stopping area
Portion of the area monitored by the sensor where, if motion is detected, the system safety relays
are de-energized. If it does not correspond to the dangerous area defined in the risk assessment,
the residual risk must be calculated and additional safety measures must be introduced.
T
Tolerance area
Portion of the monitored area where detection is not guaranteed.
Glossary of terms

U
Uncertainty area
Area of the field of vision where detection or not of an object depends on the characteristics of the
same object.
Glossary of terms
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1. This manual
1.1 Information on this manual
1.1.1 Objectives of this instruction manual
This manual explains how to integrate LBK System to protect machinery operators and how to install it, use it
and maintain it safely.
These instructions do not pertain to the functioning of the machinery where LBK System is installed.
1.1.2 Obligations with regard to this manual
NOTICE: this manual is an integral part of the product and must be kept for its entire working life.
It must be consulted for all situations related to the life cycle of the product from its delivery through to
decommissioning.
It must be conserved so that it is accessible to operators, in a clean location and in good condition.
In the event of manual loss or damage, contact Customer Assistance Service.
Always enclose the manual when the equipment is sold.
1.1.3 Updates to the instruction manual
Publication
date Code Updates
FEB 2019 LBK-System_
instructions_en v1.2
Added 50° field of vision ("Sensor field of vision" on page21)
Added application validation procedure Inxpect Safety ("Validate safety
functions" on page41)
Updated contents for installation of sensors at heights over 1 m (3.3 ft)
Integration for masking signals ("Masking conditions" on page18)
Added formulas for calculation of sensor position ("Calculation of
position for sensor height > 1 m" on page25
Reorganization of topics
SEP 2018 LBK-System_
instructions_en v1.1
"Tamper-proof functions" on page17
Changed and integrated the section "Applications" on page29
Added working frequency setting
Changed voltage and current values for safety relays
JUN 2018 LBK-System_
instructions_en v1.0
First publication
1.1.4 Intended users of this instruction manual
The recipients of the instruction manual are:
lThe designer of the machinery onto which the system will be installed
lSystem installer
lMachinery maintenance technician
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2. SAFETY
2.1 Safety information
2.1.1 SAFETY MESSAGES
Warnings related to safety of the user and equipment as envisaged in this document are as follows:
WARNING! indicates a hazardous situation which, if not avoided, may cause death or serious
injury.
NOTICE: indicates obligations that if not observed may cause damage to the equipment.
2.1.2 PERSONNEL SKILLS
The recipients of this manual and the skills required for each activity presented herein are as follows:
Recipient Assignments Skills
Machinery
designer
lDefines which protection devices
should be installed and installation
specifications
lKnowledge of significant dangers of the
machinery that must be mitigated based on
risk assessment.
lKnowledge of the entire machinery safety
system and the system on which it is
installed.
Protection
system installer
lInstalls the system
lConfigures the system
lPrints configuration report
lAdvanced technical knowledge in the
electrical and industrial safety fields
lKnowledge of the dimensions of the
dangerous area of the machinery to be
monitored
lReceives instructions from the machinery
designer
Machinery
maintenance
technician
lPerforms maintenance on the
system
lAdvanced technical knowledge in the
electrical and industrial safety fields
2.1.3 FORESEEN USE
LBK System is certified as SIL 2 according to IEC/EN 62061 and PL d in accordance with EN ISO 13849-1.
Performs the following safety functions:
ldetection function: prevents access to a dangerous area. Access to the area de-energizes the safety
relays to stop the machinery's moving parts.
lrestart prevention function: prevents unexpected starting or restarting of the machinery. Detection of
motion within the dangerous area maintains the safety relays de-energized to prevent machinery
starting.
LBK System is suitable for protecting the entire body.
LBK System has been designed to monitor dangerous areas in industrial environments. Thanks to IP67
protection grade, the sensors are suitable for indoor and outdoor installations.
2.1.4 GENERAL WARNINGS
lWrong installation and configuration of the system decreases or inhibits the protective function of the
system. Follow the instructions provided in this manual for correct installation, configuration and
validation of the system.
lChanges to the system configuration may compromise the protective function of the system. After any
changes made to the configuration, validate correct functioning of the system by following the
instructions provided in this manual.
lIf the system configuration allows access to the dangerous area without detection, implement additional
safety measures (e.g. guards).

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lThe presence of static objects, in particular metallic objects, within the field of vision may limit the
efficiency of sensor detection. Keep the sensor field of vision unobstructed.
lThe system protection level (SIL 2, PL d) must be compatible with the requirements set forth in the risk
assessment.
lCheck that the temperature of the areas where the system is stored and installed is compatible with the
storage and operating temperatures indicated in the technical data of this manual.
2.1.5 WARNINGS FOR THE RESTART PREVENTION FUNCTION
lThe restart prevention function is not guaranteed in blind spots. If required by the risk assessment,
implement adequate safety measures in those areas.
lMachinery restarting must be enabled only in safe conditions. The restart enable button must be installed:
loutside of the dangerous area
lnot accessible from the dangerous area
lin a point where the dangerous area is fully visible
2.1.6 RESPONSIBILITY
The machinery designer and system installer are responsible for:
lProviding adequate integration of the system's outgoing signals (both safety and auxiliary).
lChecking the monitored area of the system and validating it based on the needs of the application and
risk assessment. Following the instructions provided in this manual.
2.1.7 LIMITS
lThe system does not detect the presence of inert people or objects within the dangerous area.
lThe system does not offer protection from pieces ejected from the machinery, from radiation, and objects
falling from above.
lThe machinery command must be electronically controlled.
2.2 Conformity
2.2.1 DIRECTIVES AND STANDARDS
Conformity
Directives 2006/42/EC (MD - Machinery)
2014/53/EU (RED - Radio equipment)
Standards IEC/EN 62061: 2005 SIL 2
EN ISO 13849-1: 2015 PL d
EN ISO 13849-2: 2012
IEC/EN 61496-1: 2013
IEC/EN 61508: 2010 Part 1-7 SIL 2
ETSI EN 300 440 v2.1.1
ETSI EN 301 489-1 v2.2.0 (only
emissions)
ETSI EN 301 489-3 v2.1.1 (only
emissions)
IEC/EN 61326-3-1:2017
IEC/EN 61010-1: 2010
Note: no type of fault has been excluded during the system analysis and design phase.

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2.2.2 DECLARATION OF CONFORMITY AND CERTIFICATIONS
The manufacturer, Inxpect SpA, declares that the type of radio equipment LBK System complies with the
directive 2014/53/EU. The full EU declaration of conformity text is available on the company's website at the
address www.inxpect.com.
At the same address all updated certifications are available for download.
2.2.3 FCC CERTIFICATION
LBK System complies with FCC CFR title 47, part 15, subpart B. It contains FCC ID: UXS-SMR-3X4.
Operation is subject to the following two conditions:
lthis device may not cause harmful interference, and
lthis device must accept any interference received, including interference that may cause undesired
operation
NOTICE: changes or modifications made to this equipment and not explicitly approved by Inxpect SpA may void the
FCC authorization to operate this equipment.
2.2.4 NATIONAL RESTRICTIONS
LBK System is a short range device in class 2 in accordance with the directive 2014/53/EU (RED - Radio
equipment) and is subject to the following restrictions:
UK FR
In Regno Unito e in Francia, l'allocazione nazionale delle frequenze non permette il libero uso dell'intera banda
24-24,25 GHz. Impostare correttamente il paese nell'applicativo Inxpect Safety e la banda autorizzata verrà
automaticamente selezionata.
Restrictions in UK. In the United Kingdom, the national allocation of frequencies does not allow the free use
of the whole band 24-24.25 GHz. Set the country correctly in the Inxpect Safety application and the
authorized band will be automatically selected.
Restrictions en FR. En France, la répartition nationale des fréquences ne permet pas la libre utilisation de la
bande entière 24-24,25 GHz. Définissez le pays correctement dans l’application Inxpect Safety et la bande
autorisée sera automatiquement sélectionnée.

3. Get to know LBK System
Contents
This section includes the following topics:
3.1 LBK System 10
3.2 Controller LBK-C22 11
3.3 Sensors LBK-S01 13
3.4 Inxpect Safety application 13
3.1 LBK System
3.1.1 Description
LBK is an active protection radar system that monitors the dangerous areas of a machinery. It performs two
safety functions:
ldetection function: it places the machinery in safe conditions when someone enters the dangerous
area
lrestart prevention function: it inhibits the machinery restart if there are people in the dangerous area
3.1.2 Inputs and outputs
Thanks to its digital inputs and outputs, LBK System provides an automatic control system that manages
the primary safety functions of the machinery.
In addition to safety outputs, the system is also fitted with two configurable auxiliary outputs (fault, pre-
alarm and muting status) and three digital inputs (emergency button, restart enable button and muting).
3.1.3 Special features
Some of the special features of this protection system are presented as follows:
lresistant to dust, water, smoke and work waste
lpre-alarm area to signal proximity or prepare the machinery for stopping
lthree configurable sensitivity levels
lmuting on the entire system or only on some sensors
3.1.4 Main components
LBK System is composed of a controller and up to six sensors. The Inxpect Safety software application
allows configuration and inspection of system functioning.
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3.1.5 Controller - sensors communication
The sensors communicate with the controller via CAN bus using diagnostic mechanisms in compliance with
standard EN 50325-5 to guarantee SIL 2 and PL d.
For correct functioning, each sensor must be assigned with an identification (ID). Two sensors on the same
bus must have different IDs.
The default settings for the sensors is ID = 0, or no assigned ID.
3.1.6 Applications
LBK System integrates with the machinery control system: when performing safety functions or detecting
faults, LBK System de-energizes the safety relays and keeps them de-energized, so the control system can
command safety conditions of the area and/or prevent restarting of the machinery.
In the absence of other control systems, LBK System can be connected to the devices that control the power
supply or machinery start-up (e.g. external relays on the power supply line).
LBK System does not perform normal machinery control functions.
For connection examples, see "Electrical connections" on page54.
3.2 Controller LBK-C22
3.2.1 Functions
The controller performs the following functions:
lCollects information from all the sensors via CAN bus.
lCompares the position of detected motion with the set stopping and pre-alarm thresholds.
lDe-energizes the safety output relays when at least one sensor detects motion in the stopping area.
lDe-energizes the safety output relays if a fault is detected in the sensor or the controller.
lManages the auxiliary inputs and outputs (to learn about the functions see "Auxiliary outputs" on the
next page and "Digital inputs" on the next page).
lCommunicates with the Inxpect Safety software for all configuration and diagnostic functions.
3.2.2 Structure
Part Description
ADIP switch to include/exclude the termination resistance:
lOn (default) =resistance included
lOff = resistance excluded
BDigital inputs status LED
CSensors CAN bus terminal block
DMicro USB port for connecting the computer and communicating with the Inxpect Safety
software
ESafety outputs status LED
FAuxiliary outputs status LED
GPower supply terminal block
HDigital inputs terminal block
3. Get to know LBK System
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Part Description
ISensors status LED
LSafety outputs terminal block
MAuxiliary outputs terminal block
3.2.3 Sensors status LED
The LEDs are each dedicated to a sensor, and can display the following statuses:
Status Meaning
Green Normal functioning and no detected motion
Orange Normal functioning and motion detected
Flashing red Error. See "Controller LED" on page45
3.2.4 Inputs and outputs status LED
The meaning of the LEDs when they are on is as follows:
LED Meaning
Safety output Energized relay (closed contact)
Auxiliary output Energized relay (closed contact)
Digital input High logic level (1)
3.2.5 Safety outputs
The controller has one dual channel safety output realized with forced guided safety relays for alarms and,
direct or indirect, safety of the machinery.
3.2.6 Safety outputs status
The relay contacts are normally open. The statuses of the safety outputs are as follows:
lde-energized relay (open contact):
lmotion detected in stopping area or
lfault detected in system
lenergized relay (contact closed): no motion detected and normal functioning
3.2.7 Auxiliary outputs
The controller has two relay outputs, which can be configured via the Inxpect Safety application, for:
lpre-alarm
lfault
lmuting status
3.2.8 Auxiliary outputs status
The statuses of the auxiliary outputs are as follows:
Output De-energized relay (open contact) Energized relay (closed contact)
Pre-alarm No motion detected in the pre-alarm area Motion detected in the pre-alarm area
Fault Fault Normal functioning
Muting status Muting disabled Muting enabled
3.2.9 Digital inputs
The controller has three dual channel digital inputs and common reference potential for:
lmuting (high logic level (1) = muting enabled)
lmachinery emergency button (low logic level (0) = stopping enabled)
lmachinery restart button enabled (high logic level (1) = restart enabled)
3. Get to know LBK System

The inputs are type1, type 2 and type 3 (see "Voltage and current limits for digital inputs" on page53).
The function of the inputs can be configured through the Inxpect Safety application.
3.2.10 SNS input
The controller also has an SNS input (high logic level (1) = 24 V) to check the correct functioning of the chip
that detects the status of the inputs.
NOTICE: if at least one input is connected, the SNS input must also be connected.
3.3 Sensors LBK-S01
3.3.1 Functions
The sensors perform the following functions:
lDetect motion in their field of vision.
lSend the motion detection signal to the controller through CAN bus.
lSignal faults detected in diagnostics on the controller through CAN bus.
3.3.2 Structure
Part Description
ASensor
BScrews for fastening the sensor at a specific inclination
CPerforated bracket for installing the sensor on the ground or on the machinery
DStatus LED
EConnectors for connecting the sensors in a chain and to the controller
3.3.3 Status LED
Status Meaning
Steady on Normal functioning and no detected motion
Rapid flashing on (100 ms) Normal functioning and motion detected
Other conditions Error. See "Sensor LED" on page45
3.4 Inxpect Safety application
3.4.1 Functions
The application is used to perform the following main functions:
lConfigure the system.
lPrint configuration report.
3. Get to know LBK System
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lCheck system functioning.
lDownload system log.
3.4.2 Access
The application can be downloaded for free at www.inxpect.com/industrial/tools.
Some functions are password protected. The password must be set through the application and is saved on
the controller. The available functions according to access type are presented as follows:
Available functions Access type
lDisplay the system status (Dashboard)
lDisplay the sensors configuration (Configuration)
lPerform maintenance operations (Maintenance)
lDownload the system log and display the reports ( > Activity history)
lRestore factory default settings ( > General)
lExport the configuration ( > General)
lValidate the system (Validation)
without password
lAll the available functions without password
lConfigure the system (Configuration and )
lImport the configuration ( > General)
lChange the access password ( > User account)
lUpdate the firmware ( > General)
with password
3.4.3 Main menu
Page Function
Dashboard Display the system status:
lcontroller status,
lsensors status,
lstatus of auxiliary inputs and outputs and relative set function.
Display the date of the next scheduled periodical test.
Display the sensitivity settings.
Configuration Define the configuration of the sensors and monitored area.
Validation Start the validation procedure.
Maintenance Start the wizard for periodical test.
Display the date of the next scheduled periodical test.
Display the performed periodical tests report.
Configure the sensors.
Configure the auxiliary inputs and outputs function.
Update the firmware.
Export/import the configuration.
Download the log.
Other general functions.
Enable access to the configuration functions. Password required.
3.4.4 Configuration report
After changing the configuration, the system generates a configuration report with the following
information:
lconfiguration data
ldate and time of configuration change
lname of computer where the change was inserted
The reports are documents that cannot be changed, and can only be printed and signed by the person
assigned to the task.
3. Get to know LBK System

4. Functioning principles
Contents
This section includes the following topics:
4.1 Sensor functioning principles 15
4.2 Detection function 15
4.3 Restart prevention function 16
4.4 Muting 17
4.5 Tamper-proof functions 17
4.6 Masking conditions 18
4.1 Sensor functioning principles
4.1.1 Introduction
The LBK-S01 sensor is an FMCW (Frequency Modulated Continuous Wave) radar device based on a
proprietary detection algorithm. The sensor sends impulses and obtains information, analyzing the
reflection of the objects that it encounters.
4.1.2 Factors that influence the reflected signal
The signal reflected by the object depends on several characteristics of the same object:
lmaterial: metallic objects have a very high reflection coefficient, while paper and plastic reflect only a
small portion of the signal.
lsurface exposed to the sensor: the greater the surface exposed to the radar, the greater the reflected
signal.
lposition with respect to the sensor: objects positioned perfectly in front of the radar generate a greater
signal with respect to side objects.
lmotion speed: the faster the motion of the object, the greater the reflected signal
4.1.3 Signaled and missed objects
Many objects inside of an industrial environment reflect the radar signal. The signal analysis algorithm takes
into consideration only those objects that move within the field of vision, ignoring completely static objects.
Furthermore, a falling objects filtering algorithm allows ignoring false alarms generated by work waste
products that fall within the field of vision of the sensor.
4.2 Detection function
4.2.1 Description
The function de-energizes the safety relays and prevents the machinery from restarting if motion is detected
in the system stopping area.
For the detection function the sensor can be set with 50° or 110° field of vision. For details, see "Sensor field
of vision" on page21.
WARNING! The stopping area may not correspond to the defined dangerous area according to the
risk assessment. Calculate the actual dimensions based on the field of vision of the single sensor
(see "Sensor position" on page20) and perform the validation of the function (see "Validate safety
functions" on page41). If necessary, implement additional safety measures.
Note: for linear barrier application, the stopping area is calculated automatically by the Inxpect Safety application based on the set
dimensions of the dangerous area and the configuration of the sensors.
4.2.2 Pre-alarm area
A pre-alarm area can be configured, where if the machinery is functioning and the system detects motion,
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the dedicated auxiliary output relay closes. For example, this is useful for connecting a light or acoustic
signal. The pre-alarm area is defined through the Inxpect Safety application.
4.3 Restart prevention function
4.3.1 Description
The function maintains safety relays de-energized and prevents the machinery from restarting if motion is
detected in the system stopping area.
After motion is detected, even a motion of only a few millimeters (e.g. a person breathing) prevents the
machinery from restarting.
WARNING! The stopping area may not correspond to the defined dangerous area according to the
risk assessment. Calculate the actual dimensions based on the field of vision of the single sensor
(see "Sensor position" on page20) and perform the validation of the function (see "Validate safety
functions" on page41). If necessary, implement additional safety measures.
Note: for linear barrier application, the stopping area is calculated automatically by the Inxpect Safety application based on the set
dimensions of the dangerous area and the configuration of the sensors.
4.3.2 Function limits
The coverage of the restart prevention function is defined by the geometry of the field of vision. The field of
vision of the sensor depends on the inclination and height of the sensor installation, see "Sensor position" on
page20.
For the restart prevention function, a sensor set with 50° field of vision has the same coverage as the 110°
field of vision.
NOTICE: during the configuration phase, take this aspect into consideration to avoid generating false alarms.
4.3.3 Types of managed restart
NOTICE: it is the responsibility of the machinery designer to assess if automatic restart prevention can guarantee the
same level of safety as manual restart (as defined in standard EN ISO 13849-1:2006, section 5.2.2).
The system manages three types of restart prevention:
Type Conditions for enabling machinery restart
Automatic The time interval set through the Inxpect Safety application has passed since the last motion
detection*.
Manual The status of the restart enable button indicates that the restart is enabled (digital input status
= 1).
Safe
manual
lThe time interval set through the Inxpect Safety application has passed since the last
motion detection* and
lthe status of the restart enable button indicates that the restart is enabled (digital input
status = 1).
Note *: machinery restart is enabled if no motion is detected up to 50 cm (19.7 in) beyond the stopping area.
4.3.4 Precautions for preventing automatic restarting
To prevent automatic restarting the following rules must be followed:
lthe set time interval must be more than or equal to 10 s.
lif the sensor is installed less than 30 cm from the ground a minimum distance of 30 cm from the
sensor must be guaranteed.
4.3.5 Enable the restart prevention function
Type Procedure
Automatic In the Inxpect Safety application > > Sensors, set in Restart timeout the desired delay
interval.
Manual 1. Connect the machinery restart enable button conveniently, see "Electrical connections" on
page54.
2. In the Inxpect Safety application > > Sensors, set Restart timeout = 0.
4. Functioning principles

Type Procedure
Safe
manual
1. Connect the machinery restart enable button conveniently, see "Electrical connections" on
page54.
2. In the Inxpect Safety application > > Sensors, set in Restart timeout the desired delay
interval.
4.4 Muting
4.4.1 Description
Muting temporarily suspends the safety functions. Motion detection is disabled and therefore the controller
maintains the safety outputs in an energized state even when the sensors detect motion in the stopping
area.
4.4.2 Muting enabling
The muting can be enabled through digital input for all the sensors simultaneously or only for a group of
sensors. Up to three groups can be configured, each associated to a digital input.
Through the Inxpect Safety application, it is necessary to define:
lfor each input, the group of managed sensors
lfor each group, the sensors that belong to it
See "Configure the auxiliary inputs and outputs" on page38.
4.4.3 Example of sensors - groups association
4.4.4 Example of digital inputs - groups association
4.4.5 Muting status
Any auxiliary output dedicated to the muting status is closed if at least one of the groups of sensors is in
muting.
NOTICE: it is the responsibility of the machinery designer to assess if the status indicator of the muting is necessary
(as set forth in standard EN ISO 13849-1:2006, section 5.2.5).
4.5 Tamper-proof functions
4.5.1 Tampering signal
The sensor is fitted with an accelerometer that detects inclination. When the system configuration is saved,
the sensor memorizes the set inclination. If the sensor subsequently detects variations in inclination, it
4. Functioning principles
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18 LBK System| Instruction manual v1.2 FEB 2019 |LBK-System_instructions_en v1.2|© 2018-2019 Inxpect SpA
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:
lan object has been placed inside of the stopping area that obstructs the field of vision of the sensor.
lthe environment in the stopping area changes significantly, for example, if the sensor is installed on
moving parts or if there are moving parts inside of the stopping area.
lthe configuration has been saved with sensors installed in an environment that is different from the
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 > > Sensors, disable the Masking function.
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:
lsensor position unchanged with respect to the initial installation
lfield of vision of the sensor free of objects
When the masking function is disabled, perform the following controls.
Safety function Schedule Action
Detection function Before each machinery restart Remove any objects that obstruct the field of
vision of the sensor.
Reposition the sensor according to the initial
installation.
Restart prevention
function
Each time the safety relays are
de-energized
4. Functioning principles

4.6.6 When to disable
Some conditions in which it is necessary to disable the masking signals are presented as follows:
l(with restart prevention function) the monitored area includes moving parts that stop in different and
unpredictable positions,
lthe monitored area includes moving parts that vary their position while the sensors are in muting,
lthe sensor is positioned on a part that can be moved,
lthe presence of static objects is tolerated in the monitored area (e.g. loading/unloading area).
4. Functioning principles
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5. Sensor position
Contents
This section includes the following topics:
5.1 Basic concepts 20
5.2 Sensor field of vision 21
5.3 Calculation of position for sensor height < 1 m 22
5.4 Calculation of position for sensor height > 1 m 25
5.5 Dangerous area calculation 26
5.1 Basic concepts
5.1.1 Determining factors
The optimum position of the sensor depends on:
lsensor field of vision
ldepth of the dangerous area (and therefore the stopping area)
lsensor installation height
lsensor inclination
lthe presence of other sensors (see "Applications" on page29)
The actual field of vision of the sensor depends on the height of installation and inclination of the sensor.
5.1.2 Sensor installation height
The installation height (h) is the distance between the center of the sensor and the ground or installation
base of the sensor.
5.1.3 Sensor inclination
The sensor inclination is the angle between the center of the field of vision of the sensor and the parallel line
with the ground. Three examples are presented as follows:
lsensor tilted upwards: α positive
lstraight sensor: α = 0
lsensor tilted downwards: α negative
20 LBK System| Instruction manual v1.2 FEB 2019 |LBK-System_instructions_en v1.2|© 2018-2019 Inxpect SpA