Reer EOS4 Series Quick start guide

PHOTOELECTRIC
SAFETY BARRIER
EOS4
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www.reer.it

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Positioning ...................................................................................................... 6
Master/Slave Positioning.................................................................................. 7
Calculation of safety distance .......................................................................... 8
Multiple systems ............................................................................................. 9
Use of deflecting mirrors ............................................................................... 10
Distance from reflective surfaces ................................................................... 11
Mechanical assembly and optical alignment ................................................... 12
Vertical positioning of the light curtain .......................................................... 13
Models with 14, 20mm resolution............................................................... 13
Models with 30, 40mm resolution............................................................... 13
Models with 50, 90mm resolution............................................................... 13
Multibeam Models ...................................................................................... 14
Horizontal positioning of the light curtain...................................................... 14
Electrical connections .................................................................................... 15
Layout of the connectors on MASTER/SLAVE light curtain ............................ 15
Emitter connections.................................................................................... 16
Receiver connections .................................................................................. 17
Warnings regarding connection cables........................................................ 18
Configuration and operating modes (Master Models / With integrated control
functions)...................................................................................................... 19
Automatic operation................................................................................... 19
Manual operation ....................................................................................... 19
Connection of external contactors K1 and K2.............................................. 20
Examples of connection with REER safety modules...................................... 21
Light signals.................................................................................................. 24
Emitter light signals ................................................................................... 24
Receiver light signals.................................................................................. 24
TEST function ................................................................................................ 25
Status of the outputs ..................................................................................... 25
Technical specifications................................................................................. 26
Dimensions ................................................................................................... 31
Checking of light curtain efficiency ................................................................ 33
Troubleshooting............................................................................................ 34
Accessories/Spares........................................................................................ 36

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Functional earth (earth connection)
Master/Slave System
Output Signal Switching Device = Light curtain’s solid state safety outputs
= Safety light curtain emitter.
= Safety light curtain receiver.
Hand protection light curtains
Arm and leg protection light curtains.
Full body protection light grids.
This symbol indicates an important warning for Failure to comply
with this warning may result in high level risk for exposed personnel.
This symbol indicates an important warning.

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INTRODUCTION
The EOS4 light curtain is an optoelectronic safety device belonging to the category of
Type 4 electro-sensitive protective equipment for the protection of personnel exposed to
risks inherent in the use of hazardous machines or plants, complying with the
EN 61496-1 and IEC 61496-2 standards. The EOS4 is available in three different versions:
Type 4 light curtain consisting of Emitter plus Receiver with automatic reset.
Type 4 light curtain consisting of Emitter plus Receiver with integration of additional
functions such as control of feedback from any external contactors and management of
manual/automatic operation.
Type 4 light curtain (with integrated control functions) comprising two (or three) TX/RX
pairs (connected in series), one of which comprising the MASTER light curtain (with
integrated functions) and one (or two) the SLAVE light curtain.
A set of indicator leds on the Emitter and Receiver provide the information needed for a
correct use of the device and for the assessment of any malfunction. The automatic fault
sensing system permits independent detection by the EOS4 light curtain of any
dangerous fault in a time equal to the light curtain response time.
For any safety problem, if necessary, consult the safety authorities of the country of
use or the competent industrial association.
For applications in the food industry, consult the manufacturer to verify compatibility
of light curtain materials with the chemical agents used.
The protection capability of optoelectronic safety devices is not effective in cases in
which:
- The machine stopping device cannot be actuated electrically and it is not possible
to stop all dangerous machine movements immediately and at any time during the
operating cycle.
- The hazardous condition is associated with the falling of objects from above or
ejection of these from the machine.
- Anomalous forms of light radiation are present (for example, use of cablelless
control devices on cranes, radiation from weld spatter, etc).
In this case additional measures may be necessary to ensure that the ESPE does not
fail to danger.

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PRINCIPLE OF OPERATION
If the protected area is clear, the two outputs on the Receiver are active and enable
the machine to which they are connected to operate normally.
Each time that an object bigger than or equal in size to the resolution of the
system intercepts the optical path of one or more beams, the Receiver deactivates
its own outputs. This condition enables hazardous machine movements to be
stopped (by means of an adequate machine emergency stop circuit).
Resolution is the smallest sized object that, passing through the protected area,
interrupts at least one of the beams generated by the light curtain (Figure 1),
causing certain intervention of the device and consequent stopping of the
hazardous movement of the machine.
Figure 1 - Resolution
Resolution remains constant regardless of working conditions as it depends only on the geometric
characteristics of the mirrors and on the centre distance between two adjacent lenses.
is the effective height protected by the safety light
curtain. If the curtain is positioned horizontally, this value indicates the depth of the
protected area.
indicates how far the emitter and receiver can be separated and
function properly.
EOS4 is available with the following resolutions:
14mm (protected heights from 160mm to 1810mm): PROTECTION OF THE FINGERS.
20mm (protected heights from 160mm to 1810mm): PROTECTION OF THE FINGERS.
30mm (protected heights from 160mm to 1810mm): PROTECTION OF THE HANDS.
40mm (protected heights from 310mm to 1810mm): PROTECTION OF THE HANDS.
50mm and 90mm (protected heights from 310mm to 1810mm):
PROTECTION OF THE LIMBS.
The EOS4 is also available in a Multibeam version with a distance between the
mirrors of:
500mm (2 beams), 400mm (3 beams), 300mm (4 beams).
PROTECTION OF THE BODY.
P = Pitch between two lenses
D = Diameter of a lens
R = Resolution = P+D
P
R
D
Receiver
Emitter
Beam

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INSTALLATION
Before installing the EOS4 safety system, check all the conditions listed below:
The level of protection of EOS4 (Type 4, SIL3, SILCL3 PLe) must be compatible with
the level of danger of the system to be protected.
The safety system is used only as a stopping device and not to control the machine.
The machine movement is actuated electrically.
All dangerous movements of the machine can be interrupted immediately. In
particular, the machine stopping times must be known and, if necessary, measured.
The machine must not generate hazards due to projection or falling of materials from
above; otherwise, additional mechanical guarding must be provided.
The smallest size object to be detected must be greater than or equal to the
resolution of the selected model.
Knowing the shape and dimensions of the dangerous area, it is possible to calculate the
width and height of the related access area :
Compare these dimensions with the maximum working range and the height of the
protected area of the model used.
Before positioning the safety device, comply with the following general indications:
Check that the temperature of the environment in which the system is installed is
compatible with the operating temperature parameters indicated on the product label
and in the technical data.
Do not position the Emitter and the Receiver close to very bright or flashing sources
of light.
Particular operating conditions may affect the sensing level of photo-electric devices.
In environments characterised by fog, rain, fumes or dust, to always guarantee
correct operation of the appliance, it is advisable to apply suitable correction factors
Cf so as to maximum working range values. In these cases:
where Pu and Pm are, respectively, the working and maximum range expressed in
metres.
The recommended correction factors CF are indicated in the table below.
Fog
0.25
Vapours
0.50
Dust
0.50
Dense fumes
0.25
Table 1 –CF correction factors
If the device is installed in environments characterised by sudden changes in
temperature, suitable precautions must be taken to prevent the formation of
condensation on the mirrors, which could impair detection capability.

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Positioning
The Emitter EOS4E and the Receiver EOS4R must be positioned so that it is
impossible to access the dangerous area from above, from below and from the
sides without intercepting one of the beams. Useful indications for correct
positioning of the light curtain are provided in the figure below.
Incorrect positioning of the light curtain
Correct positioning of the light curtain
Figure 2 - Positioning

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Master/Slave Positioning
In addition to standard models (that can be positioned either horizontally or vertically),
EOS4 can be purchased in a MASTER/SLAVE configuration. This configuration comprises
two (or three) pairs of light curtains in which the two (or three) Emitters and the two (or
three) Receivers are connected in series.
Figure 3 –Examples of Master/Slave configurations
The connection cable between the master and slave may be up to 50 metres in length.
This characteristic permits configuration of an application with two light curtains
positioned one at the front and one at the rear of the dangerous machine, with a single
connection towards the machine power and control circuits (Figure 4).
Figure 4 - Example of Master/Slave application with mechanical guards
MASTER
MASTER
SLAVE
SLAVE2
SLAVE

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Calculation of safety distance
The light curtain must be positioned at a distance equal to or greater than the minimum
safety distance so that the dangerous point can be reached only after stopping the
dangerous movement of the machine (Figure 5).
According to the EN13855:2010 European standards, the minimum safety distance
must be calculated using the following formula :
where:
Minimum safety distance
mm
Operator approach speed to the dangerous area
mm/sec
Total response time of the light curtain, in seconds
sec
Response time of the machine in seconds, i.e. the time taken by
the machine to stop the dangerous movement from the moment
in which the stop signal is transmitted
sec
Additional distance that varies according to the application1
mm
Resolution
mm
Table 2 –Safety distance
Failure to comply with the safety distance reduces or impairs the protection function
of the light curtain.
If positioning of the light curtain does not prevent the operator from accessing the
dangerous zone without being detected, additional mechanical guards must be
installed.
Figure 5 –Safety distance S
1
For further information on additional safety distance, refer to EN13855:2010.
DANGEROUS ZONE

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Multiple systems
When several EOS4 are used, precautions must be taken to prevent optical interference
between these: position the elements so that the beam of the Emitter of one system is
received only by its respective Receiver.
Figure 6 provides examples of correct positioning of two photo-electric systems. Incorrect
positioning may cause interference, with possible malfunction of the system.
Figure 6 –Multiple systems
This precaution is not necessary in the case of MASTER/SLAVE systems.
Adjacent positioning of the two emitters
Crossed positioning between emitters and
receivers

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Use of deflecting mirrors
For protection or control of areas accessible from several sides, one or more deflecting
mirrors can be used in addition to the Emitter and Receiver.
Deflecting mirrors make it possible to redirect the beams generated by the Emitter on
several sides.
Wishing to deflect the beams generated by the Emitter by 90°, the perpendicular to the
surface of the mirrors must form an angle of 45° with the direction of the beams.
An application in which two deflecting mirrors have been used for "U" shaped protection
is illustrated in the figure below.
Figure 7 –Deflecting mirrors
When using deflecting mirrors, comply with the following rules:
Position the mirrors so as to comply with the minimum safety distance
(Figure 7) on each side of access to the dangerous area.
The working distance (working range) is given by the sum of the lengths of all the
access sides to the protected area. (Note that the maximum working range
between the Emitter and Receiver is reduced by 15% for each mirror used).
In the installation phase, take care to avoid twisting along the longitudinal axis of
the mirror.
Standing close to and in axis the Receiver, check that the of the
Emitter is visible on the first mirror.
It is advisable not to use more than three deflecting mirrors.

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Distance from reflective surfaces
The presence of reflective surfaces close to the light curtain may cause occasional
reflections that prevent sensing. Referring to Figure 8, object is not detected due to
surface that, reflecting the beam, closes the optical path between the Emitter and
Receiver. Therefore, a minimum distance dmust be maintained between any
reflecting surfaces and the guarded area. The minimum distance must be
calculated according to the distance between the Emitter and Receiver and taking
into account that the angle of projection and reception is 4°.
Figure 8 - Reflective surfaces
The distance to be kept as the distance between Emitter and Receiver varies is shown
in Picture 9.
Figure 9 - Minimum distance d
After installing the system, check for any reflective surface that intercept the beams, first
of all at the centre and then close to the Emitter and Receiver. During this procedure, the
red led on the Receiver must never switch off.
d
l

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Mechanical assembly and optical alignment
The Emitter and Receiver must be installed facing each other, at a distance equal to or
less than that indicated in the technical data. Using the provided
, place the Emitter and Receiver so that they are aligned and parallel to each
other, and with the connectors facing the same side.
Perfect alignment of the Emitter and Receiver is essential for efficient functioning of the
light curtain; this operation is facilitated observing the indicator leds of the Emitter and of
Receiver.
Figure 10 –Mechanical assembly
Figure 11 –Optical alignment
Position the optical axis of the first and last beam of the Emitter on the same axis
as that of the corresponding beams on the Receiver.
Move the Emitter in order to locate the area within which the green led on the
Receiver remains on, then position the first beam of the Emitter (that close to the
indicator led) at the centre of this area.
Using this beam as pivot, with minor movements of the opposite end, establish the
free protected area condition which, in this situation, will be indicated by lighting
up of the green led on the Receiver.
Lock the Emitter and the Receiver in place.
During these operations it may be useful to check the presence of the
on the Receiver display. Upon completion of
alignment, this LED must be off.
If the Emitter and Receiver are installed in areas subject to strong vibrations,
(for the order code, see the ACCESSORIES/SPARES
paragraph) so as not to impair operation of the circuits.

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Vertical positioning of the light curtain
Models with 14, 20mm resolution
These models are suitable for fingers detection.
Models with 30, 40mm resolution
These models are suitable for hand detection.
The minimum safety distance is calculated according
to the following formula:
S = 2000 (t1+ t2) + 8(D-14)
(D=resolution)
This formula is valid for distances between 100 and
500 mm. If, according to the calculation, exceeds
500 mm, the distance can be reduced down to a
minimum of 500 mm using the following formula:
S = 1600 (t1+ t2) + 8(D-14)
If, in view of the particular configuration of the
machine, the dangerous zone can be reached from
above, the highest beam of the light curtain must be at
a height (from resting surface ) whose value is
determined by using the ISO 13855 Standard.
Figure 12 -
Vertical positioning
14mm, 20mm, 30mm, 40mm
Models with 50, 90mm resolution
These models are suitable for detecting the arm
or the leg and must not be used to detect
fingers or hands.
The minimum safety distance is determined
according to the following formula:
S = 1600 (t1+ t2) + 850
In every case the height of the highest beam
from resting surface must not be smaller
than 900 mm, while the height of the lowest
beam must not be bigger than 300 mm (ISO
13855 Standard).
Figure 13 - 50mm, 90mm
Light curtain
point of
danger
direction
of
approach
reference plane
Light curtain
point of
danger
direction
of
approach
reference plane

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Multibeam Models
These models are suitable for whole body
detection and must not be used to detect arms
or legs.
The minimum safety distance is determined
according to the following formula:
S = 1600 (t1+ t2) + 850
The recommend height H from the reference surface
(ground) is as follows (ISO 13855 Standard) :
Figure 14 - Multibeam
EOS4 2B
EOS4 3B
EOS4 4B
2
3
4
400 –900
300 –700 –1100
300 –600 –900 - 1200
Table 3 - Height H of Multibeam models
Horizontal positioning of the light curtain
When the direction of approach of the body is parallel to
the plane of the protected area, the light curtain must be
positioned so that the distance between the far end of the
dangerous area and the outermost beam is equal to or
greater than the minimum safety distance calculated as
follows:
S = 1600(t1+ t2) + 1200 –0.4H
where is the height of the protected surface from
the machine reference plane;
H = 15(D-50)
(D=resolution)
(ISO 13855 Standard)
Figure 15 - Horizontal positioning
Light grid
point of
danger
direction
of
approach
reference plane
Light curtain
point of
danger
direction
of approach
reference plane

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Electrical connections
Before making electrical connections, make sure that the mains voltage matches the one
indicated in the technical data.
The Emitter and Receiver must be powered at a 24Vdc±20% (PELV, in compliance with
the standard EN 60204-1 (Chapter 6.4)).
The electrical connections must be made according to the wiring diagrams provided in
this manual.
In particular, do not connect other devices to the connectors of the Emitter and Receiver.
To guarantee reliable operation using a diode bridge power supply unit, its output
capacity must be at least 2000F for each A absorbed.
Layout of the connectors on MASTER/SLAVE light curtain
Figure 16 - Connector layout
SLAVE primary connector
SLAVE2 secondary connector
SLAVE
SLAVE 2
SLAVE2 primary connector
MASTER secondary connector
MASTER
MASTER primary
connector

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Emitter connections
EOS4A - EOS4X (with integrated control functions) - EOS4XM (MASTER models)
M12 5-pin primary connectors.
1
Brown
INPUT
24VDC power supply
2
White
Light curtain configuration
complying with the EN61131-2 standard
(ref. Table 5)
3
Blue
0VDC power supply
4
Black
Light curtain configuration
complying with the EN61131-2 standard
(ref. Table 5)
5
Grey
Ground connection
Table 4 - M12, 5 pin
Master/Standard/with integrated control functions TX
24V
0V
Selection Range
0V
24V
Selection Range
0V
0V
Emitter in
24V
24V
Selection error
Table 5 –Range and TEST selection
For correct operation of the light curtain, pins 2 and 4 of the Emitter must be
connected as indicated in Table 5.
EOS4XS - EOS4XS2 (SLAVE/SLAVE2 models) - M12, 5-pin primary connector.
1
Brown
24VDC power supply
2
White
Communication
MASTER-SLAVE
3
Blue
0VDC power supply
4
Black
Communication
MASTER-SLAVE
5
Grey
Ground connection
Table 6 - M12, 5-pin Primary Slave TX
EOS4XM (MASTER models) –M12, 5-pin secondary connector.
EOS4XS2 (SLAVE2 models) –M12, 5-pin secondary connector.
1
Brown
24VDC power supply
2
White
Communication
MASTER-SLAVE
3
Blue
0VDC power supply
4
Black
Communication
MASTER-SLAVE
5
Grey
Ground connection
Table 7 - M12, 5-pin Secondary TX

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Receiver connections
EOS4A models - M12, 5-pin connector.
1
Brown
-
24VDC power supply
-
2
White
OUT
Static safety output 1
PNP active high
3
Blue
-
0VDC power supply
-
4
Black
OUT
Static safety output 2
PNP active high
5
Grey
-
Ground connection
-
Table 8 - M12, 5 pins Primary RX
EOS4X (models with integrated control functions) - M12, 8-pin connector.
EOS4XM (MASTER models) - M12, 8-pin primary connector.
1
White
OUTPUT
Static safety output 1
PNP active high
2
Brown
-
24VDC power supply
-
3
Green
OUTPUT
Static safety output 2
PNP active high
4
Yellow
INPUT
Feedback from external
contactors
Complying with the
EN61131-2 standard
(ref. Par. "Configuration
and operating modes"
page 19)
5
Grey
INPUT
Light curtain configuration
6
Pink
INPUT
7
Blue
-
0VDC power supply
-
8
Red
-
Ground connection
-
Table 9 - M12, 8 pins RX

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EOS4XS - EOS4XS2 (SLAVE/SLAVE2 models) - M12, 5-pin primary connectors.
1
Brown
24VDC power supply
2
White
Communication
MASTER-SLAVE
3
Blue
0VDC power supply
4
Black
Communication
MASTER-SLAVE
5
Grey
Ground connection
Table 10 - M12, 5 pins Primary Slave RX
EOS4XM (MASTER models) - M12, 5-pin Secondary Connector.
EOS4XS2 (SLAVE2 models) - M12, 5-pin Secondary Connector.
1
Brown
24VDC power supply
2
White
Communication
MASTER-SLAVE
3
Blue
0VDC power supply
4
Black
Communication
MASTER-SLAVE
5
Grey
Ground connection
Table 11 - M12, 5 pin Secondary RX
Warnings regarding connection cables
For connections with a length of more than 50m, use cables having a cross-section
of at least 1mm2.
It is good practice to keep the power supply of the light curtain separate from that
of other electric power equipment (electric motors, inverters, frequency variators)
or other sources of disturbance.
Connect the Emitter and Receiver to the ground outlet.
The connection cables must follow a different route from that of other power
cables.

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Configuration and operating modes
(Master Models / With integrated control functions)
The operating mode of the EOS4 light curtain is set by making suitable connections on
the M12 –8-pin connector of the Receiver (Table 12).
K1_K2/restart (PIN 4)
connected to : 24VDC
SEL_A (PIN 5)
connected to :
24VDC
SEL_B (PIN 6)
connected to :
0VDC
(Figure 17)
K1_K2/restart (PIN 4)
connected to : 24VDC
(via set of NC contacts of K1K2)
SEL_A (PIN 5)
connected to :
24VDC
SEL_B (PIN 6)
connected to :
0VDC
(Figure 18)
K1_K2/restart (PIN 4)
connected to : 24VDC (via RESTART
button)
SEL_A (PIN 5)
connected to :
0VDC
SEL_B (PIN 6)
connected to :
24VDC
(Figure 19)
K1_K2/restart (PIN 4)
connected to : 24VDC
(via RESTART button and set of NC
contacts of K1K2)
SEL_A (PIN 5)
connected to :
0VDC
SEL_B (PIN 6)
connected to :
24VDC
(Figure 20)
Table 12 –Setting of manual/automatic mode
Automatic operation
If the EOS4 light curtain is used in AUTOMATIC mode, it will not be equipped with a
start/restart interlock circuit. In most applications, this safety function is compulsory.
Carefully assess the risks analysis of your own application.
In this operating mode, the OSSD1 and OSSD2 safety outputs follow the status of the light
curtain :
with guarded area free, the outputs are ON.
with guarded area occupied, they are OFF.
Manual operation
Use in manual mode (start/restart interlock ON) is compulsory if the safety device
controls an opening in order to protect a dangerous area and if a person, after
passing through the opening, can remain in the dangerous area without being
detected (use as 'trip device' according to IEC 61496). Failure to comply with this
regulation may result in very serious hazards for the persons exposed.
In this operating mode, the safety outputs OSSD1 and OSSD2 are activated in a condition
of free protected area and after having received the RESTART signal via push-button or a
specific command on the K1K2/RESTART input).
Following occupation of the protected area, the outputs will be disabled. For re-activation,
repeat the sequence described above.
The RESTART command is active with transition
The duration of the command must be within
The Restart command must be installed outside the danger area in a position where
the danger area and the entire work area concerned are clearly visible.
It must not be possible to reach the control from inside the danger area.