Micro Detectors LS4 Series Manuel utilisateur

LS4 SAFETY LIGHT CURTAIN

CAT8ELS1251403 • 26/06/2018

English

LS4 SAFETY LIGHT CURTAIN

SUMMARY

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Models!with!14,!20mm!resolution!..............................................................................................................................!13!

Models!with!30,!40mm!resolution!..............................................................................................................................!13!

Models!with!50,!90mm!resolution!..............................................................................................................................!13!

Multibeam!Models!..............................................................................................................................................................!14!

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Layout!of!the!connectors!on!MASTER/SLAVE!light!curtain!.............................................................................!15!

Emitter!connections!..........................................................................................................................................................!16!

Receiver!connections!........................................................................................................................................................!17!

Warnings!regarding!connection!cables!.....................................................................................................................!18!

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Automatic!operation!..........................................................................................................................................................!19!

Manual!operation!................................................................................................................................................................!19!

Connection!of!external!contactors!K1!and!K2!........................................................................................................!20!

Examples!of!connection!with!M.D.!safety!modules!..............................................................................................!21!

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Emitter!light!signals!...........................................................................................................................................................!24!

Receiver!light!signals!.........................................................................................................................................................!24!

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LS4 SAFETY LIGHT CURTAIN

2 CAT8ELS1251403 • 26/06/2018

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ABBREVIATIONS AND SYMBOLS USED IN THIS MANUAL

FE = Functional earth (earth connection)

M/S = Master/Slave System

OSSD = Output Signal Switching Device = Light curtain’s solid state safety outputs

TX = Safety light curtain emitter.

RX = 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 personal safety. Failure to comply

with this warning may result in high level risk for exposed personnel.

èThis symbol indicates an important warning.

LS4 SAFETY LIGHT CURTAIN

CAT8ELS1251403 • 26/06/2018 3

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INTRODUCTION

The LS4 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 LS4 is available in three different versions:

1. LS4

Type 4 light curtain consisting of Emitter plus Receiver with automatic reset.

2. LS4 (With integrated control functions)

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.

3. LS4 (MASTER/SLAVE)

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 LS4 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.

LS4 SAFETY LIGHT CURTAIN

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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).

èResolution 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.

The height of the protected area 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.

The working range indicates how far the emitter and receiver can be separated and function

properly.

LS4 is available with the following resolutions:

•14mm (protected heights from 160mm to 1960mm): PROTECTION OF THE FINGERS.

•20mm (protected heights from 160mm to 1960mm): PROTECTION OF THE FINGERS.

•30mm (protected heights from 160mm to 2260mm): PROTECTION OF THE HANDS.

•40mm (protected heights from 310mm to 2260mm): PROTECTION OF THE HANDS.

•50mm and 90mm (protected heights from 310mm to 2260mm):

PROTECTION OF THE LIMBS.

The LS4 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

Receiver

Emitter

Beam

LS4 SAFETY LIGHT CURTAIN

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INSTALLATION

Before installing the LS4 safety system, check all the conditions listed below:

!The level of protection of LS4 (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.

OPERATING CONDITIONS

CORRECTION FACTOR Cf

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.

Pu = Pm x Cf

LS4 SAFETY LIGHT CURTAIN

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Positioning

The Emitter LS4Eand the Receiver LS4Rmust 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

LS4 SAFETY LIGHT CURTAIN

CAT8ELS1251403 • 26/06/2018 7

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Master/Slave Positioning

In addition to standard models (that can be positioned either horizontally or vertically), LS4 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

SLAVE

SLAVE2

SLAVE

LS4 SAFETY LIGHT CURTAIN

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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 Sso 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 Smust be

calculated using the following formula :

S = K (t1 + t2) + C

C = 8 (d-14)

where:

Minimum safety distance

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

Resolution

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

1For further information on additional safety distance, refer to EN13855:2010.

DANGEROUS ZONE

LS4 SAFETY LIGHT CURTAIN

CAT8ELS1251403 • 26/06/2018 9

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Multiple systems

When several LS4 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

èThis precaution is not necessary in the case of MASTER/SLAVE systems.

Systems installed side by side: A

Adjacent positioning of the two emitters

Systems installed one above the other: B

“L” installation: C

Crossed positioning between emitters and

receivers

LS4 SAFETY LIGHT CURTAIN

10 CAT8ELS1251403 • 26/06/2018

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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 S

(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 entire shape of the

Emitter is visible on the first mirror.

•It is advisable not to use more than three deflecting mirrors.

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