Schmersal SLC 210 Manuale di programmazione

SLC 210 / SLG 210

PHOTOELECTRIC

SAFETY

BARRIER

SLC 210 / SLG 210

MOUNTING AND WIRING INSTRUCTIONS

TABLE OF CONTENTS

INTRODUCTION........................................................................................................................2

OPERATION..............................................................................................................................3

INSTALLATION..........................................................................................................................4

POSITIONING......................................................................................................................5

SAFETY DISTANCE CALCULATION ....................................................................................6

VERTICAL POSITION OF THE BARRIER .............................................................................7

HORIZONTAL POSITION OF THE BARRIER........................................................................8

ELECTRICAL CONNECTIONS .............................................................................................9

MULTIPLE SYSTEMS ........................................................................................................12

DISTANCE BETWEEN REFLECTING SURFACES..............................................................12

USE OF DEFLECTION MIRRORS ......................................................................................14

MECHANICAL ASSEMBLY AND OPTIC ALIGNMENT.........................................................15

OPERATION AND TECHNICAL DATA...................................................................................16

SIGNALS ...........................................................................................................................16

TEST FUNCTION...............................................................................................................17

OUTPUTS STATUS ...........................................................................................................17

TECHNICAL SPECIFICATIONS..........................................................................................18

DIMENSIONS ..........................................................................................................................19

CHECKS AND MAINTENANCE..............................................................................................21

TROUBLESHOOTING........................................................................................................22

SPARE PARTS........................................................................................................................23

SLC 210 / SLG 210

+This symbol indicates a very important warning concerning the safety of persons. Its

non-observance can cause a very serious risk for the exposed personnel.

INTRODUCTION

The SLC 210 / SLG 210 photoelectric barrier is an optoelectronic safety system. It belongs to

the family of Type 2 electrosensitive devices according to EN 954-1.

The SLC 210 / SLG 210 barrier, which consists of an Emitter and a Receiver, is a type 2

optoelectronic safety device according to standards IEC 61496-1 and IEC 61496-2.

SLC 210 / SLG 210 is available in two different families of models depending on the

maximum working range : 6 m (standard model) and 16 m (models witch the extension “–L”).

The two safe semiconductor outputs enable the barrier to be connected to the SCR 1R

safety modules, to a safety PLC or to another control system that satisfies the specific

requirements and safety level of the application.

SLC 210 / SLG 210 is ideal for protecting:

Machinery for product handling such as conveyors, palletizing, collating machines;

packaging and wrapping devices; automated assembly lines; automated warehousing.

+If necessary, contact the competent safety authorities in the country of use for any

safety-related problems questions.

+For applications in the food industry, please contact the manufacturer to ensure that

the barrier contains materials that are compatible with the chemical agents utilized.

The protective function of the optoelectronic devices is not effective in the following cases:

+If the machine stopping control cannot be actuated electrically and if it is not

possible to stop all dangerous machine movements immediately and at any time

during the operating cycle.

+If the machine generates dangerous situations due to material being expelled or

falling from overhead.

SLC 210 / SLG 210

OPERATION

If the protected area is clear, the two outputs on the Receiver are active.

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 the outputs.

+The resolution is the minimum dimensions that an object must have to intercept at

least one of the optical beams generated by the barrier (Figure 1).

Figure 1

The resolution is constant irrespectively of work conditions, as it only depends on the

geometric characteristics of the lenses and the distance between the centres of two adjacent

lenses.

The height of the protected area is the height that is actually protected by the safety

barrier. If the latter is placed horizontally, this value refers to the depth of the protected area.

The working range is the maximum operative distance that can exist between the Emitter

and the Receiver.

SLC 210 / SLG 210 is available with the following resolutions:

– 20 mm (protected height from 160 mm to 1800 mm)

PROTECTION OF FINGERS

– 40 mm (protected height from 310 mm to 1800 mm)

PROTECTION OF HANDS

– 90 mm (protected height from 460 mm to 1800 mm)

PROTECTION OF BODY

SLG 210 is the Multibeam configuration with the following lens pitch:

– 500 mm (2 beams), 400 mm (3 beams), 300 mm (4 beams)

PROTECTION OF BODY

P = Pitch between two lenses

D = Diameter of one lens

R = Resolution

SLC 210 / SLG 210

INSTALLATION

Before installing the SLC 210 / SLG 210 safety system, make sure that:

+The safety system is only used as a stopping device and not as a machine control

device.

+The machine control can be actuated electrically.

+All dangerous machine movements can be interrupted immediately. In particular, the

machine stopping times must be known and, if necessary, measured.

+The machine does not generate dangerous situations due to materials projecting or

falling from overhead; if that is not the case, additional mechanical guards must be

installed.

+The minimum dimensions of the object that must be intercepted are greater than or

equal to the resolution of the specific model.

The general instructions set out below must be taken into consideration before placing the

safety device in position.

+Make sure that the temperature of the environment in which the system is to be

installed is compatible with the temperature parameters contained in the technical

data sheet.

+Do not install the Emitter and Receiver close to bright light sources.

+Certain environmental conditions may affect the monitoring capacity of the

photoelectric devices. In order to assure correct operation of equipment in places

that may be subject to fog, rain, smoke or dust, the appropriate correction factors Cf

should be applied to the maximum working range values. In these cases:

where Pu and Pm are, respectively, the working and maximum range in meters (see

following table).

Pu = Pm x Cf

SLC 210 / SLG 210

The recommended Cf factors are shown in the table below:

ENVIRONMENTAL CONDITION CORRECTION FACTOR Cf

Fog 0.25

Steam 0.50

Dust 0.50

Dense fumes 0.25

+If the device is installed in places that are subject to sudden changes in temperature,

the appropriate precautions must be taken in order to prevent the formation of

condensation on the lenses, which could have an adverse effect on monitoring.

POSITIONING

The position of the Emitter and the Receiver must prevent access to the danger zone unless

at least one of the optical beams has been intercepted. Some useful information regarding

the correct position of the barrier is shown in the figure below.

Incorrect positioning of barrier

Correct positioning of barrier

Figure 2

SLC 210 / SLG 210

SAFETY DISTANCE CALCULATION

The barrier must be installed at a distance that is greater than or equal to the minimum

safety distance S, so that a dangerous point can only be reached after all hazardous

machine movements have stopped (Figure 3).

According to European standard EN999, the minimum safety distance Smust be calculated

using the following formula:

S = K (t1+ t2+ t3) + C

where:

Symbol Meaning Unit

Sminimum safety distance mm

Kapproach speed of object to the dangerous area mm/sec

t1response time of the safety barrier in seconds sec

t2response time of the safety interface in seconds

(e.g. PLC or safety module*) sec

t3machine response time, in seconds, meaning the time

required for the machine to interrupt the dangerous movement

following transmission of the stop signal sec

cadditional distance mm

* t2SCR 1R <20 msec (refer to the technical manual of each single safety module, if different

from SCR 1R).

+The non-observance of the correct safety distance reduces or cancels the protective

action of the light curtain.

+If the position of the barrier does not prevent the operator from having access to the

dangerous area without being detected, additional mechanical guards must be

installed to complete the system.

“S” = Safety distance

Figure 3

HAZARDOUS

MACHINE

SLC 210 / SLG 210

VERTICAL POSITION OF THE BARRIER

20 mm resolution models

+These models are suitable for the protection of

fingers.

S = K (t1+ t2+ t3) + C and S >100 mm

40 mm resolution models

+These models are suitable for the protection of

hands.

The minimum safety distance S

is calculated

according to the following formula:

S = K (t1+ t2+ t3) + C

If S <500 mm, then K = 2000 mm / sec

If S > 500 mm, then K = 1600 mm / sec

C = 8 (D -14); (D = resolution)

If, due to the specific configuration of the machine,

he dangerous area can be accessed from above,

the highest beam of the barrier must be at a height

Hof at least 1800 mm from the base G

of the

machine. S >150 mm

Figure 4

90 mm resolution models

+These models are suitable for the protection of

arms or legs and must not be used to protect

fingers or hands.

The minimum safety distance S

is calculated

according to the following formula:

S = K (t1+ t2+ t3) + C

K = 1600 mm/sec

C = 850 mm

èThe height Hof the highest beam from the

base Gmust never be less than 900 mm,

while the height of the lowest beam P

must never be more than 300 mm.

Figure 5

safety barrier

point of

danger

direction

approach

reference plane

safety barrier

point of

danger

direction

approach

reference plane

SLC 210 / SLG 210

Multibeam Models

+These models are suitable for the protection of

the entire body and must not be used to protect

arms or legs.

The minimum safety distance S

is calculated

according to the following formula:

S = K (t1+ t2+ t3) + C

K = 1600 mm/sec

C = 850 mm

èThe recommended height Hfrom the base

(G) must be the following:

Figure 6

MODEL BEAMS Recommended Height H (mm)

SLG 210-E/R0500-02-12(-H)

SLG 210-E/R0800-03-12(-H)

SLG 210-E/R0900-04-12(-H)

400 –900

300 –700 –1100

300 –600 –900 -1200

HORIZONTAL POSITION OF THE BARRIER

When the object’s directi

on of approach is parallel to

the floor of the protected area, the barrier must be

installed so that the distance between the outer limit

of the dangerous area and the most external optical

beam is greater than or equal to the minimum safety

distance Scalculated as follows:

S = K (t1+ t2+ t3) + C

K = 1600 mm/sec

C = 1200 –0.4 H (but > 850 mm)

where H is the height of the protected surface from

the base of the machine;

H = 15 (D -50) (D = resolution)

In this case, Hmust be greater than 75 mm and

less than 1000 mm.

Figure 7

safety barrier

point of

danger

direction

of approach

reference plane

safety

barrier

point of

danger

direction

approach

reference plane

SLC 210 / SLG 210

ELECTRICALCONNECTIONS

WARNINGS

Before making the electrical connections, make sure that the supply voltage complies with

the one specified in the technical data sheet.

+Emitter and Receiver units must be supplied with PELV type 24 VDC ± 20% power

supply (e.g. by means of an insulating transformer according to EN 60724).

The external power supply must comply with EN 60204 (it can bridge short-term

mains failures of up to 20 msec).

SLC 210 / SLG 210

Connector pins

Figure 8

EMITTER

NUMBER NAME MEANING

124 VDC Power supply (positive)

2 TEST -Operation without TEST (+24 VDC)

-TEST control (Transition +24 VDC -> 0 VDC

or open circuit)

30 VDC Power supply (negative)

4N.C. N.C.

5PE Ground connection

Table 1

+If the TEST function is not required by the application, connect pin 2 of the emitter

to +24 VDC.

RECEIVER

NUMBER NAME MEANING

124 VDC Power supply (positive)

2 OSSD1 Semiconductor output No. 1 (PNP active high)

30 VDC Power supply (negative)

4 OSSD2 Semiconductor output No. 2 (PNP active high)

5PE Ground connection

Table 2

EMITTER RECEIVER

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