SICK L29 Operating instructions

Brand: SICK

Model: L29

Type: Operating instructions

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OPERATING INSTRUCTIONS

L29

Single-beam photoelectric

safety switch

SICK AG • Industrial Safety Systems

Erwin-Sick-Straße 1

D-79183 Waldkirch • www.sick.com

8017291/11OT/2019-07-15 • TF_29

Printed in Germany (2019-07) • All rights re-

served • Subject to change without notice

1 About this document

Please read these operating instructions care-

fully before using, assembling, operating or

servicing the L29 single-beam photoelectric

safety switch. Pay particular attention to Chap-

ter 2 "On safety". This document is an original

document.

1.1 Purpose of this document

These operating instructions are intended to

provide instructions for technical personnel of

the machine manufacturer or operator on the

safe assembly, electrical installation, commis-

sioning, operation and maintenance of the L29

single-beam photoelectric safety switch.

In addition, for planning and using protective

devices such as the L29 single-beam photoe-

lectric safety switch, technical skills are

required that are not covered by this docu-

ment.

The official and legal regulations for operating

the L29 single-beam photoelectric safety

switch must always be adhered to.

1.2 Symbols used



Warning!

A warning indicates a specific or pote

tial hazard. This is intended to protect

you against accidents.

Read the warnings carefully and follow

them.



Sender and receiver

The symbol



designates the sender and

the symbol



the receiver.

2 On safety



Warning!

So that the protective device fulfills the

requirements for Type 2 of IEC 61496,

the

L29 single-beam photoelectric safe-

ty switch must be operated with a test

device of the UE410

-MU family.



Warning!

In addition, the safety instructions and

warnings in the documentation of the

test device connected must be followed.

2.1 Qualified safety personnel

The L29 single-beam photoelectric safety switch

may only be assembled, operated, tested, serviced

and used by qualified safety personnel.

A qualified person

• has taken part in adequate technical training

and

• has been instructed by the machine operator in

machine operation and the applicable safety

guidelines

and

• has access to these operating instructions.

2.2 Applications of the device

In conjunction with an external test device from the

UE410-MU family, the L29 single-beam photoelec-

tric safety switch is a Type 2 electro-sensitive

protective device (ESPE) in accordance with

IEC 61496-1 and IEC 61496-2. In combination they

can be used in safety applications up to Category 2

according to EN ISO 13849, SILCL1 according to

EN 62061 or up to PL c according to EN ISO

13849.

It fulfills the requirements of the Machinery Di-

rective and is for:

• Hazardous area protection

• Access protection.

The single-beam photoelectric safety switches

must be installed so that the hazardous area can

only be reached by breaking the light path be-

tween sender and receiver.

If there is somebody in the hazardous area, the

system must not be able to start.

2.3 Correct use

The L29 single-beam photoelectric safety switch

may only be used as described in Chapter 2.2

"Applications of the device".

If used in any other way or if alterations are made

to the device – including in the context of assem-

bly and installation – this will render warranty

claims directed to SICK AG void.

2.4 General safety notes and protective

measures



Safety notes!

Observe the following to ensure the safe

use of the

L29 single-beam photoelec-

tric safety switch as intended.

• The national and international legal specifica-

tions apply to the installation and use of the L29

single-beam photoelectric safety switch, to its

commissioning and to technical inspections re-

peated at regular intervals, in particular:

– Machinery Directive

– The Work Equipment Directive

– The work safety regulations and safety regula-

tions

– Any other relevant safety regulations.

• The manufacturer and operator of the machine

on which the L29 single-beam photoelectric

safety switch is used are responsible for coordi-

nating and complying with all applicable safety

specifications and regulations, in cooperation

with the relevant authorities.

• Inspection instructions for these operating in-

structions (see Chapter 6 "Commissioning")

must be strictly observed.

• The checks must be carried out by qualified

safety personnel or specially qualified and au-

thorized personnel and must be recorded and

documented to ensure that the tests can be re-

constructed and retraced at any time.

• These operating instructions must be made

available to the operator of the machine on

which the L29 single-beam photoelectric safety

switch is used. The machine operator must be

instructed by qualified safety personnel and

read the operating instructions.

2.5 Disposal

 Always dispose of unusable devices in ac-

cordance with national waste disposal

regulations.

Note

We will be glad to assist you in the disposal of

these devices. Please contact us.

3 Product description

The L29 single-beam photoelectric safety switch is

an opto-electronic sensor that works with a sender

(L29S) and a receiver unit (L29E). The L29S has a

test input (T1), with which the correct functioning

of the senders can be checked. In conjunction with

an external test device of the UE410-MU family,

this photoelectric switch is suitable for Category 2

safety requirements (EN ISO 13849), SILCL1

(EN 62061) or PL c (EN ISO 13849).

For use in other applications there is a second test

input (T2) available that, unlike T1, reacts to an in-

verted signal.

4 Mounting

4.1 Minimum distance for access

protection

A minimum distance must be maintained between

the light beams and the hazardous point. This en-

sures that the hazardous point can only be

reached if the dangerous state of the machine has

been stopped completely.

According to EN ISO 13855 and EN ISO 13857 the

minimum distance depends on:

• The stopping time of the machine or system (the

machine stopping time can be obtained from the

machine documentation or must be determined

by measurement)

• The response time of the complete protective

device

• The approach speed

• Number of beams/beam separation.



Danger of detection failure!

Persons who are in the hazardous area,

but not in the light path between sender

and receiver will not be detect

ed. It

must therefore be ensured that the m

chine can only operate in a dangerous

state if no one is in the hazardous area.

The

L29 single-beam photoelectric safe-

ty switch must not be used as hand and

finger prote

ction.



No pr

otective function without suffi-

cient minimum distance!

The mounting of the photoelectric

switches with the correct minimum di

tance to the hazardous point is a

prerequisite for effective protection. The

photoelectric switches are to be fitted

so that when

the light beam is broken,

the hazardous point can only be

reached if the dangerous state has

been eliminated.

Fig. 1: Access protection with L29single-beam

photoelectric safety switch

In accordance with EN ISO 13855 and EN ISO

13857, the minimum distance S is calculated as

follows:

Note

The following calculation diagram shows an exam-

ple calculation of the minimum distance.

Depending upon the application and the environ-

mental conditions, another calculation diagram

may be required.

 The following formula is used to perform the cal-

culation:

S = K × T + C [mm]

where

S = minimum distance [mm]

K = Approach speed 1.6 [m/s]

T = Machine stopping time + response time of the

whole protective device

C = Addition, dependent on the number of beams

(1, 2, 3 or 4) see Tab. 1.

Number of

beams

Height of the

beams above

ground [mm]

750

400

900

300

700

1100

300

600

900

1200

Addition C

[mm]

1200

850

Tab. 1: Variables for calculation of the minimum

distance

4.2 Minimum distance to reflective

surfaces

The light beams from the sender may be deflected

by reflective surfaces. This can result in persons

not being detected.

Therefore, all reflective surfaces (RS) and objects

(e.g. material bins) must be kept at a minimum

distance (a) from the single-beam photoelectric

safety switch.

Fig. 2: Minimum distance from reflective surfaces

How to determine the minimum distance from

reflective surfaces (RS):

 Measure the distance (D) [m], between sender

and receiver.

 Read the minimum distance (a) [mm] from the

diagram.

Note

The minimum distances to reflective surfaces only

apply where the light path is clear. By using trans-

parent protective screens, these distances can be

altered. Consult information given by the individual

manufacturers.



Avoid mutual inter

ference between

single

-beam photoelectric safety

switches!

If several single

-beam photoelectric

safety switches are used, the aperture

angle/receiving angle of the sensors

must be carefully taken into account to

exclude mutual interference.

5 Electrical installation



Shut down the dangerous state of the

system!

Make sure that the dangerous state of

the machine is switched off and r

mains switched off.

The single-beam photoelectric safety switch com-

plies with the rules for electromagnetic

compatibility (EMC) for the industrial sector (Radio

Safety Class A). Radio interference cannot be ruled

out when used in residential areas.

In accordance with its classification as Type 2 as

per IEC 61496, the single-beam photoelectric

safety switch may only be operated with an exter-

nal test device of the UE410-MU family. To

connect the sensors, refer to the corresponding

operating instructions for the test device or for the

higher-order control system.

The L29E receiver has complementary output sig-

nal switching devices:  = dark switching for HIGH

light interruption output; Q = light switching for

HIGH light reception output, see Fig. 3.

Fig. 3: Complementary output signal switching

device

5.1 Connection

Connector version

Plug in the female cable connector with the power

off and fasten in place, see Fig. 4.

Fig. 4: Connection type, cable with plug, 4 pin,

M12

 Connect test input T1 of the sender (4) with

output X2 of the test device (UE410-MU fam-

ily).

 Connect switching output Q of the receiver

(4) with input l2 of the test device (UE410-

MU family).

 Connect power supply as shown in the dia-

gram with contacts 1 and 3 of the sender

and receiver.

Note

For applications that do not have to conform to

the requirements of IEC 61496 for Type 2, in-

stead of the T1 test input, the T2 test input

(that reacts to an inverted signal) can be used

with another test device. The two test inputs

differ as follows:

• T1: LOW activates the test (T1 < 2 V: sender

test active = sender does not send, T1 > 5 V:

sender sends).

• T2: HIGH activates the test (T2 > 5 V: sender

test active = sender does not send, T2 < 2 V:

sender sends).



Warn

ing!

Only one test input may be operated at

any time. T1 and T2 must not be ope

ated simultaneously.

Only test input T1 may be used with an

external

test device of the UE410-MU

family.

5.2 Usage in cascade

Fig. 5: Example for L29 connection in a two

device cascade (T = test device)

6 Commissioning

6.1 Alignment of the Sensors and

LED Displays

 Fit the L29S and L29E opposite one another

using suitable brackets (e.g., SICK mounting

brackets) and approximately align them.

When doing so, consider the scanning

range, see Chapter 7 "Technical data".

 Apply operating voltage to the L29S and

L29E (see type label). Green function display

illuminates on L29S and L29E.

 Position the L29E receiver in the beam path

of the L29S sender. Align the light spot onto

the L29E, until the yellow receive indicator il-

luminates. The L29E receiver is reliably

detected. If it flashes or does not illuminate,

re-adjust, clean or check the operating con-

ditions of the single-beam photoelectric

safety switch.

6.2 Inspection instructions

Check the protective device as described below

and in accordance with the applicable standards

and regulations.

These inspections also serve to detect the effect

of interference light sources and other unusual

environmental influences on the protection.

These checks must therefore always be per-

formed.

Minimum distance S

6.2.1 Checks before initial commissioning

 Access to the hazardous area must only be

possible by interruption of the light path be-

tween the sender and the receiver.

 It should not be possible to step over the

light path between sender and receiver,

crawl beneath it, or go around it.

 Also check the effectiveness of the protec-

tive device of the machine in all operating

modes in which the machine can be set.

 Ensure that all operators have been in-

structed by the qualified safety personnel of

the machine user before they start working

on a machine protected by an L29 single-

beam photoelectric safety switch. Instruction

is the responsibility of the machine user.

 To ensure correct functioning, carry out sub-

sequent checks in accordance with Chapter

6.2.3 "Regular testing of the effectiveness of

the protective device".

6.2.2 Regular inspection of the protective

device by qualified safety personnel

 Check the system following the inspection

intervals specified in the national rules and

regulations. This procedure ensures that any

changes to the machine or tampering with

the protective device are detected after ini-

tial commissioning.

 If substantial alterations to the machine or

protective device were carried out or the

single-beam photoelectric safety switch was

modified or repaired, then re-inspect the

system in the same fashion as for initial

commissioning.

6.2.3 Regular testing of the effectiveness of

the protective device

The effectiveness of the protective device

must be checked regularly, e.g., daily or at the

beginning of work, by qualified and authorized

personnel using the correct test object.

 Cover each light beam completely with a

non-transparent test object (min. 30 mm di-

ameter) at the following positions:

– Immediately in front of the sender

– In the middle, between the sender and the

receiver (or the deflector mirrors)

– Immediately in front of the receiver

– Where deflector mirrors are used, imme-

diately in front of and behind the mirror.

This must have the following outcome:

 For as long as the light beam is interrupted,

it must not be possible to initiate the dan-

gerous state.

6.2.4 Compliance with EU directives

EU declaration of conformity (excerpt)

The undersigned, representing the following

manufacturer herewith declares that the product

is in conformity with the provisions of the follow-

ing EU directive(s) (including all applicable

amendments), and that the respective stand-

ards and/or technical specifications are taken

as the basis.

Complete EU declaration of conformity for down-

load: www.sick.com

7 Technical data

7.1 General system data

Minimum

Typical

Maximum

Scanning range

6 m

Light sender

, Light type

LED, visible red light (650 nm)

Aperture angle/receiving angle

±5°

Light beam diameter Approx. 25 mm at a distance of 1 m

Supply voltage U

at the device

2)3) 4)

19.2 V

24 V

30 V

Residual ripple

≤5 V

Current consumption sender/receiver

≤30 mA/≤30 mA

Output signal switching device (OSSD)

PNP, Q

Signal voltage HIGH (L29E)

–2.5 V

–3.2 V

Signal voltage LOW (L29E) 1 V

Output current I

(L29E)

100 mA

Response time

Power down time (on interruption/test)

540 µs

Power-up delay (light path clear/end of

test)

540 µs

Test duration

2.6 ms

Response time

10)

For one sensor pair

30 ms

For two sensor pairs

32.6 ms

For three sensor pairs

35.2 ms

For four sensor pairs

37.8 ms

Test input T1 for sender

Sender off

T1 <2 V

Sender on

T1 >5 V or not connected

Test input T2 for sender

Sender off

T2 >5 V

Sender on

T2 <2 V

Output signal (receiver only)

LOW: Light beam interrupted; HIGH light beam clear

Safety technology parameters

Type

Type 2 (IEC 61496), PDF-T (IEC 60947-5-3)

11)

Safety integrity level

12)

SIL1 (IEC 61508), SILCL1 (EN 62061)

11)

SICK L29 Operating instructions

Brand: SICK

Model: L29

Type: Operating instructions

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