SICK WSU 26/2, WEU 26/2 Technical Description

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WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

ECHNICAL D ESCRIPTION

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

The information contained in this document may be revised or supplemented without prior notice.

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Contents

1 Document Information .................................................................................................. 5

1.1 About this document ..................................................................................................... 5

1.2 Target group .......................................................................................................................5

1.3 Scope of information ....................................................................................................6

1.4 Symbols used in this document ............................................................................6

2 Safety....................................................................................................................................... 7

2.1 General safety advice and protective measures........................................ 7

2.2 Application areas ............................................................................................................. 8

2.3 Intended use of the device ...................................................................................... 9

2.4 Environmental compatibilty ....................................................................................... 9

3 Product Description..................................................................................................... 10

3.1 Characteristics................................................................................................................ 10

3.2 Device functionality..................................................................................................... 10

4 Mounting ............................................................................................................................ 11

4.1 Positioning the sensors ........................................................................................... 11

4.2 Safety distance.............................................................................................................. 11

4.3 Distance to reflective surfaces........................................................................... 13

4.4 Multiple safeguarding ................................................................................................ 15

4.4.1 Mutual interference ................................................................................................. 16

4.5 Mechanical mounting.................................................................................................. 16

4.5.1 Corner mirrors ............................................................................................................. 18

5 Electrical Installation................................................................................................. 19

5.1 Test instructions............................................................................................................ 20

5.2 Spark suppression....................................................................................................... 20

5.3 Short-circuit monitoring............................................................................................. 21

5.4 Overvoltage protection (fuse)............................................................................... 21

5.5 Wiring diagram ................................................................................................................ 22

5.6 Alignment of WSU and WEU ................................................................................... 30

5.6.1 Alignment of WSU and WEU with Alignment Aid AR 60.................... 31

6 Test Instructions ............................................................................................................ 32

6.1 Pre-commissioning tests ......................................................................................... 32

6.2 Regular testing of the safety device by competent personnel...... 32

6.3 Daily testing of the safety module by competent personnel .......... 33

7 Maintenance .................................................................................................................... 34

8 Diagnostic Elements ................................................................................................... 35

9 Technical Data ............................................................................................................... 36

9.1 Overview technical data ........................................................................................... 36

9.2 Dimensional drawings ................................................................................................ 38

10 At a glance: Comparison of old versus new devices............................ 42

11 Selection Table ............................................................................................................ 43

11.1 Conversion list ............................................................................................................. 44

12 Accessories Selection Table ............................................................................... 45

13 Checklist .......................................................................................................................... 46

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Document Information

Abbreviations

Chapter 1

PDM

WSU

WEU

OSSD

AOPD

Power-driven machinery (machinery, plant)

Photoelectric Safety Switch: Sender unit

Photoelectric Safety Switch: Receiver unit

Output Signal Switching Device

Active Optoelectronic Protective Device

1 Document Information

1.1 About this document

This document provides instructions for the operation of the WSU/WEU photoelectric safety switch. It contains information on

 Application  Mounting  Electrical installation  Commissioning  Maintenance  Ordering

1.2 Target group

The target group of this document is those who install, commission and use the WSU/WEU photoelectric safety switch.

Chapter 1

Document Information

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

1.3 Scope of information

This technical description contains information on how to install, commission and operate the device. Official and legal regulations must always be observed. It is not possible to provide comprehensive information on all these requirements in this document. In Germany, for example, the Trade Association Directives (ZH 1/597 and ZH 1/281) in particular must be observed.

Further information on health and safety with respect to optoelectronic guarding systems can be obtained directly from your local SICK distributor, e. g. Safe Machines (SICK guidelines on the operation of optoelectronic guarding systems).

1.4 Symbols used in this document

Some information in this document is highlighted to ease rapid access to this information:

Note

Explanation

Recommendation

WARNING

A note provides information on special features of the device.

An explanation gives basic information.

A recommendation assists in deciding upon the best action.

Warning!

A warning indicates actual or potential hazards. This is to reduce the risk of accidents.

Always read warning notices carefully and follow them closely.

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Safety

Chapter 2

Safety

WARNING

The devices can only perform their safety function if they are used correctly and integrated into the process in a failsafe manner.

The WSU/WEU photoelectric safety switch meets the requirements of Type 4 Safety Devices as stipulated in EN 61 496-1 and pr EN 50 100-2.

2.1 General safety advice and protective measures

1 National and international regulations apply for the operation of non-

contact protection equipment as well as for commissioning and regular maintenance checks, in particular

 Machinery Safety Regulation 98/37 EC  Provision and Use of Work Equipment Regulations

89/665 EEC

 Relevant safety regulations  Accident prevention regulations and safety guidelines

It is the responsibility of the manufacturers and operators of the machine on which SICK protection equipment is used to discuss all safety legislation, which may apply, with the responsible authorities and to observe these rules and regulations.

2 Furthermore, our notes, in particular the Test Regulations (see

section ‘Tests’) in this Technical Description or the Operating Instructions (such as use, assembly, installation or integration in the machine control unit) must be observed.

3 The tests must be performed by qualified personell or by specially

authorised and instructed personnel and must be documented in

such a way as to be viewed and understood at any time.

4 These Operating Instructions shall be given to the employee

(operator) working with the machine on which SICK guarding systems are installed. The employee shall be trained for their job and operation of the equipment by a competent person.

5 The Test Protocol relating to use of the non-contact safety device is

printed at the end of these Technical Description. Acceptance testing should be performed on the basis of that protocol.

6 Mounting and connection may only be done by qualified personnel.

Before commissioning, the mounting and connection must be inspected by the operator’s responsible staff member, as is required by the standards and directives of the specific country.

Chapter 2

Safety

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

2.2 Application areas

The WSU/WEU 26/2 photoelectric safety switch is used as an access safety system to hazardous areas around machinery or plant. The device is securely mounted in the access area at a pre-determined safe distance from the hazardous point. When the light beam is interrupted the device transmits an emergency stop signal to the machinery or plant.

Point-of-operation

Mechanical

mechanische Absicherung

guarding

Gefahrstelle

Zugangssicherung

Entry/exit guarding

mit WSU/WEU

with WSU/WEU

Direction of entry

Eintrittsrichtung

into hazardous

in Gefahrbereich

area

Fig. 1: Entry/exit safeguarding using a WSU/WEU 26/2

The following key points are important for correct operation (Fig. 2):

Beam diameter

Lichtstrahldurchmesser

23 mm

WSU WEU

23 mm

0.5 to 18 m 15 to 70 m

Fig. 2: System construction of the WSU/WEU 26/2

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Safety

Chapter 2

2.3 Intended use of the device

The WSU/WEU photoelectric safety switch may only be used as specified in Section 2.2 Application areas. The device may be operated only in accordance with its technical specifications. Any other use or modification – including during mounting and installation – will invalidate any guarantee and any claim against SICK AG.

2.4 Environmental compatibility

The WSU/WEU photoelectric safety switch is designed to have the lowest possible impact on the environment. It neither emits nor contains any environmentally damaging substances, and consumes minimal quantities of energy and resources.

Disposal

Unusable systems or systems beyond repair must be disposed of in accordance with the regulations on refuse disposal currently valid in the respective country.

The aluminium housing should be recycled. If possible, remove the plastic front panel.

All electronic components can be simply dismantled. They should be disposed of as special waste. SICK AG will not accept back unusable systems or systems beyond repair.

When dismantling and disposing of components, provisions relating to occupational safety, the environment and disposal should be observed.

Chapter 3

Product Description

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Product Description

3.1 Characteristics

Special characteristics of the WSU/WEU 26/2 photoelectric safety switch are:

 easy installation  universal functionality  solid construction  various connecton options  universal power supply  wide scanning range

3.2 How the device functions

The housing of WSU/WEU consists of die-cast Aluminium. In the WSU, an infrared sender diode emits pulse modulated light (Fig. 3). If the light path is uninterrupted the output relays in the WEU are deenergized.

3 4

5 6

11 1 10

1 Connection for power supply 2 Power supply 3 Clock generator 4 Sender diode 5 LED, WSU 6 LED, WEU

Fig. 3: Principle of function of the WSU/WEU 26/2, AC version

Light beam

Lichtbündel

10 Outputs 11 Test contact

7 Photoelectric converter 8 Amplifier 9 Relay with positively-guided contacts

7 8

Diagnostic lights on the instruments signal the various operating conditions (see 8 Diagnostic Elements). Their display, however, is not safety related. The diagnostic lights also serve as error diagnostics, see 8, Diagnostic Elements.

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Mounting

Chapter 4

Mounting

4.1 Positioning the sensors

The WSU/WEU can be operated in any position. Regulations regarding safety distances must be observed as well as sufficient height of beams above floor.

4.2 Safety distance

The WSU/WEU must be mounted such that, if the light beam is broken during hazardous movement of the machinery, the point-of-operation can only be reached when this hazardous movement has ceased. For this purpose, a safety distance S must be maintained between the nearest trapping point and the light beam (Fig. 4). The safety distance depends on the machine stopping time and on the approach speed of the personnel.

Point-of-operation

Mechanical

mechanische

guarding

Absicherung

Zugangssicherung

Entry/exit guarding

mit WSU/WEU

with WSU/WEU

Eintrittsrichtung

Direction of entry

in Gefahrbereich

into hazardous area

Fig. 4: Safety distance S to light beam

Gefahrstelle

The machine stopping time must be determined by repeated measurements under practical conditions. 1.6 m/s is the recommended (by EN 999) approach speed. The safety distance is calculated as follows:

Chapter 4

Mounting

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

S = K · T + C

S Safety distance (mm) K Approach speed 1.6 m/s T Machine stopping time (ms) + response time of WEU

(see Technical Data)

C Dependent on number of beams (1, 2, or 3), see Table 1

Table 1 shows which C value must be used for which application.

Number of beams 1 2 3

Height of beam(s) 750 400 300 above floor (mm) 900 700

C 1200 850 850

Tab 1: Height of beams above floor

1100

WARNING

Maintain safety distance!

The WSU/WEU must be mounted such that, if the light beam is broken during hazardous movement of the machinery, the point-of-operation can only be reached when the power-driven machinery is no longer in a hazardous state.

For this purpose, a safety distance must be maintained between the light beam and the nearest boundary of the point-of-operation. This safety distance is determined according to pr EN 999.

EN 999 Safety of machinery Approach speed of body parts for arrangement of protective systems

Danger of non-detection

People within the hazardous area but outside the light beam are not detected. It must, however, be ensured that any hazardous state can only be initiated when there is no one in the hazardous area.

The WSU/WEU may not be utilised as a hand- and finger protection system.

Use and mounting of the protective systems is subject to the relevant official rules and regulations. These provisions differ depending on the area of application.

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Mounting

Chapter 4

4.3 Distance to reflective surfaces

Reflective surfaces located (placed or fixed) within the sender and receiver range, may cause reflection and thus prevent an obstacle from being reliably detected (Fig. 5). For this reason, a minimum distance “a” from reflective surfaces to the optical axis (linear connection between transmitter and receiver) must be maintained (Fig. 6). The distance “a” is dependent on the distance between the sender and receiver (Fig. 7). Testing for spurious reflection is described in Section 6 Test

Instructions.

Entry direction

Central beam

Obstacle

Beam array broken

WSU WEU

Reflective object (e. g. material container)

Boundary of point-ofoperation

Deflection: “a” should be set higher because of the reflection

Fig. 5: Incorrect mounting: reflective object in divergent light beam. No detection of the obstacle due to reflection. No protection.

Entry direction

Central beam

WSU WEU

4˚

Reflective object (e. g. material container)

Boundary of point-ofoperation

Obstacle

Beam array broken

4˚

Fig. 6: Correct mounting, correctly aligned: reflective object outside divergent light beam. No reflection. The obstacle is clearly detected.

Chapter 4

Mounting

a (mm)

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

2500

2000

1500

1000

500 400 300 200 100

WSU WEU

4˚

Fig. 7: Distance “a” as a function of scanning range RW

a (18 m)

a (70 m)

RW (m)

RW I

RW II

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Mounting

Chapter 4

4.4 Multiple safeguarding

When using two WSU/WEU units in a protective system, the possibility of mutual interference must be excluded. Since the light beam of the WSU diverges, the cross-section of the beam increases as the distance between the WSU and WEU increases. The following conditions must therefore be met when arranging the WSU/WEU (Fig. 8).

Correct

Wrong

Correct

Corner mirror

Wrong

Corner mirror

Fig. 8: Safeguarding a hazardous area with WSU/WEU

Chapter 4

Mounting

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

4.4.1 Mutual interference

The transmitted light beam of the WSU must only be received by the corrsponding WEU. To prevent mutual interference between several WSU/WEU installations arranged adjacent to or above each other, the specified beam diameters must be taken into account when mounting the devices (Fig. 9), see 9 Technical Data.

WARNING

WEU

WSU

WSU WSU

WEU

WSU

WEU

Fig. 9: Mounting of two WSU/WEU units in series

There are two versions of WSU ...

... for operating ranges 0.5 - 18 m and 15 - 70 m. The WSU for 15 - 70 m must not be used for operating ranges below 15 m. The operating range is given on the information plate attached to the device.

4.5 Mechanical mounting

Note

WSU and WEU units can be mounted on one of the sides of their housing or using the mounting bracket, depending on site circumstances. The mounting bracket greatly assists alignment. The devices can be mounted in any operating orientation. However, the WSU and WEU should be mounted such that the axis of the light beam emitted by the WSU always matches the axis of the WEU optic (alignment sight).

The mounting brackets should be affixed so that all fixing screws are easily accessible for alignment purposes. Fig. 10 shows examples. The devices should be mounted such that the opposing device can be aligned using the alignment sight.

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Mounting

Chapter 4

Do not use with

WSU/WEU 26/2-xx4

Do not use with

WSU/WEU 26/2-xx4

Note

plug version

Note

plug version

Mounting bracket Part No. 2 007 900

Fig. 10: Mounting options using a mounting bracket

Chapter 4

Mounting

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

4.5.1 Corner mirrors

In conjunction with corner mirrors the WSU/WEU provides multisided, two-beam access protection (Fig. 11).

Note

The use of corner mirrors reduces the scanning range of the WSU/WEU system as indicated in the table.

The use of more than 2 mirrors (Fig. 12) requires a very accurate alignment. Use of alignment aid AR 60 is recommended.

Number of mirrors 0.5 ... 18 m WSU 15 ... 70 m WSU 1 17 m 68 m 2 15.5 m 61 m 3 13 m 51 m 4 11 m 42 m

Tab. 2: Reduction in scanning range when using corner mirrors with a = 90°

Corner mirror

Hazardous area

Corner mirror

Hazardous area

Reflection possible

Power-driven machinery (PDM)

Corner mirror

Power-driven machinery (PDM)

Safety distance too small

Umlenkspiegel

Corner mirror

Umlenkspiegel

Corner mirror

Fig. 11: Multi-sided protection of hazardous areas

Fig. 12: Two-beam protection with a WSU/WEU-26-system

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Electrical Installation

Chapter 5

Electrical Installation

Note

Depending on type, the WSU/WEU 26/2 photoelectric safety switch is available for the following supply voltages:

 24 V DC,  115 V AC or  230 V AC

The information plate gives details.

The two system components must be of the same voltage version and the same scanning range.

Before connection, check that the supply voltage and mains frequency on-site are consistent with the specifications on the information plate.

The cable is fed through the PG connector and connected inside the device, or connected to the equipment plug. The wiring diagram is depicted again on the housing cover of the respective device.

WARNING

The enclosure rating of the devices can only be guaranteed when the cable is properly clamped in the PG connector and the housing seals fit correctly. Where long leads are used, the cable cross-sections should be chosen to ensure the devices are always supplied with the required voltage (see 9 Technical Data).

Single- or fine-wire conductors up to 1.5 mm2 can be connected to the clamp terminals (to VDE 0607). Strip to length: 11 mm.

Switch off power!

The electrical connection of the WSU/WEU must only be made or changed with the power disconnected. Unscrew the housing cover to connect the WSU/WEU with a PG connector.

Use both normally-open contacts!

At least two outputs must be connected to the control unit of the machine being protected (Figs. 22/23). An electromagnetic contact element (relay) must be connected to each of the two outputs (normally-open contacts).

Chapter 5

WARNING

Electrical Installation

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Use normally-open outputs!

In new installations, both normally-open outputs must be independently supplied to two contact elements (e.g. contactors, relays). The normallyclosed output should be used only for functions that are not directly safety-related.

Explanation

In general, the normally-open contacts should be used. However, in older installations a normally-open / normally-

456789

closed combination may have been selected. This no longer conforms to presentday safety requirements. Should the WSU/WEU be installed on existing installations,

both normally-open contacts should

be connected in series to the normallyclosed contact as a second channel.

Fig. 13: Installation in old factories

5.1 Test instructions

The test function enables a check to be made on the connected contactor mechanisms. In the process, the sender is switched off when the normally-closed contact is opened. The testing functions is triggered during a minimum opening time (see 9 Technical Data). The testing function should be performed via the machinery control system in the non-hazardous phase (e. g. during a non-hazardous motion). If the test fails, the power-driven machinery — initiated via the WEU – must receive a stop signal from the machinery control system.

Use the testing function as described!

The test input must be used exclusively as described.

WARNING

5.2 Spark suppression

Spark suppressors are required when using an inductive load ...

... and must be connected in parallel to the inductive load (Fig. 14).

WARNING

Connections that are made in parallel to the output contact are not permissible, and may result in unsafe operation.

Diodes must not be used as spark-suppression elements.

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Electrical Installation

Contact

Kontakt

WEU

Supply

Betriebs- spannung

voltage

Fig. 14: Wiring for inductive contact element

WEU

Verbraucher,

User

Schütz

relay

Chapter 5

WARNING

Supply voltage Part No. R C

V WmF 115 ... 230 6 001 224 22 0 0,22 2 4 6 001 225 100 2,2

Tab. 3: Summary of spark-suppressor values

Option: plastic encapsulated; connection wires NYAF 0.5 mm Ø with spade terminals; fixing with adhesive pad or cable ties.

5.3 Short-circuit monitoring

The cables from the output contacts are not monitored by the WEU for short circuits.

Suitable measures

Suitable steps should be taken for monitoring short circuits. These could be

 Short-circuit safe (protected) routing of cables from the WEU to the

contact elements

 Screening output cables individually and connect screening to 0 V  Incorporating both contacts to differing voltage levels  Using relay(s) at the outputs where the pull in voltage must be greater

than UV /2.

5.4 Overvoltage protection (fuse)

A fuse must be provided for the control circuit. The fuse rating must correspond to the maximum current drawn by the output relay.

Chapter 5

Electrical Installation

5.5 Wiring diagram

31011

1/2

0 V

+ 24 V

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

3456789

1/2

0 V

+24 V

Technical Description

Fig. 15: Wiring diagram WSU/WEU for 24 V DC supply, with PG connector

1/2

PE L1 N

31011

3456789

1/2

L 1

Fig. 16: Wiring diagram WSU/WEU for AC supply, with PG connector

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Electrical Installation

Chapter 5

1/2

PE +24V

1/2

PE +24V

31011

WSU 26/2 -133

Equipment plug

WSU 26/2 - 131

Gerätestecker

Equipment plug

Gerätestecker

Coded to

Codiert auf E bzw. 4

E or 4

231

Coded to

Codiert au

A or

A bzw.

WSU 26/2 -233

Equipment plug

Gerätestecker

Coded to

Codiert au B bzw. 1

B or 1

3456789

1/2

PE +24V

3456789

1/2

+24V 0V

3456789

1/2

PE +24V 0V

WEU 26/2- 131

-231

Gerätestecker

Equipment plug

Coded to

Codiert au

D or 5

D bzw. 5

WEU 26/2 -132

-232

Gerätestecker

Equipment plug

Coded to

Codiert au

E or 4

E bzw. 4

WEU 26/2 -133

-233

Gerätestecker

Equipment plug

Coded to

Codiert au E bzw. 4

E or 4

Fig. 17: Wiring diagram WSU/WEU for 24 V DC supply, interchangeable design

Chapter 5

Electrical Installation

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

1/2

L 1 NPE

1/2

L 1 N

31011

WSU 26/2 -121

Gerätestecker

Equipment plug

Gerätestecker

Equipment plug

-221

-111

-211

Coded to

Codiert auf C bzw. 6

C or 6

Coded

Codiert auf

A bzw.

A or

Equipment plug

WSU 26/2 -213WSU 26/2-113

Gerätestecker

Coded to

Codiert auf G bzw. 2

G or 2

WSU 26/2-123

-223

Gerätestecker

Coded to

Codiert au

F or 3

F bzw. 3

3456789

1/2

L 1 N

1/2

3456789

PE 230/

115 V

3456789

1/2

PE 230/

115 V

WEU 26/2-122

-112

-212

-222

Gerätestecker

Equipment plug

Coded to

Codiert au F bzw. 3

F or 3

WEU 26/2 -113

-213

-123

-223

Coded to

Codiert au

Gerätestecker

A bzw.

A or

Equipment plug

WEU 26/2 -111

-211

Equipment plug

Gerätestecker

Coded to

Codiert auf

G or 2

G bzw. 2

WEU 26/2 -121

221

Gerätestecker

Equipment plug

Coded to

Codiert auf

C or 6

C bzw. 6

Fig. 18: Wiring diagram WSU/WEU for AC supply, interchangeable design

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Electrical Installation

Chapter 5

ABC

WSU 26/2 -114

+24 V/L1 (1/2)

1 2

0 V/N (3)

Test (10) Test (11)

3 4 5

(...) Terminals on electronic card

ABC

24 V / L 1 n.c. Test (1/2) (10)

0 V / N n.c. Test (3) (11)

n.c. n.c. n.c.

-214

-124

-224

-134

-234

ABC

WEU 26/2 -114

+24 V/L1 (1/2)

1 2 3 4 5

0 V/N (3)

S 1 (4)

S 1 (5)

Ö 1/2 (6)

S 2 (8) S 2 (9)

Ö1/2 (7)

(...) Terminals on electronic card

ABC

24 V / L 1 n.c. n.c. (1/2)

0 V / N n.c. n.c. (3)

n.c. n.c. n.c.

S 1 Ö 1/2 S 2

(4) (6) (8)

S 1 Ö 1/2 S 2

(5) (7) (9)

-214

-124

-224

-134

-234

Fig. 19: Pin assignment WSU/WEU 26/2, AC/DC version with equipment plug 15 P + E

Chapter 5

Electrical Installation

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

ø 28

straight

Part no. 6 006 612

Plugs and sockets must be correctly keyed. The WEU socket must not be connected to WSU plug.

PG 11

Pay attention to coding!

29.5

29,5

7.5

7,5

25,5

25.5

angled

Part no. 6 006 613

In some cases no longer complies with requirements for clearance and creepage distances (pr EN 50 178 und IEC 664); see selection table. Unsure of the meaning of this statement!

Plugs and sockets: DIN 43 651: 6 + PE with crimp contacts

PG 11

Fig. 20: Cable receptacles 6 + PE

PG 16

PG 13.5

PG 13,5

29.5

29,5

54,5

54.5

Part no. 2 019 076

Part no. 2 019 075

PG 13.5

PG 13,5

29,5

29.5

Fig. 21: Cable receptacles 15 P + PE

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

+24 V

Electrical Installation

k1 k2

)

A1 A2 PE T0PE T13T14 X11 X12 T21 T22 X21

X22

13 2 3

N.O.

Chapter 5

N.C.

N.O.

k1 k2

WSU WEU

1/2

+24V

Test

LCU-X

C1 D1 PE C2 D2 PE T3 T4 C3 D3 PE C4 D4 14 24 32

)

1/2

+24V

4 8

9 5 3

K2K1

0 V PE

) The output contacts of the receiver must be separate and screened; screens must be connected to the negative potential, so that

any cross-connection of the cables on short circuit is detected (see 5.3 Short circuit monitoring).

) Potential compensation if power supply unit 0 V is not connnected with PE (VDE 0160)

x und y Connection to the machine controller to interrupt the hazardous movement. For safety reasons, the two

independent contacts (x and y) must be inserted separately into the controller (two channel)

z If, in exceptional cases, depending on the risk assessment, the controller of the power-driven machinery is only of

a single-channel design, contact row z can be used

Fig. 22: WSU/WEU 26/2 with LCU-X safety interface

Chapter 5

max.4A

Electrical Installation

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

XY Z

WEU

WSU

k2 1x WSU/WEU26

K2 K3 K4

K 1 to K 4 Contactors or relays with positively-driven contacts (not supplied) Fu Spark-suppression, essential S Command unit, e. g. pushbutton, key-operated switch etc.

Press button S to start, otherwise red LED on WEU remains lit

x und y Insert in safe machine controller to interrupt the hazardous movement. For safety reasons, the two contact rows

(x and y) must be inserted separately into the controller (two channel)

z If, in exceptional cases, depending on the risk assessment, the controller of the power-driven machinery is only

of single-channel design, contact row z can be used

k4 k4 k4

XY Z

In this circuit example, short circuit monitoring is guaranteed by both relays K 1 (N-reference) and K 2 (L1-reference) being connected at differing voltage levels.

An opened test contact (10 - 11 on WSU) ensures that the sender does not emit and the receiver is de-activated.

Fig. 23: Example connection with a single WSU/WEU-26/2 system

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

max.4A

WEU

2 x WSU/WEU 26

Electrical Installation

WEU WSU WSU

XY Z

Chapter 5

k6 k6 k6

K 1 to K 6 Contactors or relays with positively-guided contacts (not supplied) Fu Spark-suppression required S Reset unit, e. g. pushbutton, key-operated switch etc.

Press button S to start, otherwise red LED on WEU remains lit

x und y Connection to the machine controller to interrupt the hazardous movement. For safety reasons, the two contact

lines (x and y) must be inserted separately into the controller (two channel)

z If, in exceptional cases, depending on the risk assessment, the controller of the power-driven machinery is only

of a single-channel design, contact line z can be used

In this circuit example, short circuit monitoring is guaranteed by both relays K 1 (N-reference) and K 2 (L1-reference) being connected at differing voltage levels.

An opened test contact (10 - 11 on WSU) ensures that the sender does not emit and the receiver is de-activated.

Fu Fu Fu

K2 K3 K4 K5 K6

k6 k6 k6 k6

XY Z

Fig. 24: Example connection with two WSU/WEU-26/2 systems

Chapter 5

Electrical Installation

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

5.6 Alignment of WSU and WEU

After checking the electrical connections, lossen the fixing screws on the WSU/WEU and roughly align the devices to each other using the alignment sight (Fig. 25).

Optical axis

Alignment sight

Fig. 25: Alignment with the aid of the alignment sight

If the circuit example Fig. 23 or 24 is used: For further alignment keep pressing button S or jumper terminals 10 and 11 on the WSU and switch on the device. When this is done, the LED on the WSU (yellow LED) lights up (Fig. 26).

Note

WSU

gelb

yellow

Fig. 26: LEDs of the WSU und WEU

WEU

grün gelb rot

green yellow red

Align the devices to each other so that the green LED on the WEU lights up.

For optimum alignment, determine the limits of the transmission and receiving range by pivoting the sender and receiver units horizontally and vertically. When the device leaves its respective optical range, the yellow LED on the WEU begins to flash. Then fix the sender and receiver units in the middle of the determined optical range.

The yellow LED on the WEU must be permanently lit.

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Electrical Installation

Chapter 5

5.6.1 Alignment of WSU and WEU with alignment aid AR 60

For precise alignment of the WSU and WEU the alignment aid AR 60 is available. The alignment aid is clamped on the front of the WSU and WEU respectively on a bracket (Fig. 27). The AR 60 emits a visible laser beam which exactly marks the optical axes of WSU and WEU if they are correctly mounted.

Fixing screw M4 x 10

Note

Adapter for WSU/WEU 26/2

Alignment aid AR 60

Receiver

Fig. 27: Laser alignment aid AR 60 and WSU/WEU

Incorrect alignment may mean that an obstacle is not detected or that operational safety is not achieved (Fig. 25).

Chapter 6

Test Instructions

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Test Instructions

6.1 Pre-commissioning tests

 Inspection prior to commissioning is used to confirm compliance with

 Inspection of the effectiveness of the protection equipment on the

 Qualified personnel must, prior to starting work, instruct the personnel

Note

Incorrect alignment may mean that an obstacle is not detected or that operational safety is not achieved (Fig. 25).

The light beam must not be unintentionally reflected by reflecting surfaces. Reflections can be detected as follows:

the safety requirements specified in national or international regulations, in particular the machinery safety regulations or the provision and use of work equipment regulations.

machine in all the operating modes in which the machine can be placed.

operating the machine protected by the safety device. Instruction is the responsibility of the machine operating company.

Using an object (surface: 100 x 100 mm2), break the light beam continuously and without any gaps, starting in front of the WEU and moving up to the WSU. In the process, the red diode on the WEU must illuminate continuously. If this is not the case, an inspection should be made to establish the diversion path the beam takes from the WSU to the WEU. This type of functionality check must be performed:

 daily before commencing production;  after modifying the WSU/WEU alignment;  after all maintenance and service work carried out on the protection

system.

6.2 Regular testing of the safety device by competent personnel

 Inspection should be carried out in accordance with valid national

regulations at the intervals defined in the regulations. The objective of these inspections is to detect any changes or modifications to the protection device since original commissioning.

 Inspections should also be carried out whenever major modifications

are made to the machine or protection equipment, as well as after readjustment or repairs in the event of damage occurring to housing, front lens, connecting cable, etc.

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

WARNING

Test Instructions

Chapter 6

6.3 Daily testing of the safety module by authorised personnel

Daily testing provides assurance that an effective personnel protection system is in place. It is the duty of the operator’s staff to perform testing before each working day. Inspection by fully covering the light beam: the red diode on the receiver unit must illuminate.

Inspection

If the green or yellow diodes illuminate on the WEU, then no more work may be done using the machinery. It is recommended in this case to check the system as specified in 6.1 Pre-commissioning tests.

Chapter 7

Maintenance

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Maintenance

Note

The system requires no maintenance. However, if the exit window is very dirty, a clean brush should be used to remove any dust deposits. The exit window must then be cleaned using a soft, damp cloth. The following cleaning agents are recommended:

· Non-corrosive window cleaners

· Anti-static plastic cleaners

Do not use any cleaning agents containing alcohol.

If the module has to be opened due to faulty operation, the housing must be cleaned thoroughly before opening to prevent dirt ingress. Switch the power off before doing this.

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Diagnostic Elements

Chapter 8

WSU

gelb

yellow green yellow red

Diagnostic Elements

WEU

grün gelb rot

Indicator lamp

WSU WEU Cause Inspection and rectification

yellow green yellow red

No voltage supply to WSU Check voltage Break between terminals Check connection 10 and 11 (Test contact) No voltage supply to WEU Check voltage on WEU Break on relay contact, Exchange device Relay defective Device misaligned Re-align WSU and WEU devices Front lens dirty Clean front lens of WSU

and WEU WEU receiver defective Exchange device WSU sender does not transmit Briefly switch off voltage

at WSU, then switch on (at least 1 s),

and if no function after this:

exchange WSU Device or mirror misaligned Re-align device or

mirror Front lens of WSU/WEU or Clean mirror dirty Electronics energize Switch off voltage

briefly and switch on (at least 1 s) Spurious transmitters WEU may only respond to

WSU allocated to it Defective electronics card Exchange device

LED off

LED illuminated

LED flashing LED no influence

Technical DataChapter 9

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Technical Data

9.1 Overview technical data

min. typ. max.

General system data

Protective field range 0,5 m 18 m

15 m 70 m Number of beams 1 Synchronization optical, without separate synchronization Light beam diameter in front of WSU 23 mm

divergence angle 4° Wave length of sender 950 nm Protection class 1 Enclosure rating IP 65 (connection plug)

IP 67 (PG connector) Operating mode Guard only without start and restart inhibit Supply voltage U

Frequency AC version 48 Hz 62 Hz

Ripple Voltage if power fails (20 ms) 2) 18 V On-transition time

Transmitter unit

Test output for floating switches

Test input

Power consumption

) 1.2 V

After applying the supply voltage of sender and receiver 1.8 s

Output current 10 mA

Reaction time on test 50 ms 60 ms Opening time of contact for test 75 ms Test time 150 ms

Version 24 V DC 4 W Version 115 V AC 7 VA Version 230 V AC 7 VA

19.2 V DC 24 V DC 28.8 V DC

195.5 V AC 230 V AC 253 V AC

97.75 V AC 115 V AC 126 V AC

Receiver unit

Outputs Relay max. operating frequency 0.2 Hz (1 operation in 5 s)

Response time 22 ms Current 0.02 A 2 A Voltage 24 V DC 250 V AC

Switch-on time

Power (DC/AC) 144 W / 1380 VA Mech. life expectancy (lifetime) 10 Electr. life expectancy (lifetime)

DC at 2 A current 80 x 10 AC at 2 A current 50 x 10

Normally-open contacts 10 ms Normally-closed contacts 9 ms

Reference point for measured values: equipment plug or terminals

Technical Description

Technical Data

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

min. typ. max.

Power consumption

Version 24 V DC 6 W Version 115 V AC 10 VA Version 230 V AC 10 VA

Operating data

Connection Connecting cables (PG 13.5)

Connectors Safety category Type 4 Tested to EN 61 496 part 1 and pr EN 50 100 part 2 Ambient operating temperature –25 °C +55 °C Storage temperature –25 °C +70 °C Air humidty (non-condensing) 15 % 95 % Dimensions see Dimensional Drawings Vibration resistance 5 g, 10 ... 55 Hz to IEC 68-2-6 Shock resistance 10 g, 16 ms to IEC 68-2-29 Weight

Sender unit 0.9 kg 1.3 kg Receiver unit 1.0 kg 1.4 kg

Chapter 9

) The voltage must not exceed or fall below the limit values.

) In conformity with EN 60 204, external voltage supply for the devices must be capable of sustaining a short power

interruption of 20 ms. Suitable power supplies can be obtained from SICK as accessories (Siemens Series 6 EP 1).

Chapter 9

Technical Data

9.2 Dimensional Drawings

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

156

PG 13.5

PG13,5

Fig. 28: Dimensional Drawing WSU 26/2-xx0 and WEU 26/2-xx0

M6 x 8

17.5

17,5

128

15.5

15,5

116

65 95

116

156

M6 x 8

128

15.5

15,5

65 95

Space

ca. 50

appr. 50

Freiraum

Fig. 29: Dimensional Drawing WSU 26/2-xx4 and WEU 26/2-xx4

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Technical Data

Chapter 9

156

M6 x 8

128

15,5

116

65 95 96

100

Space

min. 50

Freiraum

appr. 50

Fig. 30: Dimensional Drawing WSU 26/2-xx1 and -xx3 and WEU 26/2

-xx1, -xx2 and -xx3

Chapter 9

64.5

46.5

39.5

64.5

Mounting bracket WSU/WEU Part no. 2 007 900

Technical Data

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

M 8 x 30 SW 13

6.5

20˚

60˚

6.5

M 6

Bracket for corner mirror PSK 1 Part no. 2 009 292

16.5 33.5

ø 20

M 8 x 30 SW13

M 6

38 96

100

Corner mirror PSK 1 Part no. 1 005 229

124

149

40.5

8.5

160

177

2.5

ø 7

190

160 Miroor length

Mirror width

105

135 156

Corner mirror PNS 105-1 Part no. 1 004 076

96.5

Center of mirror surface

40.5

8.5

45˚

146.5

Corner mirror PSK 45 Part no. 5 306 053

Fig. 31: Dimensional drawing accessories

69.5

8,5

8.5

Ø 5.5

Mounting set for PSK 1 Part no. 2 012 473

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Technical Data

50.5

65.565

12.3

50.5

65.565

Chapter 9

119

Snow shield

Part no. 1 003 619

140

Dust shield

Part no. 1 003 556

11.8

Fig. 32: Dimensional drawing snow/dust shield

250

135

3.8

Spark-suppression element 110 - 220 V Part no. 6 001 224

3.8

6.3

Spark-suppression element 48 V Part no. 6 001 225

6.3

Fig. 33: Dimensional drawing spark-suppression element

Chapter 10

At a glance: old versus new

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

At a glance: Comparison of old versus new devices

This has changed:

 The optical axis of the WSU/WEU 26/2 is shifted 6 mm toward the

device connection

 There are two terminals for connection of the power supply: terminal

1/2 and terminal 3

 Voltage versions

230 V AC

115 V AC

24 V DC

 A new adapter is required for AR 60  No fiber-optic cable version is available  An additional marking on the side identifies the middle of the beam  Die Reichweiten haben sich geändert (siehe unten)  For each range segement there is a sender and a receiver  The beam diameter has changed (see below)  Connector version: the previous connector no longer complies with

requirements for clearance and creepage distances (VDE 0160 05/88 and VDE 0110)

 New front screen: may only be cleaned with plastic cleaner  The power consumption has increased (see below)

Note

Components of the (new) WSU/WEU 26/2 system cannot be combined of the (old) WSU/WEU 26 system. When exchanging in the event of repair please note that the following combinations are not possible:

WSU 26 with WEU 26/2 WSU 26/2 with WEU 26

Exchange in pairs.

WSU/WEU 26 WSU/WEU 26-2 Value

Scanning range 0.5 to 30 0.5 to 18 m

30 to 60 15 to 70 m Beam diameter 33 23 m m Power consumption

115/230 V AC 5 /7 7/10 VA 24 V DC 3/5 4/6 W

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Selection table

Chapter 11

Voltage Scanning Termination Sender unit Receiver unit

230 V AC 0.5 to 18 mPG WSU 26/2-110 1 015 615 WEU 26/2-110 1 015 616

115 V AC 0,5 to 18 mPG WSU 26/2-120 1 015 717 WEU 26/2-120 1 015 718

Selection Table

range type Type Part no. Type Part no.

Plug WSU 26/2-111 1 015 712 WEU 26/2-111 1 015 713 Plug *) WSU 26/2-113 1 015 716 WEU 26/2-113 1 015 715 Plug *) WEU 26/2-112 1 015 714 Plug 15 P + E *) WSU 26/2-114 1 015 834 WEU 26/2-114 1 015 835

15 to 70 m PG WSU 26/2-210 1 015 731 WEU 26/2-210 1 015 743

Plug WSU 26/2-211 1 015 733 WEU 26/2-211 1 015 744 Plug *) WSU 26/2-213 1 015 736 WEU 26/2-213 1 015 748 Plug *) WEU 26/2-212 1 015 746 Plug 15 P + E *) WSU 26/2-214 1 015 840 WEU 26/2-214 1 015 841

Plug WSU 26/2-121 1 015 719 WEU 26/2-121 1 015 720 Plug *) WSU 26/2-123 1 015 723 WEU 26/2-123 1 015 722 Plug *) WEU 26/2-122 1 015 721 Plug 15 P + E *) WSU 26/2-124 1 015 836 WEU 26/2-124 1 015 837

15 to 70 m PG WSU 26/2-220 1 015 738 WEU 26/2-220 1 015 749

Plug WSU 26/2-221 1 015 740 WEU 26/2-221 1 015 750 Plug *) WSU 26/2-223 1 015 737 WEU 26/2-223 1 015 505

WEU 26/2-222 1 015 751

Plug 15 P + E *) WSU 26/2-224 1 015 842 WEU 26/2-224 1 015 843

24 V DC 0,5 to 18 m PG WSU 26/2-130 1 015 724 WEU 26/2-130 1 015 725

Stecker WSU 26/2-131 1 015 726 WEU 26/2-131 1 015 727 Stecker *) WSU 26/2-133 1 015 730 WEU 26/2-133 1 015 729 Stecker *) WSU 26/2-231 1 015 747 WEU 26/2-231 1 015 753 Plug *) WSU 26/2-233 1 015 739 WEU 26/2-233 1 015 755 Plug *) WEU 26/2-232 1 015 754 Plug 15 P + E *) WSU 26/2-234 1 015 844 WEU 26/2-234 1 015 845

*) See electrical wiring diagram

Selection of plug variant WSU/WEU

Since 1989 VDE 0160 05/88 and VDE 0110 have stipulated doubled

WARNING

clearance and creepage distances. In the following cases the necessary clearance and creepage distance of the 6 PE Hirschmann connecting plug on the WEU are not met:

Supply voltage Voltage at WEU Remarks WEU output relays

230 V AC 230 V AC Only in case of separated

circuits/phases 230 V AC 24 V DC – 24 V DC 230 V AC –

In order to meet the VDE requirements for clearance and creepage distances in theses cases, the square 15-pin + PE plug must be used.

Chapter 11

Selection Table

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

11.1 Conversion list

WSU to be New type 26/2 replaced Scanning range 0.5 to 18 m Scanning range 15 to 70 m

WSU 26-110 WSU 26/2-110 1 015 615 WSU 26/2-210 1 015 731

WSU 26-111 WSU 26/2-111 1 015 712 WSU 26/2-211 1 015 733 WSU 26-112 WSU 26/2-113 1 015 716 WSU 26/2-213 1 015 736 WSU 26-120 WSU 26/2-120 1 015 717 WSU 26/2-220 1 015 738 WSU 26-121 WSU 26/2-121 1 015 719 WSU 26/2-221 1 015 740 WSU 26-130 WSU 26/2-130 1 015 724 WSU 26/2-230 1 015 745

old

WSU 26-131 WSU 26/2-131 1 015 726 WSU 26/2-231 1 015 747 WSU 26-132 WSU 26/2-133 1 015 730 WSU 26/2-233 1 015 739 WSU 26-210 WSU 26/2-210 1 015 731 WSU 26-211 WSU 26/2-211 1 015 733 WSU 26-212 WSU 26/2-213 1 015 736 WSU 26-220 WSU 26/2-220 1 015 738 WSU 26-221 WSU 26/2-221 1 015 740 WSU 26-230 WSU 26/2-230 1 015 745 WSU 26-231 WSU 26/2-231 1 015 747 WSU 26-232 WSU 26/2-233 1 015 739

Technical Description

WEU to be New type 26/2 replaced Scanning range 0.5 to 18 m Scanning range 15 to 70 m

WEU 26-710 WEU 26/2-110 1 015 616 WEU 26/2-210 1 015 743 WEU 26-712 WEU 26/2-112 1 015 713 WEU 26/2-211 1 015 744 WEU 26-713 WEU 26/2-113 1 015 715 WEU 26/2-213 1 015 748 WEU 26-720 WEU 26/2-120 1 015 718 WEU 26/2-220 1 015 749 WEU 26-730 WEU 26/2-130 1 015 725 WEU 26/2-230 1 015 504

old

WEU 26-731 WEU 26/2-131 1 015 727 WEU 26/2-231 1 015 753 WEU 26-732 WEU 26/2-132 1 015 728 WEU 26/2-232 1 015 754 WEU 26-733 WEU 26/2-133 1 015 729 WEU 26/2-233 1 015 755

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Selection Table Accessories

Chapter 12

Selection Table Accessories

Description Part no.

Alignment aid AR 60, complete 1 015 741 Adapter for alignment aid AR 60 4 031 156 Mounting bracket for WSU/WEU 2 007 900 Corner mirror PSK 1, for scanning range 0.5 to 18 m 1 005 229 Mounting set for PSK 1 2 012 473 Hinged bracket for corner mirror PSK 1 (1 piece) 2 009 292 Corner mirror PNS 105-1,

for scanning range 15 to 70 m 1 004 076 Corner mirror PSK 45 5 306 053 Cable receptacle, straight, 6 + PE (plastic) 6 006 612 Cable receptacle, angled (plastic) 6 006 613

Cable receptacle 15 P + E, lateral cable outlet,

PG 16 2 019 076 Cable receptacle 15 P + E, lateral cable outlet,

PG 13.5 2 019 075

Spark-suppression element RC-A

0,22 mF + 220 W (115 to 230 V) 6 001 224 Spark-suppression element RC-AD

2,2 mF + 100 W (24 V) 6 001 225

Switching amplifier LCU-X 24 V DC 1 013 410

PG-cable gland PG 21 5 305 978 for use of 2 cables with PNOZ 8

PG extension PG 13.5 to PG 21 5 306 052 for use of 2 cables with PNOZ 8

Dust shield 1 003 556 Snow shield 1 003 619

Chapter 13

Checklist

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

Maßbilder Spiegel

Checklist

Checklist for machine manufacturer/installer for the

installation of Electro Sensitive Protective Equipment (ESPE)

Dependent upon the application, the checks listed below are a minimum when placing an ESPE into operation for the first time.

For reference purposes the list should be retained or stored with the machine documents.

1. Are the relevant safety standards incorporated into the machine build?

Will they satisfy the Regulations? Yes  No 

2. Are the standards listed in the Declaration of Conformity? Yes  No 

3. Is the ESPE the correct type and interfaced to the correct category? Yes  No 

4. Is access to the danger zone/point of danger only possible through

the ESPE? Yes  No 

5. Are measures in place to prevent standing between the ESPE and

the danger zone? If so, are these measures secured against removal? Yes l No 

6. Has the overall machine stopping time been checked and

documented? Yes  No 

7. Is the resultant safety distance observed between the danger point

and the ESPE? Yes  No 

8. Is the ESPE correctly fixed and secured against movement after

setting in its fixed position? Yes  No 

9. Are the required protection measures against electric shock in place? Yes  No 

10. Is the re-set/re-start switch for the ESPE installed and fitted to the

correct standard? Yes  No 

11. Are the OSSDs of the ESPE connected in accordance with the machine

circuit diagram? Yes  No 

12. Have the protective functions been inspected in accordance with the

inspection instructions of this document? Yes  No 

13. Are the protective functions effective in every setting of the operating

mode switch? Yes  No 

14. Are the switching elements controlled by the ESPE, e. g. contactors,

valves monitored? Yes  No 

15. Is the ESPE effective during the entire hazardous state? Yes  No 

16. Is the hazardous state ended when the ESPE is switched on or off, as well as upon changing operation modes or on switching over to

another protective device? Yes  No 

17. Is the Daily Check Requirement sign positioned in a place visible to

the operator? Yes  No 

This checklist does not replace the initial commissioning of regular inspections by qualified personnel.

Technical Description

WSU 26/2 – WEU 26/2

Photoelectric Safety Switch

8 008 692/23-07-01 · KW/KF · Printed in Germany (03.02)

Subject to change without prior notice GB 8.02 TB

SICK AG · Industrial Safety Systems · P.O. Box 310 · 79177 Waldkirch · Deutschland

Phone +49 76 81 2 02 0 · Fax +49 76 81 2 02 38 15 · www.sick.de

Your contacts:

A ustralia

Phone +61 3 94 9741 00

008 33 48 02 – toll free

Fax +61 3 94971187

A ustria

Phone +43 2 23 66 22 88-0 Fax +43 2 23 66 22 88-5

Belgium/Luxembourg

Phone +32 24 66 55 66 Fax +32 24 63 31 04

Brazil

Phone +55 11 55 6126 83 Fax +55 11 55 35 41 53

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Phone +8 52 27 63 69 66 Fax +8 52 2763 6311

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Phone +42 02 578 10 561 Fax +42 02 578 10 559

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Phone +45 45 82 64 00 Fax +45 45 82 64 01

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Phone +3 58 9-728 85 00 Fax +3 58 9-72 88 5055

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Phone +33 1 64 62 35 00 Fax +33 1 64 62 35 77

Germany

Phone +49 2 11 53 01 0 Fax +49 2 11 53 01 100

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Phone +44 17 27-83 11 21 Fax +44 17 27-85 67 67

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Phone +31 30 229 25 44 Fax +31 30 229 39 94

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Phone +46 8 6 80 64 50 Fax +46 8 7 10 18 75

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Phone +41 4 16 19 29 39 Fax +41 4 16192921

Taiwan

Phone +88 62 23 65 62 92 Fax +88 62 23 68 73 97

USA

Phone +1(952) 9 41-67 80 Fax+1(952) 9 41-92 87

Representatives and agencies in all major industrial nations.

SICK WSU 26/2, WEU 26/2 Technical Description

Specifications and Main Features

Frequently Asked Questions

User Manual