SICK WSU26-2/WEU26-2 Photoelectric Safety Switch Operating instructions

S

D

DK

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FIN

GB

GR

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NL

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WSU26-2/WEU26-2

Photoelectric Safety Switch

O P E R AT I N G I N S T R U C T I O N S

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113

WSU/WEU 26/2

Notice

d'instructions

F

Homologations

Chapitre 10

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143

WSU/WEU 26/2

Operating Instructions

GB

Contents

1 Document Information 145

1.1 About this document 145

1.2 Target group 145

1.3 Scope of information 146

1.4 Symbols used in this document 146

2 Safety 147

2.1 Application areas of the device 147

2.2 Intended use of the device 149

2.3 General safety advice and protective

measures 150

2.4 Environmental compatibility 150

3 Product Description 151

3.1 System design 151

3.2 Mode of operation 151

4 Electrical Installation 152

4.1 Testing 153

4.2 Spark suppression 154

4.3 Short-circuit monitoring 155

4.4 Overvoltage protection (fuse) 155

5 Mounting 156

5.1 Safety distance 156

5.2 Distance to reflective surfaces 157

5.3 Multiple fuse protection 158

5.3.1 Interference 159

6 Commissioning 160

6.1 Alignment 160

6.2 Fault Diagnosis 161

7 Test Instructions 162

7.1 Pre-commissioning tests 162

7.2 Regular testing of the safety device by

experts 163

7.3 Daily testing of the safety device by

authorised personnel 163

8 Maintenance 165

Contents

144

WSU/WEU 26/2

Operating Instructions

9 Technical Data 166

10 Certificates of Conformity 169

11 Checklist 170

12 Appendix 339

Appendix 339

List of diagrams

1 Dimensional drawing for Models WSU 26/2-xx0 and

WEU 26/2-xx0

2 Dimensional drawing for Models WSU 26/2-xx4 and

WEU 26/2-xx4

3 Dimensional drawing for Models WSU 26/2-xx1 and

-xx3 and WEU 26/2-xx1, -xx2 and xx3

4 Connection schematic WSU 26/2-x3x (DC)

5 Connection schematic WEU 26/2-x3x (DC)

6 Connection schematic WSU 26/2-x1x, -x2x (AC)

7 Connection schematic WEU 26/2-x1x, -x2x (AC)

8 Connection schematic WSU 26/2-xx4

9 Connection schematic WEU 26/2-xx4

10 Correct and incorrect mounting of WSU/WEU with

multiple fuse protection systems

11 Mounting of two WSU/WEU in series

Contents

145

WSU/WEU 26/2

Operating Instructions

GB

Abbreviations

Power-driven tools (machine, plant)

Non-contact protection system

Photoelectric Safety Switch: Sender unit

Photoelectric Safety Switch: Receiver unit

Output Signal Switching Device

Active Optoelectronic Protective Device

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

1.2 Target group

The target group of this document is those who install, com-

mission and use the WSU/WEU Photoelectric Safety Switch.

Document Information

Chapter 1

1 Document Information

KA

BWS

WSU

WEU

OSSD

AOPD

146

WSU/WEU 26/2

Operating Instructions

1.3 Scope of information

These Operating Instructions contain information on how to in-

stall, commission and operate the device. Official and legal re-

gulations 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 Associati-

on Directives (ZH 1/597 and ZH 1/281) in particular must be

observed. Further information on health and safety and opto-

electronic protection equipment can be obtained directly from

your local SICK distributor, e. g. Safe Machines (SICK guideli-

nes on the operation of optoelectronic protection equipment).

1.4 Symbols used in this document

Some information in these Operating Instructions is highlighted

to ease rapid access to this information:

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 redu-

ce the risk of accidents.

Always read warning notices carefully and follow them closely.

Document Information

Chapter 2

Note

Explanation

Recommendation

WARNING

147

WSU/WEU 26/2

Operating Instructions

GB

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 require-

ments 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 operati-

on of non-contact protection equipment as well as for com-

missioning 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 re-

gulations.

2. Furthermore, our notes, in particular the Test Regulations

(see section ‘Tests’) in the Technical Description or these

Operating Instructions (such as use, assembly, installation

Safety

Chapter 2

2 Safety

WARNING

148

WSU/WEU 26/2

Operating Instructions

or integration in the machine control unit) must be obser-

ved.

3. The tests must be performed by qualified experts or by

specially authorised and instructed personnel and must be

documented in such a way as to be able to be viewed and

understood at any time.

4. Our Operating Instructions shall be given to the employee

(operator) working at the machine on which SICK protection

equipment is used. The employee shall be trained for his

job and operation of the equipment by an expert.

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

device is printed at the end of the English section of these

Operating Instructions. Acceptance testing is performed on

the basis of that protocol.

6. Mounting and connection may only be done by qualified

personnel. Before commissioning, the mounting and con-

nection must be inspected by the operator’s responsible

staff member, as is required by the standards and directi-

ves of the specific country.

Safety

Chapter 2

149

WSU/WEU 26/2

Operating Instructions

GB

System construction of the WSU/WEU 26/2

Entry/exit safeguarding using a WSU/WEU 26/2

The following key points are important for correct operation:

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 emergen-

cy stop signal to the machinery or plant.

Safety

Chapter 2

Point-of-operation

Mechanical

guarding

Direction of

entry into

hazardous

area

Entry/exit

guarding

with WSU/WEU

RW

WSU WEU

0,5 ... 18 m

15 ... 70 m

Beam diameter

23 mm

150

WSU/WEU 26/2

Operating Instructions

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.

Always consider the environment in everything you do at your

workplace. This also means complying with the following in-

structions concerning disposal.

Disposal

Unusable systems or systems beyond repair must be disposed

of in accordance with the regulations on refuse disposal cur-

rently valid in the respective country.

The aluminium housing must 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 ac-

cept back unusable systems or systems beyond repair.

When dismantling and disposing of components, provisions re-

lating to occupational safety, the environment and disposal

should be observed.

Safety

Chapter 2

151

WSU/WEU 26/2

Operating Instructions

GB

3.1 System design

The WSU/WEU Photoelectric Safety Switch comprises the follo-

wing components:

! WSU Sender unit

! WEU Receiver unit

3.2 Mode of Operation

The WSU/WEU 26/2 Photoelectric Safety Switch consists of

one sender unit and one receiver unit. The WSU sender unit

emits a light beam, which is picked up by the WEU receiver

unit.

An interruption in the light beam by an object causes the out-

put relay to de-energize, which stops the machine.

The sender and receiver units are equipped with LEDs for func-

tion monitoring. Their function as a diagnostic element is set

out in Section 6 Commissioning.

Indicator diodes on the device signal the various operating mo-

des (see Section 6.2 Fault Diagnosis). However, the informati-

on that they display is not relevant to safety status. The

indicator diodes also serve as error diagnostic systems (see

Section 6.2 Fault Diagnosis).

Product Description

Chapter 3

3 Product Description

152

WSU/WEU 26/2

Operating Instructions

Electrical connections must be made appropriate to device op-

tion (see Connection Schematics in the Appendix). With device-

connector options, pay attention to the coding denoted. It must

match the coding of the cable socket, thus preventing connec-

tion to an unsuitable version (other supply voltage, other ran-

ge).

Both contacts at the test input of the sender unit must be clo-

sed during operation. Testing (open for min. 75 ms and close

again) should be done with an uninterrupted light beam. This

causes the output relay to de-energize.

Switch off power!

Electrical connection of the WSU/WEU or modification may only

be carried out with power removed.

To connect the WSU/WEU with a PG thread, the housing lid

must be unscrewed.

Use both normally-open contacts!

At least two outputs must be connected to the control unit of

the machine being protected (Figs. 4, 5, 7, 9, Appendix). An

electromagnetic contact element (relay) must be connected to

each of the two outputs (normally-open contacts).

Electrical Installation

Chapter 4

4 Electrical installation

WARNING

Note

153

WSU/WEU 26/2

Operating Instructions

GB

Use normally-open outputs!

In new factories, both normally-open outputs must be indepen-

dently supplied to two contact elements (e.g. contractors, re-

lays). The normally-closed output should be used only for

functions that are not directly safety-related.

In general, the normally-open contacts

should be used. However, in older

factories a normally-open / normally-

closed combination was selected.

This no longer conforms to present-

day safety requirements. Should the

WSU/WEU be installed in old factories,

both normally-open contacts should

be connected in series to the

normally-closed contact as a second

channel.

4.1 Testing

This enables a check to be made on the contact elements con-

nected. In the process, operation of the normally-closed con-

tacts will de-activate the sender. Testing is initiated during a

minimum open time (see Section 9 Technical Data).

Testing must be undertaken via machinery control in the safe

phase (e.g. a safe movement). If the test is unsuccessful, the

power-driven machine - initiated by the WEU - will receive a de-

energize signal from the machinery control system.

Use the testing function as described!

The test input must be used exclusively as described.

456789

K1

K2

Installation in old facto-

ries

WARNING

Electrical Installation

Chapter 4

154

WSU/WEU 26/2

Operating Instructions

4.2 Spark suppression

Spark suppressors are required when using an

inductive load ...

... and must be connected in parallel to the inductive load. Con-

nections that are made in parallel to the output contact are not

permissible, and may result in unsafe operation.

Wiring for inductive contact element

Supply voltage Part No. R C

V ΩµF

115 ... 230 6 001 224 220 0,22

24 6 001 225 100 2,2

Option: plastic encapsulated; connection wires

NYAF 0.5 mm Ø with spade terminals; fixing with adhe-

sive pad or cable ties.

Summary of Spark suppressor values

Electrical Installation

Chapter 4

WARNING

C

R

Supply

voltage

User

relay

Contact

in

WEU

155

WSU/WEU 26/2

Operating Instructions

GB

4.3 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 U

V

/2.

4.4 Overvoltage protection (fuse)

A fuse must be provided for the control circuit. The fuse rating

must correspond to the maximum current draw of the output

relay.

Electrical Installation

Chapter 4

WARNING

156

WSU/WEU 26/2

Operating Instructions

Provisionally install the Photoelectric Safety Switch, coarsely

aligned. This alignment is done with the help of the sight groo-

ve on the upper section of the housing and the lateral beam

marking.

5.1 Safety distance

The WSU/WEU must be attached 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 boundary of the

Safety distance between the nearest boundary of the point-of-ope-

ration and the light beam

Mounting

Chapter 5

5 Mounting

S

Mechanical

guarding

Point-of-operation

Entry/exit

guarding

with WSU/

WEU

Direction of

entry into ha-

zardous area

157

WSU/WEU 26/2

Operating Instructions

GB

point-of-operation and the light beam (Fig.). The safety di-

stance depends on the machine stopping time and on the ap-

proach speed of the personnel.

The machine stopping time must be determined by repeated

measurements under practical conditions. 1.6 m/s is the re-

commended approach speed.

The safety distance is calculated as follows:

S Safety distance (mm)

K Approach speed 1.6 m/s

T Machine stopping time (ms) + response time of WEU

(see 9 Technical Data)

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

Number of beams 1 2 3

Height of beam(s) 750 400 300

above floor (mm) 900 700

1100

C 1200 850 850

5.2 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.

For this reason, a minimum distance "a" from reflective sur-

faces to the optical axis (linear connection between transmitter

and receiver) must be maintained (see illustration below). The

distance "a" is dependent on the distance between the sender

and receiver.

Testing for spurious reflection is described in Section 7 Test

Instructions.

S = K · T + C

Mounting

Chapter 5

158

WSU/WEU 26/2

Operating Instructions

Correct mounting, correctly aligned: reflective object outside diver-

gent light beam. No reflection. The obstacle is clearly detected

Distance "a" as a function of scanning range RW I and RW II

a (mm)

2500

2000

1500

1000

500

400

300

200

100

3

10

6

20

12

40

9

30

18

60

15

50

21

70

WSU WEU

4˚

a

a (70 m)

a (18 m)

RW (m)

RW I

RW II

5.3 Multiple units

When using two WSU/WEU in a single safeguarding application,

interference must be prevented. Because the light beam of the

WSU diverges, the light-beam cross section increases the grea-

ter the distance between the WSU and the WEU. Consequently,

WSU WEU

a

4˚

Central beam Entry direction

Beam array bro-

ken

Obstacle

Mounting

Chapter 5

Reflective object (e.

g. material container)

Point-of-

operation

boundary

159

WSU/WEU 26/2

Operating Instructions

GB

the following conditions must be observed when installing the

WSU/WEU (Fig. 10, Appendix).

5.3.1 Interference

The light beam from the WSU must be received only by the in-

tended WEU. To prevent interference from several adjacent

WSU/WEUs, the appropriate light beam diameters when moun-

ting the devices (Fig. 11, Appendix) must be taken into consi-

deration.

WSUs are available in two options ...

... for operating ranges 0.5 - 18 m and also 15 - 70 m. The

WSU for 15 - 70 m may not be used for operating ranges be-

low 15 m. The operating range is stated on the type plate.

Mounting

Chapter 5

WARNING

160

WSU/WEU 26/2

Operating Instructions

The device is switched on by connecting the supply voltage to

the sender unit and to the receiver unit. The device is ready for

operation after approx. 2 s.

For more detailed information on this, see Technical Descripti-

on WSU/WEU 26/2.

6.1 Alignment using the indicator lights

Switch on the supply. The yellow LED on the WSU should light

up.

Align the modules with each other such that the green and yel-

low LEDs on the WEU light up.

For optimum alignment, determine the limits of the transmissi-

on and receiving range by pivoting the sender and receiver

units horizontally and vertically. When the device leaves its re-

spective 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.

Commissioning

6 Commissioning

Chapter 6

WSU WEU

yellow green

red

yellow

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