SICK WSU 26/2 Parts list manual

WSU 26/2 – WEU 26/2
Photoelectric Safety Switch
TECHNICAL DESCRIPTION

8 008 692/23-07-01 © SICK AG • Industrial Safety Systems • Germany • All rights reserved
2
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.

8 008 692/23-07-01 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 3
Technical Description
WSU 26/2 – WEU 26/2
Photoelectric Safety Switch
Contents
Contents
1Document 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
2Safety....................................................................................................................................... 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
3Product Description..................................................................................................... 10
3.1 Characteristics................................................................................................................ 10
3.2 Device functionality..................................................................................................... 10
4Mounting ............................................................................................................................ 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
5Electrical 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
6Test 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
7Maintenance .................................................................................................................... 34
8Diagnostic Elements ................................................................................................... 35
9Technical 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

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Technical Description
WSU 26/2 – WEU 26/2
Photoelectric Safety Switch

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Technical Description
WSU 26/2 – WEU 26/2
Photoelectric Safety Switch
Abbreviations
Power-driven machinery (machinery, plant)
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
Ordering
1.2 Target group
The target group of this document is those who install, commission and
use the WSU/WEU photoelectric safety switch.
DocumentInformation Chapter 1
PDM
WSU
WEU
OSSD
AOPD
1Document Information

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6
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:
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.
DocumentInformation
Chapter 1
Note
Explanation
Recommendation
WARNING

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Technical Description
WSU 26/2 – WEU 26/2
Photoelectric Safety Switch
Chapter 2
Safety
2 Safety
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
1National 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.
2Furthermore, 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.
3The 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.
4These 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.
5The 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.
6Mounting 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.
WARNING

8 008 692/23-07-01 © SICK AG • Industrial Safety Systems • Germany • All rights reserved
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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.
Chapter 2Safety
RW
Lichtstrahldurchmesser
23 mm
WSU WEU
0.5 to 18 m
15 to 70 m
Fig. 2: System construction of the WSU/WEU 26/2
Fig. 1: Entry/exit safeguarding using a WSU/WEU 26/2
mechanische
Absicherung
Gefahrstelle
Zugangssicherung
mit WSU/WEU
Eintrittsrichtung
in Gefahrbereich
The following key points are important for correct operation (Fig. 2):
Mechanical
guarding
Point-of-operation
Entry/exitguarding
with WSU/WEU
Directionofentry
intohazardous
area
Beam diameter
23 mm

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Technical Description
WSU 26/2 – WEU 26/2
Photoelectric Safety Switch
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.
Safety Chapter 2

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Technical Description
WSU 26/2 – WEU 26/2
Photoelectric Safety Switch
Product Description
Chapter 3
3 Product Description
Fig. 3: Principle of function of the WSU/WEU 26/2, AC version
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 de-
energized.
1 Connection for power supply
2 Power supply
3 Clock generator
4 Sender diode
5 LED, WSU
6 LED, WEU
7 Photoelectric converter
8 Amplifier
9 Relay with positively-guided contacts
10 Outputs
11 Test contact
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.
11 110
9
7 8
5 6
2
3 4
2
1
Lichtbündel
Light beam

8 008 692/23-07-01 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 11
Technical Description
WSU 26/2 – WEU 26/2
Photoelectric Safety Switch
Mounting Chapter 4
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.
4 Mounting
Fig. 4: Safety distance S to light beam
The machine stopping time must be determined by repeated measure-
ments under practical conditions. 1.6 m/s is the recommended (by
EN 999) approach speed.
The safety distance is calculated as follows:
mechanische
Absicherung
Gefahrstelle
S
Zugangssicherung
mit WSU/WEU
Eintrittsrichtung
in Gefahrbereich
Point-of-operation
Mechanical
guarding
Entry/exitguarding
with WSU/WEU
Directionofentry
intohazardous
area

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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.
Mounting
Chapter 4
Number of beams 1 2 3
Height of beam(s) 750 400 300
above floor (mm) 900 700
1100
C 1200 850 850
Tab 1: Height of beams above floor
WARNING
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.

8 008 692/23-07-01 © SICK AG • Industrial Safety Systems • Germany • All rights reserved 13
Technical Description
WSU 26/2 – WEU 26/2
Photoelectric Safety Switch
WSU WEU
a
4
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.
Fig. 6: Correct mounting, correctly aligned: reflective object outside divergent
light beam. No reflection. The obstacle is clearly detected.
Fig. 5: Incorrect mounting: reflective object in divergent light beam. No
detection of the obstacle due to reflection. No protection.
Chapter 4
Mounting
WSU WEU
a
4˚
4˚
Central beam
Entry direction
Obstacle
Central beam
Entry direction Beam array
broken
Reflective object
(e. g. material container)
Boundary of
point-of-
operation
Obstacle
Beam array
broken
Deflection: “a” should be set higher
because of the reflection
Reflective object
(e. g. material container)
Boundary of
point-of-
operation

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Technical Description
WSU 26/2 – WEU 26/2
Photoelectric Safety Switch
Fig. 7: Distance “a” as a function of scanning range RW
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˚ 4˚
a
a
a (70 m)
a (18 m)
RW (m)
RW I
RW II
Chapter 4Mounting

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Technical Description
WSU 26/2 – WEU 26/2
Photoelectric Safety Switch
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).
Mounting Chapter 4
Fig. 8: Safeguarding a hazardous area with WSU/WEU
Correct
Correct
Wrong
Wrong
Corner mirror
Corner mirror

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Technical Description
WSU 26/2 – WEU 26/2
Photoelectric Safety Switch
Fig. 9: Mounting of two WSU/WEU units in series
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.
Chapter 4
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
WSU and WEU units can be mounted on one of the sides of their hou-
sing 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.
Note
Mounting
WEU WEU
WEU
WEU
WEU
WEU
WSU WSU
WSU
WSU
WSU
WSU
WARNING

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Technical Description
WSU 26/2 – WEU 26/2
Photoelectric Safety Switch
Mounting Chapter 4
Mounting bracket
Part No. 2 007 900
Fig. 10: Mounting options using a mounting bracket
Note
Do not use with
plug version
WSU/WEU 26/2-xx4
Note
Do not use with
plug version
WSU/WEU 26/2-xx4

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Technical Description
WSU 26/2 – WEU 26/2
Photoelectric Safety Switch
Mounting
Chapter 4
4.5.1 Corner mirrors
In conjunction with corner mirrors the WSU/WEU provides multisided,
two-beam access protection (Fig. 11).
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 align-
ment. Use of alignment aid AR 60 is recommended.
Note
Note
Fig. 11: Multi-sided protection of
hazardous areas
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°
Fig. 12: Two-beam protection with a
WSU/WEU-26-system
Umlenkspiegel
Umlenkspiegel
Corner mirror
Corner mirror Corner mirror
Hazardous area
Hazardous area
Corner mirror
Corner mirror
Power-driven
machinery (PDM)
Power-driven
machinery
(PDM)
Safety
distance too
small
Reflection
possible

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Technical Description
WSU 26/2 – WEU 26/2
Photoelectric Safety Switch
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.
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 mm2can 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).
Electrical Installation Chapter 5
5 Electrical Installation
Note
WARNING
WARNING

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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 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
installations a normally-open / normally-
closed combination may have been selected.
This no longer conforms to present-
day safety requirements. Should the
WSU/WEU be installed on existing installations,
both normally-open contacts should
be connected in series to the normally-
closed contact as a second channel.
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.
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).
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.
Electrical Installation
Chapter 5
Explanation
456789
K1 K2
Fig. 13: Installation in
old factories
WARNING
WARNING
WARNING