SCHUNK SRU 20 Installation and operating instructions

Translation of the original manual
Assembly and operation manual
SRU 20 - 60
Pneumatic Swivel Unit

Imprint
2
13.00 | SRU 20 - 60 | Assembly and operation manual | en | 389430
Imprint
Copyright:
This manual is protected by copyright. The author is SCHUNK GmbH & Co. KG. All rights
reserved. Any reproduction, processing, distribution (making available to third parties),
translation or other usage - even excerpts - of the manual is especially prohibited and
requires our written approval.
Technical changes:
We reserve the right to make alterations for the purpose of technical improvement.
Document number: 389430
Version: 13.00|16/04/2019|en
© SCHUNK GmbH & Co. KG
All rights reserved.
Dear Customer,
thank you for trusting our products and our family-owned company, the leading
technology supplier of robots and production machines.
Our team is always available to answer any questions on this product and other solutions.
Ask us questions and challenge us. We will find a solution!
Best regards,
Your SCHUNK team
SCHUNK GmbH & Co. KG
Spann- und Greiftechnik
Bahnhofstr. 106 – 134
D-74348 Lauffen/Neckar
Tel. [phone]
Fax [phone]
[email protected]
schunk.com

Table of contents
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Table of contents
1 General.................................................................................................................... 5
1.1 About this manual ................................................................................................ 5
1.1.1 Presentation of Warning Labels ...............................................................5
1.1.2 Applicable documents ..............................................................................5
1.2 Warranty .............................................................................................................. 6
1.3 Scope of delivery .................................................................................................. 6
1.3.1 Accessories pack.......................................................................................6
1.4 Accessories ........................................................................................................... 7
1.4.1 Seal kit ......................................................................................................7
2 Basic safety notes ................................................................................................... 8
2.1 Intended use......................................................................................................... 8
2.2 Not intended use.................................................................................................. 8
2.3 Constructional changes ........................................................................................ 8
2.4 Spare parts ........................................................................................................... 8
2.5 Ambient conditions and operating conditions .....................................................9
2.6 Personnel qualification......................................................................................... 9
2.7 Personal protective equipment.......................................................................... 10
2.8 Notes on safe operation .....................................................................................10
2.9 Transport ............................................................................................................ 10
2.10 Malfunctions....................................................................................................... 11
2.11 Disposal .............................................................................................................. 11
2.12 Fundamental dangers......................................................................................... 11
2.12.1 Protection during handling and assembly ..............................................11
2.12.2 Protection during commissioning and operation ...................................12
2.12.3 Protection against dangerous movements.............................................12
2.12.4 Protection against electric shock............................................................12
2.13 Notes on particular risks..................................................................................... 13
3 Technical data.........................................................................................................15
4 Assembly and Commissioning .................................................................................16
4.1 Mechanical connection ...................................................................................... 16
4.2 Pneumatic connection........................................................................................ 18
4.3 Adjusting the end positions................................................................................ 21
4.4 Shock absorber travel - fine adjustment SRU 50 und SRU 60............................. 22
4.5 Adjusting the center position (variant M) .......................................................... 23
4.6 Adjusting the center position (variant VM) ........................................................ 24
4.7 Mounting and adjusting the sensors .................................................................. 26
4.7.1 Magnetic switch MMS 22 .......................................................................26
4.7.2 Inductive proximity switches with male thread M8 ...............................27

Table of contents
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5 Function and handling ............................................................................................29
5.1 Base unit............................................................................................................. 29
5.2 Center position (variant M) ................................................................................ 30
5.3 Locked center position (variant VM) .................................................................. 31
5.3.1 Mounting the separating sleeve.............................................................34
6 Troubleshooting .....................................................................................................35
6.1 Product does not move smoothly to the end positions .....................................35
6.2 Product does not travel through the rotating angle ..........................................35
6.3 Product rotates jerkily ........................................................................................ 35
6.4 Product does not move ...................................................................................... 36
6.5 Torque drops? .................................................................................................... 36
7 Maintenance ..........................................................................................................37
7.1 Maintenance intervals........................................................................................ 37
7.2 Lubricants/Lubrication points (basic lubrication) .............................................. 37
7.3 Dismantling the module ..................................................................................... 38
7.3.1 Dismantling the rotary actuator .............................................................38
7.3.2 Disassemble and assemble center position (variants M and VM)..........38
7.4 Replacing a shock absorber ................................................................................ 38
7.4.1 How to use the shock absorbers and installation dimensions ...............41
7.4.2 Measuring instruction ............................................................................42
7.5 Servicing the product ......................................................................................... 42
7.6 Assembly drawings ............................................................................................. 43
8 Translation of original declaration of incorporation ................................................46
9 Annex to Declaration of Incorporation....................................................................47

General
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1 General
1.1 About this manual
This manual contains important information for a safe and
appropriate use of the product.
This manual is an integral part of the product and must be kept
accessible for the personnel at all times.
Before starting work, the personnel must have read and
understood this operating manual. Prerequisite for safe working is
the observance of all safety instructions in this manual.
Illustrations in this manual are provided for basic understanding
and may differ from the actual product design.
In addition to these instructions, the documents listed under
Applicable documents [}5] are applicable.
1.1.1 Presentation of Warning Labels
To make risks clear, the following signal words and symbols are
used for safety notes.
DANGER
Danger for persons!
Non-observance will inevitably cause irreversible injury or death.
WARNING
Dangers for persons!
Non-observance can lead to irreversible injury and even death.
CAUTION
Dangers for persons!
Non-observance can cause minor injuries.
NOTICE
Material damage!
Information about avoiding material damage.
1.1.2 Applicable documents
• General terms of business*
• Catalog data sheet of the purchased product *
The documents marked with an asterisk (*) can be downloaded on
our homepage schunk.com

General
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1.2 Warranty
If the product is used as intended, the warranty is valid for 24
months from the ex-works delivery date under the following
conditions:
• Observe the specified maintenance and lubrication intervals
• Observe the ambient conditions and operating conditions
Parts touching the workpiece and wear parts are not included in
the warranty.
1.3 Scope of delivery
The scope of delivery includes
• Pneumatic Swivel Unit SRU in the version ordered
• Assembly and Operating Manual
• Accessory pack
1.3.1 Accessories pack
Id-No. Accessory pack SRU
20 25 30 35 40 50 60
Without fluid feed-through
5514981 5518653 5514989 5514993 5514997 5515001
With fluid feed-through
5514982 5518654 5514990 5514994 5514998 5515002
With center position
5516590 5518657 5516594 5516596 5516598 5516600
With locked center position
5514983 5518655 5514991 5514995 5514999 5515003
With fluid feed-through and center position
5516591 5518658 5516595 5516597 5516599 5516601
With fluid feed-through and locked center position
5514984 5518656 5514992 5514996 5515000 5515004
Content of the accessories pack: Assembly drawings [}43].

General
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1.4 Accessories
A wide range of accessories are available for this product
For information regarding which accessory articles can be used
with the corresponding product variants, see catalog data sheet.
1.4.1 Seal kit
ID.-No. of the seal kitSRU
Seal kit for
SRU 20 SRU 25 SRU 30 SRU 35 SRU 40 SRU 50 SRU 60
Basic seal kit
0371000 0371004 5518598 0371008 0371012 0371016 0371020
with center position
0371001 0371005 5518600 0371009 0371013 0371017 0371021
with locked center position
0371002 0371006 5518601 0371010 0371014 0371018 0371022
with media feed-through
0371003 0371007 5518599 0371011 0371015 0371019 0371023
with center position and media feed-through
5517804 5517805 5517806 5517807 5517808 5517809 5517810
with locked center position and media feed-through
5517811 5517812 5517813 5517814 5517815 5517816 5517817
Contents of the sealing kit, Assembly drawings [}43].

Basic safety notes
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2 Basic safety notes
2.1 Intended use
The product may only be used for swiveling permissible
attachment parts or workpieces.
• The product may only be used within the scope of its technical
data, Technical data [}15].
• When implementing and operating components in safety-
related parts of the control systems, the basic safety principles
in accordance with DIN EN ISO 13849-2 apply. The proven safety
principles in accordance with DIN EN ISO 13849-2 also apply to
categories 1, 2, 3 and 4.
• The product is intended for installation in a machine/system.
The applicable guidelines must be observed and complied with.
• The product is intended for industrial and industry-oriented use.
• Appropriate use of the product includes compliance with all
instructions in this manual.
2.2 Not intended use
• Any utilization that exceeds or differs from the appropriate use
is regarded as misuse.
Inappropriate use includes using the product as a lifting tool, tool
guide or drive tool, for example.
2.3 Constructional changes
Implementation of structural changes
By conversions, changes, and reworking, e.g. additional threads,
holes, or safety devices can impair the functioning or safety of the
product or damage it.
• Structural changes should only be made with the written
approval of SCHUNK.
2.4 Spare parts
Use of unauthorized spare parts
Using unauthorized spare parts can endanger personnel and
damage the product or cause it to malfunction.
• Use only original spare parts or spares authorized by SCHUNK.

Basic safety notes
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2.5 Ambient conditions and operating conditions
Required ambient conditions and operating conditions
Incorrect ambient and operating conditions can make the product
unsafe, leading to the risk of serious injuries, considerable material
damage and/or a significant reduction to the product's life span.
• Make sure that the product is used only in the context of its
defined application parameters, Technical data [}15].
• Make sure that the product is a sufficient size for the
application.
• Make sure that the environment is free from splash water and
vapors as well as from abrasion or processing dust. Exceptions
are products that are designed especially for contaminated
environments.
2.6 Personnel qualification
Inadequate qualifications of the personnel
If the personnel working with the product is not sufficiently
qualified, the result may be serious injuries and significant
property damage.
• All work may only be performed by qualified personnel.
• Before working with the product, the personnel must have read
and understood the complete assembly and operating manual.
• Observe the national safety regulations and rules and general
safety instructions.
The following personal qualifications are necessary for the various
activities related to the product:
Trained electrician Due to their technical training, knowledge and experience, trained
electricians are able to work on electrical systems, recognize and
avoid possible dangers and know the relevant standards and
regulations.
Qualified personnel Due to its technical training, knowledge and experience, qualified
personnel is able to perform the delegated tasks, recognize and
avoid possible dangers and knows the relevant standards and
regulations.
Instructed person Instructed persons were instructed by the operator about the
delegated tasks and possible dangers due to improper behaviour.
Service personnel of
the manufacturer
Due to its technical training, knowledge and experience, service
personnel of the manufacturer is able to perform the delegated
tasks and to recognize and avoid possible dangers.

Basic safety notes
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2.7 Personal protective equipment
Use of personal protective equipment
Personal protective equipment serves to protect staff against
danger which may interfere with their health or safety at work.
• When working on and with the product, observe the
occupational health and safety regulations and wear the
required personal protective equipment.
• Observe the valid safety and accident prevention regulations.
• Wear protective gloves to guard against sharp edges and
corners or rough surfaces.
• Wear heat-resistant protective gloves when handling hot
surfaces.
• Wear protective gloves and safety goggles when handling
hazardous substances.
• Wear close-fitting protective clothing and also wear long hair in
a hairnet when dealing with moving components.
2.8 Notes on safe operation
Incorrect handling of the personnel
Incorrect handling and assembly may impair the product's safety
and cause serious injuries and considerable material damage.
• Avoid any manner of working that may interfere with the
function and operational safety of the product.
• Use the product as intended.
• Observe the safety notes and assembly instructions.
• Do not expose the product to any corrosive media. This does
not apply to products that are designed for special
environments.
• Eliminate any malfunction immediately.
• Observe the care and maintenance instructions.
• Observe the current safety, accident prevention and
environmental protection regulations regarding the product's
application field.
2.9 Transport
Handling during transport
Incorrect handling during transport may impair the product's
safety and cause serious injuries and considerable material
damage.
• When handling heavy weights, use lifting equipment to lift the
product and transport it by appropriate means.
• Secure the product against falling during transportation and
handling.
• Stand clear of suspended loads.

Basic safety notes
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2.10 Malfunctions
Behavior in case of malfunctions
• Immediately remove the product from operation and report the
malfunction to the responsible departments/persons.
• Order appropriately trained personnel to rectify the
malfunction.
• Do not recommission the product until the malfunction has
been rectified.
• Test the product after a malfunction to establish whether it still
functions properly and no increased risks have arisen.
2.11 Disposal
Handling of disposal
The incorrect handling of disposal may impair the product's safety
and cause serious injuries as well as considerable material and
environmental harm.
• Follow local regulations on dispatching product components for
recycling or proper disposal.
2.12 Fundamental dangers
General
• Observe safety distances.
• Never deactivate safety devices.
• Before commissioning the product, take appropriate protective
measures to secure the danger zone.
• Disconnect power sources before installation, modification,
maintenance, or calibration. Ensure that no residual energy
remains in the system.
• If the energy supply is connected, do not move any parts by
hand.
• Do not reach into the open mechanism or movement area of
the product during operation.
2.12.1 Protection during handling and assembly
Incorrect handling and assembly
Incorrect handling and assembly can make the product unsafe and
pose a risk of serious injuries and considerable material damage.
• Order all work to be performed only by appropriately qualified
personnel.
• For all work, secure the product against accidental operation.
• Observe the relevant accident prevention regulations.

Basic safety notes
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2.12.2 Protection during commissioning and operation
Falling or violently ejected components
Falling and violently ejected components can cause serious injuries
and even death.
• Take appropriate protective measures to secure the danger
zone.
• Never step into the danger zone during operation.
2.12.3 Protection against dangerous movements
Unexpected movements
Residual energy in the system may cause serious injuries while
working with the product.
• Switch off the energy supply, ensure that no residual energy
remains and secure against inadvertent reactivation.
• Never rely solely on the response of the monitoring function to
avert danger. Until the installed monitors become effective, it
must be assumed that the drive movement is faulty, with its
action being dependent on the control unit and the current
operating condition of the drive. Perform maintenance work,
modifications, and attachments outside the danger zone
defined by the movement range.
• To avoid accidents and/or material damage, human access to
the movement range of the machine must be restricted. Limit/
prevent accidental access for people in this area due through
technical safety measures. The protective cover and protective
fence must be rigid enough to withstand the maximum possible
movement energy. EMERGENCY STOP switches must be easily
and quickly accessible. Before starting up the machine or
automated system, check that the EMERGENCY STOP system is
working. Prevent operation of the machine if this protective
equipment does not function correctly.
2.12.4 Protection against electric shock
Possible electrostatic energy
Components or assembly groups may become electrostatically
charged. When the electrostatic charge is touched, the discharge
may trigger a shock reaction leading to injuries.
• The operator must ensure that all components and assembly
groups are included in the local potential equalisation in
accordance with the applicable regulations.
• While paying attention to the actual conditions of the working
environment, the potential equalisation must be implemented
by a specialist electrician according to the applicable
regulations.
• The effectiveness of the potential equalisation must be verified
by executing regular safety measurements.

Basic safety notes
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2.13 Notes on particular risks
DANGER
Risk of fatal injury from suspended loads!
Falling loads can cause serious injuries and even death.
•Stand clear of suspended loads and do not step within their
swiveling range.
•Never move loads without supervision.
•Do not leave suspended loads unattended.
•Wear suitable protective equipment.
WARNING
Risk of injury from objects falling and being ejected!
Falling and ejected objects during operation can lead to serious
injury or death.
•Take appropriate protective measures to secure the danger
zone.
WARNING
Risk of injury due to unexpected movements!
If the power supply is switched on or residual energy remains in
the system, components can move unexpectedly and cause
serious injuries.
•Before starting any work on the product: Switch off the power
supply and secure against restarting.
•Make sure, that no residual energy remains in the system.
WARNING
Risk of injury from sharp edges and corners!
Sharp edges and corners can cause cuts.
•Use suitable protective equipment.
WARNING
Risk of burns through contact with hot surfaces!
The product can heat up considerably during operation. Touching
hot surfaces can cause burns.
•Do not touch hot surfaces.
•Let them cool down before working on the product.
•Wear appropriate safety equipment.

Basic safety notes
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WARNING
Risk of injury from parts coming loose!
If the shock absorbers are faulty, the product can become
damaged. Parts coming loose in this way can lead to injuries.
•Regularly check the components for wear and damage.
WARNING
Risk of injury if the condition or behavior of the product is
undefined!
Cutting off the compressed air supply in an uncontrolled manner
could lead to undefined states and behavior. This may cause
personal injury or material damage.
•The operator must define suitable emergency stop and
restarting strategies.
✓Emergency stop strategies: e.g. by means of controlled shut
down
✓Restarting strategies: e.g. using pressure build-up valves or
suitable valve switching sequences

Technical data
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3 Technical data
Basis data
Designation Value
Noise emission [dB(A)] ≤70
Pressure medium Compressed air, compressed air quality according to
ISO 8573-1:7 4 4
More technical data is included in the catalog data sheet.
Whichever is the latest version.

Assembly and Commissioning
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4 Assembly and Commissioning
4.1 Mechanical connection
WARNING
Risk of injury when the machine/system moves unexpectedly!
Switch off power supply.
Assembly The module can be mounted from the base.
Mounting possibilities
mounting material (* provided by customer/ ** included in the enclosed pack)
Item Designation SRU
20 25 30 35 40 50 60
1* Screw M6 M6 M6 M8 M8 M10 M12
2** Centering sleeve Ø12 Ø12 Ø12 Ø12 Ø14 Ø16 Ø16
Fastening
at the base
ØUse the centering sleeves from the enclosed pack.
ØSecure the module from the output side via the drill holes
provided for this purpose, or at the base using the threads.

Assembly and Commissioning
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Mount attachment parts on the pinion
The following mounting materials must be provided by customer:
mounting material (* provided by customer/ ** included in the enclosed pack)
Item Designation SRU
20 25 30 35 40 50 60
1 * Screw M6 M6 M6 M16 M8 M10 M10
2 * Screw M5 M6 M6 M6 M8 M10 M10
3 * Fitting screw M5 M5 M5 M5 M6 M8 M8
4 ** Centering
sleeve
Ø6,0 Ø6,0 Ø6,0 Ø6,0 Ø8,0 Ø10 Ø10
Pinion mounting ØUse the centering sleeves (1) from the enclosed pack.
ØFasten the attachment on the four threaded holes (2).
ØFor this, use the 2 counterbores for the centering sleeves (4).
Pinion mounting with
optional inductive
proximity switch
ØThe control cam retaining plate must be fixed with the
centering sleeves (4)
between the pinion and a customer side mounting plate.
ØAttach the mounting plate via the 4 threaded holes (2).
ØSecure attachment on the mounting plate.

Assembly and Commissioning
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4.2 Pneumatic connection
WARNING
Risk of injury when the machine/system moves unexpectedly!
Remove the energy supplies.
Make sure that no residual energy remains in the system.
NOTE
• Observe the requirements for the compressed air supply,
Technical data [}15].
• In case of compressed air loss (cutting off the energy line), the
components lose their dynamic effects and do not remain in a
secure position. However, the use of a SDV-P pressure
maintenance valve is recommended in this case in order to
maintain the dynamic effect for some time. Product variants
are also offered with mechanical gripping force via springs,
which also ensure a minimum clamping force in the event of a
pressure drop.
• Only open the air connections required.
• Seal air connections not required using
the locking screws from the enclosed pack.
• For hose-free direct connections use the two O-rings from the
enclosed pack.

Assembly and Commissioning
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Air connections, variant with center position
Ite
m
Designation Description Function
1 b Hose-free
direct connection
swiveling 90° - 0°/180° - 0°
2 a swiveling 0° - 90°/0° - 180°
3 d Approach center position (M)
Extend locking position (VM)
4 c
5 C Hose connection Approach center position (M)
Extend locking position (VM)
6 D
7 A swiveling 0° - 90°/0° - 180°
8 B swiveling 90° - 0°/180° - 0°
Pay attention to the following table when using throttles.
Air connection for
variant with
center position (M)
ØThe air connections labeled "C" and "D" must be pressurized
together (with intersection).
NOTICE
In the variant with locked center position, this can cause
malfunctions!
•Do not install an exhaust air throttle.
•Observe table Use of throttles [}20].

Assembly and Commissioning
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Air connection for
variant with
locked
center position (VM)
NOTE
The operating pressure of the lock must be between 4 and 6 bar.
ØIn addition, air connections that are marked "C" and "D"
are available Air connections, variant with center position
[}19].
ØThe
lock can be retracted smoothly using a supply air throttle. Tab.
Use of throttles [}20]
Variant with
media feed-through
ØConnections marked with numbers are provided for feed-
through of the media on the pinion and the flange.
Use of throttles
Module variant A B C D
without center
position
Exhaust air
throttle/or no
throttle
Exhaust air
throttle/or no
throttle
- -
with center position
(M)
Exhaust air
throttle/or no
throttle
Exhaust air
throttle/or no
throttle
Supply air
throttle/or
no throttle
Supply air
throttle /or
no throttle
with locked
center position (VM)
Supply air
throttle/or no
throttle
Supply air
throttle/or no
throttle
Supply air
throttle/or
no throttle/
or quick air
relief valve
Supply air
throttle/or
no throttle/
or quick air
relief valve
with locked
center position (VM)
and separate
main piston chambers
A1
Exhaust
air
throttle/
or no
throttle
A2
no
throttle!
B1
Exhaust
air
throttle/
or no
throttle
B2
no
throttle!
Supply air
throttle/or
no throttle
Supply air
throttle/or
no throttle