SCHUNK SRU-plus Series User instructions

Assembly and Operating Manual
SRU-plus20 - 60
Pneumatic swivel unit
Translation of Original Operating
Manual

Imprint
2 14.00 | SRU-plus 20 - 60 | Assembly and Operating Manual | en | 389443
Imprint
Copyright:
This manual is protected by copyright. The author is SCHUNK SE & Co. KG.
All rights reserved.
Technical changes:
We reserve the right to make alterations for the purpose of technical improvement.
Document number: 389443
Version: 14.00|21/09/2023|en
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
Customer Management
Tel. [phone]
Fax [phone]
[e-mail]
Please read the operating manual in full and keep it close to the product.

Table of contents
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Table of Contents
1 General ............................................................................................. 6
1.1 About this manual............................................................................... 6
1.1.1 Presentation of Warning Labels ..................................................... 6
1.1.2 Applicable documents ................................................................. 6
1.1.3 Sizes........................................................................................ 7
1.1.4 Variants ................................................................................... 7
1.2 Warranty ........................................................................................... 7
1.3 Scope of delivery................................................................................. 7
1.3.1 Accessories pack......................................................................... 8
1.4 Accessories ........................................................................................ 9
1.4.1 Seal kit .................................................................................... 9
2 Basic safety notes ................................................................................ 12
2.1 Intended use...................................................................................... 12
2.2 Not intended use ................................................................................ 12
2.3 Constructional changes......................................................................... 12
2.4 Spare parts ........................................................................................ 12
2.5 Ambient conditions and operating conditions ........................................... 13
2.6 Personnel qualification ........................................................................ 13
2.7 Personal protective equipment .............................................................. 14
2.8 Notes on safe operation........................................................................ 14
2.9 Transport........................................................................................... 14
2.10 Malfunctions ...................................................................................... 15
2.11 Disposal ............................................................................................ 15
2.12 Fundamental dangers .......................................................................... 15
2.12.1 Protection during handling and assembly ....................................... 15
2.12.2 Protection during commissioning and operation ............................... 16
2.12.3 Protection against dangerous movements ....................................... 16
2.12.4 Protection against electric shock.................................................... 17
2.13 Notes on particular risks ....................................................................... 17
3 Technical data ..................................................................................... 19
3.1 Type key............................................................................................ 19
3.2 Basic data ......................................................................................... 20
4 Design and description .......................................................................... 21
4.1 Design .............................................................................................. 21
4.1.1 Variant with electrical feed-through (EDF) ....................................... 22
4.2 Description ........................................................................................ 22
5 Assembly............................................................................................ 23

Table of contents
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5.1 Assembling and connecting................................................................... 23
5.2 Connections ....................................................................................... 25
5.2.1 Mechanical connection................................................................ 25
5.2.2 Pneumatic connection................................................................. 29
5.2.3 Electrical connection................................................................... 31
5.3 Mounting separating sleeve................................................................... 33
5.4 Settings............................................................................................. 34
5.4.1 Adjust swivel angle..................................................................... 36
5.4.2 Adjust swiveling speed ................................................................ 38
5.4.3 Adjust absorber stroke................................................................. 40
5.4.4 Set center position ..................................................................... 42
5.4.5 Set locked center position ............................................................ 43
5.5 Installing the sensors ........................................................................... 44
5.5.1 Overview of sensors .................................................................... 44
5.5.2 Mounting MMS 22 magnetic switch................................................. 45
5.5.3 Mounting MMS 22-PI1 magnetic switch............................................ 46
5.5.4 Mounting inductive proximity switch IN 80 ...................................... 48
6 Start-up ............................................................................................ 50
6.1 Setting ranges of the variants ................................................................ 50
6.2 Base unit........................................................................................... 50
6.3 Center position ................................................................................... 51
6.4 Locked center position ......................................................................... 52
6.5 Locked center position with separate piston chambers ................................ 54
7 Troubleshooting................................................................................... 56
7.1 Product does not move smoothly to the end positions ................................ 56
7.2 Product does not travel through the rotating angle .................................... 56
7.3 Product rotates jerkily .......................................................................... 56
7.4 Product does not move......................................................................... 57
7.5 Torque is diminishing .......................................................................... 57
8 Maintenance ....................................................................................... 58
8.1 Notes................................................................................................ 58
8.2 Maintenance interval ........................................................................... 58
8.3 Lubricants/Lubrication points (basic lubrication) ........................................ 59
8.4 Inspect and set shock absorbers ............................................................. 60
8.4.1 Inspect shock absorbers............................................................... 60
8.4.2 Set shock absorber overhang ........................................................ 60
8.4.3 Shock absorber types and overlap.................................................. 61
8.5 Servicing shock absorber....................................................................... 62
8.5.1 Servicing shock absorbers (absorber variant -W) ............................... 62
8.5.2 Servicing shock absorbers (absorber variant -S) ................................ 63

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8.6 Replace shock absorber ........................................................................ 64
8.6.1 Changing shock absorbers (base unit) ............................................. 64
8.6.2 Replacing external shock absorber (locked center position) ................. 65
8.6.3 Replace internal shock absorber (locked center position) .................... 66
8.7 Disassembly and assembly .................................................................... 67
8.7.1 Dismantling and assembling rotary actuator (base unit) ..................... 67
8.7.2 Dismantle and assemble rotary actuator (center position/locked center
position) .................................................................................. 68
8.7.3 Dismantling and assembling rotary actuator (fluid feed-through)......... 69
8.7.4 Dismantling and assembling rotary actuator (EDF) ............................. 70
8.8 Assembly drawings .............................................................................. 71
8.8.1 Overview of the components ........................................................ 71
8.8.2 Basic components ...................................................................... 72
8.8.3 Fitting locked center position ....................................................... 74
8.8.4 Locating face end position adjustability 90°..................................... 74
8.8.5 Anschlagseite Endlageneinstellbarkeit 3°......................................... 74
8.8.6 Addition locked middle position.................................................... 75
8.8.7 Piston and cover basic unit .......................................................... 75
8.8.8 Addition center position .............................................................. 75
8.8.9 Overview of the components (EDF) ................................................. 76
9 Translation of the original declaration of incorporation ................................. 82
10 UKCA declaration of incorporation ............................................................ 83

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.
In addition to these instructions, the documents listed
under }1.1.2 [/6] are applicable.
NOTE: The illustrations in this manual are intended to provide a
basic understanding and may deviate from the actual version.
1.1.1 Presentation of Warning Labels
To make risks clear, the following signal words and symbols are
used for safety notes.
DANGER
Dangers 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.
CAUTION
Material damage!
Information about avoiding material damage.
1.1.2 Applicable documents
lGeneral terms of business *
lCatalog data sheet of the purchased product *
The documents labeled with an asterisk (*) can be downloaded
from schunk.com.

General
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1.1.3 Sizes
This operating manual applies to the following sizes:
lSRU-plus 20
lSRU-plus 25
lSRU-plus 30
lSRU-plus 35
lSRU-plus 40
lSRU-plus 50
lSRU-plus 60
1.1.4 Variants
This operating manual applies to the following variations:
lSRU-plus
lSRU-plus rotating angle 90°
lSRU-plus rotating angle 180°
lSRU-plus end position adjustability 3°
lSRU-plus end position adjustability 90°
lSRU-plus with fluid feed-through
lSRU-plus with pneumatic center position (M)
lSRU-plus with locked center position (VM)
lSRU-plus with electrical feed-through (EDF)
lSRU-plus ATEX (EX)
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:
lObserve the specified maintenance and lubrication intervals
lObserve 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
lPneumatic swivel unit SRU-plus in the version ordered
lAssembly and Operating Manual
lAccessory pack

General
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1.3.1 Accessories pack
SRU-plus ID number
without fluid feed-through
20 5514981
25 5514981
30 5518653
35 5514989
40 5514993
50 5514997
60 5515001
with fluid feed-through
20 5514982
25 5514982
30 5518654
35 5514990
40 5514994
50 5514998
60 5515002
with center position
20 5516590
25 5516590
30 5518657
35 5516594
40 5516596
50 5516598
60 5516600
with locked center position
20 5514983
25 5514983
30 5518655
35 5514991
40 5514995
50 5514999
60 5515003
with fluid feed-through and center position
20 5516591
25 5516591

General
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SRU-plus ID number
30 5518658
35 5516595
40 5516597
50 5516599
60 5516601
with fluid feed-through and locked center position
20 5514984
25 5514984
30 5518656
35 5514992
40 5514996
50 5515000
60 5515004
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
SRU-plus ID number
Basic sealing kit
20 0371000
25 0371004
30 5518598
35 0371008
40 0371012
50 0371016
60 0371020
with center position
20 5519788
25 5519792
30 5519798
35 5519800
40 5519804
50 5519808
60 5519812

General
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SRU-plus ID number
with locked center position
20 5519789
25 5519793
30 5519799
35 5519801
40 5519805
50 5519809
60 5519813
with fluid feed-through
20 0371003
25 0371007
30 5518599
35 0371011
40 0371015
50 0371019
60 0371023
with fluid feed-through and center position
20 5519790
25 5519794
30 5519796
35 5519802
40 5519806
50 5519810
60 5519814
with fluid feed-through and locked center position
20 5519791
25 5519795
30 5519797
35 5519803
40 5519807
50 5519811
60 5519815
with EDF SRU-plus ID number
Basic sealing kit
20 5521583
25 5521583

General
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SRU-plus ID number
30 5521585
35 5521587
40 5521589
50 5521591
60 5521591
Basic sealing kit + monitoring set
20 5521584
25 5521584
30 5521586
35 5521588
40 5521590
50 5521592
60 5521592

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.
lThe product may only be used within the scope of its technical
data, }3 [/19].
lWhen 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.
lThe product is intended for installation in a machine/
automated system. The applicable guidelines for the machine/
automated system must be observed and complied with.
lThe product is intended for industrial and industry-oriented
use.
lAppropriate use of the product includes compliance with all
instructions in this manual.
2.2 Not intended use
Inappropriate use includes using the product as a cutting tool or
drilling tool, for example.
lAny utilization that exceeds or differs from the appropriate
use is regarded as misuse.
2.3 Constructional changes
Implementation of structural changes
Modifications, changes or reworking, e.g.additional threads,
holes, or safety devices, can damage the product or impair its
functionality or safety.
lStructural 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.
lUse 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.
lMake sure that the product is used only in the context of its
defined application parameters, }3 [/19].
lMake sure that the product is a sufficient size for the
application.
lMake 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.
lAll work may only be performed by qualified personnel.
lBefore working with the product, the personnel must have
read and understood the complete assembly and operating
manual.
lObserve 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.
lWhen working on and with the product, observe the
occupational health and safety regulations and wear the
required personal protective equipment.
lObserve the valid safety and accident prevention regulations.
lWear protective gloves to guard against sharp edges and
corners or rough surfaces.
l
Wear heat-resistant protective gloves when handling hot surfaces.
lWear protective gloves and safety goggles when handling
hazardous substances.
lWear 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.
lAvoid any manner of working that may interfere with the
function and operational safety of the product.
lUse the product as intended.
lObserve the safety notes and assembly instructions.
l
Do not expose the product to any corrosive media. This does not
apply to products that are designed for special environments.
lEliminate any malfunction immediately.
lObserve the care and maintenance instructions.
lObserve 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.
lWhen handling heavy weights, use lifting equipment to lift
the product and transport it by appropriate means.
lSecure the product against falling during transportation and
handling.
lStand clear of suspended loads.

Basic safety notes
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2.10 Malfunctions
Behavior in case of malfunctions
lImmediately remove the product from operation and report
the malfunction to the responsible departments/persons.
lOrder appropriately trained personnel to rectify the
malfunction.
lDo not recommission the product until the malfunction has
been rectified.
lTest 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.
lFollow local regulations on dispatching product components
for recycling or proper disposal.
2.12 Fundamental dangers
General
lObserve safety distances.
lNever deactivate safety devices.
lBefore commissioning the product, take appropriate
protective measures to secure the danger zone.
lDisconnect power sources before installation, modification,
maintenance, or calibration. Ensure that no residual energy
remains in the system.
l
If the energy supply is connected, do not move any parts by hand.
lDo 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 may impair the product's safety
and cause serious injuries and considerable material damage.
lHave all work carried out by appropriately qualified
personnel.
lFor all work, secure the product against accidental operation.
lObserve the relevant accident prevention rules.
lUse suitable assembly and transport equipment and take
precautions to prevent jamming and crushing.

Basic safety notes
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Incorrect lifting of loads
Falling loads may cause serious injuries and even death.
lStand clear of suspended loads and do not step into their
swiveling range.
lNever move loads without supervision.
lDo not leave suspended loads unattended.
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.
lTake appropriate protective measures to secure the danger
zone.
lNever 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.
lSwitch off the energy supply, ensure that no residual energy
remains and secure against inadvertent reactivation.
lNever 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.
lTo 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.

Basic safety notes
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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.
lThe operator must ensure that all components and assembly
groups are included in the local potential equalisation in
accordance with the applicable regulations.
lWhile 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.
lThe effectiveness of the potential equalisation must be
verified by executing regular safety measurements.
2.13 Notes on particular risks
DANGER
Risk of fatal injury from suspended loads!
Falling loads can cause serious injuries and even death.
lStand clear of suspended loads and do not step within their
swiveling range.
lNever move loads without supervision.
lDo not leave suspended loads unattended.
lWear 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.
l
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.
lBefore starting any work on the product: Switch off the power
supply and secure against restarting.
lMake sure, that no residual energy remains in the system.

Basic safety notes
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WARNING
Risk of injury from sharp edges and corners!
Sharp edges and corners can cause cuts.
lUse suitable protective equipment.
WARNING
Risk of burns through contact with hot surfaces!
Surfaces of components can heat up severely during operation.
Skin contact with hot surfaces causes severe burns to the skin.
lFor all work in the vicinity of hot surfaces, wear safety gloves.
lBefore carrying out any work, make sure that all surfaces
have cooled down to the ambient temperature.
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.
lRegularly 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.
lThe operator must define suitable emergency stop and
restarting strategies.
ðEmergency stop strategies: e.g. by means of controlled
shut down
ðRestarting strategies: e.g. using pressure build-up valves
or suitable valve switching sequences

Technical data
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3 Technical data
3.1 Type key
SRU-plus 20 -W-180 -3 -M - 4 -EX-M8 -AS
Size
20 25 30
35 40 50
60
Damping type
S = speed
W = soft
H = hard
Swivel angle
90°
180°
End position adjustability
3°
90°
Center position
– = none
M = pneumatic
VM = locked
Fluid feed-through
– = none
4 = 4 lines for the sizes 20 – 35
8 = 8 lines for the sizes 40 – 63
Explosion-protected variant
– = none
EX
Electrical feed-through
– = none
M5 = M5 plug on rotation side
M8 = M8 plug on rotation side
M12 = M12 plug on rotation side
Attachment kit inductive proximity switch
– = none
AS
Type key

Technical data
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3.2 Basic data
DANGER
Danger of explosion in potentially explosive areas!
lObserve supplementary sheet for products with explosion-
resistant versions "SRU-plus -...-EX".
Designation Value
Noise emission [dB(A)] ≤70
Pressure medium Compressed air, compressed air
quality according to ISO
8573-1:2010 [7:4:4]
Min. pressure [bar] 4
Max. pressure [bar] 8
Max. pressure [bar]
(Variant with locked center
position)
6.5
Tab.: Basic data
EDF Designation Value
Max. voltage [V] 24
Max. current per wire [A] 1
Maximum transmission rate
Profibus [MBaud] 1.5
Tab.: Basic data EDF
The catalog data sheet contains diagrams for designing the
maximum permissible mass moment of inertia.
The SCHUNK contact person provides support for designing further
applications.
More technical data is included in the catalog data sheet.
Whichever is the latest version.