be certain.
m
Series 201 Actuators
Product Information
Model 201.17
Model 201.20
Model 201.25
Model 201.30
Model 201.35
Model 201.40
Model 201.45
Model 201.60
Model 201.70
Model 201.80
Model 201.90
100-145-483 C
Copyright information © 2005, 2006, 2008 MTS Systems Corporation. All rights reserved.
Trademark information MTS and Temposonics are registered trademarks of MTS Systems Corporation
within the United States. These trademarks may be protected in other countries.
Teflon is a registered trademark of DuPont.
Molykote is a registered trademark of Dow Chemical Corporation.
Publication information
Manual Part Number Publication Date
100-145-483 A
100-145-483 B
100-145-483 C March 2008
October 2005
June 2006
2
Manual Template 4.3
Contents
Technical Support 5
How to Get Technical Support 5
Before You Contact MTS 5
If You Contact MTS by Phone 6
Problem Submittal Form in MTS Manuals 7
Preface 9
Before You Begin 9
Conventions 10
Documentation Conventions 10
Introduction 13
Functional Description 13
Specifications 17
Actuator Dimensions 18
End Cap and Base Dimensions 20
Safety 25
Hazard Placard Placement 25
Installation 29
Installing the Actuator 29
Spiral Washers 30
Installing Accessories with Spiral Washers 31
Removing Accessories with Spiral Washers 33
Operation 35
Series 201 Actuator Operation 35
Optional Displacement Transducer Operation 35
Series 201 Actuator Product Information Contents
3
Maintenance 37
4
Contents
Series 201 Actuator Product Information
Technical Support
How to Get Technical Support
How to Get Technical Support
Start with your
manuals
Technical support
methods
MTS web site
www.mts.com
E-mail techsupport@mts.com
Telephone MTS Call Center 800-328-2255
Fax 952-937-4515
The manuals supplied by MTS provide most of the information you need to use
and maintain your equipment. If your equipment includes MTS software, look
for online help and README files that contain additional product information.
If you cannot find answers to your technical questions from these sources, you
can use the internet, e-mail, telephone, or fax to contact MTS for assistance.
MTS provides a full range of support services after your system is installed. If
you have any questions about a system or product, contact MTS in one of the
following ways.
The MTS web site gives you access to our technical support staff by means of a
Technical Support link:
www.mts.com > Contact Us > Service & Technical Support
Weekdays 7:00 A.M. to 5:00 P.M., Central Time
Please include “Technical Support” in the subject line.
Before You Contact MTS
MTS can help you more efficiently if you have the following information
available when you contact us for support.
Know your site
number and system
number
Series 201 Actuator Product Information
The site number contains your company number and identifies your equipment
type (material testing, simulation, and so forth). The number is usually written on
a label on your MTS equipment before the system leaves MTS. If you do not
have or do not know your MTS site number, contact your MTS sales engineer.
Example site number: 571167
When you have more than one MTS system, the system job number identifies
which system you are calling about. You can find your job number in the papers
sent to you when you ordered your system.
Example system number: US1.42460
5
If You Contact MTS by Phone
Know information from
prior technical
If you have contacted MTS about this problem before, we can recall your file.
You will need to tell us the:
assistance
• MTS notification number
• Name of the person who helped you
Identify the problem Describe the problem you are experiencing and know the answers to the
following questions:
• How long and how often has the problem been occurring?
• Can you reproduce the problem?
• Were any hardware or software changes made to the system before the
problem started?
• What are the model numbers of the suspect equipment?
• What model controller are you using (if applicable)?
• What test configuration are you using?
Know relevant
computer information
If you are experiencing a computer problem, have the following information
available:
• Manufacturer’s name and model number
• Operating software type and service patch information
• Amount of system memory
• Amount of free space on the hard drive in which the application resides
• Current status of hard-drive fragmentation
• Connection status to a corporate network
Know relevant
For software application problems, have the following information available:
software information
• The software application’s name, version number, build number, and if
available, software patch number. This information is displayed briefly
when you launch the application, and can typically be found in the “About”
selection in the “Help” menu.
• It is also helpful if the names of other non-MTS applications that are
running on your computer, such as anti-virus software, screen savers,
keyboard enhancers, print spoolers, and so forth are known and available.
If You Contact MTS by Phone
Your call will be registered by a Call Center agent if you are calling within the
United States or Canada. Before connecting you with a technical support
specialist, the agent will ask you for your site number, name, company, company
address, and the phone number where you can normally be reached.
6
Series 201 Actuator Product Information
Problem Submittal Form in MTS Manuals
If you are calling about an issue that has already been assigned a notification
number, please provide that number. You will be assigned a unique notification
number about any new issue.
Identify system type To assist the Call Center agent with connecting you to the most qualified
technical support specialist available, identify your system as one of the
following types:
• Electromechanical materials test system
• Hydromechanical materials test system
• Vehicle test system
• Vehicle component test system
• Aero test system
Be prepared to
Prepare yourself for troubleshooting while on the phone:
troubleshoot
• Call from a telephone when you are close to the system so that you can try
implementing suggestions made over the phone.
• Have the original operating and application software media available.
• If you are not familiar with all aspects of the equipment operation, have an
experienced user nearby to assist you.
Write down relevant
Prepare yourself in case we need to call you back:
information
• Remember to ask for the notification number.
• Record the name of the person who helped you.
• Write down any specific instructions to be followed, such as data recording
or performance monitoring.
After you call MTS logs and tracks all calls to ensure that you receive assistance and that action
is taken regarding your problem or request. If you have questions about the status
of your problem or have additional information to report, please contact MTS
again and provide your original notification number.
Problem Submittal Form in MTS Manuals
Use the Problem Submittal Form to communicate problems you are experiencing
with your MTS software, hardware, manuals, or service which have not been
resolved to your satisfaction through the technical support process. This form
includes check boxes that allow you to indicate the urgency of your problem and
your expectation of an acceptable response time. We guarantee a timely
response—your feedback is important to us.
The Problem Submittal Form can be accessed:
• In the back of many MTS manuals (postage paid form to be mailed to MTS)
• www.mts.com > Contact Us > Problem Submittal Form (electronic form to
be e-mailed to MTS)
Series 201 Actuator Product Information
7
Problem Submittal Form in MTS Manuals
8
Series 201 Actuator Product Information
Before You Begin
Preface
Before You Begin
Safety first! Before you attempt to use your MTS product or system, read and understand the
Safety manual and any other safety information provided with your system.
Improper installation, operation, or maintenance of MTS equipment in your test
facility can result in hazardous conditions that can cause severe personal injury or
death and damage to your equipment and specimen. Again, read and understand
the safety information provided with your system before you continue. It is very
important that you remain aware of hazards that apply to your system.
Other MTS manuals In addition to this manual, you may receive additional MTS manuals in paper or
electronic form.
If you have purchased a test system, it may include an MTS System
Documentation CD. This CD contains an electronic copy of the MTS manuals
that pertain to your test system, including hydraulic and mechanical component
manuals, assembly drawings and parts lists, and operation and preventive
maintenance manuals. Controller and application software manuals are typically
included on the software CD distribution disc(s).
Series 201 Actuator Product Information
9
Conventions
DANGER
WARNING
CAUTION
Conventions
Documentation Conventions
The following paragraphs describe some of the conventions that are used in your
MTS manuals.
Hazard conventions As necessary, hazard notices may be embedded in this manual. These notices
contain safety information that is specific to the task to be performed. Hazard
notices immediately precede the step or procedure that may lead to an associated
hazard. Read all hazard notices carefully and follow the directions that are given.
Three different levels of hazard notices may appear in your manuals. Following
are examples of all three levels.
Note For general safety information, see the safety information provided with
your system.
Danger notices indicate the presence of a hazard with a high level of risk which,
if ignored, will result in death, severe personal injury, or substantial property
damage.
Warning notices indicate the presence of a hazard with a medium level of risk
which, if ignored, can result in death, severe personal injury, or substantial
property damage.
Caution notices indicate the presence of a hazard with a low level of risk which,
if ignored, could cause moderate or minor personal injury, equipment damage, or
endanger test integrity.
Notes Notes provide additional information about operating your system or highlight
easily overlooked items. For example:
Note Resources that are put back on the hardware lists show up at the end of
the list.
Special terms The first occurrence of special terms is shown in italics.
Illustrations Illustrations appear in this manual to clarify text. It is important for you to be
Electronic manual
conventions
10
aware that these illustrations are examples only and do not necessarily represent
your actual system configuration, test application, or software.
This manual is available as an electronic document in the Portable Document
File (PDF) format. It can be viewed on any computer that has Adobe Acrobat
Reader installed.
Series 201 Actuator Product Information
Documentation Conventions
Hypertext links The electronic document has many hypertext links displayed in a blue font. All
blue words in the body text, along with all contents entries and index page
numbers, are hypertext links. When you click a hypertext link, the application
jumps to the corresponding topic.
Series 201 Actuator Product Information
11
Documentation Conventions
12
Series 201 Actuator Product Information
Introduction
Functional Description
Functional Description
This section contains the functional description of the MTS Series 201 Hydraulic
Actuator and a description of the actuator components. It also contains the
actuator specifications such as model numbers, force ratings, dimensions,and
weights.
The Series 201 Hydraulic Actuators are heavy duty, fatigue-rated force
generation components. Designed for service to a maximum operating pressure
of 21 MPa (3000 psi), this actuator series is available in 11 different force ratings
from 7 to 400 kip tension (32 to 1770 kN). They are single-ended, heavy-duty
actuators that operate under precision servovalve control in MTS closed-loop
servohydraulic systems. When equipped with the appropriate options and
accessories, the actuators can be configured for precision testing of materials,
structures, and components.
Series 201 Hydraulic Actuators are designed to accept a wide variety of options
and accessories including force and displacement transducers, swivel rod ends,
and swivel bases. Series 201 Hydraulic Actuators are specifically designed and
manufactured to meet the needs of precision static and low frequency dynamic
testing applications.
Actuator mounting The actuator can be mounted to a wide variety of fixtures and assemblies.
Component test systems usually have one end of the actuator connected to a
custom test frame base and the other end connected to the test specimen.
Either end of the actuator can use mounting fixtures (such as swivels) to
attach it to the specimen or base.
Actuator operation Actuator piston rod movement is accomplished by supplying high-pressure
hydraulic fluid to one side of the actuator piston and opening the other side to a
return line. High-pressure hydraulic fluid is ported into the cylinder through the
retraction port or the extension port. The differential pressure across the piston
forces the piston rod to move. The amount of hydraulic fluid and the speed and
direction of piston rod movement is controlled by a servovalve.
Series 201 Actuator Product Information
13
Functional Description
If the piston rod contacts some external reaction point, then a force is applied to
that point equal to the effective piston area times the actuating pressure. The
main criteria for selecting an actuator are the force and stroke (displacement)
required for the job.
What you need to
know
MTS Systems Corporation assumes that you know how to use your controller.
See the appropriate manual for information about performing any controllerrelated step in this manual’s procedure. You are expected to know how to
perform the following procedures:
• Turn hydraulic pressure on and off.
• Select a control mode.
• Manually adjust the actuator position.
• Install a specimen.
• Define a simple test.
• Run a test.
The following cutaway view shows a typical Series 201 Hydraulic Actuator
cylinder assembly. The components illustrated in the cutaway view are common
to all Series 201 Actuators and described in the following table.
14
Series 201 Actuator Product Information
Functional Description
1
2A
3
5
5
6
7
8
9
10
2B
Typical Series 201 Hydraulic Actuator
4
Description of Series 201 Actuator Components (part 1 of 2)
I
TEM COMPONENT DESCRIPTION
1 Piston rod end (fixture
attachment end)
An internal thread is provided for mounting load cells, swivels,
interface fixtures, or other components.
2 Porting
Series 201 Actuator Product Information
High-pressure hydraulic fluid is ported into the end cap through
the retraction port (item 2A) or the extension port (item 2B).
Hydraulic fluid flow is regulated by a servovalve. As hydraulic
pressure is applied to one port, the other port is opened to a return
line, resulting in piston rod movement.
15
Functional Description
Description of Series 201 Actuator Components (part 2 of 2)
I
TEM COMPONENT DESCRIPTION
3 Piston rod
4 Piston seal
5 Piston rod bearings
6 High-pressure seal
7 Low-pressure seal and
wiper seal
8 Drainback port
9 Displacement transducer
cavity
The single-ended piston has a greater effective piston area in
compression and offers maximum compressive force in a
compact package. The hollow piston rod allows for installation
and accurate alignment of a displacement transducer.
A reinforced Teflon seal on the piston provides a positive seal
and reduces friction.
Series 201 Actuators are supplied with high-capacity nonmetallic bearings. The non-metallic bearings are standard
because of their low friction, extended life, and resistance to
failure from galling and seizure.
The high-pressure seal is designed for long life and low friction.
A small amount of fluid is allowed to flow past the high-pressure
seal for continuous bearing lubrication.
The low-pressure seal provides a hydraulic seal, while the wiper
seal functions as a scraper ring to minimize external
contamination of the seals and bearings. The low-pressure seal
wipes hydraulic fluid passed by the high-pressure seal from the
piston rod and guides the fluid into the drainback port.
Drainback ports return hydraulic fluid passed by the highpressure seal back to the system hydraulic power supply.
The Series 201 Actuator can optionally come with either a linear
variable differential transformer (LVDT) or Temposonics
displacement transducer. The displacement transducer provides a
piston rod displacement feedback signal to the system control
electronics.
10 Seal housing
The convenience of this design simplifies seal and bearing
service. The housing contains the rod end seals and wiper, and
the bearing is exposed for easy replacement when the seal
housing is removed.
16
Series 201 Actuator Product Information
Specifications
The following tables and illustrations provide information on the specifications
of the Series 201 Actuators.
Piston Area and Force Rating
M
ODEL PISTON AREA FORCE
TENSION AREA COMPRESSION AREA TENSION COMPRESSION
2
IN
201.17 2.5 16.2 4.9 31.7 7 32 14 63
201.20 5.2 33.3 8.3 53.5 15 66 24 107
201.25 7.7 49.4 12.6 81.1 22 99 36 162
201.30 12.6 81.1 19.6 126.7 36 162 57 253
201.35 18.7 120.3 28.3 182.4 55 240 80 365
201.40 22.6 145.7 38.5 248.3 65 290 110 495
201.45 34.4 221.7 50.3 324.3 100 445 145 650
201.60 50.3 324.3 78.5 506.7 145 650 230 1015
CM
2
2
IN
CM
2
KIP K
N KIP KN
Specifications
201.70 74.6 481.4 113.1 729.7 215 965 330 1460
201.80 103.7 668.9 153.9 993.2 300 1335 445 1985
201.90 137.4 886.7 201.1 1297.2 400 1775 585 2595
Series 201 Actuator Product Information
17
Actuator Dimensions
Lifting Holes (4)
Rod Insert
D Thread
E Deep
Rod Insert
D Thread
E Deep
Stroke
Stroke Length
Stroke Length
Stroke Length
Stroke
Actuator Dimensions
Series 201 Actuator Dimensions
*
MODEL ROD DIAMETER AB C
IN MM IN MM IN MM IN MM
201.17 1.75 44.5 4.90 124 7.87 199.9 2.12 53.8
201.20 2.00 50.8 5.06 129 8.37 212.6 2.12 53.8
201.25 2.50 63.5 5.06 129 8.37 212.6 2.12 53.8
201.30 3.00 76.2 5.56 141 9.27 235.5 2.62 66.5
201.35 3.50 88.9 5.82 148 10.03 254.8 2.88 73.2
201.40 4.50 114.3 7.28 185 11.00 279.4 3.75 95.3
201.45 4.50 114.3 7.28 185 11.90 302.3 3.75 95.3
201.60 6.00 152.4 9.08 231 13.65 346.7 5.00 127.0
201.70 7.00 177.8 10.20 259 15.97 405.6 5.62 142.7
201.80 8.00 203.2 10.45 265 16.90 429.3 5.62 142.7
201.90 9.00 228.6 10.95 278 18.42 467.9 5.62 142.7
* Dimensions A, B, and C are for actuators designed to accept Temposonics displacement
transducers. Dimensions for actuators designed to accept LVDTs might differ slightly.
18
Series 201 Actuator Product Information
Actuator Dimensions
Series 201 Actuator Dimensions
M
ODEL DEFG
US
201.17 1" - 14 M27 x 2 1.75 44.5 2.00 50.8 2.00 51
201.20 1" - 14 M27 x 2 1.75 44.5 2.00 50.8 2.00 51
201.25 1" - 14 M27 x 2 1.75 44.5 2.00 50.8 2.00 51
201.30 1 1/2” - 12 M36 x 2 2.25 57.2 2.00 50.8 2.00 51
201.35 1 1/2” - 12 M36 x 2 2.25 57.2 2.00 50.8 2.00 51
201.40 2" - 12 M52 x 2 2.25 57.2 2.00 50.8 2.25 57
201.45 2" - 12 M52 x 2 2.25 57.2 2.00 50.8 2.25 57
201.60 3" - 12 M76 x 2 3.00 76.2 2.00 50.8 2.50 64
201.70 3 1/2” - 12 M90 x 2 3.50 88.9 2.00 50.8 2.75 70
201.80 3 1/2” - 12 M90 x 2 3.50 88.9 2.00 50.8 2.75 70
201.90 4 1/2” - 8 M125 x 4 4.50 114.3 2.00 50.8 2.75 70
CUST.SI METRIC IN MM IN MM IN MM
Lifting Holes
M
ODEL LIFT HOLE SIZE
201.17 1/4”- 20
201.20 1/4”- 20
201.25 3/8” - 16
201.30 1/2” - 13
201.35 1/2” - 13
201.40 1/2” - 13
201.45 1/2” - 13
201.60 3/4” - 10
201.70 1" - 8
201.80 1" - 8
201.90 1" - 8
Series 201 Actuator Product Information
19
End Cap and Base Dimensions
201.17
201.20
201.25
BaseEnd Cap
End Cap and Base Dimensions
20
Series 201 Actuator Product Information
End Cap and Base Dimensions
201.30
201.35
201.40
BaseEnd Cap
Series 201 Actuator Product Information
21
End Cap and Base Dimensions
201.45
201.60
BaseEnd Cap
22
Series 201 Actuator Product Information
End Cap and Base Dimensions
201.70
201.80
201.90
End Cap
Base
Series 201 Actuator Product Information
23
End Cap and Base Dimensions
24
Series 201 Actuator Product Information
Safety
4
(27.6 MPa).
2
4
Hazard Placard Placement
Hazard placards contain specific safety information and are affixed directly to the
system so they are plainly visible.
Each placard describes a system-related hazard. When possible, international
symbols (icons) are used to graphically indicate the type of hazard and the
placard label indicates its severity. In some instances, the placard may contain
text that describes the hazard, the potential result if the hazard is ignored, and
general instructions about how to avoid the hazard
The following labels and icons may be found on an actuator.
L
ABEL DESCRIPTION
Hazard Placard Placement
Part # 46-140-101
Part # 46-140-201
WA RN I NG
Hydraulic pressure above 3000 psi can rupture
components. Can cause severe personal injury
or damage to equipment.
Do not exceed 3000 psi (20.7 MPa).
Read instructions before operating or
servicing.
WA RN I NG
Hydraulic pressure above 4000 psi can rupture
components. Can cause severe personal injury
or damage to equipment.
Do not exceed 4000 psi (27.6 MPa).
Read instructions before operating or
servicing.
Series 201 Actuator Product Information
25
Hazard Placard Placement
L
ABEL DESCRIPTION
CAUTION
High drain pressure can cause rod seal damage
and hydraulic oil leakage.
Remove drain line shipping cap and connect
drain hose before operating.
Part # 045-283-501
Attached mass warning.
Do not exceed maximum attached mass.
Part # 057-230-041
Part # 700-004-198
Hydraulic Actuator ID tag lists the following:
• Model number
• Serial number
• Assembly number/Rev
• Force rating
• Effective Area
• Static Stroke
• Dynamic Stroke
• Hydrostatic/Non-Hydrostatic
• Maximum attached mass
26
Series 201 Actuator Product Information
L
ABEL DESCRIPTION
Hydraulic Actuator ID tag lists the following:
• Model number
• Serial number
• Assembly number/Rev
• Force rating
• Effective Area
• Static Stroke
Hazard Placard Placement
Part # 037-588-801
Part # 57-237-711
Part # 057-238-503
• Dynamic Stroke
• Hydrostatic/Non-Hydrostatic
Pressure icon.
Can be used alone, or in conjunction with
pressure rating label (Part # 057-238-503).
Pressure rating label.
Actual rating listed on this label will vary. This
label is used in conjunction with the Pressure
icon (Part # 057-237-711). Located directly
beneath pressure icon on actuator.
Series 201 Actuator Product Information
27
Hazard Placard Placement
28
Series 201 Actuator Product Information
Installation
Installing the Actuator
Installing the Actuator
Whenever lifting the actuator, always use four lifting shackles, installed securely
into the lifting holes in the front and rear end caps.
Fixtures can be mounted to the actuator piston rod and rear end cap. The piston
rod is threaded to accept a stud. The rear end cap has between four and sixteen
threaded holes for the mounting of a swivel.
When using the Series 201 Actuator in a fatigue application the use of Model 249
Swivels and spiral washers is highly recommended to minimize the affects of
offset loads. Series 201 Actuators are not fatigue rated for high dynamic or offset
loading conditions.
Series 201 Actuator Product Information
29
Spiral Washers
Mounting bolt
specifications
A Series 201 Actuator equipped with a swivel base typically has the base bolted
to a reaction mass. The following table lists information for the mounting bolt
specifications.
M
ODEL RECOMMENDED
MOUNTING BOLT SIZE
*
RECOMMENDED
MOUNTING BOLT TORQUE
RECOMMENDED
MOUNTING BOLT GRADE
SI U.S. STD.N M (FOR SI) LBF FT (FOR U.S.) ISO SAE
201.17 M12 x 1.75 1/2-13 93 84 12.9 8
201.20 M16 x 2.00 5/8-11 230 160 12.9 8
201.25 M16 x 2.00 5/8-11 230 160 12.9 8
201.30 M16 x 2.00 5/8-11 230 160 12.9 8
201.35 M24 x 3.00 1-8 780 680 12.9 8
201.40 M24 x 3.00 1-8 780 680 12.9 8
201.45 M30 x 3.50 1 1/4-7 1600 1360 12.9 8
201.60 M42 x 4.00 1 1/2-6 3200 2400 12.9 8
201.70 M42 x 4.00 1 1/2-6 3200 2400 12.9 8
201.80 M48 x 5.00 1 3/4-5 6500 3700 12.9 8
201.90 M56 x 5.50 2-4 1/2 10,000 5600 12.9 8
* Sizes listed are for standard Series 201-style swivels. Series 249 Swivels might use different sizes.
Spiral Washers
The optional MTS Model 601 Spiral Washers are typically used to provide
fatigue-rated connections between elements of the force train and to minimize the
effects of backlash. If the operating procedure requires changing of preloaded
force train elements such as the load cell or swivel, the spiral washers must be
readjusted.
The spiral washers are placed over the connector studs at each connection, and
adjusted to place a constant preload on the stud.
30
Series 201 Actuator Product Information
Installing Accessories with Spiral Washers
Swivel Head
Spiral Washers
Connector Studs
Spiral Washers
Actuator Rod
Compliant Material
Load Cell
Compliant Material
Upper End Cap
Installing Accessories with Spiral Washers
The procedure requires two spanner wrenches and assumes that you are familiar
with all operating aspects of your system.
1. Ensure that system hydraulic pressure has been reduced to zero before
proceeding. To do this, turn off the hydraulic power unit and exercise the
actuator until it stops moving.
2. Clean the connector studs and the internal threads of the force train
element(s). Inspect the thread mating surfaces for signs of contamination or
corrosion. All damaged threads should be repaired or the component
replaced.
3. Apply a thin layer of Molykote G paste, or equivalent, to all thread mating
surfaces.
4. When installing a load cell, place a small piece of compliant material inside
the load cell to keep the stud from contacting the bottom of the hole.
5. Slowly turn the connector stud into an element of the force train (for
example, the actuator rod). The connector stud should turn freely. If any
resistance is encountered, disassemble and correct the problem before
proceeding.
Series 201 Actuator Product Information
31
Installing Accessories with Spiral Washers
Medium
Thickness
Connector
Stud
Spiral Washer Rotation
to Increase Thickness
Connector
Stud
Do Not Exceed
6. Place the spiral washers together with the spiral surfaces facing each other.
7. Place the set of spiral washers over the connector stud and rotate them until
they are at minimum thickness. Place the appropriate accessory (load cell,
fixture, for example) on the connector stud and tighten the spiral washers by
hand.
8. Repeat Steps 2 through 7 for all spiral washers.
9. Install the actuator into a suitable fixture that can withstand a tensile load
10%–20% greater than the maximum load to be applied to the connector
stud during testing.
10. Select force control with the system controller.
32
Series 201 Actuator Product Information
Removing Accessories with Spiral Washers
WARNING
CAUTION
Do not exceed the maximum HPU output pressure or apply a force greater
than any force train component capacity.
Exceeding the tensile load capacity of any element in the force train can
cause equipment damage and/or personal injury.
It is necessary to temporarily exceed the tensile load capacity to achieve the
requirements of Step 12 in this procedure. This is accomplished by increasing the
output pressure of the HPU. For more information, contact MTS Systems
Corporation.
11. Turn on the system hydraulic pressure.
Note Be sure all components in the force train can accommodate the required
tensile load.
12. Apply a static tensile load 10%–20% higher than the maximum load to be
applied during testing.
If your test requires the maximum tensile load of the force train, you will
need to adjust the output pressure of the HPU to reach the required tensile
load.
If the spiral washers are not sufficiently tightened, the connector stud can
break when subjected to cyclic loads.
Perform the appropriate procedure to ensure that the spiral washers are properly
tightened.
13. Using the spanner wrenches, rotate the spiral washers in opposite directions
to tighten them. The opening between the washers must not exceed an arc of
30° from the closed position.
If more than a 30° arc is created, remove the tensile load from the actuator.
Then remove the connector stud. Examine the connector stud for any signs
of thread wear. If wear is noticed, replace the stud and repeat the previous
procedure.
Removing Accessories with Spiral Washers
The procedure requires two spanner wrenches and assumes that you are familiar
with all operating aspects of your system.
1. Ensure that system hydraulic pressure has been reduced to zero before
proceeding. To do this, turn off the hydraulic power unit and exercise the
actuator until it stops moving.
Series 201 Actuator Product Information
33
Removing Accessories with Spiral Washers
WARNING
2. Install the actuator in a suitable fixture that can withstand a tensile load 10%
to 20% greater than the maximum load to be applied during testing.
3. Select force control at the system controller.
4. Apply system hydraulic pressure according to applicable system procedures.
Do not exceed the maximum HPU output pressure or apply a force greater
than any force train component capacity.
Exceeding the tensile load capacity of any element in the force train can
cause equipment damage and/or personal injury.
It is necessary to temporarily exceed the tensile load capacity. This is
accomplished by increasing the output pressure of the HPU. For more
information, contact MTS Systems Corporation.
Note Be sure all components in the force train can accommodate the required
tensile load.
5. Apply a static tensile load 10%–20% higher than the maximum load to be
applied during testing.
6. Use the spanner wrenches to rotate the spiral washers to reduce their
combined thickness to a minimum.
7. Reduce tensile load to zero and remove hydraulic pressure. Ensure that all
residual pressure (including accumulator pressure) has bled off.
8. Remove force train components (such as load cell, swivel rod end, or
fixtures) from the actuator.
34
Series 201 Actuator Product Information
Operation
Port A
Port B
This section discusses the operation of the Series 201 Hydraulic Actuator and the
optional displacement transducer.
Series 201 Actuator Operation
Actuator piston rod movement is accomplished by supplying high-pressure
(21MPa [3000 psi] maximum) hydraulic fluid to one side of the actuator piston
and opening the other side to a return line. The pressure differential across the
piston forces the piston rod to move. The amount of hydraulic fluid and the speed
and direction of piston rod movement is controlled by a servovalve (For
additional information, refer to the servovalve Product Manual ).
When hydraulic pressure is applied to port A and port B is opened to the return
line, the piston rod extends from the actuator. When hydraulic pressure is applied
to port B and port A is opened to the return line, the piston rod retracts. The force
applied to a specimen attached between the actuator piston rod end and a reaction
mass is the product of the applied differential hydraulic pressure and the effective
piston area. For the effective piston area, refer to the specification tables .
Series 201 Actuator Operation
Optional Displacement Transducer Operation
The internally mounted displacement transducer provides an indication of the
actuator piston rod displacement. The displacement transducer can be either an
LVDT (linear variable differential transformer) or Temposonics magnetostrictive
position sensor.
All displacement transducer adjustments are made at the factory. There are no
field adjustments.
Series 201 Actuator Product Information
35
Optional Displacement Transducer Operation
LVDT The LVDT is an electromechanical device that provides an output voltage that is
proportional to the displacement of a moveable core extension. The core
extension is attached to a core mount that is secured inside the piston. The core
extension is axially oriented in the LVDT coil. The LVDT coil is connected to an
LVDT mounting that secures the LVDT assembly.
Temposonics sensors Temposonics linear sensors use the time-based magnetostrictive position sensing
principle developed by MTS. Within the sensing element, a sonic strain pulse is
induced in a specially-designed magnetostrictive waveguide by the momentary
interaction of two magnetic fields. One field comes from a movable permanent
magnet that passes along the outside of the sensor. The other field comes from an
“interrogation” current pulse applied along the waveguide. The resulting strain
pulse travels along the waveguide and is detected at the head of the sensing
element. The position of the magnet is determined by measuring the elapsed time
between the application of the interrogation pulse and the arrival of the resulting
strain pulse with a high speed counter. Using the elapsed time to determine
position of the permanent magnet provides an absolute position reading that
never needs recalibration or re-homing after a power loss. Non-contact sensing
eliminates wear, and provides durability and output repeatability.
36
Series 201 Actuator Product Information
Maintenance
As necessary If a compression relief valve is installed, check and adjust the compression relief
Weekly Clean exposed areas of the actuator piston rod with a clean, dry, lint-free rag. If
Monthly Inspect actuator piston rod and seals for excessive wear and/or leakage. Small
Yearly Change actuator seals if necessary. Actuator assemblies can require more or less
Series 201 Hydraulic Actuators are designed for extended periods of operation
with minimal maintenance requirements. A summary of the routine maintenance
procedures is listed below.
valve operating pressure to ensure that the maximum actuator compression force
is consistent with the current test requirements.
Check the torque of bolted connections to ensure system integrity. Loose bolts
can lead to component failure.
the actuator is continually exposed to a dirty operating environment, clean the
piston rod on a daily basis.
scratches in the axial direction of the piston rod or polishing of the rod surface is
considered normal operating wear.
frequent seal changes depending on usage. External oil leakage or decreased
performance are indications of seal wear. For information on seal replacement,
contact MTS Systems corporation .
Series 201 Actuator Product Information
37
38
Series 201 Actuator Product Information
m
MTS Systems Corporation
14000 Technology Drive
Eden Prairie, Minnesota 55344-2290 USA
Toll Free Phone: 800-328-2255
(within the U.S. or Canada)
Phone: 952-937-4000
(outside the U.S. or Canada)
Fax: 952-937-4515
E-mail: info@mts.com
Internet: www.mts.com
ISO 9001 Certified QMS
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