be certain.
m
Series 247 Actuators
Product Information
Model 247.11
Model 247.12
Model 247.21
Model 247.22
Model 247.23
Model 247.31
011-560-000 D
Copyright information © 2008 MTS Systems Corporation. All rights reserved.
Trademark information MTS is a registered trademark of MTS Systems Corporation within the United
States. These trademarks may be protected in other countries.
Tellus is a registered trademark of Shell Oil Corporation. Molykote is a
registered trademark of Dow Chemical Corporation. All other trademarks or
service marks are property of their respective owners.
Publication information
Manual Part Number Publication Date
011-560-000 A November 1984
011-560-000 B August 1991
011-560-000 C November 2000
011-560-000 D September 2009
2
Series 247 Actuators
Contents
Technical Support 5
How to Get Technical Support 5
Before You Contact MTS 5
If You Contact MTS by Phone 7
Problem Submittal Form in MTS Manuals 8
Preface 9
Before You Begin 9
Conventions 10
Documentation Conventions 10
Introduction 13
Component Identification 15
Functional Description 17
Specifications 19
Safety Information 23
Hazard Placard Placement 23
Installation 27
Installing Components on the Actuator 28
Spiral Washers 30
Installing Fixtures with Spiral Washers 31
Removing Fixtures with Spiral Washers 34
Connecting the LVDT Cable 35
Connecting Hydraulics 36
Maintenance 37
Series 247 Actuators Contents
3
4
Contents
Series 247 Actuators
Technical Support
How to Get Technical Support
How to Get Technical Support
Start with your
manuals
Technical support
methods
The manuals supplied by MTS provide most of the information you need to use
and maintain your equipment. If your equipment includes software, look for
online help and README files that contain additional product inform ation.
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 Technical Support in
one of the following ways.
www.mts.com The web site provides access to our technical support staff by means of an
onlineform:
www.mts.com > Contact MTS > Service & Technical Support button
E-mail tech.support@mts.com
Telephone MTS Call Center 800-328-2255
Weekdays 7:00 A.M. to 5:00 P.M., Central Time
Fax 952-937-4515
Please include “Technical Support” in the subject line.
Outside the U.S. For technical support outside the United States, contact your local sales and
service office. For a list of worldwide sales and service locations and contact
information, use the Global MTS link at the MTS web site:
www.mts.com > Global MTS > (choose your region in the right-hand
column) > (choose the location closest to you)
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 247 Actuators Technical Support
The site number contains your company number and identifies your equipment
type (such as material testing or simulation). The number is typically written on a
label on your equipment before the system leaves MTS. If you do not know your
MTS site number, contact your sales engineer.
Example site number: 571167
When you have more than one MTS system, the system job number identifies
your system. You can find your job number in your order paperwork.
Example system number: US1.42460
5
Before You Contact MTS
Know information from
prior technical
If you have contacted MTS about this problem before, we can recall your file
based on the:
assistance
• MTS notification number
• Name of the person who helped you
Identify the problem Describe the problem and know the answers to the following questions:
• How long and how often has the problem occurred?
• Can you reproduce the problem?
• Were any hardware or software changes made to the system before the
problem started?
• What are the equipment model numbers?
• What is the controller model (if applicable)?
• What is the system configuration?
Know relevant
For a computer problem, have the following information available:
computer information
• Manufacturer’s name and model number
• Operating software type and service patch information
Know relevant
software information
• Amount of system memory
• Amount of free space on the hard drive where the application resides
• Current status of hard-drive fragmentation
• Connection status to a corporate network
For software application problems, have the following information available:
• The software application’s name, version number, build number, and (if
available) software patch number. This information can typically be found
in the About selection in the Help menu.
• The names of other applications on your computer, such as:
– Anti-virus software
– Screen savers
– Keyboard enhancers
– Print spoolers
– Messaging applications
Technical Supp ort
6
Series 247 Actuators
If You Contact MTS by Phone
If You Contact MTS by Phone
A Call Center agent registers your call before connecting you with a technical
support specialist. The agent asks you for your:
• Site number
• Name
• Company name
• Company address
• Phone number where you can be reached
If your issue has a notification number, please provide that number. A new issue
will be assigned a unique notification number.
Identify system type To enable the Call Center agent to connect you with the most qualified technical
support specialist available, identify your system as one of the following types:
• Electromechanical material test system
Be prepared to
troubleshoot
Write down relevant
information
After you call MTS logs and tracks all calls to ensure that you receive assistance for your
• Hydromechanical material test system
• Vehicle test system
• Vehicle component test system
• Aero test system
Prepare to perform troubleshooting while on the phone:
• Call from a telephone close to the system so that you can implement
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.
In case Technical Support must call you:
• Verify the notification number.
• Record the name of the person who helped you.
• Write down any specific instructions.
problem or request. If you have questions about the status of your problem or
have additional information to report, please contact Technical Support again and
provide your original notification number.
Series 247 Actuators Technical Support
7
Problem Submittal Form in MTS Manuals
Problem Submittal Form in MTS Manuals
Use the Problem Submittal Form to communicate problems with your software,
hardware, manuals, or service that are not resolved to your satisfaction through
the technical support process. The 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.
Access the Problem Submittal Form:
• In the back of many MTS manuals (postage paid form to be mailed to MTS)
• www.mts.com > Contact Us > Problem Submittal Form button (electronic
form to be e-mailed to MTS)
Technical Supp ort
8
Series 247 Actuators
Before You Begin
Preface
Before You Begin
Safety first! Before you 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 can result in hazardous conditions that can
cause severe personal injury or death, or 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 manuals in paper or
electronic form.
You may also receive an MTS System Documentation CD. It contains an
electronic copy of the manuals that pertain to your test system, such as:
• Hydraulic and mechanical component manuals
• Assembly drawings
• Parts lists
• Operation manual
• Preventive maintenance manual
Controller and application software manuals are typically included on the
software CD distribution disc(s).
Series 247 Actuators Preface
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 Hazard notices may be embedded in this manual. These notices contain safety
information that is specific to the activity 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 all directions and recommendations.
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 or equipment damage,
or could 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. They are examples only and do
Electronic manual
conventions
Preface
10
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 247 Actuators
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 247 Actuators Preface
11
Documentation Conventions
12
Preface
Series 247 Actuators
Introduction
Contents Component Identification 15
The Series 247 Hydraulic Actuators are double-acting, single-ended, heavy-duty
actuators that operate under precision servovalve control in MTS closed-loop
servohydraulic systems. Typical applications for the actuators include structural
and static testing where a long stroke is required. Series 247 Hydraulic Actuators
are routinely used in systems requiring precision force generation and accurate
control of piston rod displacement.
Functional Description 17
Specifications 19
What you need to
know
Series 247 Actuator
This manual assumes that you know how to use your system controller. See the
appropriate manual for information about performing any controller-related step
in this manual’s procedures. You are expected to know how to do the following:
• Turn hydraulic pressure on and off
• Select a control mode
• Manually adjust the actuator position
• Instal a specimen
• Define a simple test
• Run a test
Series 247 Actuators Introduction
13
Related products The Series 247 Actuators works in conjunction with other products. See the
following product information manuals for product-specific informat ion and
maintenance procedures:
• The Series 249 Swivels Product Information manual (MTS part number
011-775-600).
• The Series 252 Servovalve Product Information manual (MTS part number
011-182-906).
• The Series 256 Servovalve Product Information manual (MTS part number
011-209-602).
Actuator identification A plate on the actuator (typically located on the front end cap opposite the drain
line) contains the following information:
• Model number
• Force rating
• Stroke specifications
• Serial number
• Area
This information is required when contacting MTS Systems Corporation
regarding the actuator.
14
Introduction
Series 247 Actuators
Component Identification
Extension
Port
Front End
Cap
Piston
Seal
Piston
Bearing
Front End
Cap
Retraction
Port
Drainback
Port (on back)
Actuator
Rod
LVDT
Connector
O-ring
LVDT
Coil
LVDT Core
Extension
High Pressure
Seal/O-ring
Low Pressure
Seal/Wiper
O-ring
Component Identification
Extension port/
Retraction port
Piston seal
Piston bearing
Drainback port
Piston rod
Low-pressure seal
Component Descriptions (part 1 of 2)
Item Description
High-pressure hydraulic fluid is ported into the cylinder through the retraction
port or the extension port. The flow is regulated by a servovalve. As hydraulic
pressure is applied to one port, the other port is opened to a return line causing
the actuator to extend or to retract.
A reinforced Teflon® seal on the piston provides a positive seal and reduces
friction.
These high-capacity nonmetallic bearings are bonded directly to the end caps.
The nonmetallic bearings are standard due to their high sideload tolerance and
resistance to failure from galling and seizure.
The drainback port allows fluid that manages to leak past the seals to be routed
out of the actuator. This prevents pressure pockets from interfering with the
actuator performance.
The piston rod is machined from a heat-treated alloy steel, hard-chrome plated,
and precision ground to a fine finish for reliable operation. The piston rod is
hollow to allow for installation and accurate alignment of a displacement
transducer. The piston rod end has an internal thread for mounting force
transducers, swivels, and test fixtures.
The low-pressure seal assembly contains a seal to guide excess fluid to the
drain back port and a wiper to prevent external contamination from entering
the actuator.
Series 247 Actuators Introduction
15
Component Identification
Item Description
Component Descriptions (part 2 of 2)
High-pressure seal
LVDT assembly
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 internally mounted LVDT measures the actuator piston rod displacement.
The LVDT consists of a coil and a core extension. The coil is secured to the
rear end cap. The core extension is secured to the inside of the hollow piston
rod by a locking setscrew.
16
Introduction
Series 247 Actuators
Functional Description
Functional Description
A linear actuator is used to push or to pull on a specimen. A linear actuator
consists of a cylinder that contains a piston and end caps which include the
hydraulic ports to control the piston.
The double-acting, single-ended actuator operates under precision servovalve
control in MTS closed-loop servohydraulic systems. The actuator is a
hydraulically powered piston that can extend or retract (double-acting). It has
unequal piston areas which causes it to develop higher compression forces than
in tension (single-ended).
The actuator has a hollow piston to allow an LVDT (linear variable differential
transformer) to be installed. An LVDT measures the displacement of the actuator
(extension or retraction) and sends the information to the system controller. It can
be replaced with other specialized measuring devices.
Actuator mounting The actuator can be mounted to a wide variety of fixtures and assemblies
including force and displacement transducers, pedestal bases, clevis (also called
pivots), swivel rod ends, and swivel bases. Either end of the actuator can use
mounting fixtures. When equipped with the appropriate options and accessories,
the actuator can be configured for precision testing of materials, structures and
components. 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.
Servovalve interface The actuator requires a servovalve manifold to allow a servovalve to be mounted
to the actuator. The manifold connects to the actuator ports in the end caps and
route the extension and retraction ports to the required foot print of the
servovalve. Hydraulic power is also connected to the manifold and routed to the
servovalve.
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.
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.
Series 247 Actuators Introduction
17
Functional Description
Retainer
Core
L VDT Core
Extension
Hollow
Piston Rod
LVDT Coil
Locking Collar
LVDT
Connector
LVDT operation The internally mounted LVDT
provides an indication of the
actuator piston rod position in its
displacement.
The LVDT is an electromechanical
device that provides an output
voltage which is proportional to the
displacement of a moveable core
extension. The core extension is
mounted inside the hollow piston
rod and moves as the piston rod
moves. The L VDT coil is secured to
the pedestal base by a locking
collar. The core extension is
positioned in the LVDT coil to
provide a zero reference point, and
is locked in place with a locking
setscrew.
As the piston rod moves during
operation, the output voltage from
the LVDT indicates how far the
piston rod has moved from the zero
reference point.
18
Introduction
Series 247 Actuators
Specifications
Model
Force Rating
Tension Compression Tension Compression
Specifications
This section lists the specifications and dimensions for the Series 247 Actuator.
Single-Ended Actuator Specifications
*
Effective Piston Area Rod Diameter
kN kip kN kip
247.11 16.1 3.6 48 10.8 7.81 1.21 23.23 3.6 44.5 1.75
247.12 27.9 6.3 59.9 13.5 13.45 2.09 28.97 4.49 44.5 1.75
247.21 51.8 11.6 131 29.5 25.03 3.88 63.36 9.82 69.9 2.75
247.22 100.8 22.7 180 40.5 48.7 7.55 87.02 13.49 69.9 2.75
247.23 169.5 38.1 248.7 55.9 81.91 12.7 120.23 18.64 69.9 2.75
247.31 261.6 58.8 408.9 91.9 126.4 19.6 197.68 30.64 95.3 3.75
* Nominal force with 21 MPa (3000 psi) hydraulic pressure.
cm
2
2
in
cm
2
2
in
mm in
Series 247 Actuators Introduction
19
Specifications
247.1x
247.2x/.3x
Rear
Endcap
Front
Endcap
Front
Endcap
Dimensions The letters in the following tables correspond to the letters in the “Series 247
Actuator Dimensions” on page 21.
Actuator Cylinder Dimensions
Model Displacement A B C
mm in mm in mm in mm in
247.11 508 20 256.8 10.11 89.5 3.52 101.6 4
247.12 762 30 256.8 10.11 89.5 3.52 101.6 4
247.21 1016 40 266.7 10.47 120 4.72 127 5
247.22 1016 40 267.3 10.52 122.6 4.82 152.4 6
247.23 1016 40 268.6 10.57 123.8 4.87 165.1 6.5
247.31 1397 55 304.2 11.97 137.8 5.42 215.9 8.5
20
Introduction
Series 247 Actuators
Model
Series 247 Actuator Dimensions
Actuator Dimensions
Model D E
SI Metric U.S. Customary mm in
247.11 M27x2 mm 1-14 UNS 50.8 2
247.12 M27x2 mm 1-14 UNS 50.8 2
247.21 M27x2 mm 1-14 UNS 50.8 2
247.22 M27x2 mm 1-14 UNS 50.8 2
247.23 M27x2 mm 1-14 UNS 50.8 2
247.31 M36x2 mm 2-12 UNS 63.5 2.5
The letters in the following tables correspond to the letters in the “Series 247
Actuator Dimensions” on page 21.
Front End Cap Dimensions
HI
*
F
G
mm in mm in
Specifications
247.11 4 3/8-16 UNC 19.1 0.75 81.3 3.2
247.12 4 3/8-16 UNC 19.1 0.75 81.3 3.2
247.21 8 1/2-13 UNC 19.1 0.75 104.1 4.1
247.22 8 1/2-13 UNC 19.1 0.75 104.1 4.1
247.23 8 1/2-13 UNC 19.1 0.75 104.1 4.1
247.31 8 5/8-11 UNC 25.4 1 139.7 5.5
* The holes are evenly spaced on the diameter of “I”.
Rear End Cap Dimensions
HI
Model
247.11 4 3/8-16 UNC 19.1 0.75 88.9 3.5
247.12 4 3/8-16 UNC 19.1 0.75 88.9 3.5
247.21 4 5/8-11 UNC 25.4 1 127 5
247.22 4 5/8-11 UNC 25.4 1 127 5
247.23 4 5/8-11 UNC 25.4 1 127 5
*
F
G
mm in mm in
247.31 4 7/8-9 UNC 36.5 1.4 191.7 7.53
* The holes are evenly spaced on the diameter of “I”.
Series 247 Actuators Introduction
21
Specifications
22
Introduction
Series 247 Actuators
Safety Information
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.
Label Description
Hazard Placard Placement
Part #46-140-101
Part #46-140-201
WARNING
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.
WARNING
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 247 Actuators Safety Information
23
Hazard Placard Placement
Part # 045-283-501
Label 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.
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
Safety Information
24
Series 247 Actuators
Hazard Placard Placement
Label Description
Hydraulic Actuator ID tag lists the following:
• Model number
• Serial number
• Assembly number/Rev
• Force rating
• Effective Area
• Static Stroke
Part # 037-588-801
Part # 57-237-711
Part # 57-238-5xx
• Dynamic Stroke
• Hydrostatic/Non-Hydrostatic
Pressure icon.
Can be used alone, or in conjunction with
pressure rating label (Part # 57-238-5xx).
Pressure rating. Actual rating listed on this
label will vary; 57-238-503 shown. This label
is used in conjunction with the Pressure icon
(Part # 57237711). Located directly beneath
pressure icon on actuator.
Series 247 Actuators Safety Information
25
Hazard Placard Placement
Safety Information
26
Series 247 Actuators
Installation
Contents Installing Components on the Actuator 28
Installing the Series 247 Actuators depends on the testing application:
• structural or vibration testing
• materials or component testing
For structural or vibration testing, the actuator is typically secured to a reaction
mass using a swivel or pedestal base. This section describes how to install the
actuator for this type of configuration.
Although uncommon, the actuator can be configured for materials or component
testing. In these configurations, the actuator is typically installed in a test fixture
at the factory. Actuator options such as servovalves and manifolds are also
installed on the actuator at the factory. The only installation required is to connect
system hydraulic hoses and system cables.
Spiral Washers 30
Installing Fixtures with Spiral Washers 31
Removing Fixtures with Spiral Washers 34
Connecting the LVDT Cable 35
Connecting Hydraulics 36
Series 247 Actuators Installation
27
Installing Components on the Actuator
Swivel
Spiral
Washers
Force
Transducer
Swivel
Rod End
Connector
stud
Force
Transducer
Connector
Stud
Actuator
Assembly
Spiral
Washers
Drain
Fitting
Actuator
Assembly
Servovalve
Hydraulic
Ports
Manifold
Assembly
Pedestal
Base
Swivel
Base
Manifold
Assembly
Installing Components on the Actuator
Several optional components can be mounted to the actuator pisto n rod or the
rear end cap. The front end cap has four or eight threaded mounting holes. The
rear end cap has four threaded mounting holes. See “Series 247 Actuator
Dimensions” on page 21 for dimensions, mounting hole patterns, and thread
sizes. The following figure shows some of the types of components available:
28
Installation
Typical Installation Components
Series 247 Actuators
Installing Components on the Actuator
Swivels Swivels and pedestals perform the same function. They anchor the actuator
between a reaction mass and the test specimen or test fixture. The swivels allow
the actuator to pivot and tilt (see the Series 249 Swivels product information
manual, part number 011-775-600). And a pedestal anchors the actuator with no
movement. These devices are designed to be attached to the base of the actuator
or the actuator rod. And they can be used in combinations of each other.
Spiral washers Spiral washers preload the elements of the force train to provide backlash-free
connections. They are typically used to attach swivels and force transducers to
the actuator. If spiral washers are used, see “Spiral Washers” on page 30 for
information about installing and removing fixtures.
Force transducers Force transducers (also called load cells or force sensors) are often installed in
the force train of the actuator. Force transducers are not required components.
Manifolds The actuator requires a manifold to distribute hydraulic fluid to the servovalve(s)
and the hydraulic ports of the actuator. Other components may be mounted to the
manifold (such as differential pressure transducers, special piping, etc.). The
manifold is usually installed at the factory.
Servovalves A servovalve is installed on a manifold that is mounted to the actuator. The
servovalve is usually installed at the factory. See the appropriate product
information manual for servovalve installation information.
Series 247 Actuators Installation
29
Spiral Washers
Swivel Head
Spiral Washers
Connector
Studs
Actuator Rod
Upper End
Cap
Compliant
Material
Force
Transducer
Spiral Washers
Compliant
Material
Spiral Washers
The optional Model 601 Spiral Washers are typically used to provide fatigueresistant 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 grips, the spiral washers must be
readjusted.
When cyclic loads below the tensile force level of the preload are applied to the
connections, the load is distributed between the surfaces of the spiral washers and
the stud in a ratio of the relative stiffness of the parts. The spiral washers have a
large surface area and therefore greater stiffness. They react to most of the load
and keep the stress in the stud below its fatigue runout level. In addition to
providing fatigue-resistant connections, the spiral washers also minimize the
possibility of backlash due to loose-fitting or worn stud threads.
The spiral washers are placed over the connector studs at each connection, and
adjusted to place a constant preload on the stud. The following procedures are
included in case spiral washers are needed in the application:
• “Installing Fixtures with Spiral Washers” on page 31
• “Removing Fixtures with Spiral Washers” on page 34
30
Installation
Force Train Componen ts
Series 247 Actuators
Installing Fixtures with Spiral Washers
The procedure requires two spanner wrenches and assumes you are familiar with
all operating aspects of your system.
Note Sometimes you might have multiple fixtures in the force train that have
different force ratings. When installing the fixtures pretensioned with
spiral washers, install the fixtures with the lowest force rating first. Then
install any other fixtures from the lowest to the highest force rating.
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.
Spiral Washers
3. Apply a thin layer of Molykote
surfaces.
4. When installing a load cell, place a small piece of compliant material (such
as a styrofoam bead) inside the load cell to keep the stud from contacting the
bottom of the hole.
®
G paste, or equivalent, to all thread mating
Series 247 Actuators Installation
31
Spiral Washers
Connector
Stud
Connector
Stud
Medium
Thickness
Spiral Washer Rotation
to Increase Thickness
Do not exceed
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.
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. Mount the appropriate fixture (load cell,
grip, etc.) on the connector stud and tighten the fixture against the spiral
washers by hand.
8. Repeat Steps 2 through 7 for all spiral washers in the force train of the same
rating.
9. Connect a coupling (dummy specimen) in the force train or install the
actuator into a suitable fixture such that it can withstand a tensile load 10 to
20% greater than the maximum load to be applied to the connector stud
during testing.
10. Select force control with the system controller.
Installation
32
Series 247 Actuators
Spiral Washers
Do not exceed the maximum HPS output pressure or apply a force greater
than the capacity of any component in the force train.
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 HPS. 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 to 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 HPS to reach the required tensile
load.
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 (see the figure on the previous page).
If more than a 30° arc is created, remove the tensile load from the specimen.
Then remove the specimen and the connector stud. Examine the connector
stud for any signs of thread wear. If wear is noticed, replace the stud and
repeat Step 1 through Step 13.
Series 247 Actuators Installation
33
Spiral Washers
Removing Fixtures with Spiral Washers
The procedure requires two spanner wrenches and assumes you are familiar with
all operating aspects of your system.
Note Sometimes you might have multiple fixtures in the force train that have
different force ratings. When removing the fixtures pretensioned with
spiral washers, remove the fixtures with the lowest force rating first. Then
remove any other fixtures from the lowest to the highest force rating.
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. Install a dummy specimen or a suitable fixture in the force train such that it
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 HPS output pressure or apply a force greater
than the capacity of any component in the force train.
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 5 in this procedure. This is accomplished by increasing the
output pressure of the HPS. 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 to 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 all force train components (such as load cell, swivel rod end, gri ps,
or fixtures) attached to the actuator.
34
Installation
Series 247 Actuators
Connecting the LVDT Cable
Output
Excitation
-FB
+FB
Ground
-EX
+EX
Red
Black
Blue
Yellow
See your controller manual for cable specifications, cable assembly numbers, and
where the LVDT is connected. The following figure shows the electrical
connections of the LVDT.
Connecting the LVDT Cable
LVDT Wiring Schematic
LVDT Connector
Series 247 Actuators Installation
35
Connecting Hydraulics
Connecting Hydraulics
Hydraulic connections to the Series 247 Actuator are made through a manifold
that connects the ports of each end cap. The manifold has hydraulic pressure and
return ports stamped P and R, respectively. The drain port has a fixture installed
and it is located on the front end cap of the actuator . These ports are connected to
matching ports located on a hydraulic service manifold (HSM).
Note The size and shape of the manifold can be different. The manifold design
depends on the requirements of the test system.
Inferior quality hydraulic fluids can affect system performance.
Using fluids other than those specified by MTS can cause component or
system failure or both.
Use Mobil DTE® 25 or Shell Tellus® 46 hydraulic fluid only.
36
Installation
Series 247 Actuators
Maintenance
The Series 247 Actuators is designed for extended periods of operation without
extensive maintenance requirements.
The following table lists the recommended interval for each of these procedures.
Maintenance Intervals
What to Do When to Do It How to do it
Clean the actuator
Inspect the actuator for
wear
Replace the actuator
seals
* The interval is based on an 8 hour a day, 5 days a week operation schedule. Dusty or dirty environments
require more frequent maintenance.
Every 40 hours of continuous
operation or weekly.
Monthly. Inspect the actuator piston rod and seals for
Yearly or sooner if the actuator
inspection show excessive
leakage.
*
Clean exposed areas of the actuator piston
rod with a clean, dry, lint free rag.
If the actuator is continually exposed to a
dirty operating environment, clean the
piston rod on a daily basis.
excessive wear and/or leakage.
Small scratches in the axial direction of the
piston rod or polishing of the rod surface is
considered normal operating wear.
Arrange service with MTS Systems
Corporation.
Series 247 Actuators Maintenance
37
38
Maintenance
Series 247 Actuators
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
Loading...