MTS Landmark Tabletop User Manual

MTS Landmark™ Tabletop Load Units Product

Information

Landmark™ Axial Load Unit, Landmark™ 100 Hz

Elastomer, Bionix®

Axial/Torsional

100-206-897 E be certain.

© 2013 MTS Systems Corporation. All rights reserved.

Original Instructions (English): 100-206-897 E

Trademark Information

MTS, be certain., Bionix, ElastomerExpress, FlatTrac, FlexTest, Just In Case, LevelPlus, MTS Criterion, MTS
EM Extend, MTS Insight, MTS Landmark, RPC, ServoSensor, SWIFT, Temposonics, TestWare, TestWorks are
registered trademarks of MTS Systems Corporation within the United States. Acumen, Advantage, Aero ST,
Aero-90, AeroPro, Criterion, CRPC, Echo, Flat-Trac, Landmark, MAST, MicroProfiler, MPT, MTS Acumen, MTS
Echo, MTS Fundamentals, MTS TestSuite, ReNew, SilentFlo, TempoGuard, TestLine, and Tytron are trademarks
of MTS Systems Corporation within the United States. These trademarks may be registered in other countries.
All other trademarks are property of their respective owners.

Proprietary Software

Software use and license is governed by the MTS End User License Agreement which defines all rights retained
by MTS and granted to the End User. All Software is proprietary, confidential, and owned by MTS Systems
Corporation and cannot be copied, reproduced, disassembled, decompiled, reverse engineered, or distributed
without express written consent of MTS.

Software Verification and Validation

MTS software is developed using established quality practices in accordance with the requirements detailed in
the ISO 9001 standards. Because MTS-authored software is delivered in binary format, it is not user accessible.
This software will not change over time. Many releases are written to be backwards compatible, creating another
form of verification. The status and validity of the MTS operating software is also checked during system verification
and routine calibration of MTS hardware. These controlled calibration processes compare the final test results
after statistical analysis against the predicted response of the calibration standards. With these established
methods, MTS assures its customers that MTS products meet exacting quality standards when initially installed
and will continue to perform as intended over time.

Manual Part Number—Publication Date—Release

100-206-897 E—November 2013
100-206-897 D—July 2011
100-206-897 C1—April 2011
100-206-897 C—March 2010
100-206-897 B—April 2009
100-206-897 A—November 2008

Contents

Technical Support 7

Preface 11

Safety 15

Introduction 27

How to Get Technical Support.................................................................................................................7

Before You Contact MTS.........................................................................................................................7

If You Contact MTS by Phone.................................................................................................................9

Problem Submittal Form in MTS Manuals............................................................................................10

Before You Begin...................................................................................................................................11

Documentation Conventions..................................................................................................................11

General Safety Practices.........................................................................................................................16

Safety Practices Before Operating the System.......................................................................................16

Safety Practices While Operating the System .......................................................................................20

Load Unit Hazard Labels.......................................................................................................................22

Overview................................................................................................................................................28

What you need to know..............................................................................................................29

Related products.........................................................................................................................29

EU Declarations.....................................................................................................................................29

Component Description..........................................................................................................................31

Functional Description...........................................................................................................................33

Series 661 Force Transducers.................................................................................................................34

Dimensions.................................................................................................................................35

Series 662 Force Transducers.................................................................................................................36

Dimensions.................................................................................................................................37

Specications.........................................................................................................................................37

Installation 39

About Installation...................................................................................................................................40

Lifting and Moving the Load Unit.........................................................................................................40

Overview....................................................................................................................................40

Lift and Move the Load Unit......................................................................................................41

Connecting Cables..................................................................................................................................48

Prerequisite.................................................................................................................................48

Cable connections.......................................................................................................................48

Low Flow Power Supply............................................................................................................48

Connect Hydraulics................................................................................................................................50

MTS Landmark™ Tabletop Load Units Product Information 3

Unlock the Crosshead.............................................................................................................................51

Operation 55

Control Module......................................................................................................................................56

Specimen Installation.............................................................................................................................57

Install the Specimen...................................................................................................................58

Position the Crosshead Manually...........................................................................................................59

Manually Clamp the Crosshead ................................................................................................62

Crosshead Clamping Bolt Torque Values...................................................................................63

Move the Crosshead Hydraulically........................................................................................................63

Adjust the Grip Clamp Rate...................................................................................................................64

Adjust the Grip Clamp Force.................................................................................................................65

Handset Control......................................................................................................................................66

Handset Control Functions.........................................................................................................66

Standard Test Area Enclosure Operation...............................................................................................67

Hydraulic Power Off..................................................................................................................68

Specimen Installation and Setup................................................................................................68

Specimen Installation and Setup–Interrupt Operation...................................................68

Specimen Installation and Setup–Resume Operation....................................................68

Run Mode...................................................................................................................................69

Service........................................................................................................................................69

Emergency Stop and Actuator Velocity Limiting Switch..........................................................69

Interlock logic............................................................................................................................70

Test Area Enclosure with Light Curtain.................................................................................................70

Maintenance 73

Routine Maintenance Overview Checklist.............................................................................................74

Other Maintenance Tasks.......................................................................................................................77

Daily Inspections....................................................................................................................................78

Clean the Columns.................................................................................................................................79

Prevent Rust...........................................................................................................................................80

Maintain Airmount Pressures.................................................................................................................82

Label Inspection.....................................................................................................................................84

Adjust the Hydraulic Locks....................................................................................................................84

Lubricate the Crosshead Locking Bolts.................................................................................................88

Aligning the Force Transducer...............................................................................................................89

Required Equipment...................................................................................................................89

Align the Force Transducer........................................................................................................89

Series 111 Accumulator: Maintenance Overview..................................................................................93

Series 111 Accumulator: Check and Change Precharge Pressure..........................................................95

Equipment..................................................................................................................................95

Prerequisites...............................................................................................................................95

Check the Precharge Pressure....................................................................................................96

4 MTS Landmark™ Tabletop Load Units Product Information

Change the Precharge Pressure..................................................................................................98

Decrease Pressure...........................................................................................................98

Increase Pressure ...........................................................................................................98

Actuator..................................................................................................................................................99

Change the HSM Filter........................................................................................................................100

Change the HSM Filter............................................................................................................101

252 Servovalve.....................................................................................................................................102

Replacing the Servovalve Filter Element.................................................................................102

Replace the Servovalve Filter Element....................................................................................102

Adjusting the Mechanical Null.................................................................................................105

Adjust the Mechanical Null......................................................................................................105

Performing Sensor Calibration.............................................................................................................108

Decommissioning 109

Decommission the System...................................................................................................................110

Declarations 113

Declaration of Conformity...................................................................................................................114

Declaration of Incorporation................................................................................................................117

MTS Landmark™ Tabletop Load Units Product Information 5

Technical Support

How to Get Technical Support

Start with your manuals

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
information.

Technical support methods

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.

Web site

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 Presence > Choose a Region

www.mts.com > Contact Us (upper-right corner) > In the Subject field, choose
To escalate a problem; Problem Submittal Form

Worldwide: [e-mail]-mail

Europe: [e-mail]

Worldwide: 1 800 328 2255 - toll free in U.S.; [phone] - outside U.S.Telephone

Europe: [phone], International toll free in Europe

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

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

MTS Landmark™ Tabletop Load Units Product Information 7

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

Know information from prior technical assistance

If you have contacted MTS about this problem before, we can recall your file based on the:

• 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 computer information

For 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 where the application resides

• Current status of hard-drive fragmentation

• Connection status to a corporate network

Know relevant software information

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

8 MTS Landmark™ Tabletop Load Units Product Information

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:

• Electrodynamic material test system

• Electromechanical material test system

• Hydromechanical material test system

• Vehicle test system

• Vehicle component test system

• Aero test system

Be prepared to troubleshoot

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.

Write down relevant information

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.

MTS Landmark™ Tabletop Load Units Product Information 9

After you call

MTS logs and tracks all calls to ensure that you receive assistance for your 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.

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.

You can access the Problem Submittal Form at www.mts.com > Contact Us (upper-right corner) > In the

Subject field, choose To escalate a problem; Problem Submittal Form

10 MTS Landmark™ Tabletop Load Units Product Information

Preface

Before You Begin

Safety first!

Before you use your MTS product or system, read and understand the 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.

Controller and application software manuals are typically included on the software CD distribution disc(s).

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. (for
general safety information, see the safety information provided with your system.)

Danger:

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.

MTS Landmark™ Tabletop Load Units Product Information 11

Warning:

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:

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.

Other special text conventions

Important:

Important notices provide information about your system that is essential to its proper
function. While not safety-related, if the important information is ignored, test results may
not be reliable, or your system may not operate properly.

Note:

Notes provide additional information about operating your system or highlight easily
overlooked information.

Recommended:

Recommended notes provide a suggested way to accomplish a task based on what MTS
has found to be most effective.

Tip:

Tips provide helpful information or a hint about how to most efficiently accomplish a task.

Access:

Access provides the route you should follow to a referenced item in the software.

Example:

Examples show specific scenarios relating to your product and appear with a shaded
background.

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 not necessarily represent
your actual system configuration, test application, or software.

Electronic manual conventions

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.

12 MTS Landmark™ Tabletop Load Units Product Information

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.

MTS Landmark™ Tabletop Load Units Product Information 13

Safety

Topics:

•

General Safety Practices.......................................................................................................................16

•

Safety Practices Before Operating the System.....................................................................................16

•

Safety Practices While Operating the System ......................................................................................20

•

Load Unit Hazard Labels.......................................................................................................................22

MTS Landmark™ Tabletop Load Units Product Information 15

Safety

General Safety Practices

If you have system related responsibilities (that is, if you are an operator, service engineer, or maintenance
person), you should study this manual carefully before you attempt to perform any test system procedure.

You should receive training on this system or a similar system to ensure a thorough knowledge of your
equipment and the safety issues that are associated with its use. In addition, you should gain an understanding
of system functions by studying the other manuals supplied with your test system. Contact MTS for information
about the content and dates of training classes that are offered.

It is very important that you study the following safety information to ensure that your facility procedures and
the system’s operating environment do not contribute to or result in a hazardous situation. Remember, you
cannot eliminate all the hazards associated with this system, so you must learn and remain aware of the
hazards that apply to your system at all times. Use these safety guidelines to help learn and identify hazards
so that you can establish appropriate training and operating procedures and acquire appropriate safety
equipment (such as gloves, goggles, and hearing protection).

Each test system operates within a unique environment which includes the following known variables:

• Facility variables (facility variables include the structure, atmosphere, and utilities)

• Unauthorized customer modifications to the equipment

• Operator experience and specialization

• Test specimens

Because of these variables (and the possibility of others), your system can operate under unforeseen
circumstances that can result in an operating environment with unknown hazards.

Improper installation, operation, or maintenance of your system can result in hazardous conditions that can
cause death, personal injury, or damage to the equipment or to the specimen. Common sense and a thorough
knowledge of the system’s operating capabilities can help to determine an appropriate and safe approach to
its operation.

Observe the prescribed safety practices before and during system operation.

It is the user’s responsibility to take the machine out of service and contact MTS Service if discrepancies in
system operation are found.

Safety Practices Before Operating the System

Before you apply power to the test system, review and complete all of the safety practices that are applicable
to your system. The goal, by doing this, is to improve the safety awareness of all personnel involved with the
system and to maintain, through visual inspections, the integrity of specific system components.

Read all manuals

Study the contents of this manual and the other manuals provided with your system before attempting to
perform any system function for the first time. Procedures that seem relatively simple or intuitively obvious
can require a complete understanding of system operation to avoid unsafe or dangerous situations.

16 MTS Landmark™ Tabletop Load Units Product Information

Safety

Locate lockout/tagout points

Know where the lockout/tagout point is for each of the supply energies associated with your system. This
includes the hydraulic, pneumatic, electric, and water supplies (as appropriate) for your system to ensure
that the system is isolated from these energies when required.

Know facility safe procedures

Most facilities have internal procedures and rules regarding safe practices within the facility. Be aware of
these safe practices and incorporate them into your daily operation of the system.

Locate Emergency Stop buttons

Know the location of all the system Emergency Stop buttons so that you can stop the system quickly in an
emergency. Ensure that an Emergency Stop button is located within close proximity of the operator at all
times.

Know controls

Before you operate the system for the first time, make a trial run through the operating procedures with the
power off. Locate all hardware and software controls and know what their functions are and what adjustments
they require. If any control function or operating adjustment is not clear, review the applicable information
until you understand it thoroughly.

Have first aid available

Accidents can happen even when you are careful. Arrange your operator schedules so that a properly trained
person is always close by to render first aid. In addition, ensure that local emergency contact information is
posted clearly and in sight of the system operator.

Know potential crush and pinch points

Be aware of potential crush and pinch points on your system and keep personnel and equipment clear of
these areas.

An important consideration for servohydraulic systems is that when power is interrupted, it is likely that stored
accumulator pressure will persist for some time within the system. In addition, it is likely that as stored energy
dissipates, gravity will cause portions of the system to move.

Be aware of component movement with hydraulics off

For hydraulic systems, be aware that mechanical assemblies can shift or drift due to changes within hydraulic
hardware when hydraulics are turned off. This non-commanded movement is because oil can transfer between
the pressure and return ports and across internal components of the hydraulic hardware. Be aware that this
can happen and clear the area around the mechanical assemblies when hydraulics are turned off.

Know electrical hazards

When the system electrical power is turned on, minimize the potential for electrical shock hazards. Wear
clothing and use tools that are properly insulated for electrical work. Avoid contact with exposed wiring or
switch contacts.

Whenever possible, turn off electrical power when you work on or in proximity to any electrical system
component. Observe the same precautions as those given for any other high-voltage machinery.

Make sure that all electrical components are adequately grounded. Grounds must remain connected and
undisturbed at all times.

MTS Landmark™ Tabletop Load Units Product Information 17

Safety

Ensure Correct Cable Connection

If a system cable has been disconnected, ensure that you establish the correct cable-to-connector relationship
during reconnection. Incorrect cable connections can result in improper servo loop phasing or an open servo
loop condition, either of which can cause unstable or unexpected and potentially dangerous system motions.
Verify the correct cable-to-connector relationship by observing the cable and connector labeling and the
system wiring schematics.

Keep bystanders safely away

Keep bystanders at a safe distance from all equipment. Never allow bystanders to be in close proximity of
specimens or equipment while the test is running.

Wear proper clothing

Do not wear neckties, shop aprons, loose clothing or jewelry, or long hair that could get caught in equipment
and result in an injury. Remove loose clothing or jewelry and restrain long hair.

Remove flammable fluids

Remove flammable fluids from their containers or from components before you install the container or
component. If desired, you can replace the flammable fluid with a non-flammable fluid to maintain the proper
proportion of weight and balance.

Know compressed gas hazards

Your system may contain accumulators that require a high-pressure gas precharge (pressures that exceed
138 bar [2000 psi]). High-pressure devices are potentially dangerous because a great amount of energy is
available in the event of an uncontrolled expansion or rupture.

Observe the following safety practices when you work with high-pressure air or gases:

• When you charge an accumulator, follow all the charging instructions provided in the appropriate product
information manuals. When precharging accumulators, properly identify the type of gas to be used and
the type of accumulator to be precharged.

• Use only dry-pumped nitrogen to precharge nitrogen-charged accumulators. (Dry-pumped nitrogen can
also be labeled “oil pumped” or “dry water pumped.”) Do not use compressed air or oxygen for precharging:
the temperature increase caused by rapid gas compression can result in highly explosive conditions when
hydraulic fluid is in the presence of oxygen or compressed air.

• Always follow the recommended bleeding procedures before you remove or disassemble components
that contain pressurized gas. When you bleed a gas or remove a fitting, hose, or component that contains
a gas, remember that many gases cannot support life. Therefore, as the ratio of released gas to oxygen
increases, so does the potential for suffocation.

• Wear appropriate safety devices to protect your hearing. Escaping air or gas can create a noise level that
can damage your hearing.

• Ensure that all pressurized air or gas is bled out of a pneumatic or gas-charged device before you start
to disassemble it. A thorough understanding of the assembly and its pressurized areas is necessary before
you undertake any maintenance. Refer to the appropriate product information for the correct bleeding
procedure.

It may not be obvious or intuitive which bolts or fittings are used to restrain a pressurized area. On some
assemblies, you must remove a cover plate to gain access to the structural bolts. Sometimes, to protect
you from a rapid release of trapped gases, a small port is exposed when you remove this cover plate.
Exposing this port ensures that the gas precharge is fully bled before disassembly. However, this is not
the recommended procedure for bleeding a pneumatic or gas-charged device, because it can expose you

18 MTS Landmark™ Tabletop Load Units Product Information

Safety

to the dangers of escaping compressed gas and particulates that are expelled from the chamber or around
the seals. Do not assume that cover plates and ports are installed in all the critical locations.

Consult MTS when in doubt about the safety or reliability of any system-related procedure or modification
that involves devices that contain any type of compressed gas.

Check bolt ratings and torques

To ensure a reliable product, fasteners (such as bolts and tie rods) used in MTS-manufactured systems are
torqued to specific requirements. If a fastener is loosened or the configuration of a component within the
system is modified, refer to the system and component assembly drawings (located on the System
Documentation CD) to determine the correct fastener, fastener rating, and torque. Over torquing or under
torquing a fastener can create a hazardous situation due to the high forces and pressures present in MTS
test systems.

On rare occasions, a fastener can fail even when it is correctly installed. Failure usually occurs during torquing,
but it can occur several days later. Failure of a fastener can result in a high velocity projectile. Therefore, it
is a good practice to avoid stationing personnel in line with or below assemblies that contain large or long
fasteners.

Practice good housekeeping

Keep the floors in the work area clean. Industrial chemicals, such as hydraulic fluid, that are spilled on any
type of floor can result in a dangerous, slippery surface. Do not leave tools, fixtures, or other items not specific
to the test, lying about on the floor, system, or decking.

Protect hoses and cables

Protect electrical cables from spilled fluids and from excessive temperatures that can cause the cables to
harden and eventually fail. Ensure that all cables have appropriate strain relief devices installed at the cable
and near the connector plug. Do not use the connector plug as a strain relief.

Protect all system hoses and cables from sharp or abrasive objects that can cause the hose or cable to fail.
Use a cable cover or cable tray where cables are in traffic locations. Never walk on hoses or cables or move
heavy objects over them. Route hoses and cables away from areas that expose them to possible damage.

Provide proper hydraulic fluid filtration

For hydraulic systems equipped with a non-MTS hydraulic power unit, make sure that hydraulic fluid filtration
is established to maintain fluid cleanliness standards as stated in the Hydraulic Fluid Care Manual (see the
System Documentation CD). Particles present in the hydraulic fluid can cause erratic or poor system response.

Protect accumulators from moving objects

For systems equipped with accumulators, protect accumulators with supports or guards. Do not strike
accumulators with moving objects. This could cause the accumulator(s) to separate from the manifold resulting
in equipment damage and personal injury.

Record changes

If you change any operating procedure, write the change and the date of the change in the appropriate manual.

Provide test area guards

Use protective guards such as cages, enclosures, and special laboratory layouts when you work with hazardous
test specimens (for example, brittle or fragmenting materials or materials that are internally pressurized).

MTS Landmark™ Tabletop Load Units Product Information 19

Safety

Do not exceed the Maximum Supply Pressure

For hydraulic systems and components, make sure that hydraulic supply pressure is limited to the maximum
pressure defined by the system operating limits. Read and review “System Operating Limits” for the system.

Do not disable safety devices

Your system may have active or passive safety devices installed to prevent system operation if the device
indicates an unsafe condition. Do not disable such devices as it may result in unexpected system motion.

Use appropriately sized fuses

Whenever you replace fuses for the system or supply, ensure that you use a fuse that is appropriately sized
and correctly installed. Undersized or oversized fuses can result in cables that overheat and fuses that explode.
Either instance creates a fire hazard.

Provide adequate lighting

Ensure adequate lighting to minimize the chance of operation errors, equipment damage, and personal injury.

Provide adequate ventilation

Make sure work and maintenance areas are adequately ventilated to minimize the risks associated with the
collection of hazardous fumes (such as vaporized hydraulic fluid). This is of special concern in confined areas
where hydraulic equipment is operating at high pressure in confined areas.

Provide means to access out-of-reach components

Make sure you can access system components that might be out of reach while standing on the floor. For
example, ladders or scaffolding might be required to reach load cell connectors on tall load units.

Safety Practices While Operating the System

Wear appropriate personal protection

Wear eye protection when you work with high-pressure hydraulic fluid, high-pressure air pressure, breakable
specimens, or when anything characteristic to the specimen could break apart.

Wear ear protection when you work near electric motors, pumps, or other devices that generate high noise
levels. This system may create sound pressure levels that exceed 70 dbA during operation.

Wear appropriate protection (gloves, boots, suits, respirators) whenever you work with fluids, chemicals, or
powders that may irritate or harm the skin, respiratory system, or eyes.

Provide test area enclosures

Use protective enclosures such as cages or shields, and special laboratory layouts when you work with
hazardous test specimens (for example, brittle or fragmenting materials or materials that are internally
pressurized).

Customer must evaluate risks due to ejected parts or materials from the test specimens. If the MTS Test Area
Enclosure option is not selected by the customer, then for protection against ejected parts or materials from
test specimens and to control access to the machinery, the Customer must provide a Test Area Enclosure
to protect personnel.

20 MTS Landmark™ Tabletop Load Units Product Information

Safety

Specimen temperature changes

During cyclic testing, the specimen temperature can become hot enough to cause burns. Wear personal
protection equipment (gloves) when handling specimens.

Handle chemicals safely

Whenever you use or handle chemicals (for example, hydraulic fluid, batteries, contaminated parts, electrical
fluids, and maintenance waste), refer to the appropriate MSDS documentation for that material and determine
the appropriate measures and equipment required to handle and use the chemical safely. Ensure that the
chemical is disposed of appropriately.

Know servohydraulic system interlocks

Interlock devices should always be used and properly adjusted. Interlock devices are designed to minimize
the chance of accidental damage to the test specimen or the equipment. Test all interlock devices for proper
operation immediately before a test. Do not disable or bypass any interlock devices as doing so could allow
hydraulic pressure to be applied regardless of the true interlock condition. The Reset/Override button is a
software function that can be used to temporarily override an interlock while attempting to start the hydraulic
power unit and gain control of the system.

Know system limits

Never rely on system limits such as mechanical limits or software limits to protect you or any personnel.
System limits are designed to minimize the chance of accidental damage to test specimens or to equipment.
Test all limits for proper operation immediately before a test. Always use these limits and adjust them properly.

Do not disturb sensors

Do not bump, wiggle, adjust, disconnect, or otherwise disturb a sensor (such as an accelerometer or
extensometer) or its connecting cable when hydraulic pressure is applied.

Ensure secure cables

Ensure that all cable connections (electrical supply, control, feedback, sensor, communications, and so forth)
are either locking type, or are secured, to ensure that they cannot be disconnected by a simple act. Do not
change any cable connections when electrical power or hydraulic pressure is applied. If you attempt to change
a cable connection while the system is in operation, an open control loop condition can result. An open control
loop condition can cause a rapid, unexpected system response which can result in severe personal injury,
death, or damage to equipment. Also, ensure that all cables are connected after you make any changes in
the system configuration.

Stay alert

Avoid long periods of work without adequate rest. In addition, avoid long periods of repetitious, unvarying, or
monotonous work because these conditions can contribute to accidents and hazardous situations. If you are
too familiar with the work environment, it is easy to overlook potential hazards that exist in that environment.

Contain small leaks

Do not use your fingers or hands to stop small leaks in hydraulic or pneumatic hoses. Substantial pressures
can build up, especially if the hole is small. These high pressures may cause the oil or gas to penetrate your
skin, causing painful and dangerously infected wounds. Turn off the hydraulic supply and allow the hydraulic
pressure to dissipate before you remove and replace the hose or any pressurized component.

Stay clear of moving equipment/avoid crush points

Stay clear of mechanical linkages, connecting cables, and hoses that move because you may get pinched,
crushed, tangled, or dragged along with the equipment. High forces generated by the system can pinch, cut,

MTS Landmark™ Tabletop Load Units Product Information 21

Safety

or crush anything in the path of the equipment and cause serious injury. Stay clear of any potential crush
points. Most test systems can produce sudden, high-force motion. Never assume that your reactions are fast
enough to allow you to escape injury when a system fails.

Know the causes of unexpected actuator motions

The high force and velocity capabilities of MTS actuators can be destructive and dangerous (especially if
actuator motion is unexpected). The most likely causes of unexpected actuator response are operator error
and equipment failure due to damage or abuse (such as broken, cut, or crushed cables and hoses; shorted
wires; overstressed feedback devices; and damaged components within the servocontrol loop). Eliminate
any condition that could cause unexpected actuator motion.

Do not use RF transmitters

Keep radio frequency (RF) transmitters away from the workstation computers, remote terminals, and electronics
consoles. Intense RF fields can cause erratic operation of the more sensitive circuits in the system.

Load Unit Hazard Labels

Two sets of labels are used for the load frames: one set for North America and one set for rest of the world.

Hazard Labels North America (part number 100-164-553)

22 MTS Landmark™ Tabletop Load Units Product Information

Hazard Labels Rest of World (part number 100-164-565)

DescriptionIcon

Failure to follow operating instructions can cause
death or serious injury.

Read and understand the operator’s manual before
using this machine.

Safety

Moving parts can crush and cut.

Keep hands clear while operating machine.

Pushing or striking load frame may cause it to tip over.

Read the operator’s manual for moving instructions.

MTS Landmark™ Tabletop Load Units Product Information 23

Safety

DescriptionIcon

Flying debris and loud noise hazard.

Wear ear and eye protection.

Hydraulic pressure beyond rated working pressure
can rupture components, cause severe personal
injury, and damage equipment.

Do not exceed 21 MPa (3000 psi) rated working
pressure.

Hazard Label for HSM Needle Valve Adjustment

DescriptionIcon

The HSM needle valve is factory adjusted and should
not be adjusted in the field except by MTS Field
Service Engineers.

24 MTS Landmark™ Tabletop Load Units Product Information

Hazard Label for HSM Needle Valve Adjustment

Safety

DescriptionIcon

The HSM needle valve is factory adjusted and should
not be adjusted in the field except by MTS Field
Service Engineers.

MTS Landmark™ Tabletop Load Units Product Information 25

Introduction

Topics:

•

Overview................................................................................................................................................28

•

EU Declarations.....................................................................................................................................29

•

Component Description.........................................................................................................................31

•

Functional Description...........................................................................................................................33

•

Series 661 Force Transducers...............................................................................................................34

•

Series 662 Force Transducers...............................................................................................................36

•

Specifications.........................................................................................................................................37

MTS Landmark™ Tabletop Load Units Product Information 27

Introduction

Overview

This manual documents Series 370 Tabletop Load Units. These small load units are available in the following
configurations:

• The axial load unit has an actuator that applies linear forces to specimens.

• The axial-torsional load unit combines an axial actuator with a torsional actuator to simultaneously apply
axial and torsional forces to specimens.

• The 100 Hz elastomer load unit is configured specifically for characterizing the dynamic properties of
elastomeric materials and components.

28 MTS Landmark™ Tabletop Load Units Product Information

MTS Landmark Tabletop Load Units

DescriptionItem

Axial1

Axial-Torsional2

Note: Load units are shown with optional grips, fixtures, and accessories.3

What you need to know

MTS Systems Corporation assumes that you know how to use your controller. For information about performing
any controller-related step in this manual's procedure, see the appropriate manual. You are expected to know
how to perform the following procedures:

• Turn hydraulic pressure on and off.

• Select a control mode.

• Adjust the actuator position.

Introduction

• Zero a sensor signal.

• Zero a sensor output.

• Use your grips and fixtures.

• Define a simple test.

• Run a test.

Related products

The Series 370 Tabletop Load Unit includes several other products. For product-specific information and
maintenance procedures, see the following product information manuals.

•

The Series 111 Accumulator Product Information manual (MTS part number 011-553-304)

•

The Series 252 Servovalve Product Information manual (MTS part number 011-182-906)

EU Declarations

The load units, controllers, and optional equipment are supplied with Product Information manuals that allow
them to be assembled and integrated to work as assemblies of machinery.

The customer must evaluate risks due to ejected parts or materials from the test specimens. If the test area
enclosure option is not selected by the customer, then for protection against ejected parts or materials from
test specimens and to control access to the machinery, the customer must provide a test area enclosure.

MTS Landmark™ Tabletop Load Units Product Information 29

Introduction

EC Declaration of Conformity (Machinery Directive 2006/42/EC Annex II 1A)

The load units are used for testing materials and components and can perform tension, compression, fatigue
and fracture mechanics tests. The testing materials and components (test specimens) are supplied by
customers or end users.

A combination of one each of an MTS load unit AND one each of an MTS Controller constitute machinery
that can be used for specific application(s) as given in this load unit Product Information manual. If the load
unit is supplied with an MTS Controller, the Declaration of Conformity is supplied with the machinery; an
example of the Declaration of Conformity is provided at the end of this manual.

Optional equipment such as hydraulic service manifolds, a hydraulic power unit, grips, fixtures, extensometers,
furnaces, ovens and environmental chambers, and so forth can be used with the machinery. MTS will supply
Product Information manuals for optional equipment that allow such equipment to be assembled correctly
with the load unit and controller. This will allow the completed system assembly of individual equipment to
be controlled as one final machinery.

Declaration of Incorporation (Machinery Directive 2006/42/EC Annex II 1B)

If the load unit is supplied by itself, MTS will only supply a Declaration of Incorporation with the product; an
example of the Declaration of Incorporation is provided at the end of this manual. Whenever a Declaration
of Incorporation is supplied, it is the responsibility of the customer to perform the Machinery Directive Conformity
Assessment procedures and ensure that the complete assembly of machinery sub-systems (load unit,
controller, and optional equipment such as hydraulic service manifolds, hydraulic power unit, grips, fixtures,
extensometers, furnaces, ovens and environmental chambers, and so forth) conforms to the requirements
of Machinery Directive 2006/42/EC and other applicable EC Directives. This will require the customer to affix
the CE Marking on the system assembly and to complete the EC Declaration of Conformity before putting
the machinery into service.

30 MTS Landmark™ Tabletop Load Units Product Information

Component Description

Introduction

Rear View of a Load Unit (Axial-Torsional model shown)

Component Descriptions

DescriptionComponentItem

Encoder1

Measures the angle of the rotary actuator’s travel. The encoder
is coupled to the rotary actuator.

MTS Landmark™ Tabletop Load Units Product Information 31

Introduction

DescriptionComponentItem

Rotary actuator2

LVDT3

Crosshead lifts4

Crosshead5

Clamp ring6

Force transducer7

Accumulators9

Applies rotational forces to a specimen. The rotary actuator is
coupled to the linear actuator for axial-torsional load units.

Measures the displacement of the linear actuator’s travel. The
linear variable displacement transducer (LVDT) is located inside
the actuator.

Raise and lower the crosshead hydraulically to accommodate
different specimen sizes. The lifts are small hydraulic actuators.

Moves up and down the column to accommodate different sized
specimens and fixtures. The crosshead is stiff and light weight;
it is one end of the force train.

Provides additional protection against the crosshead slipping.
The clamp ring can be positioned anywhere along one of the
columns.

Measures the forces applied to specimen. It is a strain gage type,
accurate in both dynamic and static tests. Both axial and
axial-torsional force transducers are available.

Dampen the load unit’s natural frequency to about 20 Hz.Isolation pads8

Store hydraulic fluid under pressure to increase the actuator’s
response time. One accumulator connects to the pressure line;
the other to the return line.

13

Manifold10

Servovalves11

Linear actuator12

Control panel

Grip controls

Crosshead lift
control

Emergency stop

Serves as the junction point between the hydraulic power unit
(HPU), accumulators, servovalve, and actuator. The manifold is
mounted to the crosshead. It is also a hydraulic circuit that
connects the hydraulic components.

Control both the amount and the direction of fluid entering the
actuator using a high response valve. They determine how fast
the actuator can move. A servovalve is required for each actuator.

Applies axial forces to specimens. The actuator is a hydraulically
powered device that provides linear displacement of (or forces
into) a specimen. Grips and fixtures can be mounted to the
actuator.

The Emergency Stop button is standard; the other controls are
optional.

Clamp and unclamp hydraulically controlled grips during
specimen installation and removal.

Controls the crosshead lifts to raise and lower the crosshead
hydraulically.

Removes hydraulic pressure from the load unit and issues an
interlock signal to the controller to stop the test program.

32 MTS Landmark™ Tabletop Load Units Product Information

Functional Description

The load unit is a stand-alone testing structure. It consists of the following components:

• Load frame

• Crosshead lifts

• Manifold

• Actuators

• Servovalves

• Accumulators

• Two or more transducers

Load frame

Introduction

The load frame is the basic structure. Two columns allow a crosshead to be moved up or down to accommodate
different size specimens and fixtures. The crosshead is one of the two reaction masses in the force train and
the base of the load frame is the other. A control panel lets you perform specimen installation procedures.

Crosshead

The crosshead has the actuator, servovalve, manifold, and accumulators mounted to it. It usually has a grip
or special fixtures attached to the actuator of the crosshead to install one end of the test specimen.

The crosshead can be positioned anywhere along the load frame columns. This lets you test specimens of
different lengths. It can be moved along the column manually or with hydraulic lifts. When the crosshead is
in an appropriate test position, it is manually clamped to that position.

Manifold

The actuator manifold acts as the hydraulic interface between the HPU and the components mounted to the
manifold (actuator, servovalves, and accumulators) of the load unit. It contains the required hydraulic porting
and plumbing to accommodate the various hydraulically controlled components. The manifold can also control
the hydraulic pressure to the load unit.

• Actuator: The linear actuator is located in the middle of the crosshead. It is a hydraulically powered piston
that applies displacement of (or force into) a specimen. It can apply equal power in tension and compression.
One end of the test specimen is installed into a fixture mounted to the end of the actuator rod.

The rotary actuator is coupled to the linear actuator. It is a hydraulically powered piston that applies angular
displacement of (or torsional force into) a specimen.

• Servovalves: The servovalve regulates the rate and direction of hydraulic fluid flow to and from a hydraulic
actuator. The load unit usually includes a Series 252 Servovalve. Each actuator requires a servovalve.

• Accumulators: The accumulators suppress line-pressure fluctuations. The load unit includes a pressure-line
accumulator to provide fluid storage so that a constant line pressure can be maintained at the servovalves
for maximum performance. The return-line accumulator minimizes return-line pressure fluctuations.

Pressure control

The load unit can be configured for several pressure configurations:

MTS Landmark™ Tabletop Load Units Product Information 33

Introduction

• The free flow configuration passes the hydraulic pressure from the HPU (or hydraulic service manifold)
through the manifold to the hydraulic components. This configuration has no pressure controls; the hydraulic
pressure is controlled by the HPU.

• The on/off configuration applies or removes high-hydraulic pressure to the load unit.

• The high/low/off configuration applies high or low hydraulic pressure to the load unit.

• The proportional valve configuration applies high or low hydraulic pressure to the load unit using a
proportional valve to ramp the pressure transitions.

Transducers

The axial load unit includes a force transducer and an LVDT to measure linear forces and displacements.
The axial-torsional load unit includes an axial-torsional force transducer, an LVDT, and an encoder.

• Force: The force transducer (also called load cell or force sensor) measures the amount of tension or
compression applied to it. It has four strain gages that form a balanced Wheatstone bridge. When forces
are applied to the bridge, it becomes unbalanced and produces an electrical signal that is proportional to
the force applied to it. The axial-torsional transducer includes two Wheatstone bridges; one to measure
linear forces and the other to measure rotational forces. Force transducers are resistive devices and
require a DC conditioner to process the signals from each Wheatstone bridge.

• LVDT: The LVDT measures the linear actuator’s travel. The LVDT consists of a transformer with one
primary and two secondary coils wound on a common cylinder. The coil is stationary inside the actuator.
A core is attached to the piston rod of the actuator. As it moves inside the coil, it produces an electrical
signal that represents the position of the piston rod. The phase of the signal indicates the direction the
actuator rod is moving. An LVDT requires an AC conditioner to process the signal.

• Encoder: The encoder measures the amount of rotation produced by the rotary actuator. It is coupled to
the rotary actuator. The absolute encoder produces a unique digital code for each distinct angle of the
shaft.

Series 661 Force Transducers

The force transducer commonly used with the axial tabletop Series 370 Load Unit is a Series 661 Force
Transducer. There is no manual for the force transducer. The following table provides the specifications for
the force transducers.

SpecificationParameter

Static overload capacity 150% of rating.Capacity

15 kNModel 661.19H-03

25 kNModel 661.19H-04

20 V DCMaximum excitation input

Axial = 350ΩBridge resistance

0.05% of full scaleHysteresis

0.05% of full-scale axial typicalNonlinearity

34 MTS Landmark™ Tabletop Load Units Product Information

Model 661.19H-04

Dimensions

Introduction

SpecificationParameter

0.00044% of full scale/°C (0.0008%/°F)Temperature

-54°C to 93°C (-65°F to 200°F)Usable range

-18°C to 66°C (0°F to 150°F)Compensated range

1.0 mV/VOutput

2.0 mV/VModel 661.19H-03

Thread SizeLoad CapacityModel

M12 x 1.25 mm15 kN (3.3 kip)661.19H-03

M12 x 1.25 mm25 kN (5.5 kip)661.19H-04

The following dimensions are rounded off to the nearest millimeter.

Series 661 Force Transducer Dimensions

DimensionsItem

104.6 mm (4.12 in)A

31.8 mm (1.25 in)B

0.8 mm (0.03 in)C

66.5 mm (2.62 in)D

32.0 mm (1.3 in)E

6.4 mm (0.25 in)F

MTS Landmark™ Tabletop Load Units Product Information 35

Introduction

DimensionsItem

5.1 mm (0.20 in)G

DepthH

Near Side: 25.4 mm (1.00 in)

Far Side: 20.3 mm (0.80 in)

63.5 mm (2.50 in)I

Series 662 Force Transducers

The force transducer commonly used with the axial-torsional tabletop Series 370 Load Unit is a Series 662
Force Transducer. There is no manual for the force transducer. The following table provides the specifications
for the force transducers.

SpecificationParameter

Axial-TorsionalCapacity

15 kN (150 N·m)Model 662.20HD-04

25 kN (250 N·m)Model 662.20H-05

15 V DCMaximum excitation input

350Ω Axial, 700Ω TorsionalBridge resistance

0.15% of full scaleHysteresis

0.3% of full-scale axial, 0.15% of full-scale torsionalNonlinearity

0.0036% of reading/°C (0.0020%/°F)Temperature

-46°C to 93°C (-50°F to 200°F)Usable range

21°C to 77°C (70°F to 170°F)Compensated range

1.5 mV/V at full-scale load (662.20-04)Output

2 mV/V at full-scale load (662.20-05)

Axial Load CapacityModel

Capacity

36 MTS Landmark™ Tabletop Load Units Product Information

Thread SizeAxial-Torsional Load

M8 x 1.25 mm150 N·m15 kN662.20H-04

M10 x 1.50 mm250 N· m25 kN662.20H-05

Dimensions

The following dimensions are rounded off to the nearest millimeter.

Series 662 Force Transducer Dimensions

Introduction

Item

Dimensions

Model 662.20H-04

Dimensions

Model 662.20H-05

158.8mm (6.25 in)111.3 mm (4.38 in)A

146.0 mm (5.75 in)101.6 mm (4.00 in)B (both ends)

120.7 mm (4.75 in)78.7 mm (3.10 in)C [bolt circle diameter (both ends)]

165.1 mm (6.50 in)127.0 mm (5.00 in)D

88.9 mm (3.501 in)55.9 mm (2.201 in)E (both ends)

9.6 mm (0.18 in)6.4 mm (0.25 in)F

6.4 mm (0.25 in)6.4 mm (0.25 in)G

Specifications

Force ratings, weights, dimensions, and operating specifications can be found in the MTS Landmark Testing
Solutions brochure on the MTS web site (www.mts.com); search keyword “landmark testing solutions.”

MTS Landmark™ Tabletop Load Units Product Information 37

Installation

Topics:

•

About Installation...................................................................................................................................40

•

Lifting and Moving the Load Unit...........................................................................................................40

•

Connecting Cables................................................................................................................................48

•

Connect Hydraulics................................................................................................................................50

•

Unlock the Crosshead...........................................................................................................................51

MTS Landmark™ Tabletop Load Units Product Information 39

Installation

About Installation

This section provides information on load unit installation. After installation is complete, it is recommended
that you verify operation before putting the load unit into service and start running tests.

Lifting and Moving the Load Unit

This section describes how to lift and move the Series 370 Load Unit.

Overview

You will need a fork lift or overhead crane capable of lifting the load unit. Ensure that the lifting equipment
can accommodate the weight of the load unit (see the following table).

Warning:

The load unit is heavy.

The weight of the load unit can seriously hurt you and damage your load unit.

Do not allow the load unit to drop or topple.

Make sure that your chains, slings, and crane have a working capacity greater than the load
unit’s weight.

Make sure that the lifting hoist rings are tight.

Make sure that the crosshead locking bolts are fully tightened.

Lift the load unit only high enough to clear its pallet.

Operate the crane smoothly to prevent breaking shocks to the sling.

Note:

The following weight specifications are for lifting and moving purposes. The weight of accessories and
special fixtures must be added. The actual shipping weight must be determined by a scale.

Approximate Weights of Load Units

Model

Standard Height

Extended Height

Approximate Weight

40 MTS Landmark™ Tabletop Load Units Product Information

Approximate Weight

286 kg (630 lb)248 kg (547 lb)Axial

334 kg (735 lb)296 kg (652 lb)Axial-Torsional

Approximate Weights of Load Units

Installation

Model

Base Mount

Approximate Weight

Lift and Move the Load Unit

1. Unpack the load unit.

a) Remove the load unit from the shipping container (if used).

b) Remove any protective wrapping.

c) Use a clean cloth to wipe dust or debris deposited during shipment.

2. Inspect the load unit for shipping damage. Look for the following:

• Scratches in the load unit or lift cylinder columns

Crosshead Mount

Approximate Weight

815 kg (1795 lb)631 kg (1390 lb)370.10

1091 kg (2405 lb)871 kg (1920 lb)370.25

1756 kg (3870 lb)1563 kg (3445 lb)370.50

• Damaged electrical connections

• Damaged hydraulic connections

• Dents and other structural damage

• Torn, kinked, or breaking hoses

Report any damage found to both the carrier and MTS. In the U.S. and Canada, call the MTS Call Center
at 1-800-328-2255. Elsewhere, contact your local MTS office.

3. Lock the crosshead.

The crosshead should already be locked into position. Ensure that the manual crosshead locking bolts
are fully tightened. The load unit is available with hydraulically or manually locked crossheads.

MTS Landmark™ Tabletop Load Units Product Information 41

Installation

Lock the Crosshead

DescriptionItem

190 N · m (140 lbf · ft)1

Lock the Crosshead

DescriptionItem

Hydraulically Locked Crossheads1

Manually Locked Crossheads2

Manual locks not available on Models 370.25 and 370.50.3

4. Before you move the load unit, check the following:

• The floor where the load unit will sit can bear its weight.

• The path to where the load unit will sit is clear and uncluttered.

• The area where the load unit will sit is clean and well lit, with all hoses and cables moved out of the

way.

5. Move the load unit slowly to its installation site.

Move the load unit only with slings or chains using an overhead lifting device. Lift the load unit only as
high as necessary.

42 MTS Landmark™ Tabletop Load Units Product Information

Installation

Lift Point Locations

DescriptionItem

M20 X 2.50 mm Holes for Swivel Hoist Rings (supplied for lifting)1

Slings2

Warning:

Airmounts can be overinflated and then explode.

You can be seriously hurt if an airmount explodes, sending fragments flying.

Only inflate airmounts that have the full weight of the load unit resting on them. Never inflate
an airmount above 0.41 MPa (60 psi). Check airmount pressures with an accurate pressure
gage.

Each airmount's inflated height—measured from the floor to the bottom of the load unit’s
leg—should be 57–63 mm (2.25–2.5 in).

MTS Landmark™ Tabletop Load Units Product Information 43

Installation

The load unit can be moved on its pallet with a fork lift, or with its lifting hoist rings (actuator integral to the
base), or with slings (actuator integral to the crosshead) using an overhead lifting device. Lift the load unit
only as high as necessary.

Lift Point Locations

DescriptionItem

Hoist Rings1

Slings2

44 MTS Landmark™ Tabletop Load Units Product Information

Installation

Warning:

Airmounts can be overinflated and then explode.

You can be seriously hurt if an airmount explodes, sending fragments flying.

Only inflate airmounts that have the full weight of the load unit resting on them. Never inflate
an airmount above 0.55 MPa (80 psi). Check airmount pressures with an accurate pressure
gage.

Each airmount's inflated height—measured from the floor to the bottom of the load unit’s
leg—should be 83–89 mm (3.25–3.5 in).

6. Gently lower the load unit onto the four isolation pads or airmounts.

a) If your load unit has isolation pads, and the load unit does not sit level, install stock metal shims between

the pads and the floor.

b) If your load unit has airmounts, inflate each airmount in 5 mm (0.20 in) steps to level the load unit.

c) Check the airmounts’ pressures often to make sure that they are not inflated above:

0.41 MPa (60 psi) for the tabletop load unit.

0.55 MPa (80 psi) for the floor standing load unit.

d) Check the airmounts’ inflated heights to make sure that they are all between:

57 and 63 mm (2.25 and 2.5 in) for the tabletop load unit.

83 and 88 mm (3.25 and 3.5 in) for the floor standing load unit.

e) Adjust the air pressure to level the load unit.

Isolation Pad or Airmount Adjustment

DescriptionItem

Airmount Foot Support1

MTS Landmark™ Tabletop Load Units Product Information 45

Installation

DescriptionItem

Isolation Pads2

Load Unit3

57 - 63 mm (2.25–2.5 in)4

83 - 89 mm (3.25–3.5 in)

0.41 MPa (60 psi)5

0.55 MPa (80 psi)

Install shims to level.6

7. Remove the slings/chains.

8. Secure the load unit.

The load unit must be secured to an adequate platform before it can be operated. The base of tabletop
load units have a threaded hole in each corner (M16 X 2.00 mm).

a) If necessary, drill four mounting holes for the load unit. The load unit hole pattern is shown below.

Tabletop Load Unit Mounting Hole Pattern

b) Position the load unit onto its isolation pads.

c) Align the load unit with the mounting holes. Install the threaded stud into the threaded hole in each

corner of the load unit.

d) Mount the load unit on the workbench using the hardware included with the isolation tie-down kit.

46 MTS Landmark™ Tabletop Load Units Product Information

Installation

Mounting Hardware

DescriptionItem

Jam Nut1

Isolation Pad2

Washer3

Threaded Stud4

Spring5

Self Locking Nut6

9. Contact MTS Systems Corporation to arrange for installation services.

In the U.S. and Canada, call the MTS Call Center at 1-800-328-2255. Elsewhere, contact your local MTS
office.

MTS Landmark™ Tabletop Load Units Product Information 47

Installation

Connecting Cables

Your controller manual should have cabling information about the connections described in this section. Most
controller manuals provide the signal pinouts of the connector, assembly numbers for standard MTS cables,
and cable specifications for cables you may build.

Prerequisite

You must have either a cable assembly drawing of your test system, or you must know the system controller
well enough to determine each type of cable connection.

Cable connections

The following load unit components are connected to the test controller via cables:

• The force transducer (load cell).

• The load unit control panel; the control panel contains the emergency stop and crosshead lock signals.

• The servovalve.

• The actuator manifold. The actuator manifold might include a proportional valve or solenoid valves.
Controllers can have two connectors (one for each HSM type) or one connection that can be configured.
See your controller documentation.

• The displacement sensor (also called an linear variable displacement transducer or LVDT).

• For axial/torsional load units, the encoder (rotational sensor).

Another connection is the ground connection. The ground connection is located on the back of the control
panel. This is usually connected to a chassis ground on a console or the controller chassis.

Low Flow Power Supply

Connect the low flow power supply as shown in the following figure. If the load frame is equipped with a test
area enclosure, the door interlock jumper would be replaced with the cable from the test area enclosure.

48 MTS Landmark™ Tabletop Load Units Product Information

Installation

Note:

Location of the load frame low flow solenoid shown in the figure is typical. Actual location can vary
depending on manifold configuration.

MTS Landmark™ Tabletop Load Units Product Information 49

Installation

Connect the Low Flow Power Supply

DescriptionItem

Main Power In1

To Low Flow Solenoid2

To Load Frame Rear Panel3

Door Interlock Jumper4

Connect Hydraulics

This procedure describes how to connect the load unit to the hydraulic power source. The load unit may be
connected directly to the hydraulic power unit (also called HPU), to hydraulic plumbing in the workplace, or
through a hydraulic service manifold.

50 MTS Landmark™ Tabletop Load Units Product Information

Caution:

Hydraulic fluid must be properly filtered.

Failure to maintain clean hydraulic fluid will lead to poor system performance and expensive
repairs.

MTS supplied HPUs incorporate the necessary filtration. If the source of hydraulic fluid pressure
is customer supplied, it is the customer's responsibility to ensure proper filtration.

Note:

The internal hydraulic connections from the actuator manifold and accessories such as the hydraulic
lifts and locks should already be made.

1. Connect the return line from the HPU to the hydraulic port on the manifold labeled “R”.

2. Connect the pressure line from the HPU to the hydraulic port on the manifold labeled “P”.

3. Connect the drain line(s) to the HPU.

Installation

a) Connect a drain line from the hydraulic port on the manifold (labeled "D") to the HPU.

b) If applicable, connect a drain line from the hydraulic lift/locks and hydraulic grip control to the HPU.

The lift/lock and grip supply drain lines are connected together inside the frame. A short drain hose is
supplied to be connected to a second drain line connected to the HPU.

4. Turn on the HPU and check for any hydraulic pressure leaks.

5. Turn on the actuator manifold (also called a hydraulic service manifold or HSM) and check for hydraulic
leaks in the load unit.

6. If you have hydraulic lifts, bleed the air out of the hydraulic lift cylinders.

Unlock the Crosshead

When the load unit is shipped, the crosshead is clamped to the columns with the manual clamping bolts in
the crosshead.

MTS Landmark™ Tabletop Load Units Product Information 51

Installation

Note:

This procedure only applies to load units equipped with hydraulic crosshead positioning and locks.

Caution:

The crosshead can slowly drift down the columns if the locks are turned off and when hydraulic
pressure is turned off.

The crosshead can damage any test fixtures, grips, and specimen in its path.

Unlock the crosshead only to reposition it. Always lock the crosshead after you have repositioned
it and never leave the crosshead unlocked.

1. Turn on hydraulic pressure.

2. Fully loosen the manual crosshead locking bolts in the order shown in the following figure.

52 MTS Landmark™ Tabletop Load Units Product Information

Loosen the Manual Crosshead Locking Bolts

DescriptionItem

136 N·m (100 lbf·ft)1

271 N·m (200 lbf·ft)2

271 N·m (200 lbf·ft)3

Loosen the Manual Crosshead Locking Bolts

Installation

DescriptionItem

190 N·m (140 lbf·ft)1

3. Cycle the lock control to unclamp, and then reclamp, the crosshead.

4. Use the lock control to unclamp the crosshead. Wait 30 seconds for the pressure in the crosshead locks
to drop to zero.

5. Use the lift control to position the crosshead where you want it.

6. Use the lock control to clamp the crosshead to its current position. Wait 30 seconds for the locks to fully
clamp the columns.

MTS Landmark™ Tabletop Load Units Product Information 53

Operation

Topics:

•

Control Module.......................................................................................................................................56

•

Specimen Installation.............................................................................................................................57

•

Position the Crosshead Manually..........................................................................................................59

•

Move the Crosshead Hydraulically........................................................................................................63

•

Adjust the Grip Clamp Rate...................................................................................................................64

•

Adjust the Grip Clamp Force.................................................................................................................65

•

Handset Control.....................................................................................................................................66

•

Standard Test Area Enclosure Operation..............................................................................................67

•

Test Area Enclosure with Light Curtain..................................................................................................70

MTS Landmark™ Tabletop Load Units Product Information 55

Operation

Control Module

The controls for the Series 370 Load Unit are located on a module mounted to the front of the load unit. The
followingcontrol panel is shown with all available options. The control panel on your load unit might not have
all of these controls depending on the specific configuration.

Series 370 Load Unit Controls

DescriptionControlItem

1

2

4

5

Upper Hydraulic Grip
Controls

Lower Hydraulic Grip
Controls

Grip Pressure Adjust3

Crosshead Lock/Unlock
Control

Crosshead Positioning
Control

Item 1 controls clamping and unclamping the optional upper hydraulic
grip. Item 1A adjusts the upper grip clamping rate. Item 1B is the upper
grip pressure gage.

Item 2 controls clamping and unclamping the optional lower hydraulic
grip. Item 2A adjusts the lower grip clamping rate. Item 2B is the lower
grip pressure gage.

Adjusts the amount of hydraulic pressure to the grips. The adjustment
range is 1–21 MPa (100–3000 psi) or 1–69 MPa (100–10,000 psi). The
highest pressure setting depends on the maximum pressure setting.
Adjust the control clockwise to increase the hydraulic pressure. Use
the pressure gage and the grip manual to determine the necessary
clamping force.

Controls the locking and unlocking of the crosshead. The crosshead
must not be moved while it is clamped.

Controls the movement of the crosshead. The control raises and lowers
the crosshead. The crosshead must not be moved while it is locked.

Emergency Stop6

56 MTS Landmark™ Tabletop Load Units Product Information

Removes the hydraulic power and stops the test program. Press this
button to remove hydraulic power, and twist the switch clockwise to

Operation

DescriptionControlItem

release it. Use the Emergency Stop button to shut down your test if
something unexpected should happen.

7

Actuator Velocity Limiting
Switch

Handset8

Controls actuator velocity. There are two positions: one for reduced
fluid flow to the actuator resulting in slow speed of the actuator rod for
specimen installation, and one for full fluid flow resulting in normal, high
speed testing operation.

The handset has an encoder and buttons to help you during specimen
installation and test execution. The handset also has an alphanumeric
display and LEDs to provide feedback.

Specimen Installation

The procedure to install a specimen varies due to the variety of test fixtures, grips, and the type of specimen
being installed. This section should be considered a guideline. You need to modify this procedure to suit your
equipment.

Prerequisites

You must have the necessary grips and/or fixturing installed.

Note:

When changing hydraulic grips, make sure you cap or plug the hydraulic hoses when removed to
prevent oil spillage. Oil spillage can create an environmental concern and slippery surface that can
cause personal injury. Promptly clean up any oil that might have spilled when hoses were removed.

You must also have the controller set up to control the actuator movement, and you must have a test program
defined.

Warning:

The crosshead is very heavy.

A dropping crosshead can crush hands, damage grips, and smash specimens.

Be careful when working in a crush zone. To reduce the hazards in this procedure, observe the
following:

Set and enable displacement interlocks to limit the actuator’s movement.

Ensure that the crosshead is locked.

Ensure that the columns are clean and dry.

Keep your hands out of the crush zone except when performing the steps needed to complete
this procedure.

MTS Landmark™ Tabletop Load Units Product Information 57

Operation

Install the Specimen

1. Prepare the components for specimen installation.

a) Ensure that the crosshead is locked.

b) Turn on system electrical power.

c) Apply HPU system high hydraulic pressure. Apply load unit station low hydraulic pressure.

d) If the system has a Series 494 based controller, enable the Gate Interlock.

e) Set the actuator velocity limiting switch to the tortoise (restricted flow).

f) Enable the handset and use the thumb wheel to move the actuator to its start position (usually

mid-displacement). The starting position of the actuator depends on the type of fixtures, grips, and the
test being set up.

Caution:

For load units with hydraulic lifts and locks, the crosshead can slowly drift down the columns
if the locks are turned off and when hydraulic pressure is turned off.

The crosshead can damage any test fixtures, grips, and specimen in its path.

Unlock the crosshead only to reposition it. Always lock the crosshead after you have
repositioned it, and never leave the crosshead unlocked.

2. Set the crosshead position.

The crosshead position depends on the length of the specimen being tested, the starting position of the
actuator, and the size of the fixtures or grips being used.

3. Install the specimen.

Specimen installation varies according to the type of grip being used. For installation instructions, see the
appropriate grip manual. MTS manufactures a variety of grips:

• The Series 641 Hydraulic Wedge Grips (hydraulically controlled) are specifically designed for static or

fatigue testing applications. They are available with a self-aligning feature.

• The Series 643.6X Tension/Compression Grips (mechanical) are used for testing threaded-end and

button-end specimens in tension, compression, or tension/compression.

• The Series 646 Hydraulic Collet Grips (hydraulically controlled) are designed to perform in a wide

variety of testing applications (for example, high and low cycle fatigue, tension, and compression).

• The Series 647 Hydraulic Wedge Grips (hydraulically controlled) are specifically designed for static or

fatigue testing applications. There are a variety of configurations of this grip.

• The Advantage Grips (mechanical) are specifically designed for static or fatigue testing applications.

The Advantage Mechanical Wedge grip is the mechanical version of the Series 647 Hydraulic Wedge
Grips. Advantage Grips also come in Screw Action and Pneumatic versions.

58 MTS Landmark™ Tabletop Load Units Product Information

Operation

• Bionix grips and other specialty grips (mechanical) are designed to grip specific types of material such

as string, tread, tendons, and so forth.

Each type of grip requires the specimen or specimen fixture to fit properly into the grip. You should always
review specimen installation procedures found in any grip Product Information manual.

Caution:

Incorrectly installed specimens can be a hazard during testing.

An insufficiently gripped specimen can cause specimen damage, equipment damage, and
the possibility of specimen fragmentation.

Before testing, ensure both grips are clamped and the specimen is secure.

4. Set up the load frame for testing.

a) Set the actuator velocity limiting switch to the hare (full flow).

b) Disable the handset and set up the controller for system operation.

5. Reset the controller Gate Interlock.

6. Apply load unit station high hydraulic pressure.

Position the Crosshead Manually

This procedure describes how to position a crosshead for a load unit with no hydraulic crosshead lifts or locks.

Warning:

The crosshead is very heavy.

A dropping crosshead can crush hands, damage grips, and smash specimens.

Observe the following precautions to reduce the possibility of unexpected crosshead movement:

Ensure that the crosshead is locked.

The overhead crane and lifting chains must be able to support the weight of the crosshead.

Center the crane directly over the load unit. Remove any slack in the lifting chains before unlocking
the crosshead.

Remove any slack in the lifting chains before unlocking the crosshead.

Completely loosen all crosshead locking bolts before attempting to move the crosshead.

Keep the columns clean and dry. The crosshead cannot be securely clamped to greasy or damp
columns.

MTS Landmark™ Tabletop Load Units Product Information 59

Operation

The following procedure describes using an overhead crane to position the crosshead. You can use any
device that can lift the weight of the load unit.

Crosshead Weights

Model 370.50Model 370.25Model 370.10Model 370.02

193 kg (425 lb)102 kg (225 lb)57 kg (125 lb)84–114kg (186–252 lb)

1. Center the overhead crane directly over the load unit.

2. Wrap lifting slings around the crosshead. Remove any slack in the lifting chains or slings while keeping
tension to a minimum.

3. Attach the lifting chains to the lifting rings, or wrap lifting slings around the crosshead. Remove any slack
in the lifting chains or slings while keeping tension to a minimum.

4. Remove the covers on the ends of the crosshead. The crosshead covers must be removed to access the
manual locking bolts and to clean and lubricate the bolts. Six 1/4-20 screws (three top, three bottom) on
each cover need 5/32 hex (not included). Hand-tighten when reinstalling the covers.

5. Loosen the crosshead locking bolts in 1/4 turn steps (counterclockwise). The following figure shows the
sequence of loosening the crosshead bolts.

Crosshead Locking Bolt Torque

DescriptionItem

190 N·m (140 lbf·ft)1

60 MTS Landmark™ Tabletop Load Units Product Information

Crosshead Locking Bolt Torque

Operation

DescriptionItem

190 N·m (140 lbf·ft)1

271 N·m (200 lbf·ft)2

6. Raise or lower the crosshead using the overhead crane.

7. Manually clamp the crosshead to lock the crosshead into position.

MTS Landmark™ Tabletop Load Units Product Information 61

Operation

Manually Clamp the Crosshead

Warning:

The crosshead is very heavy.

A dropping crosshead can crush hands, damage grips, and smash specimens.

Observe the following precautions to reduce the possibility of unexpected crosshead movement:

Ensure that the crosshead is locked.

The overhead crane and lifting chains must be able to support the weight of the crosshead.

Center the crane directly over the load unit. Remove any slack in the lifting chains before unlocking
the crosshead.

Remove any slack in the lifting chains before unlocking the crosshead.

Completely loosen all crosshead locking bolts before attempting to move the crosshead.

Keep the columns clean and dry. The crosshead cannot be securely clamped to greasy or damp
columns.

Caution:

The crosshead can slowly drift down the columns if the locks are turned off and when hydraulic
pressure is turned off.

The crosshead can damage any test fixtures, grips, and specimen in its path.

Unlock the crosshead only to reposition it. Always lock the crosshead after you have repositioned
it and never leave the crosshead unlocked.

The manual clamping procedure is a four step process. The four steps allow the crosshead to be clamped
evenly.

Before clamping the crosshead in place, you must have determined the proper crosshead position and moved
the crosshead to that position.

Tighten the crosshead clamping bolts according to the torque settings shown in the Crosshead Clamping
Bolts Torque Values table found in the next section.

1. Torque the crosshead bolts to the value in Step 1.

2. Torque the crosshead bolts to the value in Step 2.

3. Torque the crosshead bolts to the value in Step 3.

4. Torque the crosshead bolts to the value in Step 4.

62 MTS Landmark™ Tabletop Load Units Product Information

Note:

Use the same sequence when you loosen the bolts.

Crosshead Clamping Bolt Torque Values

The following table includes values for crosshead clamping bolt torques for each step in the manual clamping
procedure.

Torque Values

Step 3Step 2Step 1Load Unit

Step 4

190 N·m (140 lbf·ft)190 N·m (140 lbf·ft)171 N·m (126 lbf·ft)20 N·m (15 lbf·ft)370.02

190 N·m (140 lbf·ft)190 N·m (140 lbf·ft)171 N·m (126 lbf·ft)20 N·m (15 lbf·ft)370.10

271 N·m (200 lbf·ft)271 N·m (200 lbf·ft)244 N·m (180 lbf·ft)20 N·m (15 lbf·ft)370.25

Operation

1

Move the Crosshead Hydraulically

This procedure describes how to position a crosshead for a Series 370 Load Unit equipped with hydraulic
crosshead lifts.

1. Pressurize the lift actuators. The crosshead may have shifted position while hydraulic pressure was turned
off.

Briefly turn the Crosshead Lift Control to the lift crosshead position to apply a slight upward pressure to
the crosshead.

Then return the lift control to the stop position "O."

2. Unclamp the crosshead. Loosen the four bolts that clamp the crosshead to the columns.

3. Use the Crosshead Lift Control to move the crosshead to a point where you can install the specimen
(or specimen fixture) into the upper grip or fixture without obstruction.

Set the control to the stop position "O" before proceeding.

1

This step ensures uniform tightness.

MTS Landmark™ Tabletop Load Units Product Information 63

Operation

Note:

Always lower the crosshead to where you want it. The pressure remaining in the lift cylinders after
raising the crosshead can slightly shift its alignment. Lowering the crosshead to its final position
removes this pressure and improves alignment.

4. Tighten the crosshead clamping bolts to secure the crosshead in place.

Torque the clamping bolts according to the torque settings shown for Step 1 in the following table. Use
the bolt sequence shown above. Then torque the crosshead bolts to the values in Step 2 and so on until
Step 4 is complete.

Step 4Step 3Step 2Step 1

190 N·m (140 lbf·ft)190 N·m (140 lbf·ft)171 N·m (126 lbf·ft)20 N·m (15 lbf·ft)

5. Position the clamp ring.

Slide the clamp ring on the column just under the crosshead position and tighten it.

Adjust the Grip Clamp Rate

The clamp rate determines how fast the grip can clamp a specimen. Experiment with a dummy specimen to
find the best setting.

1. Ensure that both the upper grip control and lower grip control are in the unclamp position.

2. Turn on electrical power at the test controller.

3. Turn on low or high hydraulic pressure.

4. If needed, move the crosshead or actuator so that the dummy specimen can be easily installed in the
lower grip.

Warning:

The crosshead is very heavy.

A dropping crosshead can crush hands, damage grips, and smash specimens.

Be careful when working in a crush zone. To reduce the hazards in this procedure, observe
the following:

Set and enable displacement interlocks to limit the actuator’s movement.

Ensure that the crosshead is locked.

Ensure that the columns are clean and dry.

Keep your hands out of the crush zone except when performing the steps needed to complete
this procedure.

64 MTS Landmark™ Tabletop Load Units Product Information

5. Turn the Rate control fully clockwise for the slowest clamp speed.

6. Fully install the dummy specimen in the lower grip.

7. Cycle the lower grip control between the clamp and unclamp positions to clamp and unclamp the specimen.

a) Watch the speed at which the lower grip clamps and unclamps the specimen.

b) Adjust the Rate control counterclockwise for the desired speed.

Adjust the Grip Clamp Force

The pressure control adjusts the hydraulic pressure applied to the grips. The rate control adjusts the grips’
clamping speed. They must be adjusted before the grips can be used.

The amount of hydraulic pressure applied depends on the type of grips you are using and what you are
gripping. Use your grip manual to determine the correct hydraulic pressure before adjusting the force.
Experiment with a dummy specimen to find the best setting.

Operation

Note:

The pressure control can adjust the grip pressure up to the maximum output pressure setting (which
is initially set by MTS Systems Corporation).

1. Ensure that both the upper grip control and lower grip control are in the unclamp position.

2. Turn on the electrical power at the test controller.

3. Turn on low or high hydraulic pressure.

4. If needed, move the crosshead or actuator so that the dummy specimen can be easily installed in the
lower grip.

Caution:

Grips are designed to operate within a range of hydraulic pressure.

Too much pressure can damage both the grips and the specimen.

Do not adjust grip pressure higher than the grip rating. To determine the correct hydraulic
pressure to apply to your grips before adjusting the Pressure control, see your grip manual.

5. Adjust the pressure control for the desired hydraulic pressure.

6. If you exceed the desired pressure setting, adjust the Pressure control counterclockwise 1/2 turn. If the
pressure setting exceeds 21 MPa (3000 psi), cycle (clamp and unclamp) one of the grips. Return to Step

5.

MTS Landmark™ Tabletop Load Units Product Information 65

Operation

Handset Control

The handset has an encoder and buttons to help you during specimen installation and test execution. The
handset also has an alphanumeric display and LEDs to provide feedback.

Note:

While the actuator is in handset control, actuator speed is limited to <10 mm/sec.

Handset Control Functions

The handset is intended to be used for specimen loading or setup. In some applications, it can be used to
completely run a test.

66 MTS Landmark™ Tabletop Load Units Product Information

Handset Controls and Indicators

DescriptionControl/IndicatorItem

Displays previous or next text in the display.Page1

Indicator. When lit, indicates the system is active (power applied).Active2

Operation

Scroll Highlight3

Thumb-Wheel4

Pause5

Stop6

Start9

Interlock Reset10

Thumbwheel Enable11

Scrolls the highlighted selection down. Selection cycles to the top
when the bottom line is highlighted and the switch is pressed.

Makes fine actuator adjustment (towards display – up; away from
display – down). Only if Handset Enable is active.

Pauses the test action. This must be pressed again for the test
to resume. Only if the application test software is active.

Stops the test action. Only if the application test software is active.

RJ-45, to Controller.Connector7

Shuts down the HPU.Hydraulic Off8

Starts the test action. Only if the application test software is active.

Resets active interlock(s) providing the cause for the interlock(s)
has been remedied.

Press to enable the thumbwheel to position the actuator. Press
again to disable the thumbwheel. The indicator lights when the
thumbwheel is active.

Indicator. When lit, indicates an active fault or interlock.Fault12

Used to enable/disable the handset. When the indicator is lit, the
handset is enabled for control of the actuator.

Selects the highlighted line in the display.Select (Enter)14

Four lines, 20 characters per line.

15

Handset Enable13

Display

Standard Test Area Enclosure Operation

There are four operating modes for an MTS Landmark Test System:

• Hydraulic Power Off

• Specimen Installation and Setup

• Run Mode

• Service

MTS Landmark™ Tabletop Load Units Product Information 67

Operation

Hydraulic Power Off

Hydraulic Power is prevented from energizing the circuit via the hydraulic service manifold. Full access to the
test area is allowed in this mode.

Specimen Installation and Setup

The controller provides a means for creating a specimen installation mode. This mode typically uses the
Channel Limited Channel (CLC) control method. The primary control channel is Displacement (stroke) with
maximum limits set on applied force. Tuning parameters unique to this mode optimize manual control during
this mode. In addition, a maximum velocity command is set.

The handset has the ability to have a configuration specific desired response to the thumbwheel encoder on
the handset for a precise level of control.

In conjunction with the controller and specimen installation mode using the handset, the load frame itself has
two operation modes: full flow, and actuator velocity limiting restricted flow. A switch on the load frame control
panel activates a solenoid which controls a hydraulic circuit within the load frame hydraulic service manifold.
In the actuator velocity limiting mode, oil flow to the actuator is directed through an orifice which limits actuator
velocity to 10 mm/second or less. This switch circuit is integrated with the test area enclosure door switches.

The enclosure has doors on the front and rear of the test area which are locked and confirmed secure with
a keyed latch mechanism. Power must be applied to the door switches to allow entry into the test area. Power
is applied to the door switches when the system is in the actuator velocity limiting mode. When either of the
doors is open, the system will not permit the operator to return the load frame into full flow mode or put the
controller in program run mode. If the solenoid door latch is defeated and the door is opened during normal
operation, the system will detect this and activate the limited actuator velocity mode and put the controller
into program interlock mode.

Specimen Installation and Setup–Interrupt Operation

To interrupt operation:

1. Switch the system to the CLC manual control mode.

2. Activate the handset control.

3. Prior to gaining access to the test area, switch to velocity limiting mode on the load frame control panel.

Specimen setup or removal can now take place inside the test area enclosure.

Specimen Installation and Setup–Resume Operation

To resume normal test mode:

1. Close the door.

2. Switch to full flow mode.

3. Deselect the handset control.

4. Put the system into the control mode desired for the start of the test.

68 MTS Landmark™ Tabletop Load Units Product Information

Run Mode

The system is fully operational when all of the following have been satisfied.

• The test area enclosure doors are closed.

• The actuator velocity limiting is in full-flow state.

• The handset and manual control are yielded to controller.

• The system is in high pressure.

Service

Most normal service requirements can be met utilizing the normal three operating modes as listed previously.
However, there can be circumstances where operation in full flow mode with the test area enclosure open is
required. In these cases, trained service personnel can disconnect the standard enclosure cable, and
temporarily replace it with a service connector. This operation is not considered typical use, and should only
be used by trained individuals.

Operation

Emergency Stop and Actuator Velocity Limiting Switch

The emergency stop switch and actuator velocity limiting switch function the same as those on the control
panel.

Enclosure Controls

DescriptionItem

Emergency Stop Switch1

Actuator Velocity Limiting Switch2

MTS Landmark™ Tabletop Load Units Product Information 69

Operation

Interlock logic

The interlock logic is as follows:

Interlock Logic

DescriptionItem

Door Interlock1

Solenoid Contacts2

Test Controller Program Interlock Input. Open = Interlock.3

To Low Flow Power Supply4

To Controller Program Interlock Chain5

Test Area Enclosure with Light Curtain

This section provides information on the test area enclosure with light curtain provided with some configurations
of the Series 370 Tabletop Load Unit.

The light curtain replaces the door typically included with a test area enclosure. This configuration of the test
area enclosure is typically used in QC elastomer applications. It includes operator control panels that require
both hands outside the test area to start the test. If the actuator is moving and the light curtain beam is
interrupted, the actuator motion stops until the beam is no longer interrupted.

70 MTS Landmark™ Tabletop Load Units Product Information

Operation

Enclosure with Light Curtain

DescriptionItem

Test Area Guard1

Control Panel2

Light Curtain Elements3

To operate the enclosure with a light curtain:

1. Place the part to be tested on the lower platen.

2. Push both Start buttons simultaneously.

The test proceeds until complete and the actuator rod returns to the end-of-test position.

3. Perform an applicable pass or fail procedure. This is defined by the customer based on testing and part
handling requirements.

4. Remove the tested part.

5. Repeat Steps 1 through 5.

MTS Landmark™ Tabletop Load Units Product Information 71

Operation

Note:

The following wiring diagram is provided for theory of operation and troubleshooting purposes.

72 MTS Landmark™ Tabletop Load Units Product Information

Maintenance

Topics:

•

Routine Maintenance Overview Checklist.............................................................................................74

•

Other Maintenance Tasks......................................................................................................................77

•

Daily Inspections....................................................................................................................................78

•

Clean the Columns................................................................................................................................79

•

Prevent Rust..........................................................................................................................................80

•

Maintain Airmount Pressures.................................................................................................................82

•

Label Inspection.....................................................................................................................................84

•

Adjust the Hydraulic Locks....................................................................................................................84

•

Lubricate the Crosshead Locking Bolts.................................................................................................88

•

Aligning the Force Transducer...............................................................................................................89

•

Series 111 Accumulator: Maintenance Overview...................................................................................93

•

Series 111 Accumulator: Check and Change Precharge Pressure.......................................................95

•

Actuator..................................................................................................................................................99

•

Change the HSM Filter........................................................................................................................100

•

252 Servovalve....................................................................................................................................102

•

Performing Sensor Calibration.............................................................................................................108

MTS Landmark™ Tabletop Load Units Product Information 73

Maintenance

Routine Maintenance Overview Checklist

Recommended service to be performed at each running time interval noted

Time Rate Per Day

2

Ensure the actuator platen area is clean.

attached properly.

supports are in working order.

X

XCheck all filter indicators.

XEnsure all hose, cables, and connectors are

XEnsure that the crosshead, lifts, and

AnnuallyBiweeklyWeeklyDailyCalendar Time using 8 hour Running

2,0001,500100050080408Running Time-Hours

is in working order.

frame at 75-100 hrs)

attached and legible.

Crosshead/Load Frame

Ensure that the crosshead, lifts, and
supports are in working order.

XEnsure that the actuator is dry.

XEnsure that the hydraulic service manifold

XEnsure that the lift seal connection is dry.

XEnsure that the lock seal condition is dry.

XLubricate the axial/torsional spline. (Bionix

XEnsure that the actuator is in working order.

XInspect all labels to ensure they are

3

MTSMTSMTSMTSMTS

MTSMTSMTSMTSMTSEnsure that the lift seal condition is dry.

MTSMTSMTSMTSMTSEnsure that the lock seal condition is dry.

2

Symbol denotes services performed by equipment operators. Most of these procedures involve visual checks
that should not interfere with test system operation. These checks are also completed by trained field service
engineers on each Routine Maintenance visit.

3

Symbol denotes service performed by trained field service engineers as part of an MTS Routine Maintenance
plan. Some of these procedures require special service tools and/or specific service training to complete.

74 MTS Landmark™ Tabletop Load Units Product Information

Time Rate Per Day

clean.

abrasions.

appropriate.

a program interlock.

airbags and pads.

smooth.

Maintenance

AnnuallyBiweeklyWeeklyDailyCalendar Time using 8 hour Running

2,0001,500100050080408Running Time-Hours

MTSMTSMTSMTSMTSEnsure that the crosshead columns are

MTSMTSMTSMTSMTSEnsure that there are no extreme column

MTSMTSMTSMTSMTSEnsure that the crosshead speed is

MTSMTSMTSMTSMTSTest to ensure the crosshead unlock causes

MTSMTSMTSMTSMTSCheck the condition of all load frame support

MTSMTSMTSMTSMTSEnsure that the crosshead movement is

are functioning properly.

Actuator

clean.

acceptable level.

frame at 75-100 hrs)

up direction.

MTSMTSEnsure that the hydraulic crosshead locks

MTSMTSBleed the crosshead lift cylinders.

MTSLubricate the manual crosshead lock bolts.

4

MTSReplace the hydraulic lock cap screws.

MTSMTSMTSMTSComplete a cursory check of the actuator.

MTSMTSMTSMTSEnsure that the actuator area is dry.

MTSMTSMTSMTSEnsure that the actuator platen area is

MTSMTSMTSMTSEnsure that the piston rod wear is at an

MTSMTSMTSMTSLubricate the axial/torsional spline. (Bionix

MTSMTSMTSMTSVerify the performance at low velocity in the

MTSMTSMTSMTSVerify the performance at low velocity in the

down direction.

4

Replacement of the hydraulic crosshead lock cap screws is recommended every 5 years or 5500 duty cycles,
whichever comes first.

MTS Landmark™ Tabletop Load Units Product Information 75

Maintenance

Time Rate Per Day

Hydraulic Service Manifold

service manifold.

are tight.

are dry.

are tight.

AnnuallyBiweeklyWeeklyDailyCalendar Time using 8 hour Running

2,0001,500100050080408Running Time-Hours

MTSMTSMTSMTSComplete a cursory check of the hydraulic

MTSMTSMTSMTSMonitor the filter indicators.

MTSMTSMTSMTSEnsure that the manifold hose connections

MTSMTSMTSMTSEnsure that the accumulator connections

MTSMTSMTSMTSEnsure that the accumulator connections

guards are present.

piston.

accumulator.

294).

Hoses/Cables

cables, and connectors.

abrasions, blisters, or vulcanizing.

condition and routed correctly.

MTSMTSMTSMTSEnsure that all of the accumulator caps and

MTSMTSMTSMTSOil the accumulator on the gas side of the

MTSMTSMTSMTSCheck and adjust the pressure in the

MTSChange the filters.

MTSPerform the low pressure adjustment (Model

MTSMTSMTSMTSComplete a cursory check of the hoses,

MTSMTSMTSMTSEnsure that the hoses show no signs of

MTSMTSMTSMTSEnsure that the cables are in acceptable

crimps are dry.

Complete System

system is acceptable for use.

76 MTS Landmark™ Tabletop Load Units Product Information

MTSMTSMTSMTSCheck the transducer connections.

MTSMTSMTSMTSEnsure that the hose connections and

MTSMTSMTSMTSEnsure that the overall condition of the

Time Rate Per Day

appropriate and the system is stable.

condition. (If applicable.)

full stroke waveform.

balance.

turns on when the load unit is running on
high.

Maintenance

AnnuallyBiweeklyWeeklyDailyCalendar Time using 8 hour Running

2,0001,500100050080408Running Time-Hours

MTSMTSMTSMTSEnsure that the turning parameters are

MTSMTSMTSMTSEnsure that the E-Stop is in working

MTSMTSMTSMTSCheck the visual and audible response to a

MTSMTSMTSMTSCheck the displacement control and valve

MTSMTSMTSMTSCheck the valve dither response.

MTSMTSMTSMTSVerify that the High/Low Velocity Switch light

interlock.

Grips

the grip controls.

dry.

Other Maintenance Tasks

The following table lists the recommended interval for each of these procedures.

MTSMTSMTSMTSVerify that low velocity causes a program

MTSMTSMTSMTSComplete a cursory check of the grips and

MTSMTSMTSMTSEnsure that the grip supply connections are

MTSMTSMTSMTSEnsure that the grip seals are dry.

MTSMTSMTSMTSEnsure that the grip action is acceptable.

MTSMTSMTSMTSLubricate the grip inserts.

Load Unit Maintenance Intervals

When to Do ItWhat to Do

Before the start of each day’s testing.Make daily inspections.

MTS Landmark™ Tabletop Load Units Product Information 77

Maintenance

When to Do ItWhat to Do

When the columns become greasy or dirty.Clean the load unit columns.

Prevent rust.

Adjust the hydraulic locks.

Lubricate the crosshead locking bolts.

Align the force transducer.

Check the accumulators’ precharge pressures. Adjust
if necessary.

Change the HSM filter.

Depends on the operating environment; more often in
humid environments.

When the load unit sits unevenly.Maintain airmount pressures.

When the crosshead sticks or moves jerkily on the
column.

Whenever they begin to be hard to tighten or sticky
when loosened.

When the bolts begin to loosen or tighten stiffly (manual
locking crossheads only).

After actuator or force transducer installation; when a
better alignment between the two is desired.

At least once a month; more often as required by
operating conditions.

Weekly; more often as required by operating conditions.Clean exposed actuator piston rod.

When the indicator is in bypass position or when
hydraulic fluid is changed.

When servovalve performance has deteriorated.Change the filter in the servovalve.

Adjust mechanical null in the servovalve.

Perform sensor calibration.

After the valve balancing procedure (electrical
compensation) has been completed and the results
are judged unsatisfactory.

Calibration intervals depend on system requirements
and are typically performed during scheduled
maintenance by MTS trained personnel. Sensors can
include LVDT, load cell, and extensometer.

Daily Inspections

Before the start of each day’s testing, do a quick inspection of the load unit. Following are typical things that
should be checked daily:

• Ensure that there are no leaks from lifts or locks.

• Check the drip pan and ensure that there are no leaks from the actuator, hydraulic service manifold,
servovalve, or accumulators.

• Ensure that electrical connections are tight, with no frayed or poorly routed cables.

• Ensure that hoses are routed properly, not wearing, and the fittings are not leaking.

78 MTS Landmark™ Tabletop Load Units Product Information

• Hoses must be routed as to avoid direct heat sources, moving, or abrasive equipment.

• Check actuator speed control functionality.

If any problems are encountered, they should be repaired before operating the load unit.

Clean the Columns

The crosshead locks cannot securely clamp the crosshead to dirty or greasy columns. You will need ethanol
and lint-free cloths to perform this procedure.

Warning:

The crosshead can slide down the columns.

Crosshead cleaning takes place in a crush zone where pinched fingers and crushed hands can
occur.

Do not position yourself in a crush zone. Always lock the crosshead after moving it. Always turn
off hydraulic pressure before cleaning the columns. Wait two minutes for pressure to bleed off
before starting work.

Maintenance

1. Ensure that the crosshead is locked.

2. Using a clean, lint-free cloth, clean the exposed surfaces of the columns with ethanol.

3. If the load unit does not have hydraulic crosshead lifts, skip ahead to the next step. If the load unit has
hydraulic crosshead lifts, complete the following steps:

a) Turn on system electrical power.

b) Apply high hydraulic pressure to the load unit.

4. If there is a specimen in the load unit, remove it.

5. Unlock and move the crosshead to expose the uncleaned section of the columns.

6. Lock the crosshead.

7. If hydraulic pressure has been turned on, turn it off. Wait two minutes for the pressure to bleed off before
going on to the next step.

8. Clean the remaining sections of the columns.

MTS Landmark™ Tabletop Load Units Product Information 79

Maintenance

Prevent Rust

Where you operate the load unit determines how often you take rust prevention measures. Humid and corrosive
environments require more prevention.

Recommended Supplies

• Ethanol

• Silicone spray

• 000 emery cloth

• Touch-up paint

• Metal primer paint

• Lint-free cloths

Warning:

The crosshead locks cannot securely clamp on damp columns. The crosshead can slip if the
columns are still damp with kerosene.

You can be hurt and your equipment damaged.

Wait until the columns are dry to the touch before moving and locking the crosshead.

80 MTS Landmark™ Tabletop Load Units Product Information

Maintenance

MTS Landmark™ Tabletop Load Units Product Information 81

Maintenance

Rust Prevention Recommendations

DescriptionItem

1

2

3

4

Unpainted surfaces: Spray with silicone, and then wipe with a clean, lint-free cloth.
Or, wipe with a clean, lint-free cloth dampened with clean hydraulic fluid.

Chrome plated surfaces: For microscratches, wipe with a clean, lint-free cloth dampened
with ethanol. For rust discoloration, polish with a very fine emery cloth, and then wipe
down.

Painted surfaces: For small scratches, use touch-up paint. For large scratches, sand,
prime, and use touch-up paint.

Black oxide surfaces: Spray with silicone, and then wipe with a clean, lint-free cloth.
Or, wipe with a clean, lint-free cloth dampened with clean hydraulic fluid.

Maintain Airmount Pressures

Optional inflatable airmounts reduce vibration and noise. They are installed under the feet of the load unit.
Inflation pressures must be maintained to both level and isolate the load unit.

Warning:

Airmounts can be overinflated and then explode.

You can be seriously hurt if an airmount explodes, sending fragments flying.

Only inflate airmounts that have the full weight of the load unit resting on them. Never inflate an
airmount above 0.41 MPa (60 psi). Check airmount pressures with an accurate pressure gage.

Each airmount's inflated height—measured from the floor to the bottom of the load unit’s
leg—should be 57–63 mm (2.25–2.5 in).

Warning:

Airmounts can be overinflated and then explode.

You can be seriously hurt if an airmount explodes, sending fragments flying.

Only inflate airmounts that have the full weight of the load unit resting on them. Never inflate an
airmount above 0.55 MPa (80 psi). Check airmount pressures with an accurate pressure gage.

Each airmount's inflated height—measured from the floor to the bottom of the load unit’s
leg—should be 83–89 mm (3.25–3.5 in).

1. Check the inflation pressures on each airmount. Bleed any airmount whose pressure is above 0.41 MPa
(60 psi).

82 MTS Landmark™ Tabletop Load Units Product Information

Maintenance

2. Check the inflation pressures on each airmount. Bleed any airmount whose pressure is above 0.55 MPa
(80 psi).

3. Check the airmounts’ inflated heights. They should be between 57–63 mm (2.25–2.5 in).

If the load unit is level and the airmount heights correct, you are done.

If not, continue this procedure.

Checking Airmount Inflated Heights

DescriptionItem

5 mm (0.20 in)1

0.41 MPa (60 psi)2

57–63 mm (2.25–2.5 in)3

4. Check the airmounts’ inflated heights. They should be between 83–86 mm (3.25–3.5 in).

If the load unit is level and the airmount heights correct, you are done.

If not, continue this procedure.

MTS Landmark™ Tabletop Load Units Product Information 83

Maintenance

Checking Airmount Inflated Heights

DescriptionItem

5 mm (0.20 in)1

0.55 MPa (80 psi)2

83–89 mm (3.25–3.5 in)3

5. Gradually inflate or deflate each airmount in 5 mm (0.20 in) steps as required to level the load unit.

Ensure that airmount pressures do not rise above 0.41 MPa (60 psi) and heights do not rise above 63 mm
(3.5 in).

Ensure that airmount pressures do not rise above 0.55 MPa (80 psi) and heights do not rise above 89 mm
(3.5 in).

6. After leveling the load unit, check that the height of each airmount is between 57–63 mm (2.25–2.5 in).

7. After leveling the load unit, check that the height of each airmount is between 83–86 mm (3.25–3.5 in).

8. If any airmount pressures are above 0.41 MPa (60 psi) or any airmount heights not between 57–63 mm
(2.25–2.5 in), repeat Steps 1–3 until the load unit is level.

9. If any airmount pressures are above 0.55 MPa (80 psi) or any airmount heights not between 83–86 mm
(3.25–3.5 in), repeat Steps 1–3 until the load unit is level.

Label Inspection

At least once a month, inspect labels to ensure they are firmly attached and legible. Replace tables as required.
For a description of hazard and information labels, see the Safety section.

Adjust the Hydraulic Locks

Hydraulic locks might need adjustment if the crosshead still moves jerkily after bleeding the lift cylinders.
Adjustment might also be needed if the crosshead slips under full load.

If adjusting the hydraulic locks does not fix these problems, call MTS.

84 MTS Landmark™ Tabletop Load Units Product Information

Maintenance

Warning:

Over time, repeated cycling and stress pressures on the cap screws can cause cap screw failure.

The cap screw can become a projectile, resulting in equipment damage and personal injury.

After 5 years or 5500 duty cycles, contact MTS for replacement of the hydraulic crosshead lock
cap screws.

1. Turn on electrical power at the controller. Do not turn on hydraulic pressure yet.

2. If the crosshead is already at a comfortable working level with no specimen installed, proceed to Step 3.

If not, position the crosshead to a comfortable working level.

a) Reset any active interlocks at the test controller.

b) Turn on high hydraulic pressure.

c) If there is a specimen in the load unit, remove it.

d) Move the crosshead to a comfortable working height.

Caution:

The crosshead can slowly drift down the columns if the locks are turned off and when hydraulic
pressure is turned off.

The crosshead can damage any test fixtures, grips, and specimen in its path.

Unlock the crosshead only to reposition it. Always lock the crosshead after you have
repositioned it and never leave the crosshead unlocked.

3. Use the Lock Control to lock the crosshead. Then torque the manual crosshead locking bolts in the order
shown in the following illustration.

Crosshead Fastener Torque Values

DescriptionItem

136 N·m (100 lbf·ft)1

MTS Landmark™ Tabletop Load Units Product Information 85

Maintenance

Crosshead Fastener Torque Values

DescriptionItem

136 N·m (100 lbf·ft)1

271 N·m (200 lbf·ft)2

271 N·m (200 lbf·ft)3

4. Turn off hydraulic pressure.

5. Use the Lock Control to unlock the crosshead position to remove pressure from the hydraulic locks. Wait
two minutes for the pressure in the locks to drop to zero before going on to the next step.

6. Tighten each lock’s cap screw until its piston bottoms out. Then loosen and hand-tighten each cap screw.

86 MTS Landmark™ Tabletop Load Units Product Information

Maintenance

Adjusting the Hydraulic Locks

DescriptionItem

Tighten1

Bottom Out Position2

Loosen, then hand tighten.3

7. Loosen each of the hydraulic lock cap screws 1/4 turn.

Loosening the Hydraulic Lock Cap Screws

DescriptionItem

Loosen 1/4 turn.1

8. Turn on electrical power at the test controller if you have not already done so.

9. Reset any active interlocks at the test controller.

10. Turn on high hydraulic pressure.

11. Return the Lock Control to the lock crosshead position to pressurize the hydraulic locks.

MTS Landmark™ Tabletop Load Units Product Information 87

Maintenance

12. Fully loosen the manual crosshead locking bolts. Then turn the Lock Control to the unlock crosshead
position.

13. Move the crosshead, locking and unlocking it, to check for smooth operation.

Lubricate the Crosshead Locking Bolts

Lubricate the locking bolts in a manually locked crosshead whenever they begin to be hard to tighten or sticky
when loosened.

1. Position the crosshead to a comfortable working height.

2. Lock the crosshead following the normal crosshead locking procedure.

3. Remove a single locking bolt.

Lubricating the Crosshead Locking Bolts

DescriptionItem

Unscrew one at a time.1

Clean and lubricate.2

4. Clean the bolt threads with a stiff nylon brush. Use degreaser if necessary. Dry the threads.

5. Lightly lubricate the threads with Molykote G-n paste.

6. Reinstall the locking bolt, tightening it to a value specified in the following table.

TorqueLoad Unit

190 N·m (140 lbf·ft)370.02

88 MTS Landmark™ Tabletop Load Units Product Information

TorqueLoad Unit

190 N·m (140 lbf·ft)370.10

271 N·m (200 lbf·ft)370.25

271 N·m (200 lbf·ft)370.50

7. Repeat Steps 4 and 5 until all the bolts have been lubricated.

Aligning the Force Transducer

A force transducer must be aligned with the actuator piston whenever the force transducer is installed or the
actuator serviced. The force transducer can also be aligned whenever you want to increase test accuracy.

Alignment has two major tasks:

Maintenance

• Find the Current Total Indicated Runout (TIR)

• Get the TIR within Specifications

TIR measures alignment accuracy and it is the difference between maximum and minimum dial indicator
readouts. The smaller the TIR, the better.

Required Equipment

You will need the following equipment to align a force transducer:

• 135 N·m (100 lbf·ft) torque wrench

• Nylon mallet

• 0.0025 mm (0.0001 in.) dial indicator with a magnetic base

Align the Force Transducer

Warning:

Alignment takes place in a crush zone.

The crosshead could drop suddenly, crushing hands and damaging load unit components.

Be sure you lock the crosshead, turn off electrical power, and use the clamp ring as described
in the following procedure.

1. Get things ready:

a) Be sure that the crosshead is locked.

MTS Landmark™ Tabletop Load Units Product Information 89

Maintenance

b) If grips are installed, remove them.

c) Turn on system electrical power.

d) If necessary, reset any active interlocks at the test controller.

e) Loosen the clamp ring (located on one of the columns) and slide it down the column.

f) Turn on low hydraulic pressure; turn on high hydraulic pressure if low pressure is not available.

g) Position the actuator at midstroke.

Caution:

Do not leave a crosshead unlocked.

It can drift slowly down when hydraulic pressure is turned off and damage any test fixtures,
grips, and specimen in its path.

Unlock the crosshead only to reposition it. Always lock the crosshead after you have
repositioned it.

2. Set the crosshead position.

Move the crosshead or actuator so that there is about 360 mm (14 in) between the bottom of the actuator
and the top of the force transducer. You need enough room to use a dial indicator.

• If you have hydraulic lifts, see the “Move the Crosshead Hydraulically” section to position the crosshead.

• If you have manual lifts, see the “Position the Crosshead Manually” section to position the crosshead.

Set and enable the test controller’s upper and lower limit detect interlocks to limit the actuator’s movement
to 2 mm (0.1 in) in each direction.

3. Check the alignment.

In this step, check the alignment between the force transducer and the actuator.

90 MTS Landmark™ Tabletop Load Units Product Information

Maintenance

Attach and Zero the Indicator

DescriptionItem

Read along the outside edge.1

Read along the inside edge.2

Zero3

a) Attach the dial indicator to the actuator.

On a low profile force transducer, adjust the indicator to take the reading along the edge of the loading
surface.

On cylindrical style force transducers, adjust the indicator so that its stylus just touches the inside edge
of the pilot.

Zero the dial indicator.

b) Slowly turn the actuator to rotate the indicator 360° around the force transducer.

Stop frequently to take dial indicator readings. Keep your hands off the actuator and indicator when
taking the readings. Recording the TIR readings maps the direction the transducer is off center.

Compute the TIR. Take the maximum dial indicator reading and subtract the minimum dial indicator
reading.

TIRLoad Unit Rating

> 0.038 mm (0.0015 in)25 kN (5.5 kip) or less

MTS Landmark™ Tabletop Load Units Product Information 91

Maintenance

c) If the TIR is 0.038 mm (0.0015 in) or less, the force transducer is accurately aligned with the actuator.

This completes the procedure.

If the TIR is greater than 0.038 mm (0.0015 in), the force transducer needs to be aligned with the
actuator. Continue to the next step.

4. Raise the load unit.

The load unit must be raised above the mounting surface to access the threaded fasteners of the force
transducer. The threaded fasteners are accessed from the bottom of the load unit.

a) Loosen the load unit’s legs from their mounting surface.

b) Put blocks of wood under the load unit’s legs to increase the clearance between the load unit and its

mounting surface.

c) The load must be raised high enough to use a torque wrench on the force transducer’s threaded

fasteners.

5. Adjust the force transducer alignment.

a) Loosen the force transducer just enough so that it will move when tapped by a nylon mallet.

• Loosen the threaded fastener that holds the axial force transducer.

• Loosen the eight threaded fasteners that hold the axial-torsional force transducer.

b) Based on the TIR results, tap the force transducer so it moves enough to produce an acceptable TIR

deviation.

c) Go to Step 3 on page 101 and determine if the force transducer and actuator are aligned.

• If the force transducer is accurately aligned with the actuator, finish this procedure.

• If the force transducer is not accurately aligned with the actuator, return to Step B of this step.

d) Torque the nuts (or screws) as follows.

• For an axial system, tighten the center nut only to 85 N·m (62 lb·ft).

92 MTS Landmark™ Tabletop Load Units Product Information

• For an axial-torsional system, torque the screws to 24 N·m (17 lb·ft).

6. Check the alignment again.

Take another reading to make sure the TIR remains within specifications.

• If the TIR remains within specifications, continue to the next step.

• If the TIR is out of specification, return to Step 3 in this procedure.

Maintenance

7. Lower the load unit.

Remove the blocks of wood elevating the load unit and reattach the load unit to its mounting surface.

Series 111 Accumulator: Maintenance Overview

Maintaining the proper pressure level for your accumulators is essential for optimum system performance
and component life. Review the following figure to familiarize yourself with the accumulator components and
their locations. Also review the following guidelines before performing any procedure.

Accumulator Components

DescriptionItem

Piston1

MTS Landmark™ Tabletop Load Units Product Information 93

Maintenance

DescriptionItem

Hydraulic Fluid End Cap2

Hydraulic Fluid Port3

Locking pin4

Screws5

Accumulator Valve Assembly6

Accumulator Valve Protective Cover7

Valve Stem Cap8

Locknut9

End Cap10

Chamber11

Use the following guidelines to determine when maintenance is required.

• Check the precharge pressure at periodic intervals. The length of time between checks depends on how
the system is used. Some factors to consider when establishing this time interval are operating frequency,
displacement, and duration. Start with one month intervals until you determine another interval is more
appropriate.

• Maintain a log book on the condition of the precharge at each check. Use this data to determine if the time
between checks should be increased or decreased and if maintenance is required.

• Because the precharge pressure level varies with a temperature change, the level should always be
checked at the same temperature. If it is not, use one of the following formulas to determine if the precharge
level is acceptable.

111 Accumulator Temperature Conversion

DescriptionItem

Degrees Celsius1

current pressure = original pressure x2

94 MTS Landmark™ Tabletop Load Units Product Information

Maintenance

DescriptionItem

273 + (current temperature)3

273 + (original temperature)4

Degrees Fahrenheit5

current pressure = original pressure x6

460 + (current temperature)7

460 + (original temperature)8

• If a pressure line accumulator has a pressure level change of ±1.4 MPa (200 psi) between checks, the
accumulator requires maintenance or the time interval between checks needs to be shortened.

• If a return line accumulator has a change of ±50% of the original pressure level between checks, the
accumulator requires maintenance or the time interval between checks needs to be shortened.

• If the precharge pressure level increases at each check interval, this indicates that fluid is collecting on
the gas side (a small amount of fluid leakage is normal). When the precharge pressure level cannot be
maintained within the limits, remove the fluid and charge the accumulator. If the levels are again exceeded
at the first check interval, replace the piston seals after the initial fluid has been changed.

• If the precharge pressure level decreases at each check interval, this indicates gas leakage to the fluid
side. When the precharge pressure level cannot be maintained within the limits stated in the previous
guidelines, replace the accumulator piston seals.

• During normal operation, the accumulator piston should be near the center of the accumulator cylinder.
To check the approximate piston location, note the warm-to-hot transition point on the accumulator cylinder
wall during operation. If the piston is near the charging stem end, the accumulator may need charging. If
the piston is at the other end, the accumulator may have an excess charge, or more likely an excessive
amount of hydraulic fluid has collected in the gas chamber.

Series 111 Accumulator: Check and Change Precharge Pressure

This section covers checking and changing the precharge pressure for the 111 accumulator.

Equipment

An accumulator charging kit (MTS part number 376986-01).

Prerequisites

To prepare the accumulator for precharge check:

MTS Landmark™ Tabletop Load Units Product Information 95

Maintenance

Warning:

Accumulators are pressurized devices.

Pressurized accumulators and their parts can become lethal projectiles if disassembled and can
cause death to persons and/or damage to equipment.

Do not remove an accumulator that is pressurized. Completely remove hydraulic pressure and
discharge the accumulator before any parts, except the protective cover and valve stem cap, are
removed.

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. Close the bleed valve on the accumulator charging kit. Remove the protective cover and valve stem cap
from the accumulator.

Check the Precharge Pressure

1. Connect the charging kit chuck valve to the accumulator valve stem.

96 MTS Landmark™ Tabletop Load Units Product Information

Maintenance

Checking the Precharge Pressure

DescriptionItem

Locknut1

Valve Stem2

Close3

Open4

Poppet Type Accumulator Valve. To open and close, use locknut.5

Or6

Valve Core7

Core type accumulator valve. To open and close use chuck valve.8

THESE ITEMS SUPPLIED BY USER9

20

Nitrogen Bottle Valve10

Nitrogen Bottle11

Nitrogen Bottle Pressure Gage12

Regulator Output Pressure Gage13

Regulator Shut-Off Valve14

Regulator Output Pressure Valve15

Nitrogen Supply Hose16

Input Check Valve17

Bleed Valve18

Extension Hose19

Gage Protector (factory set to limit pressure to the gage to approximately 1.4 MPa
(200 psi)

High Pressure Gage—0–21 MPa (0–3000 psi)21

Low Pressure Gage—0–2.1 MPa (0–300 psi)22

Chuck Valve23

2. With an open-end wrench, turn the locknut counterclockwise on the accumulator valve assembly to open
the valve. Read the pressure on either the high or low accumulator charging kit pressure gage.

a) If the pressure reading is other than the required pressure level recorded on the accumulator, continue

with the next subsection, “Change the Precharge Pressure”.

MTS Landmark™ Tabletop Load Units Product Information 97

Maintenance

b) If the pressure level corresponds to the level recorded on the accumulator label, turn the locknut

clockwise to close the valve and continue this procedure.

3. Open the bleed valve on the accumulator charging kit and remove the chuck valve from the accumulator.
Replace the valve stem cap and protective cover on the accumulator.

Change the Precharge Pressure

Often the precharge of an accumulator mounted on a hydraulic supply line is increased to enhance system
performance and reduce the transient HPS flow demands. Accumulators may be precharged to 10 MPa (1500
psi) or more, although amounts above 14 MPa (2200 psi) will have less and less performance effect in most
situations. Be sure that you read the following warning before you charge your accumulator.

Warning:

Accumulators have specific pressure ratings.

If the precharge pressure is too high, the accumulator can bottom out causing the release of
metal particles into the hydraulic fluid. Charging accumulators above their rated level can damage
system equipment.

Do not charge accumulators to pressures above their rated level. Charge accumulators below
their rated fatigue pressure of 21 MPa (3000 psi) for the Model 111.11B and 22 MPa (3200 psi)
for the Model 111.12C. Use a suitable regulator and gage set to an accumulator’s charges.

Decrease Pressure

To decrease the precharge pressure:

1. Slowly open the bleed valve on the accumulator charging kit until gas begins to escape. When the pressure
reading on the appropriate pressure gage drops to the level required, close the bleed valve.

2. Close the locknut (or close the chuck valve if you have a core-type valve). Open the bleed valve on the
accumulator charging kit and remove the chuck valve from the accumulator.

3. Install the valve stem cap and protective cover.

Increase Pressure

To increase the precharge pressure:

1. Close the locknut on the accumulator (or close the chuck valve for a core-type valve).

2. Open the bleed valve two turns.

98 MTS Landmark™ Tabletop Load Units Product Information

Maintenance

Warning:

Mixing gases can produce unpredictable results.

Do not use another gas to precharge an accumulator.

Use only dry nitrogen gas to precharge accumulators.

3. Connect the nitrogen supply hose from the supply bottle pressure regulator output to the input check valve
on the charging kit.

4. Open the nitrogen bottle valve. Check the nitrogen bottle pressure gage on the regulator. (The bottle must
contain sufficient pressure to provide an adequate gas volume.)

5. Monitor the regulator output pressure gage and adjust the regulator output pressure valve to the required
level.

Caution:

Rapid flow rates with pressure differentials of more than 2.1 MPa (300 psi) across the input
check valve can damage the valve seal(s).

Avoid rapid and extreme pressure transitions.

Do not allow rapid flow rates. Open the regulator shut-off valve only far enough to permit a
gradual transfer of gas.

6. Slowly open the regulator shut-off valve until gas is heard escaping from the accumulator charging kit
bleed valve. Allow gas to slowly escape for approximately ten seconds, and then close the bleed valve.
Immediately close the regulator shut-off valve before the pressure reading on either the high or low charging
kit pressure gage exceeds the pressure level of the accumulator.

7. Open the locknut (or open the chuck valve for a core-type valve). Slowly open the regulator shut-off valve
until the pressure indicator on either the high or low charging kit pressure gage begins to rise. When the
pressure is at the required pressure level (recorded on the accumulator), close the regulator shut-off valve.

8. Close the locknut (or close the chuck valve for a core type valve).

9. Open the bleed valve on the accumulator charging kit and remove the chuck valve from the accumulator.

10. Install the valve stem cap and protective cover. Close the valve on the nitrogen bottle.

Actuator

The actuator is designed for extended periods of operation without extensive maintenance requirements.

A summary of the routine maintenance procedures is listed below:

MTS Landmark™ Tabletop Load Units Product Information 99

Maintenance

Weekly

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.

Monthly

Inspect the actuator piston rod and seals for excessive wear or leakage. Small scratches in the axial direction
of the piston rod or polishing of the rod surface is considered normal operating wear.

Yearly

Change actuator seals if necessary. Actuator assemblies can require more or less frequent seal changes
depending on usage. External oil leakage and/or decreased performance are indicators of seal wear. Seal
replacement is considered a service procedure; contact your MTS Service Engineer for additional information.

Change the HSM Filter

The hydraulic service manifold filter needs to be changed periodically.

Component Identification

DescriptionItem

Dirty Filter Indicator1

Inlet Filter2

100 MTS Landmark™ Tabletop Load Units Product Information