MTS Landmark Floor Standing User Manual

MTS Landmark™ Floor Standing Load Units

Product Information

Models 370.10, 370.25, 370.50

100-184-093 F be certain.

© 2013 MTS Systems Corporation. All rights reserved.

Original Instructions (English): 100-184-093 F

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

100-184-093 F—November 2013
100-184-093 E—July 2011
100-184-093 D1—April 2011
100-184-093 D—March 2010
100-184-093 C—April 2009
100-184-093 B—June 2008
100-184-093 A—February 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

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

Component Description..........................................................................................................................30

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

Series 661 Force Transducer..................................................................................................................35

Dimensions.................................................................................................................................36

Specications.........................................................................................................................................36

Installation 37

About Installation...................................................................................................................................38

Unpacking Horizontal Conguration.....................................................................................................38

Prerequisites...............................................................................................................................38

Unpack the Load Unit (Horizontal Conguration)....................................................................39

Lifting and Moving the Load Unit.........................................................................................................42

Overview....................................................................................................................................42

Lift and Move the Load Unit......................................................................................................43

Connecting Cables..................................................................................................................................50

Prerequisite.................................................................................................................................50

Cable Connections......................................................................................................................50

Low Flow Power Supply............................................................................................................50

Connect Hydraulics................................................................................................................................52

MTS Landmark™ Floor Standing Load Units Product Information 3

Unlock the Crosshead.............................................................................................................................53

Anchoring the Load Unit........................................................................................................................55

Operation 57

Special Transducer Considerations........................................................................................................58

Control Module......................................................................................................................................58

370 Load Unit: Crush Point Hazards.....................................................................................................59

Specimen Installation.............................................................................................................................60

Install the Specimen...................................................................................................................61

Position the Crosshead Hydraulically....................................................................................................63

Position the Crosshead Manually...........................................................................................................63

Manually Clamp the Crosshead ................................................................................................66

Crosshead Clamping Bolt Torque Values...................................................................................67

Adjust the Grip Clamp Rate...................................................................................................................67

Adjust the Grip Clamp Force.................................................................................................................68

Handset Control......................................................................................................................................69

Handset Control Functions.........................................................................................................69

Standard Test Area Enclosure Operation...............................................................................................71

Hydraulic Power Off..................................................................................................................71

Specimen Installation and Setup................................................................................................71

Specimen Installation and Setup–Interrupt Operation...................................................72

Specimen Installation and Setup–Resume Operation....................................................72

Run Mode...................................................................................................................................72

Service........................................................................................................................................73

Emergency Stop and Actuator Velocity Limiting Switch..........................................................73

Interlock logic............................................................................................................................73

Maintenance 75

Routine Maintenance Overview Checklist.............................................................................................76

Other Maintenance Tasks.......................................................................................................................79

Daily Inspections....................................................................................................................................80

Clean the Columns.................................................................................................................................81

Prevent Rust...........................................................................................................................................82

Maintain Airmount Pressures.................................................................................................................84

Label Inspection.....................................................................................................................................86

Adjust the Hydraulic Locks....................................................................................................................86

Lubricate the Crosshead Locking Bolts.................................................................................................90

Aligning the Force Transducer...............................................................................................................91

Required Equipment...................................................................................................................91

Align the Force Transducer........................................................................................................92

Series 111 Accumulator: Maintenance Overview..................................................................................98

Series 111 Accumulator: Check and Change Precharge Pressure........................................................101

Equipment................................................................................................................................101

4 MTS Landmark™ Floor Standing Load Units Product Information

Prerequisites.............................................................................................................................101

Check the Precharge Pressure..................................................................................................101

Change the Precharge Pressure................................................................................................103

Decrease Pressure.........................................................................................................104

Increase Pressure .........................................................................................................104

Actuator................................................................................................................................................105

Change the HSM Filter........................................................................................................................106

Change the HSM Filter............................................................................................................107

252 Servovalve.....................................................................................................................................107

Replacing the Servovalve Filter Element.................................................................................107

Replace the Servovalve Filter Element....................................................................................108

Adjusting the Mechanical Null.................................................................................................110

Adjust the Mechanical Null......................................................................................................110

Performing Sensor Calibration.............................................................................................................113

Decommissioning 115

Decommission the System...................................................................................................................116

Declarations 119

Declaration of Conformity...................................................................................................................120

Declaration of Incorporation................................................................................................................123

MTS Landmark™ Floor Standing 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™ Floor Standing 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™ Floor Standing 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™ Floor Standing 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™ Floor Standing 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™ Floor Standing 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™ Floor Standing 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™ Floor Standing 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™ Floor Standing 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™ Floor Standing 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™ Floor Standing 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™ Floor Standing 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™ Floor Standing 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™ Floor Standing 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™ Floor Standing 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™ Floor Standing 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™ Floor Standing 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™ Floor Standing 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™ Floor Standing Load Units Product Information 25

Introduction

Topics:

•

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

•

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

•

Component Description.........................................................................................................................30

•

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

•

Series 661 Force Transducer.................................................................................................................35

•

Specifications.........................................................................................................................................36

MTS Landmark™ Floor Standing Load Units Product Information 27

Introduction

Overview

The load unit is the primary structure for most materials testing. It is a stand-alone testing unit. The load unit
consists of the load frame plus additional parts, such as hydraulic crosshead lifts and control modules. Load
units come in different sizes and shapes. The following illustration shows typical load units with common
accessories.

The load units are designed to perform tension and compression tests, fatigue and fracture mechanics tests,
as well as other tests. MTS manufactures a variety of grips, mounting fixtures, test area guards, and
environmental chambers that can be used with the load unit.

MTS Landmark Load Units

DescriptionItem

Actuator integral to base1

Actuator integral to cross head2

28 MTS Landmark™ Floor Standing Load Units Product Information

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.

• Zero a sensor signal.

• Zero a sensor output.

• Use your grips and fixtures.

• Define a simple test.

• Run a test.

Introduction

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.

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,

MTS Landmark™ Floor Standing Load Units Product Information 29

Introduction

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.

Component Description

30 MTS Landmark™ Floor Standing Load Units Product Information

Introduction

Component Descriptions

DescriptionComponentItem

Front ViewA
Back ViewB

Crosshead1

Crosshead locks2

Crosshead lifts3

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.

Clamps the crosshead to the columns. The locks are typically
hydraulically powered.

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

MTS Landmark™ Floor Standing Load Units Product Information 31

Introduction

DescriptionComponentItem

Control panel4

Grip controls

Crosshead lifts control

Crosshead locks control

Actuator velocity limiting switch

Emergency Stop

Handset

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

Clamp and unclamp the hydraulically controlled grips during specimen
installation and removal. Also provide a pressure adjustment to control
grip clamping force and a rate adjustment that controls how fast the
grips secure the specimen.

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

Controls the crosshead locks to lock and unlock the crosshead
hydraulically.

Controls actuator rod speed. There are two positions: one for reduced
speed of the actuator rod for specimen installation and one for normal,
high-speed testing operation.

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

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.

Servovalve5

Isolation pads6

Accumulators7

LVDT8

Manifold9

Filter10

Linear actuator11

Controls both the flow rate and the direction of fluid entering the
actuators. It determines how fast the actuator extends or retracts.

Reduce transmission of vibrations. Fabcell® pads dampen the natural
frequency to about 20 Hz. Optional pneumatic/elastomeric isolators
dampen the natural frequency to about 2 Hz.

Store hydraulic fluid under pressure to modulate the actuator
response time during periods of hydraulic pressure fluctuations. One
accumulator connects to the pressure line; the other to the return
line.

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

Serves as the junction point between the hydraulic power unit (HPU),
accumulators, servovalve, and actuator. The actuator manifold
controls the hydraulic circuit that connects the hydraulic components.

The 10-micron inlet filter prevents passage of dirt particles into the
servovalve(s).

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.

Measures the axial forces applied to the specimen.Force transducer12

32 MTS Landmark™ Floor Standing Load Units Product Information

Introduction

DescriptionComponentItem

Lift points13

Allows the load unit to be moved by lifting the entire load unit. For
load units with the actuator integral to the base, hoist rings are
provided in the crosshead. For load units with the actuator integral
to the crosshead, slings should be used under the crosshead on each
side of the actuator.

Functional Description

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

• Load frame

• Crosshead lifts and locks

• Integral actuator assembly

• Actuator

• Servovalve(s)

• Accumulators

• Pressure control

• Transducers

• Grip controls

Load frame

The load frame provides the reaction structure for the force train. The base of the load frame is one side of
the reaction structure and the crosshead is the other side of the reaction structure. The columns complete
the structure. Installing a specimen and other fixtures or components within the structure creates a force train.

The load frame and the other hydraulic components mounted to it collectively create the load unit. Typically,
the base houses the integral actuator assembly (that includes the servovalves and hydraulic manifold).
Typically, the crosshead is mounted above the base by two columns. In some configurations, the integral
actuator beam can be crosshead-mounted.

A control panel lets you operate the crosshead lifts, locks, and grips to assist in specimen installation
procedures. The control panel also contains the Emergency Stop switch and the actuator rod speed control.

Automated crosshead positioning

The crosshead can be positioned anywhere along the load frame columns. This lets you change the load unit
to test specimens of different lengths. It is moved along the columns with hydraulic pressure to both lift and
lower the crosshead; the crosshead has a counterbalance circuit to prevent falling in the event of hydraulic
pressure loss. When the crosshead is in an appropriate test position, it is hydraulically clamped to that position.

Grip controls

The grip controls provide independent clamping control of the upper and lower grips. For most load units, the
pressure is factory set to 21 MPa (3000 psi). There are also optional grip pressures of 45 MPa (6500 psi) or

MTS Landmark™ Floor Standing Load Units Product Information 33

Introduction

69 MPa (10,000 psi) to accommodate a variety of grips manufactured by MTS Systems Corporation. A front
panel control allows the grip pressure to be adjusted within the factory setting. A rate control sets how fast
the grips open and close.

Actuator velocity limiting switch

This switch/indicator is used to control actuator speed. The switch is spring loaded left/right with a center
neutral position. Momentarily turn the switch right to the hare and then return the switch to the center position
for high-speed, normal testing operation. The switch indicator will light, indicating the actuator rod is capable
of high-speed, normal testing operation. Momentarily turn the switch left to the tortoise and then return the
switch to the center position for low-speed specimen installation and removal. The switch indicator will
extinguish, indicating the actuator rod is in a low speed condition for specimen installation.

Integrated actuator assembly

The integral actuator beam includes the hydraulic service manifold (HSM) that acts as the hydraulic interface
between the HPU and the components that comprise the actuator beam [actuator, servovalve(s), and
accumulators] of the load unit. It contains the required hydraulic porting and piping to accommodate the
hydraulic components. The HSM and the actuator speed control also controls the hydraulic pressure to the
load unit.

• Actuator: The actuator can be located in the middle of the load unit base or 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 which is mounted to the end of
the actuator rod.

• Servovalve(s): The servovalve(s) regulates the direction and flow of the hydraulic fluid to and from a
hydraulic actuator. The servovalve responds to the polarity and magnitude of the command signal generated
by the controller.

• Accumulators: The accumulators suppress line-pressure fluctuations. The load unit includes a pressure-line
accumulator to provide fluid storage so 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. The free flow
configuration passes the hydraulic pressure from the HPU (or hydraulic service manifold) through the
manifold to the hydraulic components. The hydraulic pressure options include on/off control, high/low/off
control, and high/low/off control with a proportional valve to ramp the pressure transitions.

Transducers

The load unit includes a force transducer and an LVDT.

• Force: The force transducer (also called load cell or force sensor) measures the amount of tension or
compression and rotational torque 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 force transducer is a resistive device and requires a DC
conditioner to process the axial signal from the 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.

34 MTS Landmark™ Floor Standing Load Units Product Information

Series 661 Force Transducer

The force transducer commonly used with the Model 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

15 V DCMaximum excitation voltage

350 ¾Bridge resistance

1.0% of full scale torsional to loadMaximum crosstalk

0.08% of full scale (250 N–2.5 kN)Hysteresis

0.05% of full scale (5 kN–50 kN)

0.15% of full scale (100 kN–500 kN)

0.20% of full scale (1000 kN)

Introduction

non-TEDS

0.08% of full scaleNonlinearity

0.15% of full scale for Models 661.22/.23/.31

0.004% of reading/°C (0.002%/°F)Temperature

-54°C to +121°C (-65 °F to +250 °F)Usable range

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

0.0036% of full scale/°C (0.0020% or full scale/°F)Sensitivity

2 mV/V at full-scale loadOutput

JT,RCPT,13PIN #10,BOX MNT,.719MTPATConnector

PT02ER-10-6PTEDS

WeightThread SizeLoad CapacityModel

9.75 kg (21.5 lb)M27 x 2.0 mm x 31.7 mm25 kN (5.5 kip)661.20-01

9.75 kg (21.5 lb)M27 x 2.0 mm x 31.7 mm50 kN (11 kip)661.20-02

9.75 kg (21.5 lb)M27 x 2.0 mm x 31.7 mm100 kN (22 kip)661.20-03

13.2 kg (29 lb)M36 x 2.0 mm250 kN (55 kip)661.22-01

16 kg (35.3 lb)M52 x 2.0 mm x 48.3 mm500 kN (110 kip)661.23-01

MTS Landmark™ Floor Standing Load Units Product Information 35

Introduction

Dimensions

The following dimensions are rounded off to the nearest millimeter.

Series 661 Force Transducer Dimensions

661.20-01

661.22-01

661.23-01

AModel

in)

in)

152 mm (5.98
in)

in)

1

CB

2

1 mm (0.03 in)92 mm 3.62 in)114 mm (4.48

in)

N/A140 mm (5.51

in)

ED

89 mm (3.5 in)95 mm (3.74 in)10 mm (0.39 in)57 mm (2.24 in)154 mm (6.06

74 mm (2.91 in)203 mm (7.99

86 mm (3.38 in)203 mm (7.99

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.”

2

This dimension applies to both ends.

1

This dimension applies to both ends.

36 MTS Landmark™ Floor Standing Load Units Product Information

Installation

Topics:

•

About Installation...................................................................................................................................38

•

Unpacking Horizontal Configuration......................................................................................................38

•

Lifting and Moving the Load Unit...........................................................................................................42

•

Connecting Cables................................................................................................................................50

•

Connect Hydraulics................................................................................................................................52

•

Unlock the Crosshead...........................................................................................................................53

•

Anchoring the Load Unit........................................................................................................................55

MTS Landmark™ Floor Standing Load Units Product Information 37

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.

Unpacking Horizontal Configuration

Note:

Illustrations show a typical load unit. Some load units can be packaged control panel down. However,
regardless of orientation, the following instructions can be used.

Prerequisites

The load unit is shipped horizontally on a wooden pallet. You will need the following equipment to unpack
the load unit:

• Lifting slings—not chains—to lift the load unit from its pallet

• Rubber mats for the load unit’s feet to rest on

• Drill with a Phillips bit to unscrew blocking

• Wooden blocks for the load unit’s columns to rest on

• Depending on the straps, a knife or band cutter to cut the packing straps

Warning:

The load unit is extremely 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. Observe the following precautions:

Unpacking the Load Unit

38 MTS Landmark™ Floor Standing Load Units Product Information

Unpack the Load Unit (Horizontal Configuration)

1. Cut the packing straps and remove any bolts as needed. Make sure the lifting eyebolts are tight.

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

• Scratches in the load unit or lift cylinder columns

• 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 HELPLine
at 1-800-328-2255. Elsewhere, contact your local MTS office.

3. Lift the load unit upright.

a) Attach the lifting hooks to the lifting eyebolts for actuator integral to the base models, or attach slings

around the crosshead for actuator integral to the crosshead models. Move the crane/forklift to keep
the chains as perpendicular to the floor as possible.

Installation

b) Slowly raise the load unit to its upright position. As the unit rises, keep moving the crane to keep the

chains as perpendicular to the floor as possible. Do not exceed a 30° chain angle.

c) Use caution when passing the center of gravity.

d) Once the load unit is upright, raise it slightly so that the pallet can be removed.

MTS Landmark™ Floor Standing Load Units Product Information 39

Installation

Lift the Load Unit Upright

DescriptionItem

Crane Travel1

30° Maximum2

4. Move the load unit to its final position.

Before you move the load unit, ensure that:

• 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 harm’s

way.

• The eyebolts are tight.

• The crosshead is manually locked.

Lift the load unit only as high as necessary.

5. Place the load unit onto the isolation pads or airmounts.

40 MTS Landmark™ Floor Standing Load Units Product Information

Installation

• 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.

• If your load unit has airmounts, inflate each airmount in 5 mm (0.20 in) increments to level the load

unit.

• Check the airmounts’ pressures often to ensure that they do not exceed 0.55 MPa (80 psi).

• Check the airmounts’ inflated heights to ensure that they are all between 83 and 88 mm (3.25 and

3.5 in).

• Adjust the air pressure to level 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 0.55 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).

Isolation Pad or Airmount Adjustment

DescriptionItem

Airmount Foot Support1

Isolation Pads2

Load Unit3

83-89 mm (3.25–3.5 in)4

0.55 MPa (80 psi)5

Install shims to level.6

MTS Landmark™ Floor Standing Load Units Product Information 41

Installation

6. Remove the chains.

7. 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.

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

42 MTS Landmark™ Floor Standing 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™ Floor Standing Load Units Product Information 43

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.

44 MTS Landmark™ Floor Standing 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™ Floor Standing Load Units Product Information 45

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

46 MTS Landmark™ Floor Standing 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™ Floor Standing Load Units Product Information 47

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.

48 MTS Landmark™ Floor Standing 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™ Floor Standing Load Units Product Information 49

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 force transducer is connected to a DC conditioner in the controller.

• 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.

• The load unit control panel is connected to the controller. It contains the emergency stop and crosshead
lock signals.

• The servovalve is connected to a valve driver in the controller.

• The actuator manifold is connected to the hydraulic service manifold (HSM) connector on the controller.
The actuator manifold may 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) is connected
to an AC conditioner in the controller.

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.

50 MTS Landmark™ Floor Standing 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™ Floor Standing Load Units Product Information 51

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.

52 MTS Landmark™ Floor Standing 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.

Important:

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 actuator end cap (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™ Floor Standing Load Units Product Information 53

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.

54 MTS Landmark™ Floor Standing 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.

Anchoring the Load Unit

In some situations, it might be necessary to anchor the load unit to the floor. It is possible, though uncommon,
for the load unit to creep during some types of testing. An example would be high frequency testing within
the floor’s resonant frequency range. Contact MTS for additional information.

MTS Landmark™ Floor Standing Load Units Product Information 55

Operation

Topics:

•

Special Transducer Considerations.......................................................................................................58

•

Control Module.......................................................................................................................................58

•

370 Load Unit: Crush Point Hazards.....................................................................................................59

•

Specimen Installation.............................................................................................................................60

•

Position the Crosshead Hydraulically....................................................................................................63

•

Position the Crosshead Manually..........................................................................................................63

•

Adjust the Grip Clamp Rate...................................................................................................................67

•

Adjust the Grip Clamp Force.................................................................................................................68

•

Handset Control.....................................................................................................................................69

•

Standard Test Area Enclosure Operation..............................................................................................71

MTS Landmark™ Floor Standing Load Units Product Information 57

Operation

Special Transducer Considerations

Special considerations must be followed when using low force transducers in a high force system. Small force
transducers are commonly used in larger systems. You need to be aware that the load unit can produce
forces that exceed the rating of the low force transducer.

Caution:

Low force transducers in a high force system can be exposed to excessive forces.

Applying forces that exceed the rated capacity of the force transducer can damage the transducer.

Ensure that all test commands are within the force transducer’s rating when it is installed. Your
warranty does not cover damage caused by a high force actuator.

MTS recommends the following:

• Position the crosshead so that fixtures cannot touch each other when the actuator is fully extended. This
may not be feasible at all times, but it should be practiced whenever possible.

• Use force limits. Force limits can help in some instances, but might not stop the actuator fast enough in
all situations.

• Ensure that you have selected the correct calibration for the transducer being used. Also ensure that the
system tuning has been optimized for the transducer being used.

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.

58 MTS Landmark™ Floor Standing Load Units Product Information

Series 370 Load Unit Controls

DescriptionControlItem

Operation

1

2

4

5

Upper Hydraulic Grip
Controls

Lower Hydraulic Grip
Controls

Grip Pressure Adjust3

Crosshead Lock/Unlock
Control

Crosshead Positioning
Control

Emergency Stop6

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.

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

370 Load Unit: Crush Point Hazards

It is important to stay clear of any potential crush points when the system is operating. Know where the crush
points are in your system and protect yourself and others from those crush points with appropriate safety
devices. The following paragraphs describe crush points and precautions to take while working around crush
points.

MTS Landmark™ Floor Standing Load Units Product Information 59

Operation

Crush Point Area

DescriptionItem

Crush Point Area1

Location

A crush point exists between the platen and crosshead on load units where the actuator piston rod and
specimen move.

Precautions

Keep clear of any mechanical linkage that moves within a closed area. If the linkage should move (when the
system starts or due to mechanical failure), very high forces can be present that could pinch, cut, or crush
anything in the path of linkage movement.

Never allow any part of your body to enter the path of machine movement or to touch moving machinery,
linkages, hoses, cables, specimens, et cetera. These present serious crush points or pinch points.

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.

60 MTS Landmark™ Floor Standing Load Units Product Information

Operation

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.

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.

MTS Landmark™ Floor Standing Load Units Product Information 61

Operation

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.

• 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.

62 MTS Landmark™ Floor Standing Load Units Product Information

Position the Crosshead Hydraulically

1. Important:

This step pressurizes the lift actuators. The crosshead might have shifted position while hydraulic
pressure was turned off.

Briefly turn the crosshead positioning control to the lift crosshead position to apply a slight upward pressure
to the crosshead. Then return the lift control to the stop position.

2. Use the crosshead lock/unlock control to unlock the crosshead.

Wait 5 seconds for the pressure in the crosshead locks to drop to zero.

3. Use the crosshead positioning 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.

Return the control to its center position before proceeding.

Operation

4. Use the crosshead lock/unlock control to clamp the crosshead in its current position.

Wait 5 seconds for the locks to fully clamp the columns.

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™ Floor Standing Load Units Product Information 63

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

64 MTS Landmark™ Floor Standing 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™ Floor Standing Load Units Product Information 65

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.

66 MTS Landmark™ Floor Standing 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

3

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.

3

This step ensures uniform tightness.

MTS Landmark™ Floor Standing Load Units Product Information 67

Operation

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.

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.

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.

68 MTS Landmark™ Floor Standing Load Units Product Information

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.

Handset Control

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.

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.

MTS Landmark™ Floor Standing Load Units Product Information 69

Operation

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

Scroll Highlight3

Thumb-Wheel4

Pause5

Stop6

70 MTS Landmark™ Floor Standing Load Units Product Information

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.

Operation

DescriptionControl/IndicatorItem

RJ-45, to Controller.Connector7

Shuts down the HPU.Hydraulic Off8

15

Start9

Interlock Reset10

Thumbwheel Enable11

Handset Enable13

Display

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.

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

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.

MTS Landmark™ Floor Standing Load Units Product Information 71

Operation

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.

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.

72 MTS Landmark™ Floor Standing Load Units Product Information

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.

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.

Operation

Interlock logic

The interlock logic is as follows:

Enclosure Controls

DescriptionItem

Emergency Stop Switch1

Actuator Velocity Limiting Switch2

MTS Landmark™ Floor Standing Load Units Product Information 73

Operation

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

74 MTS Landmark™ Floor Standing Load Units Product Information

Maintenance

Topics:

•

Routine Maintenance Overview Checklist.............................................................................................76

•

Other Maintenance Tasks......................................................................................................................79

•

Daily Inspections....................................................................................................................................80

•

Clean the Columns................................................................................................................................81

•

Prevent Rust..........................................................................................................................................82

•

Maintain Airmount Pressures.................................................................................................................84

•

Label Inspection.....................................................................................................................................86

•

Adjust the Hydraulic Locks....................................................................................................................86

•

Lubricate the Crosshead Locking Bolts.................................................................................................90

•

Aligning the Force Transducer...............................................................................................................91

•

Series 111 Accumulator: Maintenance Overview...................................................................................98

•

Series 111 Accumulator: Check and Change Precharge Pressure.....................................................101

•

Actuator................................................................................................................................................105

•

Change the HSM Filter........................................................................................................................106

•

252 Servovalve....................................................................................................................................107

•

Performing Sensor Calibration.............................................................................................................113

MTS Landmark™ Floor Standing Load Units Product Information 75

Maintenance

Routine Maintenance Overview Checklist

Recommended service to be performed at each running time interval noted

Time Rate Per Day

4

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

5

MTSMTSMTSMTSMTS

MTSMTSMTSMTSMTSEnsure that the lift seal condition is dry.

MTSMTSMTSMTSMTSEnsure that the lock seal condition is dry.

4

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.

5

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.

76 MTS Landmark™ Floor Standing 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.

6

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.

6

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

MTS Landmark™ Floor Standing Load Units Product Information 77

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.

78 MTS Landmark™ Floor Standing 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™ Floor Standing Load Units Product Information 79

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.

80 MTS Landmark™ Floor Standing 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™ Floor Standing Load Units Product Information 81

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.

82 MTS Landmark™ Floor Standing Load Units Product Information

Maintenance

MTS Landmark™ Floor Standing Load Units Product Information 83

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).

84 MTS Landmark™ Floor Standing 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™ Floor Standing Load Units Product Information 85

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.

86 MTS Landmark™ Floor Standing 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™ Floor Standing Load Units Product Information 87

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.

88 MTS Landmark™ Floor Standing 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™ Floor Standing Load Units Product Information 89

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

90 MTS Landmark™ Floor Standing 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

This section describes how to align a force transducer with the load unit actuator. The load units shown may
vary from what you may have.

The Model 370.10 and some 370.25 Load Units come with two types of transducer mounting hardware. One
preloads the force transducer with a hex nut; the other uses a preloader collar with jackbolts or captive set
screws.

Maintenance

The Model 370.50 and some 370.25 Load Units use a preloader collar with six or eight internal jackbolts to
preload the force transducer.

Required Equipment

• Torque wrench with a 5–135 N·m (5–100 lbf·ft) range

• Molykote G·n paste

• Rubber mallet

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

MTS Landmark™ Floor Standing Load Units Product Information 91

Maintenance

Align the Force Transducer

Preloader Hardware

DescriptionItem

Identification Plate1

Stud2

Hex Nut3

Washer4

Adapter Bushing5

Preloaded Collar6

Crosshead7

Transducer (appearance can vary)8

The identification plate specifies the final torque value.9

1. Prepare the system:

92 MTS Landmark™ Floor Standing Load Units Product Information

Maintenance

a) If grips are installed, remove them.

b) Turn on system electrical power.

c) Turn on high hydraulic pressure.

2. Set up the load unit:

a) Position the actuator at midstroke.

b) Set and enable the test controller’s upper and lower limit detect interlocks to limit the actuator’s

movement to 2 mm (0.10 in) in each direction.

c) Move the crosshead so that there is about 360 mm (14 in) between the top of the actuator and the

bottom of the force transducer.

d) Lock the crosshead.

Caution:

Alignment takes place in a crush zone with hydraulic pressure on.

Hands can be crushed and equipment can be damaged when hydraulics are turned on.
Be careful when working in a crush zone.

Observe the following to reduce the hazards in this procedure:

Ensure that you set and enable displacement interlocks to limit the actuator’s movement.

Ensure that the crosshead is locked.

Reduce the load unit’s hydraulic pressure to low.

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

e) Turn the load unit’s hydraulic pressure to high.

3. Check the alignment between the force transducer and the actuator.

MTS Landmark™ Floor Standing Load Units Product Information 93

Maintenance

Attaching and Zeroing the Indicator

DescriptionItem

Read along the edge.1

Zero2

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 a cylindrical style force transducer, adjust the indicator so that its stylus just touches the polished
bottom edge of the transducer.

b) Zero the indicator.

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

Stop frequently to take indicator readings. Keep your hands off the actuator and indicator when taking
the readings. Compute the total indicator runout (TIR). Take the maximum dial indicator reading and
subtract the minimum dial indicator reading.

Load Unit Ratings

TIRLoad Unit Rating

> 0.038 mm (0.0015 in)250 kN (55 kip) or

less

94 MTS Landmark™ Floor Standing Load Units Product Information

Maintenance

TIRLoad Unit Rating

0.051 mm (0.0020 in)500 kN (100 kip)

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

Go to Step 6.

If the TIR is greater than 0.038 mm (0.0015 in), the force transducer needs to be aligned with the
actuator. Start over with Step 3.

4. If you have a force transducer that is mounted to the crosshead with a single nut, perform the following
substeps.

a) Put blocks of wood between the actuator and the force transducer. They will support the force transducer

when its mounting nut is loosened.

b) Loosen the mounting nut. Lubricate the exposed stud threads and washer with Molykote G·n paste.

c) Tighten the mounting nut just enough to pull the force transducer firmly against the crosshead.

d) Remove the wood blocks. Reinstall and zero the indicator.

MTS Landmark™ Floor Standing Load Units Product Information 95

Maintenance

Lubricating the Hex Nut

DescriptionItem

Tighten.1

G-n Paste2

Wooden Blocks3

5. If you have a force transducer that is mounted to the crosshead using a preloader collar, perform the
following substeps.

a) Loosen the six jack bolts or setscrews in 1/4 turn steps to remove most of the tension on the preloader

collar, following a standard crisscross torque sequence.

b) If your preloader collar has jackbolts, remove and lubricate them one at a time. Lubricate the washer

underneath the jackbolt. After you reinstall the jackbolt, tighten it enough to keep the force transducer
pulled firmly against the crosshead.

c) If your preloader collar has captive setscrews, unscrew them one at a time. Lubricate the washer

underneath the setscrew. Then retighten the setscrew just enough to keep the force transducer pulled
firmly against the crosshead.

96 MTS Landmark™ Floor Standing Load Units Product Information

Maintenance

Preloader Collar Bolts

DescriptionItem

Remove one at a time1

G-n Paste2

6. Align the force transducer to the crosshead:

a) Lightly tap the transducer with the rubber mallet to change its position until you get a TIR of 0.038 mm

(0.0015 in) or less.

b) Tighten to 5% of the torque recorded on the identification plate.

Hex nut—Tighten the nut to 5% of the final torque shown on the identification plate.

Preloader collar—Tighten the jackbolts or setscrews to 5% of the final torque shown on the identification

plate.

c) Rotate the indicator to see if the TIR is still 0.038 mm (0.0015 in) or less. If not, loosen the nut or

preloader collar and return to Step 4. (Loosen the preloader collar using the following sequence.)

MTS Landmark™ Floor Standing Load Units Product Information 97

Maintenance

Bolt Torque Sequence

d) Repeat Steps B and C to tighten the force transducer for the following torque progression: 50%, 75%,

and 100%.

e) Preloader collar only—For uniform tightness, retorque the jackbolts or setscrews to 100% of the final

torque shown on the identification plate.

Torque RatingActuator Force Rating

3.7 N·m (2.7 lbf·ft)25 kN (5.5 kip)

48 N·m (35 lb·ft)11–500 kN (11–110 kip)

7. Finish the procedure.

a) Remove the dial indicator.

b) If you reduced pressure at the hydraulic power unit, restore full hydraulic pressure.

c) Turn the load unit’s hydraulic pressure to off.

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.

98 MTS Landmark™ Floor Standing Load Units Product Information

Maintenance

Accumulator Components

DescriptionItem

Piston1

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.

MTS Landmark™ Floor Standing Load Units Product Information 99

Maintenance

111 Accumulator Temperature Conversion

DescriptionItem

Degrees Celsius1

current pressure = original pressure x2

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.

100 MTS Landmark™ Floor Standing Load Units Product Information