MTS 256 User Manual

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Series 256 Servovalve Product Information
Model 256.04 Model 256.05 Model 256.09 Model 256.18 Model 256.25 Model 256.40
011-209-602 G
Page 2
Copyright information © 1992, 2000, 2002, 2008 MTS Systems Corporation. All rights reserved.
Trademark information MTS is a registered trademark of MTS Systems Corporation within the United
States. This trademark may be protected in other countries.
DTE is a registered trademark of Mobil Corporation.
Tellus is a registered trademark of Shell Oil Corporation
Publication information
Manual Part Number Publication Date
011-209-602 C December 1992
011-209-602 D March 2000
011-209-602 E October 2002
011-209-602 F March 2008
011-209-602 G April 2009
Series 256 Servovalve Product Information
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Contents
Technical Support 5
How to Get Technical Support 5
Before You Contact MTS 5
If You Contact MTS by Phone 6
Problem Submittal Form in MTS Manuals 7
Preface 9
Before You Begin 9
Conventions 10
Documentation Conventions 10
Introduction 13
About the Servovalve 14
Servovalve Functional 14
Series 256 Servovalve—Multiple Stages 16
Specifications 17
Series 256 Servovalve General Specifications 17
Static Performance Specifications 18
Dynamic Performance Specifications 18
Series 256 Servovalve Performance Characteristics 19
Installation 23
How to Mount the Main Stage 23
How to Mount the Pilot Stage 24
How to Connect the Cables 26
Series 256 Servovalve Product Information Contents
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Contents
Series 256 Servovalve Product Information
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Technical Support

How to Get Technical Support

Start with your
manuals
Technical support
methods
MTS web site
www.mts.com
E-mail techsupport@mts.com
Telephone MTS Call Center 800-328-2255
Fax 952-937-4515
The manuals supplied by MTS provide most of the information you need to use and maintain your equipment. If your equipment includes MTS software, look for online help and README files that contain additional product information.
If you cannot find answers to your technical questions from these sources, you can use the internet, e-mail, telephone, or fax to contact MTS for assistance.
MTS provides a full range of support services after your system is installed. If you have any questions about a system or product, contact MTS in one of the following ways.
The MTS web site gives you access to our technical support staff by means of a Technical Support link:
www.mts.com > Contact Us > Service & Technical Support
Weekdays 7:00 A.M. to 5:00 P.M., Central Time
Please include “Technical Support” in the subject line.

Before You Contact MTS

MTS can help you more efficiently if you have the following information available when you contact us for support.
Know your site
number and system
number
Series 256 Servovalve Product Information Technical Support
The site number contains your company number and identifies your equipment type (material testing, simulation, and so forth). The number is usually written on a label on your MTS equipment before the system leaves MTS. If you do not have or do not know your MTS site number, contact your MTS sales engineer.
Example site number: 571167
When you have more than one MTS system, the system job number identifies which system you are calling about. You can find your job number in the papers sent to you when you ordered your system.
Example system number: US1.42460
Page 6
Know information from
prior technical
If you have contacted MTS about this problem before, we can recall your file. You will need to tell us the:
assistance
MTS notification number
Name of the person who helped you

Identify the problem Describe the problem you are experiencing and know the answers to the

following questions:
How long and how often has the problem been occurring?
Can you reproduce the problem?
Were any hardware or software changes made to the system before the
problem started?
What are the model numbers of the suspect equipment?
What model controller are you using (if applicable)?
What test configuration are you using?
Know relevant
computer information
Know relevant
software information
If you are experiencing a computer problem, have the following information available:
Manufacturer’s name and model number
Operating software type and service patch information
Amount of system memory
Amount of free space on the hard drive in which the application resides
Current status of hard-drive fragmentation
Connection status to a corporate network
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 is displayed briefly when you launch the application, and can typically be found in the “About” selection in the “Help” menu.
It is also helpful if the names of other non-MTS applications that are
running on your computer, such as anti-virus software, screen savers, keyboard enhancers, print spoolers, and so forth are known and available.

If You Contact MTS by Phone

Your call will be registered by a Call Center agent if you are calling within the United States or Canada. Before connecting you with a technical support specialist, the agent will ask you for your site number, name, company, company address, and the phone number where you can normally be reached.
Technical Support
Series 256 Servovalve Product Information
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If you are calling about an issue that has already been assigned a notification number, please provide that number. You will be assigned a unique notification number about any new issue.

Identify system type To assist the Call Center agent with connecting you to the most qualified

technical support specialist available, identify your system as one of the following types:
Electromechanical materials test system
Hydromechanical materials test system
Vehicle test system
Vehicle component test system
Aero test system
Be prepared to
Prepare yourself for troubleshooting while on the phone:
troubleshoot
Call from a telephone when you are close to the system so that you can try
implementing suggestions made over the phone.
Have the original operating and application software media available.
If you are not familiar with all aspects of the equipment operation, have an
experienced user nearby to assist you.
Write down relevant
Prepare yourself in case we need to call you back:
information
Remember to ask for the notification number.
Record the name of the person who helped you.
Write down any specific instructions to be followed, such as data recording
or performance monitoring.

After you call MTS logs and tracks all calls to ensure that you receive assistance and that action

is taken regarding your problem or request. If you have questions about the status of your problem or have additional information to report, please contact MTS again and provide your original notification number.

Problem Submittal Form in MTS Manuals

Use the Problem Submittal Form to communicate problems you are experiencing with your MTS software, hardware, manuals, or service which have not been resolved to your satisfaction through the technical support process. This form includes check boxes that allow you to indicate the urgency of your problem and your expectation of an acceptable response time. We guarantee a timely response—your feedback is important to us.
The Problem Submittal Form can be accessed:
In the back of many MTS manuals (postage paid form to be mailed to MTS)
www.mts.com > Contact Us > Problem Submittal Form (electronic form to
be e-mailed to MTS)
Series 256 Servovalve Product Information Technical Support
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Technical Support
Series 256 Servovalve Product Information
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Preface

Before You Begin

Safety first! Before you attempt to use your MTS product or system, read and understand the

Safety manual and any other safety information provided with your system. Improper installation, operation, or maintenance of MTS equipment in your test facility can result in hazardous conditions that can cause severe personal injury or death and damage to your equipment and specimen. Again, read and understand the safety information provided with your system before you continue. It is very important that you remain aware of hazards that apply to your system.

Other MTS manuals In addition to this manual, you may receive additional MTS manuals in paper or

electronic form.
If you have purchased a test system, it may include an MTS System Documentation CD. This CD contains an electronic copy of the MTS manuals that pertain to your test system, including hydraulic and mechanical component manuals, assembly drawings and parts lists, and operation and preventive maintenance manuals. Controller and application software manuals are typically included on the software CD distribution disc(s).
Series 256 Servovalve Product Information Preface
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Conventions

DANGER
WARNING
CAUTION
Conventions

Documentation Conventions

The following paragraphs describe some of the conventions that are used in your MTS manuals.
Hazard conventions As necessary, hazard notices may be embedded in this manual. These notices
contain safety information that is specific to the task to be performed. Hazard notices immediately precede the step or procedure that may lead to an associated hazard. Read all hazard notices carefully and follow the directions that are given. Three different levels of hazard notices may appear in your manuals. Following are examples of all three levels.
Note For general safety information, see the safety information provided with
your system.
Danger notices indicate the presence of a hazard with a high level of risk which, if ignored, will result in death, severe personal injury, or substantial property damage.
Warning notices indicate the presence of a hazard with a medium level of risk which, if ignored, can result in death, severe personal injury, or substantial property damage.
Caution notices indicate the presence of a hazard with a low level of risk which, if ignored, could cause moderate or minor personal injury, equipment damage, or endanger test integrity.
Notes Notes provide additional information about operating your system or highlight
easily overlooked items. For example:
Note Resources that are put back on the hardware lists show up at the end of
the list.
Special terms The first occurrence of special terms is shown in italics.
Illustrations Illustrations appear in this manual to clarify text. It is important for you to be
Electronic manual
conventions
Preface
10
aware that these illustrations are examples only and do not necessarily represent your actual system configuration, test application, or software.
This manual is available as an electronic document in the Portable Document File (PDF) format. It can be viewed on any computer that has Adobe Acrobat Reader installed.
Series 256 Servovalve Product Information
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Conventions
Hypertext links The electronic document has many hypertext links displayed in a blue font. All
blue words in the body text, along with all contents entries and index page numbers, are hypertext links. When you click a hypertext link, the application jumps to the corresponding topic.
Series 256 Servovalve Product Information Preface
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Conventions
12
Preface
Series 256 Servovalve Product Information
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Introduction

Contents Servovalve Functional 14

MTS Series 256 Servovalves regulate the rate and direction of hydraulic fluid flow to and from hydraulic actuators requiring from 113–1500 L/min (30–400 gpm) of fluid flow.
Series 256 Servovalve—Multiple Stages 16
Specifications 17
Series 256 Servovalve
What you need to
know
Series 256 Servovalve Product Information Introduction
MTS Systems Corporation assumes that you know how to use your controller. See the appropriate manual for information about performing any controller­related step in this manual’s procedures. You are expected to know how to perform the following procedures:
Turn hydraulic pressure on and off.
Select a control mode.
Manually adjust the actuator position.
You should have experience installing or servicing servohydraulic
equipment.
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Related products The Series 256 Servovalves includes a Series 252 Servovalve. See the Series 252

Test
Command
Control
Signal
Inner Loop
Outer Loop
Manifold
Hydraulic
Power
Unit
Valve Driver
Feedback
Controller
Control Mode
Servovalve Product Information manual (part number 011-182-906) for product­specific information and maintenance procedures for the Series 252 Servovalve.

About the Servovalve

The heart of a servohydraulic system is the servovalve. It is the final control element in most MTS closed-loop systems. The servovalve responds to command signals generated by the software and processed by the controller and output through the valve driver module. The servovalve regulates the direction and flow of the hydraulic fluid entering the actuator from the hydraulic pressure ports. The direction that the spools move determines the direction of fluid flow to the actuator. A pressure difference is what causes the fluid to move.

Servovalve Functional

Control signal In a closed-loop hydraulic system, the Product Name uses the control signal from

Typical Closed-Loop System
an electronic control device (controller) to operate a valve that regulates the movement of a hydraulic actuator.
The control signal is created by comparing the program command signal (the desired actuator position) and the feedback signal from a transducer (the actual actuator position). Any difference between the two is called DC error, which is the command to the servovalve to supply hydraulic fluid to the actuator until the desired actuator position is achieved.
14
Introduction
Series 256 Servovalve Product Information
Page 15
MP-G046H-2
Return
Pressure
Pilot
Pressure
Third
Stage
Second
Stage
First
Stage
Fixed Orifice
Feedback
Spring
Lower
Polepiece
Flapper
Core
Third (Main) Stage Spool
LVDT
Transformer
Pilot
Return
Filter
Second (Pilot)
Stage Spool
Nozzle
Armature
Coil
Magnet
Upper Polepiece
Hydraulic
Actuator
Functional Diagram

Servovalve at rest The servovalve’s controlling element is the torque motor, which receives an

electrical input from the controller. A flapper is attached to the armature of the torque motor. The flapper moves from side to side as the armature moves in response to control signals from the controller. The flapper assembly is mechanically attached to the armature. There are two nozzles, one on each side of the flapper.
Because the nozzle-flapper valve is the first control point of hydraulic fluid, it is called the first stage. As long as there is no command for actuator motion, the flapper is centered between the two nozzles.
At the same time, pressurized hydraulic fluid entering the valve is applied equally to both sides of the spool, which does not move. This is the second stage.
Series 256 Servovalve Product Information Introduction
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Moving the spool A command from the controller causes the armature to rotate clockwise or

counterclockwise (depending on the polarity of the command). The command causes the flapper to block one of the nozzles which diverts hydraulic flow to that end of the spool. The spool moves and opens hydraulic pressure to one control port and the return line to the other control port. The control ports are connected to each end of the actuator.

Stopping the spool The feedback wire works like a spring. The spool moves until the feedback wire

torque equals the torque from the magnetic forces. This causes the flapper to move back toward the centered position. The spool stops at a position where the feedback wire spring torque equals the torque input current of the command. The spool position is proportional to the input command current.
Although the pressures are equal on both sides of the spool (so the spool is no longer moving), control flow from the servovalve keeps the actuator moving.
Stopping actuator
movement
When the actuator has moved the desired amount, the valve drive command decreases to zero. Hydraulic fluid flow to the actuator stops, and so does the actuator.

Series 256 Servovalve—Multiple Stages

The Series 256 Servovalve contains three stages. The first and second stages are formed by a Series 252 Servovalve. The first stage is a torque motor armature that controls a flapper valve in the second stage. This valve, in turn, controls the flow of hydraulic fluid (and therefore the movement of the spool) in the second stage. The position of the spool in the second stage, in turn, controls the flow of hydraulic fluid to the third stage. The third stage of the Series 256 Servovalve is the main stage, which contains a larger four-way spool. The position of the third stage spool is measured by a linear variable differential transformer (LVDT).
16
Introduction
Series 256 Servovalve Product Information
Page 17

Specifications

The following subsections list the general specifications, performance specifications, and performance characteristics of the Series 256 Servovalve.

Series 256 Servovalve General Specifications

The following table shows the specifications that are common to all Series 256 Servovalves.
ARAMETER SPECIFICATION
P
Temperature range -54°C to +135°C (-65°F to +275°F)
Specifications
Operating pressure*
Maximum
Minimum
Recommended hydraulic fluid
Pilot stage filtration
Main stage filtration
Seals
LVD T
Excitation
Impedance
Sensitivity
Pilot stage full flow current 25 mA (series)
Weight
256.04-01
256.05-01/02
256.09-01/02
256.18-01/02/05
256.25-01/02/05
256.40-01/02/05/10
The normal operating pressure is 21 MPa (3000 psi)
21 MPa (3000 psi)
1.3 MPa (100 psi)
Mobil DTE 25 or Shell Tellus 46
3 microns absolute
12 microns absolute
Buna-N Standard
.
20 V p-p at 10 kHz
200 ¾ minimum at 10 kHz
0.21 V/V per 2.54 mm (0.100 inch) stroke
50 mA (differential) 50 mA (parallel)
6.3 kg (14 lb)
7.3 kg (16 lb)
7.3 kg (16 lb)
9.3 kg (12 lb)
20.4 kg (43 lb)
45.4 kg (100 lb)
* Higher operating supply pressures up to 41 MPa (6000 psi) are available on request (contact MTS for
information. † Special seals are available on request on some 256 Models (contact MTS for information). ‡ For information on hydraulic fluid and hydraulic system care, see the Hydraulic Fluid Care Guide (MTS
part number 050-000-536).
Series 256 Servovalve Product Information Introduction
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Specifications

Static Performance Specifications

Values are typical for Series 256 Servovalves operated at the recommended hydraulic fluid filtration levels.
M
ODEL*RATED FLOW NOMINAL GAIN PRESSURE
G
AIN
PRESSURE C
OEFFICIENT
NULL FLOW
L/MIN GPM L/MIN/
%
STROKE
256.04 150 40 2.2 0.58 100 0.30 1.3x10-3 9.5 2.5
256.09 340 90 6.0 1.6 150 0.56 2.4x10-3 13.0 3.5
256.18 680 180 10.6 2.8 200 0.73 3.1x10-3 21.0 5.5
256.25 950 250 16.0 4.2 160 1.38 5.9x10-3 23.8 6.3
256.40 1500 400 29.0 7.7 250 1.38 6.9x10-3 20.4 7.5
GPM
% STROKE
(% SUPPLY/ %
STROKE)
3
CM
/
KGF-SEC
3
IN
/SEC/PSI)
L/
MIN GPM

Dynamic Performance Specifications

The dynamic data is derived from typical Model 256 Servovalve driven with a valve controller with “rate” compensation. A constant amplitude sine wave was used as the input signal to the valve controller. The amplitude was plus-or-minus the main stage, full-stroke, and LVDT voltage.
MODEL*RATED FLOW PILOT FLOW FULL FLOW
F
REQUENCY
90º PHASE
S
IGNAL
SPOOL STROKE RISE TIME (TR)
MILLISECONDS)
(
L/
MIN GPM L/MIN GPM HZ HZ 90% OPEN 10% OPEN
256.04A-01 150 40 3.8 1 80 130 4.8 3
256.09A-01
256.09A-02
256.18C-01
256.18C-02
256.18C-05
* Performance information is provided for the models listed. Contact MTS for performance information
for Models 256.18D and 256.xxB. † At 10% spool stroke. ‡ These are estimated values. All other values are typical.
Introduction
18
340 340
680 680 680
90 90
180 180 180
3.8
9.5
3.8
9.5 19
1
2.5
1
2.5 5
30 80
20 30 50
120 130
90 100 100
Series 256 Servovalve Product Information
9
4.6
12 7
5.5
3.5
4.3
3
2.2
1.8
Page 19
Specifications
MODEL*RATED FLOW PILOT FLOW FULL FLOW
F
REQUENCY
MIN GPM L/MIN GPM HZ HZ 90% OPEN 10% OPEN
L/
256.25A-01
256.25A-02
256.25A-05
256.40A-01
256.40A-02
256.40A-05
256.40A-10
950 950 950
1500 1500 1500 1500
250 250 250
400 400 400 400
3.8
9.5 19
3.8
9.5 19
3.8
1
2.5 5
1
2.5 5 10
10 18 25
4
9
12
15
90º PHASE
S
IGNAL
90 125 125
40
75 110 110
SPOOL STROKE RISE TIME (TR) (
MILLISECONDS)
15 <10 8
65
26 13 10
* Performance information is provided for the models listed. Contact MTS for performance information
for Models 256.18D and 256.xxB. † At 10% spool stroke. ‡ These are estimated values. All other values are typical.

Series 256 Servovalve Performance Characteristics

Note The servovalve flow at the higher frequencies depends on many system
characteristics that are unrelated to the Model 256 Servovalve (such as hydraulic fluid compressibility, supply and return line lengths, actuator characteristics, and specimen characteristics).
10 <10 4
20
8 4
3.5
The flow versus frequency performance curves shown in following figures indicate the relative performance of the 256 Servovalves at various frequencies. The curves are derived by driving the servovalve at the indicated frequency with a sine wave control signal and ± full current to the coil. A 21 MPa (3000 psi) pressure is supplied and there is a 7 MPa (1000 psi) pressure drop across the servovalve.
Servovalve performance at higher frequencies is a function of variables introduced by system components, actuator response, and specimen characteristics.
Series 256 Servovalve Product Information Introduction
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Specifications
Flow in Gallons Per Minute
256.40A
256.25A
256.09A
256.04A
-01
-01
-01
-01
-02
-02
-02
-05
-05
-10
Flow in Liters Per Minute
Frequency in Hz
1000
100
10
1
1
10 100 1000
3.8
38
380
3800
Series 256.xxA Flow vs. Frequency Servovalve Performance Curves
Note Performance is with 21 MPa (3000 psi) pressure supplied and 7 MPa
(1000 psi) pressure drop across the servovalve.
Introduction
20
Series 256 Servovalve Product Information
Page 21
Specifications
1000
100
10
1
110100
1000
3.8
38
380
3800
Flow in Gallons Per Minute
Flow in Liters Per Minute
Frequency in Hz
256.40B Available on Request
256.25B
256.09B
256.04B
-01
-02
-05
-05-02-01
-01
Flow in Liters Per Minute
Frequency in Hz
1000
100
10
1
110100
1000
3.8
38
380
3800
-05
256.18C
-01 -02
Flow in Gallons Per Minute
Series 256.xxB Flow vs. Frequency Performance Curves
Series 256 Servovalve Product Information Introduction
Series 256.18C Flow vs. Frequency Performance Curves
21
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Specifications
1000
100
10
1
1
10 100 10 00
3.8
38
380
3800
Flow in Liters Per Minute
Frequency in Hz
256.18D
-05
-01 -02
Flow in Gallons Per Minute
Main Stage
Spool Stroke
90%
Opening
10%
Opening
Time
t
r
t
r
Series 256.18D Flow vs. Frequency Performance Curves
Series 256 Servovalve - Rise Time
Introduction
22
Series 256 Servovalve Product Information
Page 23

Installation

CAUTION
WARNING

Contents How to Mount the Main Stage 23

This section describes how to install a Series 256 Servovalve. This procedure assumes that all electrical and hydraulic power to the system is off, and that the residual hydraulic pressure in the system is at zero.
How to Mount the Pilot Stage 24
How to Connect the Cables 26
Mixing different brands of hydraulic fluid can contaminate your system.
Contaminated hydraulic fluid can cause premature wear of the hydraulic components in your system.
Do not mix different brands of hydraulic fluid. MTS Systems Corporation recommends using Mobil DTE-25 or Shell Tellus 46 AW hydraulic fluid.
An active system has electrical or hydraulic power turned on.
Disturbing components of an active system can cause unexpected actuator motion and result in injury to personnel and/or damage to equipment.
Before installing or replacing a servovalve, ensure that all electrical and hydraulic power to the system is off, and residual hydraulic pressure in the system is at zero.

How to Mount the Main Stage

To mount the main stage and manifold to an actuator:
1. Remove any cover plates from the main stage and actuator manifold ports.
2. Ensure that all O-rings are in good condition.
3. Lubricate all O-rings with a light film of hydraulic fluid and place in their proper positions.
4. Mount the main stage body onto the actuator manifold and align the mounting holes.
5. Lubricate the main stage mounting screws with a light film of hydraulic fluid and tighten the mounting screws to:
Series 256 Servovalve Product Information Installation
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Page 24
For Models 256.04/.09/.18, tighten the screws to 47.45 N·m
Spool Stop
Pilot Stage Mounting
Drain End Cap
LVDT End Cap
LVDT Adjustment
LVDT Locknut
Main Stage Mounting
(35 lbf·ft)
For Models 256.25/.40, tighten the screws to 146 N·m (108 lbf·ft).
6. As you tighten the screws, those previously tightened will lose clamping force. Continue tightening until all screws are at the specified torque.
7. Mount the main stage manifold onto the main stage body and line up the mounting holes.
8. See the procedure for mounting the pilot stage in order to continue the installation procedure.

How to Mount the Pilot Stage

To mount the pilot stage (a Series 252 Servovalve) to a main stage manifold:
1. Ensure that system hydraulic pressure has been reduced to zero before proceeding. To do this, turn off the hydraulic power unit and exercise the actuator until it stops moving.
2. Remove the cover plate or existing pilot stage from the manifold.
3. Ensure that the O-rings between the pilot stage and main stage manifold are lubricated with a light film of hydraulic fluid and are correctly positioned.
Mounting Screw Locations
24
Installation
Series 256 Servovalve Product Information
Page 25
The alignment pin ensures that the servovalve assembly is properly
WARNING
Pilot Stage
Manifold
Main Stage
Hole for
Pilot Stage
Locating Pin
positioned over the hydraulic ports.
Failure to correctly align the locating pin and locating hole can result in injury to personnel, or damage to equipment.
Ensure that the locating pin on the bottom of the servovalve is correctly positioned within the locating hole of the actuator, manifold, or secondary servovalve.
4. Install the pilot stage onto the manifold, aligning the locating pin (as shown in the following figure).
5. Lubricate the mounting screws with a light film of hydraulic fluid. Tighten the mounting screws to 24.40 N·m (18 lbf·ft). As you tighten the screws, those previously tightened will lose clamping force. Continue tightening until all screws are at the specified torque.
6. Connect all hydraulic supply and return lines.
7. Connect control cables between the servovalve and the system controller, including a valve drive cable to the pilot stage and a inner loop feedback cable to the LVDT in the third stage.
8. Turn on system electrical power and hydraulic power.
9. Apply low hydraulic pressure to the servovalve so that the hydraulic fluid will fill the filter cavities gradually.
Series 256 Servovalve Product Information Installation
25
Page 26
10. Apply high pressure and check for leaks at the servovalve hydraulic
25 mA
Series
A
B
C D
Differential
50 mA/0 mA
0 mA/50 mA
A
B
C
D
Coils
Connector
A
B
C
D
80
W
80W
A
BC
D
backshell
7
9
11
12
13
Drain
+Valve Command 1
- Valve Command 1
+Valve Command 2
- Valve Command 2
MTS Controller
Single
Servovalve
A
B
C
D
Parallel
50 mA Total
A
B
C D
Output
-FB
-EX
A
B
D
C
Excitation
+FB
+EX
Note C and D leads may be reversed
for proper phasing.

How to Connect the Cables

The following figures show the pilot stage internal coils and connector wiring and the three cable wiring variations that can be used. (The main stage LVDT internal coils and connector wiring.)
connections and at the base of the servovalve.
Pilot Stage Coils and Connector
26
Installation
LVDT Coils and Connector
Series 256 Servovalve Product Information
Page 27
Page 28
m
MTS Systems Corporation
14000 Technology Drive Eden Prairie, Minnesota 55344-2290 USA Toll Free Phone: 800-328-2255
(within the U.S. or Canada)
Phone: 952-937-4000
(outside the U.S. or Canada) Fax: 952-937-4515 E-mail: info@mts.com Internet: www.mts.com
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