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Copyright information Trademark information © 2009-2011 MTS Systems Corporation. All rights reserved. MTS, SWIFT, TestWare, RPC, and Remote Parameter Control are registered trademarks of MTS Systems Corporation within the United States. These trademarks may be protected in other countries. Microsoft, Windows, Windows for Workgroups, Windows 95, and Windows NT are registered trademarks of Microsoft Corporation. Apple and Macintosh are registered trademarks of Apple Computer, Inc.
Contents Technical Support 5 How to Get Technical Support Before You Contact MTS 5 5 If You Contact MTS by Phone 7 Problem Submittal Form in MTS Manuals 8 Preface 9 Before You Begin Conventions 9 10 Documentation Conventions 10 Hardware Overview 13 Overview 14 Spinning Applications (Track or Road) 16 Non-Spinning Applications (Laboratory) Design Features Coordinate System Specifications Calibration 17 18 19 21 22 Transducer Interface 24 TI Front Panel 27 TI Rear Panel 28 Software
Transducer Interface Setup 41 USB Driver Installation Select a Zero Method 42 44 Calibration File Elements Upload the Calibration File Edit the Calibration File 45 47 48 Download the Calibration File 52 Installation 53 Transducer Interface Electronics Installation SWIFT Sensor Setup for Data Collection Quality of the Zero Procedure Verification Data Collection 61 Road Simulator 63 Zero the Transducer Interface 54 56 60 64 Alternate zero procedures 67 Maintenance 71 Transducer Interface 71
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. 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. Technical support methods www.mts.
Know information from prior technical assistance Identify the problem Know relevant computer information Know relevant software information 6 Technical Support 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 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 softwar
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.
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.
Preface Before You Begin Safety first! Other MTS manuals Before you use your MTS product or system, read and understand the Safety manual and any other safety information provided with your system. Improper installation, operation, or maintenance can result in hazardous conditions that can cause severe personal injury or death, or damage to your equipment and specimen. Again, read and understand the safety information provided with your system before you continue.
Conventions Conventions Documentation Conventions The following paragraphs describe some of the conventions that are used in your MTS manuals. Hazard conventions Hazard notices may be embedded in this manual. These notices contain safety information that is specific to the activity to be performed. Hazard notices immediately precede the step or procedure that may lead to an associated hazard. Read all hazard notices carefully and follow all directions and recommendations.
Conventions Hypertext links SWIFT® Mini TI 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.
Conventions 12 Preface SWIFT® Mini TI
Hardware Overview Contents Overview 14 Spinning Applications (Track or Road) Non-Spinning Applications (Laboratory) Design Features Calibration SWIFT® Mini TI 19 21 22 Transducer Interface WEEE 17 18 Coordinate System Specifications 16 TI Front Panel 27 TI Rear Panel 28 24 The Waste Electrical and Electronic Equipment (WEEE) symbol ( ) means that the controller and its electronic parts must not be disposed of as unsorted municipal waste.
Overview Overview The MTS Spinning Wheel Integrated Force Transducer (SWIFT®) sensor is a light-weight, easy-to-use transducer that enables you to conduct faster, less expensive data acquisition and road simulation testing. The transducer is designed for use on the test track and public roads, as well as in the test laboratory. It attaches to the test vehicle or an MTS Series 329 Road Simulator using an adapter and a modified wheel rim.
Overview CAUTION Do not disassemble the SWIFT sensor, Transducer Interface (TI) electronics, and accessory components. The SWIFT sensor, TI electronics, and accessory components are not intended to be disassembled, other than as outlined in “Troubleshooting”. Disassembling or tampering with these components may result in damage to the sensor, loss of watertight seal, and voiding of the warranty.
Spinning Applications (Track or Road) Spinning Applications (Track or Road) The SWIFT sensor can be used for road load data acquisition (RLDA) applications: • Durability • Noise, Vibration and Harshness (NVH) • Ride and Handling • Tire Performance The transducer is durable enough to withstand harsh road testing and data acquisition environments.
Non-Spinning Applications (Laboratory) Non-Spinning Applications (Laboratory) The SWIFT sensor can be fully integrated into the simulation process, since it is an optimal feedback transducer for use with MTS Remote Parameter Control (RPC) software. The transducer takes data at points where fixturing inputs are located rather than at traditional instrumentation points along the vehicle’s suspension.
Non-Spinning Applications (Laboratory) Design Features Flexure isolation The SWIFT sensor has a very stiff outer ring and flexured beam isolation which render it relatively insensitive to stiffness variations in matings with rims and road simulator fixtures. Flexure isolation minimizes thermal expansion stresses. With flexure isolation, if the inner hub experiences thermal expansion the beams are allowed to expand out, resulting in lower compressive stress on the beams.
Coordinate System Coordinate System In the transducer, independent strain gage bridges measure forces and moments about three orthogonal axes. The signals are amplified to improve the signal-tonoise ratio. An encoder signal measures angular position, which is used to convert raw force and moment data from the rotating transducer to a vehiclebased coordinate system. The force, moment, and encoder information are sent to the transducer interface (TI).
Coordinate System The coordinate system shown below was originally loaded into the TI settings by MTS. It uses the right-hand rule. +Fz +Mz +Fx +Mx Hub Adapter Mounting Side +My +Fy Rim Flange Mounting Side Forces Acting on Rim-side of Transducer S10-09 By default, the SWIFT coordinate system is transducer-based, with the origin located at the center of the transducer. Positive loads are defined as applied to the outer ring of the transducer. • Vertical force (Fz) is positive up.
Specifications Specifications Transducer Interface Parameter Specification Physical Height 28 mm (1.100 in) Width 213 mm (8.375 in) Depth 171 mm (6.750 in.)* Weight 0.
Calibration Calibration Each transducer is calibrated by MTS before shipment. The transducer and TI may be returned to MTS for repair and recalibration as required. Calibration is performed at MTS on a special fixture that is capable of applying multiple loads to the transducer. During calibration, raw signals are measured. The calibration gains and cross talk compensation values are computed from this raw data. These gains are recorded in a calibration file.
Calibration When you press the Shunt button, the associated Shunt indicators toggle while the shunt is in progress. As the TI automatically switches through the series of bridges, it verifies that the outputs are within the accepted tolerance range. If all bridge shunt values fall within the tolerance range, the Shunt indicators on the front panel will go off (after several seconds). If any bridge fails the shunt test, the red, fail indicator lights, indicating that the shunt calibration has failed.
Transducer Interface Transducer Interface The TI performs cross talk compensation, transforms the loads from a rotating to a non-rotating coordinate system, and produces an analog output signal suitable for most data recorders. or Angular Velocity signal (+/- 10 V) Cross talk compensation Signal conditioning Cross talk occurs when a force is applied to one axis, but a non-real force is measured on another axis. The SWIFT sensor design has very low inherent cross talk.
Transducer Interface Coordinate System Offset Matrix The TI conditions the transducer signals, producing seven analog output signals proportional to the following values: Analog signals • Longitudinal force (Fx) • Lateral force (Fy) • Vertical force (Fz) • Overturning moment (Mx) • Driving/Braking moment (My) • Steering moment (Mz) • Angle (θ) or Angular Velocity (ω) The force, moment, and angular velocity signals are output from the TI in the form of ±10 V1 full scale analog signals.
Transducer Interface The angle output for a tire rotating at constant velocity can be represented by the following illustration: Angle Output 5V 1 rev = 360° 0 360° 0° q 360° S20-10 Although you may not routinely use it, the angle output information is available for tasks such as tire uniformity testing and troubleshooting. If using the sawtooth angle output for analysis, care should be taken when setting the data acquisition to avoid filter-induced ringing or attenuation of the sawtooth output.
Transducer Interface TI Front Panel J4 I/O Connector J5 USB Connector Zero button and Indicators Shunt button and Indicators Power button and Indicator and Fail Indicator Transducer Interface Front Panel Power button and Indicator The power button turns power on and off. Pressing and holding the button turns on power and initializes the TI. During initialization, all indicators turn on momentarily.
Transducer Interface TI Rear Panel J1 Power Connector J2 Output Connector J3 Transducer Connector Transducer Interface Rear Panel J1 Power connector Connect a power cable from the external power source. J2 Output connector The J2 Output connector provides the conditioned sensor outputs that can be connected to a data acquisition or test control system. J3 Transducer connector Connect the data cable from the transducer slip ring to the Transducer Connector.
Software Utilities Contents Introduction 30 TI2STATUS - Transducer Interface Status 31 TI2XFER - Transducer Interface Transfer 33 TI2SHUNT - Transducer Interface Shunt 35 Error Messages SWIFT® Mini TI 38 Software Utilities 29
Introduction Introduction The SWIFT utility programs in this distribution are for Win32 Operating Systems (Windows 2000 and XP). They are designed to be run from the Command Prompt or MSDOS Shell. However, it is possible to create a shortcut to run the programs. If launched from a shortcut the application window may close immediately when the application terminates making it impossible to see any error messages.
TI2STATUS - Transducer Interface Status TI2STATUS - Transducer Interface Status This program gets status information from the SWIFT Transducer Interface (TI) when the TI has encountered a problem and the red failed indicator is lit. You can use this program to easily interpret the error. For certain errors this program may provide additional information. Syntax ti2status The following is an example of the ti2status command report: Example C:\bin>ti2status SWIFT Mini TI status (Version 1.
TI2STATUS - Transducer Interface Status Zero: 32 Indicates whether the transducer zeroing was successful or not (see, “Error Messages,” on page 38 for a list of the possible errors). F## Shunt: Indicates the status of shunt test for each bridge (see, “Error Messages,” on page 38 for a list of the possible errors). Calibration data is: Indicates that the TI calibration data passed a data consistency check. The TI is calibrated by itself, before system calibration is performed.
TI2XFER - Transducer Interface Transfer TI2XFER - Transducer Interface Transfer This program is used to read the current settings in the TI and save them to the computer (upload) or write the values from a calibration file on the computer to a TI (download). Syntax ti2xfer The following is an example of the ti2xfer command: Example C:\bin>ti2xfer SWIFT Mini TI transfer (Version 1.0) Upload and download settings 0...Exit 1...Upload settings from TI box 2...
TI2XFER - Transducer Interface Transfer CAUTION Make important files (such as those containing calibration data) read-only after uploading. If not protected, important data may get overwritten. Make important files read-only. Make backups of important data. CAUTION Check force and moment output signals after downloading new settings. Downloading new settings may affect Transducer Interface outputs.
TI2SHUNT - Transducer Interface Shunt TI2SHUNT - Transducer Interface Shunt This program is a utility with various functions related to shunts. The SWIFT system includes the ability to connect a shunt resistor across each of the resistive bridges in the transducer. This shunt function can be used as a simple verification that the SWIFT system is working normally. Shunt verification activates the shunts and compares the results to those recorded during calibration.
TI2SHUNT - Transducer Interface Shunt Option 2 Use this to set the shunt tolerance. When selected, the following is displayed: Enter choice: 2 The current shunt tolerance is 2% Enter new shunt tolerance in percent? Option 3 Use this option to apply a shunt to each bridge individually, read the output of the bridge, compare the result with the value stored in the Transducer Interface and display the difference each bridge. See the table on the next page. The shaded fields are the bridge being shunted.
TI2SHUNT - Transducer Interface Shunt Option 5 A valid shunt calibration should be performed prior to executing this command. This option allows an easy means of setting the Shunt Calibration Reference values after calibration. This is normally done as part of calibration and should not be done during normal use. After this option has executed, uploads will contain the new shunt reference values. Note SWIFT® Mini TI This menu choice should only be used by qualified service personnel.
Error Messages Error Messages When a SWIFT utility encounters an error, the red failed indicator on the TI front panel lights. Run the TI2STATUS program to identify the cause of the error.
Error Messages • Zero Good – no problems detected Bad Angle Offset – The change in angle was not 90°, ±2°. Direction Change – The direction of 90° increments reversed. • Shunt Good – no problems were detected. Reference Bad – The shunt reference is out of range. Shunted Bad – A shunt value does not match the shunt reference. Unshunted Bad – While shunting one bridge another bridge output unexpectedly changed. • Calibration Data is: Good – No problems were detected.
Error Messages 40 Software Utilities SWIFT® Mini TI
Transducer Interface Setup Overview Two different software configurations are used by the TI, depending on whether you will be using the SWIFT sensor on the test track (typical for spinning application) or in the laboratory (typical for non-spinning or fixed application). Angular transformation is required on the test track only.
USB Driver Installation USB Driver Installation Two USB 2.0 drivers must be installed to recognize the Transducer Interface. Perform the following procedure to install these drivers on a laptop or desktop computer that does not already have these drivers installed. Important Do not allow Windows to search for or choose the drivers for you. Always direct Windows to the path containing the Mini TI USB drivers. 1. Copy the Mini TI USB drivers from the Utilities CD provided to your hard drive. 2.
USB Driver Installation 4. On the next window, select the Install from a list or specific location (Advanced) radio button. 5. If you copied the driver files from the CD to your hard drive, use the browser to direct the wizard to the location where you copied the files as shown in the next figure. 6. Click Next to install the loader for the MTS SWIFT TI Interface 7. When the installation is complete, click Finish on the window that displays. 8. Another Found New Hardware Wizard will display.
Select a Zero Method Select a Zero Method Before you install a transducer and zero it, you must configure the transducer interface (TI) for the appropriate operating mode. Equipment required Modes You will need: • A laptop computer (at test track) or desktop PC with Window 2000 or XP operating system. • A USB 2.0 communication cable with type A to type B connectors. • SWIFT Transducer Interface Utilities diskette. • Some experience with DOS commands and text editors.
Select a Zero Method Calibration File Elements The following figure shows some elements of the calibration file: Typical Calibration File SWIFT® Mini TI Transducer Interface Setup 45
Select a Zero Method Items you may edit 46 • OutputPolarities—defines the polarities of the six outputs. Change these only if your application requires different polarities from those identified on the transducer label. • AngleMode—selects the mode used for determining the encoder sine and cosine. • AngleFixed—used for non-spinning applications. • AngleOffset— used for spinning applications. Normally you do not need to change this value. • EncoderSize—defines the size of the encoder.
Upload the Calibration File Upload the Calibration File A unique calibration file was loaded into the TI memory by MTS before the transducer and transducer interface were shipped. Use the program TI2XFER to retrieve the calibration file. 1. Connect a USB cable from the laptop computer or PC to the TI. Note Ensure the proper USB 2.0 drivers are installed on the laptop or PC. Refer to, “USB Driver Installation,” on page 42, as necessary 2.
Edit the Calibration File Edit the Calibration File CAUTION The calibration file contains offset values for all of the bridge outputs. Changing any values other than those listed in the following procedure will cause your calibration file to be incorrect. Take care not to change any values except those listed in the following procedure. If your calibration file is incorrectly changed, reload the original file from the diskette provided by MTS. 1. Open the calibration file using a text editor.
Edit the Calibration File 2. If necessary, edit the value for Polarity (see the table below). The polarities that match the coordinate icon on the transducer are: Fx=0 Fy=0 Fz=0 Mx=1 My=0 Mz=1 Example Output Polarities Output Polarity Value Description OutputPolarities = 40 Standard Setting from +Fx = fore MTS. Matches the axis orientation on the front +Fy = out from car, left cover of the SWIFT.
Edit the Calibration File 3. If desired, set up the coordinate system offset. In the following figure, Fx, Fy, Fz is the original default coordinate system location. F’x, F’y, F’z is the output coordinate system with a y-axis negative offset. The offset is entered in the calibration file: // Coordinate system offset in mm. // A non-zero value will shift the location of the output // coordinate system along the transducer's y-axis.
Edit the Calibration File B. The AngleOffset value is used when you are operating in encoder mode (spinning applications). This value is summed with the encoder output count. At the end of the process the value in the TI internal memory and used when the angle mode is set to 0 (encoder). Negative angles are converted to their positive equivalent so that the readback value range is 0–360°. The AngleOffset value is calculated by the TI during the zero process.
Download the Calibration File Download the Calibration File Use the program TI2XFER to download the modified calibration file to the TI. 1. Insert the CD or diskette into the laptop computer or PC. 2. Run the program TI2XFER. 3. Enter 2 at the prompt to download the calibration file. 4. Enter the name of the file you wish to download. 5. TI2XFER will prompt you when the file has successfully downloaded. 6. Enter 0 at the prompt to exit the program. SWIFT Mini TI transfer (Version 1.
Installation The SWIFT sensor can be installed on a vehicle at the test track or on an MTS Series 329 Road Simulator in the test laboratory.
Transducer Interface Electronics Installation Transducer Interface Electronics Installation The Transducer Interface (TI) electronics should be securely fastened to the vehicle. The TI box is designed to withstand the accelerations associated with the body of a vehicle during rugged durability and typical data acquisition testing. The TI box can be located anywhere on the vehicle that is convenient.
Transducer Interface Electronics Installation The data recorder should also be connected to the battery negative terminal. (See the following figures.) Data Recorder 12 Vdc Transducer Interface S10-25 Suggested Grounding for a single TI Box Data Recorder 12 Vdc Transducer Interface Transducer Interface Transducer Interface Transducer Interface S10-26 Suggested Grounding for a Multiple TI Boxes 3. Secure the TI box so that it will not move during data collection.
SWIFT Sensor Setup for Data Collection SWIFT Sensor Setup for Data Collection To ensure accurate data collection, complete this setup procedure daily before you begin testing. The accuracy of the data that you collect depends on the ability of the SWIFT electronics to “zero out” the forces and angles present in an initial, unloaded state. During the Zero process, the TI box reads the transducer bridge values and compensates for any offsets so that the bridge output is 0 at 0.0 V.
SWIFT Sensor Setup for Data Collection 1. Raise the vehicle with a lift or with jacks until each wheel is off the road surface. The vehicle should be raised in a level manner, such that the orientation of the anti-rotate bar is the same in the lifted position as it was in the grounded position. Note Perform the remainder of this procedure completely for one transducer/ TI box combination at a time. Important Performing the following step is critical after power-up. 2.
SWIFT Sensor Setup for Data Collection 5. Install the inclinometer/level bracket assembly on the transducer by inserting the dowel pins in the level bracket into the pin pilot holes provided in the transducer, as shown in the next figure. The orientation of the inclinometer/level bracket assembly is determined by the orientation of the anti-rotate bracket. 6. Adjust the tire rotation, as necessary, until the inclinometer reads 0.0°, ±0.1° (or 90.0°, ±0.
SWIFT Sensor Setup for Data Collection 9. Repeat Step 5 through 8 three more times. Before Step 5 of each iteration, rotate the tire 90°. Always rotate the tire in the same direction. (That is, if the first rotation was clockwise, the succeeding rotations should also be clockwise.) Note SWIFT® Mini TI If the red Fail indicator lights a problem was detected during the zero process. Try repeating the procedure. Use TI2STATUS for a more detailed explanation of the problem.
Quality of the Zero Procedure Verification Quality of the Zero Procedure Verification Perform the following consistency checks for each SWIFT sensor while the vehicle (or corner) is elevated. 1. Does Fz measure the approximate weight of the tire/rim assembly? 2. Is Fx small (less than 0.2% of the rated load)? 3. What is the variance in Fz (modulation) when the tire is slowly rotated? The typical value should be <500 N. 4. Perform a shunt calibration on each transducer.
Data Collection Data Collection After you zero the TI, you are ready to collect data. Note If you turn off power to the TI boxes, the zero values will remain valid, but after power is restored, the wheels should be rotated at least one full revolution so that the encoder can detect the index pulse to properly convert the rotating coordinates to stationary coordinates. The transducer outputs will not be correct until this happens. 1. Remove the vehicle from the lift or jacks. 2.
Data Collection CAUTION Tall grass and brush can damage the sensor components. Driving through grass and brush that is higher than the bottom edge of the transducer can damage the cable and tear off the slip ring. Avoid driving in any areas with tall grass and brush. WARNING Driving a vehicle with SWIFT sensors mounted on it will change the handling characteristics of the vehicle. Driving a vehicle configured in this way on public roads can pose unexpected dangers to pedestrians and other vehicle traffic.
Road Simulator Road Simulator There are two methods of using a SWIFT on a road simulator. The traditional “non-spinning” or “fixed” mode relies on the orientation of the SWIFT during road simulator use maintaining the same orientation relative to the anti-rotate position used during road testing. The SWIFT outputs are given in set coordinates relative to the SWIFT sensor orientation, and no angular transformation is applied to the SWIFT outputs.
Zero the Transducer Interface Zero the Transducer Interface For fixed mode For the non-spinning (fixed) zero method, use the TI2Xfer to download the fixed calibration file (serialnumberf.ca)l to the appropriate TI box. The angle mode in the calibration file should be: AngleMode=1 Rotate the transducer such that the orientation labeling is consistent with the reference orientation. In most cases, this means rotating the transducer so the labels are upright.
Zero the Transducer Interface 2. Rotate the adapter plate, as necessary, until the Fz on the axes icon (see the next figure) printed on the transducer label is pointing up. Axes Icon S 3. If not already assembled, attach the inclinometer to the level bracket using the two 6-32 UNC fasteners provided. Apply Locktite 222 to the threads on the fasteners. Torque each fastener to 2 N•m (18 lbf•in). 4.
Zero the Transducer Interface Adapter Plate Level Bracket Digital Inclinometer –in this position should read 90°, ±0.1° Axes Icon Setup for Horizontal Anti-rotate Bracket Configuration 5. Adjust the adapter plate, as necessary, until the inclinometer reads 0.0°, ±0.1° (or 90.0°, ±0.1° depending on the orientation of the inclinometer) as shown in the figure above. 6. Push the Zero button on the front of the TI box. The Zero indicators will toggle during the zero process.
Zero the Transducer Interface Alternate zero procedures Firmware changes were made to the Mini TI to make it compatible with older models. These firmware changes provide two additional zeroing procedures. For the spinning zero method, use the TI2Xfer to download the spinning calibration file (serialnumbers.cal) to the appropriate TI box. The angle mode in the calibration file should be: AngleMode=0 Now one physically has to specify the zero algorithm.
Zero the Transducer Interface 4. Rotate the tire in either direction until the lower Zero indicator turns off and the upper indicator turns on (approximately 1.25 revolutions). The bridge zeros will be computed using the average value of the bridges over one full revolution. The angle offset will be calculated using a sine curve fit to the raw bridge data. Once the computation is complete, both Zero indicators will turn off.
Zero the Transducer Interface 7. Push the Zero button on the front of the TI box. The upper Zero indicator will turn on temporarily while the encoder angle is recorded. When the lower Zero indicator turns on, proceed to the next step. 8. Rotate the tire in either direction until the lower Zero indicator turns off and the upper indicator turns on (approximately 1.25 revolutions). The bridge zeros will be computed using the average value of the bridges over one full revolution.
Zero the Transducer Interface 70 Installation SWIFT® Mini TI
Maintenance Scheduled maintenance is a set of routine procedures that allow you to extend the operating life of the transducer interface electronics. The information provided in this chapter is a recommendation only. The actual time intervals will depend on the operating conditions at your facility. Transducer Interface The electronics for your transducer have no internal parts that can be serviced by the user. The case is sealed against moisture.
Maintenance SWIFT® Mini TI
Troubleshooting This chapter covers basic set-up related troubleshooting tips. Please read this section to investigate problems that you observe. In many cases, these problems will be setup related and can be corrected as described in this section. Important In the event that these troubleshooting tips indicate that there is a component failure, or the correction tips do not correct the problem, contact MTS.
Troubleshooting Guide (part 1 of 11) Symptom Possible Causes Transducer Interface (TI) does not power up (green power indicator is not lit). FAIL indicator. Solution If any of the following conditions exist, the Power indicator next to the Power button will not turn on (green) when you press the button. The TI power supply cable is not connected. Check that the cable is securely connected to the TI box. At the back of the TI box, the J1 Power must be connected to a power supply or battery.
Troubleshooting Guide (part 2 of 11) Symptom Some or all transducer output signals read 0 volts at the TI output even when a load is present. SWIFT® Mini TI Possible Causes Solution The TI is not turned on. Check that TI is turned on and the green power indicator is lit. The transducer signal cable is not connected. Check that the cable is connected between the TI box and the slip ring (or connector housing for a road simulator). Output cables are not connected.
Troubleshooting Guide (part 3 of 11) Symptom Zero Offset: One or more Signal Outputs appear to have an offset after the TI electronics have been zeroed. Possible Causes Solution The transducer was zeroed with load applied (or a different load than the intended tare weight for non-spinning applications only). Rezero the TI, being careful not to touch or load the transducer during the zero procedure. Considerable temperature changes have occurred.
Troubleshooting Guide (part 4 of 11) Symptom Possible Causes Solution The AngleOffset value is incorrect in the calibration file. If an incorrect AngleOffset value is set in the TI calibration file, an axis which should have no load may show some load from another vehicle coordinate axis based on the incorrect reference orientation. Verify that the correct AngleOffset is set for your specific application (refer to, “Edit the Calibration File,” on page 48).
Troubleshooting Guide (part 5 of 11) Symptom Possible Causes The data acquisition scales are set incorrectly. Solution Check that the data acquisition scales are set correctly. The full scale calibration range is shown on the Calibration Report, with 10 V = Full Scale (unless you requested custom calibration output before calibration at MTS).
Troubleshooting Guide (part 6 of 11) Symptom Possible Causes Failed indicator lights after Shunt Calibration The signal cable is not connected to the transducer or it is damaged or the transducer is damaged. Solution Perform TI2STATUS. Check that the proper calibration file was downloaded (the serial number in the report matches the transducer serial number. Check the error messages in the report.
Troubleshooting Guide (part 7 of 11) Symptom Possible Causes Solution The shunt reference values were changed. Use the TI2XFER program to upload the current calibration file. Check the file to verify that the variables ShuntDeltaRef are the same as shown on the original calibration file provided by MTS. The eight ShuntDeltaMeas values should read approximately 0.85 V. The shunt tolerance is not set correctly. Use the TI2XFER program to upload the current calibration file.
Troubleshooting Guide (part 8 of 11) Symptom Errors reported when TI2STATUS is run. Possible Causes Shunt errors that TI2STATUS could report. Zero errors that TI2STATUS could report. SWIFT® Mini TI Solution • Reference Bad – a downloaded shunt reference is zero. This is a calibration settings problem. • Shunted Bad – A bridge being shunted deviated from the shunt reference by more than the limit.
Troubleshooting Guide (part 9 of 11) Symptom Shunt Calibration as Recorded by External Data Acquisition is incorrect or inconsistent. (The internal shunt check in the TI electronics verifies each of the eight individual bridges, but it is the six bridge 10 V output that you can record if desired.) The output signal polarity is incorrect Possible Causes Solution The gains have been changed in the calibration file.
Troubleshooting Guide (part 10 of 11) Symptom Possible Causes Solution A one-time-per-revolution of tire signal appears while the vehicle is driving straight on a flat surface. Mean level of the FZ output is roughly equal to the weight of the vehicle on that corner. Temperature Effects: The SWIFT transducer is temperature compensated to reduce temperature induced errors, but any significant changes in temperature will induce zero shifts.
Troubleshooting Guide (part 11 of 11) Symptom Possible Causes Solution Spinning Application: Vehicle Coordinate System Outputs have unusual or incorrect waveform shapes to them. (Continued) A four-time-per-revolution of tire signal is showing up when the vehicle is driving straight on a flat surface. Wheel force transducers often have a modulation error with a cyclic frequency equal to the number of beams on the transducer.
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.
