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MTS Systems Temposonics II LDT Installation And Instruction Manual

Linear displacement transducer
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Sensors Division
Te m p o s o n i c s
I I
®
Linear Displacement Transducer
Installation and Instruction Manual for
DIGITAL SYSTEMS
P/N 550033 Rev. F
Part No. 550033 Rev. E
1

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  • Page 1 Sensors Division Te m p o s o n i c s ® Linear Displacement Transducer Installation and Instruction Manual for DIGITAL SYSTEMS P/N 550033 Rev. F Part No. 550033 Rev. E...
  • Page 2 MTS PHONE NUMBERS Application questions: 800-633-7609 Service: 800-248-0532 Fax: 919-677-0200 SHIPPING ADDRESS MTS Systems Corporation Sensors Division 3001 Sheldon Drive Cary, North Carolina 27513 HOURS Monday - Thursday 7:30 a.m. to 6:30 p.m. EST/EDT Friday 7:30 a.m. to 5:00 p.m. EST/EDT...

  • Page 3: Table Of Contents

    TABLE OF CONTENTS Section Page INTRODUCTION Theory of Operation/Magnetostriction Temposonics II LDT Specifications Specifications for Temposonics II LDTs over 180 inches TEMPOSONICS II LDT INSTALLATION Types of Transducer Supports 2.1.1 Loop Supports 2.1.2 Channel Supports 2.1.3 Guide Pipe Supports Open Magnets...

  • Page 4: Introduction

    1. Introduction to the Temposonics II Linear Displacement Transducer (LDT) The Temposonics II LDT precisely senses the position of an external magnet to measure displacement with a high degree of accuracy and resolution. Using the principle of magnetostriction (see Section 1.1, below), the Temposonics II LDT measures the time interval between the initiation of an interrogation pulse and the detection of a return pulse.

  • Page 5: Temposonics Ii Ldt Specifications

    1.2 Temposonics II LDT Specifications Parameter Specifications Input Voltage: ± 12 to ± 15 Vdc Current Draw: Transducer Only: ± 15 Vdc at 100 mA maximum, 25 mA minimum (current draw varies with magnet position, maximum draw occurs when magnet is at 2 in.

  • Page 6: Specifications For Temposonics Ii Ldts Over 180 Inches

    1.3 Specifications for Temposonics II LDTs over 180 Inches Below is a list of specifications that pertain to Temposonics II transducers with active stroke lengths of 180 inches (4572 mm) to 300 inches (7620 mm). Special versions of the Analog Output Modules (AOM) and Digital Interface Boxes (DIB) are required to interface with transducers over 180 inches in length.

  • Page 7: Temposonics Ii Ldt Installation

    2. Temposonics II LDT Installation Before beginning installation, be sure you know the following dimensions (as illustrated in Figures 2-1 to 2-3a-c.): • Null Space • Stroke • Dead Zone Flange to Tip Standard Null Dead Zone (2.0 in., 50 mm) 2.50 in.
  • Page 8 1. Use the 3/4 inch (19 mm), 16 UNF thread of the transducer to mount it at the selected location. Leave room to access the hex head. If a pressure or moisture seal is required, install an O-ring (type MS 28778-8 is recom- mended) in the special groove.

  • Page 9: Types Of Transducer Supports

    NOTE: Clearance between the magnet and the transducer rod is not critical. However, contact between the components will cause wear over time. The installation of supports or readjustment of the supports is recommended if the magnet contacts the transducer rod. 4.

  • Page 10: Channel Supports

    2.1.2 Channel Supports Channel supports, being typically straight, are normally used with rigid transducers. A channel support consists of a straight channel with loop supports mounted at intervals. The loop supports are required to keep the transducer within the channel. Figure 2-5 shows a channel support. Channel supports are available from various manufacturers or may be fabricated.

  • Page 11: Open Magnets

    2.2 Open Magnets When using an open magnet, make sure the rod is positioned at all times within the “active” zone of the magnet. The transducer cannot operate properly unless the entire stroke of the transducer rod is located within this zone. The active zone, as shown in Figure 2-7, lies within the inside diameter of the magnet. Active Zone Figure 2-7...
  • Page 12 Figure 2-8 shows a typical cylinder installation. Review the following before attempting this type of instal- lation. • Use a non-ferrous (plastic, brass, Teflon®, etc.) spacer [1] to provide 1/8 inch (32 mm) minimum space between the magnet and the piston. •...
  • Page 13 1.180 in. Recommended Minimum Spotface Diameter See Note 1 0.004 A 0.008 A ø0.813 in. ø0.866 in. ±0.002 in. Minimum See Note 2 0.008 in. 0.004 in. 0.094 in. Max. 0.125 µin. 0.106 in. ±0.008 in. 1.100 in. R0.015 in. 1.250 in.

  • Page 14: Installing Magnets

    2.5 Installing Magnets Figure 2-10 below shows the standard magnet types and dimensions. The circular magnet with an outside diameter of 1.29 inches and 0.53 inch inside diameter (Part No. 201542) is the most common and is suit- able for most applications. Larger magnets, with an outside diameter of 2.5 inches are typically only used with Temposonics transducers that exceed 180 inches in stroke length.

  • Page 15: Grounding

    3. Grounding Flange Ground connection between bracket (electrically isolated from threads) and outer cover made by threads Connector (10 pins) Bracket (internal to head enclosure) Transducer Rod (3/8 in. stainless steel) Machine Ground Head Assembly Grounding Diagram Cable Shield (no connection) Driver/Amplifier Module Signals Return(s)

  • Page 16: Digital System Configurations

    The typical digital system configurations are shown in Figures 4-1, 4-2, and 4-3. Figure 4-1 is a “full” digital sys- tem. A full digital system includes a Temposonics II LDT with an integrated Digital Personality Module (DPM) and a Digital Counter Card and supplies either a Binary Coded Decimal (BCD) or Natural Binary output. When ordered as a scaled system, the components are matched and factory calibrated and will provide an exact, discrete resolution.

  • Page 17: Specifications Of Digital System Components

    Power Supply Requirements • ±12 to ±15Vdc @ 140mA (bipolar) Belden YR8105 or equivalent (5 pair) User's Control System Pulse Width Output Digital Personality Module Figure 4-3 Half Digital System Configuration with an LDT and a DPM 4.1 Specifications/Digital System Components (Temposonics II with TCS Counter Card) Parameter Specification Digital Counter Card...

  • Page 18: Digital Personality Module

    4.2 Digital Personality Module (DPM) The Digital Personality Module (DPM) replaces the functions provided by the digital interface box. The DPM, which is roughly the size of a US postage stamp, is installed directly into the transducer head and provides electronics for pulse shaping, digital recirculations, auto interrogation, and cable interfacing. NOTE: Call MTS Sensors Division when replac- ing a Digital Interface Box with an inte-...

  • Page 19: Asynchronous (Internal Interrogating) Mode

    Update Time User Defined External InterrogationTiming + Gate DPM Output - Gate Figure 4-5 Timing for Two Circulations 4.2.2 Asynchronous (Internal Interrogating) Mode In asynchronous operation the transducer interrogates itself. The DPM uses a fixed interrogation frequency. Switches SW1 and SW2, located on the DPM board, are set to the hexadecimal value of the desired number of recirculations.

  • Page 20: Rs422 Personality Module

    Figure 4-6 RS422 Personality Module (RPM) 4.3 RS422 Personality Module (RPM) The RS422 Personality Module (RPM) is an alternate integrated circuit module. The RPM is also the size of a US postage stamp and is installed directly into the transducer head to provide the circuitry required to produce an RS422 start/stop output.

  • Page 21: Digital Counter Card

    4.4 Digital Counter Card The digital counter card measures the on-time of the DPM pulse duration signal. This is accomplished by using a crystal oscillator with frequency selected to provide the desired resolution (counts per inch). A 27- 28 MHz crystal is typically used. The leading edge of the pulse duration signal enables the counter registers, and the trailing edge triggers a “latch pulse”...

  • Page 22: Scaling

    4.4.1 Scaling In most cases, the system supplied is a scaled system. Scaling refers to the selection of system component variables so that the natural binary output represents a discrete number of inches per count, such as 0.002 inch, 0.001 inch, or 0.0005 inch per count. For BCD outputs, scaling means that the output reads directly in inches (mm, etc.), and need not be corrected mathematically.

  • Page 23: Digital System Adjustments

    5. Digital System Adjustments The Temposonics measurement systems do not require service or re-calibration under normal use. The systems’ sensing elements are non-contacting and the components are solid state. Performance will not degrade, or drift over time. Digital systems have a zero-adjustment only. They do not have field adjustments for scale purposes. The output is factory set during final calibration by selection of the counter card crystal frequency and zero-preset.

  • Page 24: Electronic Connections

    6. Electronic Connections 6.1 General Figure 6-1 (below) illustrates the interconnections of a typical digital system comprised of a Temposonics II transducer, an integrated Digital Personality Module (DPM) and a Digital Counter Card. Temposonics II Function Pin Numbers +12 to +15 Vdc +12 to +15Vdc Power Supply •...

  • Page 25: Transducer Connections

    To ensure system performance to published specifications, wiring procedures and system configuration guidelines must be carefully followed. NOTE: The following recommendations are sup- plied for “full digital” systems, which include a Temposonics Digital Counter Card. For systems which use a digital counting device in the receiver computer, the counter card is not supplied.
  • Page 26 5. For retrofitting DIBs with strike lengths less than 12 inches (- interrogation) 6. IMPORTANT: Connect the unused interrogation lead to ground. 7. Connections to existing mating connector when replacing a Digital Interface Box with a Temposonics II LDT with a DPM 8. Shield: Connect Extension cable shield at J2 Pin B Table 6C (below) identifies the cable leads of an original Temposonics transducer.

  • Page 27: Digital Counter Card Connections

    Table 6D (below) identifies the terminations to make with the positive and negative interrogation lines (Pin 9 and 10) depending on the Temposonics II configuration being used in your application. It is impor- tant note that when using a “neuter” version Temposonics II, DO NOT connect both the positive and neg- ative interrogation leads at the same time —...

  • Page 28: Latch Pulse

    NOTE: The latch pulse is offered on Pin 3 and the latch inhibit is offered on Pin 24, but can be switched via jumpers on the board. 6.3.1 Latch Pulse The latch pulse is a nominal 1µs wide pulse that is used as a “data valid” signal. Data is invalid when the signal is high.

  • Page 29: Counter Cards - Natural Binary Output

    6.4 Counter Cards - Natural Binary Output Table 6E is based upon a counter card with [÷1] divider (factory set). A single card is capable of 18 bits natural binary output maximum. For the 27-28 MHz crystal, the resulting resolution and recirculations versus stroke are as follows: Resolution Circulations Stroke Length...
  • Page 30 NOTE: When using more than 18 bits Natural Binary or 17 bits BCD, a second counter card is required. Table 6F is based upon a counter card with [÷2] divider (factory set). A single card is capable of 17 bits natural binary output maximum.
  • Page 31 Table 6G is based upon a counter card with [÷4] divider (factory set). A single card is capable of 16 bits natural binary output maximum. For the 27-28 MHz crystal, the resulting resolution and recirculations versus stroke are as follows: Resolution Circulations Stroke Length...

  • Page 32: Counter Cards - Bcd Output

    6.5 Counter Card - BCD Output The Digital Counter Card can be provided with Binary Coded Decimal (BCD) output. BCD code is a bina- ry method of representing decimal numbers. The BCD code for a decimal number is a string of four-bit binary numbers, each of which represents one decimal digit.
  • Page 33 Table 6I (below) can be used to determine connections for Digital Counter Cards with BCD output. To determine the applicable connections, you must know the stroke length and resolution. Subtract the resolution from the stroke length to obtain a maximum reading (column 1). Refer to column 7 to deter- mine the decimal equivalent of each digit, knowing the desired decimal position.
  • Page 34 Example: Stroke = 200 in., Resolution = 0.001 in. Results: • Maximum Reading: 199.99 or 200 inches (See column 1) • Digits: 5 1/4 (1 is considered 1/4 digit) • Digital Counter Card Connections: Per column 4 (Pin Connections) • Least Significant Digit (LSD) Connections: Pins 8, 7, 14, 13 (Card A) •...

  • Page 35: System Calibration

    6.6 System Calibration There are no adjustments on the Digital Personality Module or on the transducer. Instead, the system is calibrated at the Counter Card or by external means. The scaling (inches per count) is determined by a fixed frequency crystal oscillator, while the zero point is determined by re-settable DIP switches on the counter card.
  • Page 36 3. Resetting the Counter Card with DIP Switches For this procedure, the receiver device must be capable of reading each of the Counter Card out- put bits. For example, the System CRT or LED display may be connected to each bit connection on the input module.
  • Page 37 Edge Card Connector Pin No. A. Reading in Counts (If available) B. Reading in Binary (From LEDs or Binary of ‘A’) C. Complement (Complement of ‘B’) 2 14 2 16 2 17 2 15 2 10 COUNTER 2 12 CARD 2 13 2 11 LO = 0...
  • Page 38 b. BCD Output Take the following steps (Refer to Figure 6-5, next page): 1. Before changing any DIP switch positions, record the factory-set positions for reference. 2. Move the magnet to the desired null position. Clamp it in place to prevent movement. 3.
  • Page 39 Edge Card Connector Digit Not Used Pin No. A. Reading in BCD (from LEDs, if used) B. Reading in Decimal (From BCD Indicator, if used) C. Complement (Subtract B from 9) D. Converted to BCD (Convert C to BCD) If a second Counter Card is provided (required for 5 or 6 digit BCD) use the following table in addition to the table above.

  • Page 40: Scaling The Digital Counter Card

    6.6.2 Scaling Digital Counter Cards 1. Scaling is not normally required for digital counter cards because most digital systems are sup- plied as scaled systems. (Refer to the earlier Subsection 6.4.1, page 18 for a discussion of scaling.) 2. Scaling is required for systems supplied as “unscaled” systems, or if the counter card is not matched to the transducer serial number.

  • Page 41: A How To Specify Systems With Digital Output

    APPENDIX A How to Specify Systems with Digital Outputs A.1 General To order a transducer with digital output, you must first determine the stroke length, the resolution, and the maximum acceptable update time for your application, and then select the appropriate options. Four sizing procedures are provided: Natural Binary Output, using the standard 27-28 MHz clock.
  • Page 42 4. If the update time is unacceptable, adjust the resolution and circulations to lower the update time. You can make a note of the parameters as you go along: Number of bits required: Resolution (R): Circulations (N): Update Time: less than Table 1A Calculations for Required Binary Bits Binary Bits Maximum Count...
  • Page 43 PROCEDURE II System Sizing for Natural Binary Output (Special Clock Frequency) Procedure I above is for 95% of all applications, and provides a scaled output with best possible manufacturing lead time. For applications requiring a shorter update time or a non-standard reso- lution, use the following procedure to determine an approximate crystal frequency, number of circulations, and update time.
  • Page 44 Example 2 1. 48 ÷ 0.0001 = 480,000 counts. From Table A-1, Given this requires 19 bits. • Stroke: 48 in. 2. f c = 0.11/0.0001 = 1100 MHz • Resolution: 0.0001 in. • Maximum Update Time: 30 milliseconds 3. Try N = 2, and divide f c by N: 1100/2 = 550. This Specify is greater than 56 MHz Number of bits required: 18...
  • Page 45 Table 3A Maximum Stroke Length vs. Number of Significant Bits BCD Value Required of ‘X’ Number of Bits (maximum stroke reading) 7.999 (8) 0111 . 1001 1001 1001 9.999 (10) 1001 . 1001 1001 1001 19.999 (20) 0001 1001 . 1001 1001 1001 39.999 (40) 0011 1001 .
  • Page 46 You can make a note of the parameters as you go along: Number of bits required: Resolution (R): Circulations (N): Update Time: less than PROCEDURE IV System Sizing for BCD Output - Other Resolutions/Non-Standard Clock Crystal For 0.1 in., 0.0001 in., 0.01 mm, and 0.001 mm, a non-standard counter card clock crystal must be estimated using the following procedure.
  • Page 47 Table 5A Recirculation Values for Resolutions Resolution (R) Recirculations (N) D = 2 D = 1 Remarks 0.1 in. Use 0.001 in. resolution and discard the two least significant digits. 0.01 in. Use 0.001 in. resolution and discard the least significant digit. 0.001 in.

  • Page 48: B Digital Personality Module (Dpm) Programming Procedure (Asynchronous Mode)

    APPENDIX B DPM Programming Procedure (Asynchronous Mode) NOTE: DPM programming switches are pre-set at the factory. Only authorized OEMs are permitted to program this device. Call MTS before making any adjustments to the switches. REMOVING THE TRANSDUCER COVER VOIDS THE WARRANTY. WARNING! The DPM is a static sensitive device and should be treated as such.
  • Page 49 Hexadecimal numbers 01 to 7F (for internal interrogation) and 81 to FF (for external interrogation) are printed on the switches. Choose the desired number of recirculations from Table 2B and set SW1 and SW2 to the corresponding hexadecimal numbers. Table 1B Resolution vs.
  • Page 50 Update time is programmed with SW3 using hexadecimal numbers 0 - F. Refer to Table 3B (next page). To find the minimum required update time (Umin) use the following procedure: FORMULA #1: where U(min) = (2.5 + NULL + STROKE) x .01086 ms/in. x N NULL = Null length in inches STROKE = Stroke length in inches (1 to 300 inches) N = Number of recirculations...
  • Page 51 Table 3B SW 3 Setting Update Time as a Function of Stroke and Recirculation (Internal Interrogation Only) Recirculations SW3 Setting (according to stroke length in inches) 1-32 32.1-65 65.1-102 102.1-135 135.1-175 175.1-215 215.1-250 250.1-290 290.1-300...

  • Page 52: C Modification To The Digital Interface Box

    APPENDIX C Modifications to the Digital Interface Box C.1 Modifying the Polarity of the Interrogation Pulse Consult drawings 650110 and 250068 before performing the following procedure. From INTERNAL to EXTERNAL interrogation From EXTERNAL to INTERNAL Interrogation 1. Remove the 4 cover screws from the DIB. 1.
  • Page 53 C.3 Changing Polarity of Interrogation Signal This procedure is used when connecting a negative pulse transducer to a positive pulse DIB, or when connecting a positive pulse transducer to a negative pulse DIB. NOTE: The only transducers with a negative interrogation pulse are original Temposonics I transducers with stroke lengths of 12 inches or less (the serial...

  • Page 54: Troubleshooting

    APPENDIX D Troubleshooting This section consists of troubleshooting procedures to be used when operational problems are encountered. NOTE: The following procedures are for general troubleshooting purposes. Purchase of replacement components should not be determined solely upon results of these tests. Consult MTS Sensors Division for recommendations before purchasing replacement system components.
  • Page 55 D.2 Power Supply Check IMPORTANT NOTE: This procedure is for checking the power supply voltage to the Digital Interface Box (DIB). The DIB is a discontinued product, but this procedure is included in this manuals to support prior installa- tions. This procedure will determine if the power supply rating is sufficient, or if there is a voltage drop occur- ring in the field wiring.
  • Page 56 D.3 Temposonics II Digital System Signals (+) Interrogation pulse sent to LDT (pin 10) (-) Interrogation pulse sent to LDT (Pin 9) Return Pulse from LDT (pin 8) 20µs 15µs RS422 (-) Start/Stop (pin 3) RS422 (+) Start/Stop (pin 4) DPM (-) Gate Out (pin 3) DPM (+) Gate Out (pin 4) Figure D-1...
  • Page 57 7. Connect an oscilloscope to J2 pin-E with respect to J2 pin-B to see the 1µs, TTL, interrogation pulse (see Figure D-4). Transducers with stroke lengths ≤ 12 inches should have a negative signal and trans- ducers with stroke lengths 13 inches or longer will have a positive signal. 8.
  • Page 58 Table 1D LED Test Bit Number Complement (A) Decimal Weight (B) A x B 0.001 HI = 1 LO = 0 0.512 2 10 LO = 0 HI = 1 1.024 1.024 2 11 HI = 1 LO = 0 2.048 2 12 LO = 0...
  • Page 59 IMPORTANT NOTE: The MTS Customer Service Department should be consulted before attempting any repairs in the field. Failure to con- sult MTS will void the warranty. D.5 Digital Interface Box (DIB) 1. Turn power OFF. 2. Disconnect transducer from DIB. 3.
  • Page 60 6. Observe the gate signals on Pins G(+) and K(-) on the J1 connector. A complimentary TTL level output (0 volts low, 5 volt high) should be present. Return the DIB to the factory for repair if gate signals are not present.
  • Page 61 Phone: + 03 3239-3003 Fax: + 03 3262-7780 Temposonics sensors are a registered trademark of MTS Systems Corporation All Temposonics sensors are covered by US patent number 5,545,984 and others. Additional patents are pending. Part Number: 03-98 550033 Revision F...

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