MODEL LVDT-8A USER MANUAL - ACCES I/O Products, Inc.
Contents
1. A Channel Return signal from Channel 0 GROUND TB2 Negative B Channel Excitation for Channel 1 Positive B Channel Excitation for Channel 1 Input Positive A Channel Return signal from Channel 1 4 Input Negative A Channel Return signal from Channel 1 1 Excitation Negative B Channel Excitation for Channel 2 za Excitation Positive Channel Excitation for Channel 2 ESSET Positive A Channel Return signal from Channel 2 BERI Negative A Channel Return signal from Channel 2 GROUND TB4 LE Negative B Channel Excitation for Channel 3 Positive B Channel Excitation for Channel 3 Input Positive A Channel Return signal from Channel 3 4 Input Negative A Channel Return signal from Channel 3 Exe Positive A Channel Return signal from Channel 4 F EITHER Negative A Channel Return signal from Channel 4 ER EIOH Negative B Channel Excitation for Channel 5 Positive B Channel Excitation for Channel 5 Input Positive A Channel Return signal from Channel 5 4 Input Negative A Channel Return signal from Channel 5 1 Excitation Negative B Channel Excitation for Channel 6 2 Excitation Positive B Channel Excitation for Channel 6 Positive A Channel Return signal from Channel 6 13 Manual LVDT 8A Negative A Channel Return signal from Channel 6 5 GROUND TB8 EET Negative B Channel Excitation for Channel 7 Positive B Channel Excitation for C2. External 24 VDC Power A jumper block located between the ribbon cable connectors and terminal block TB1 are used to connect 12V power to the LVDT 8 If computer power carried by the ribbon cable is used the jumpers should be placed in the PS positions If any external power supply is used then these jumpers should be placed in the EX positions and the power supply connected to the adjacent screw terminals on TB1 0 25 0 50 10V DISPLAY CHANNEL CHO CH7 m m n m n m m n u m u m n m m u e 5V e e ZERO 2 HE 2 5V HE 5 10V he oe Power on TBO 24v C GND _ NC RESERVED FOR Y FACTORY USE ip 0 50 N 5 OUTPUT ADJUST 8 00 CHO gt e EXCITATION VOLTAGE ALL OFF MIN ALL ON MAX 5 4h CIN 2 RP7 O mes ZI SL 8 Figure 2 1 Option Selection CHE TB4 EXCITATION RP8 L EXCITATION iNPUT L INPUT L GROUND swe TB8 L EXCITATION RP20 7 EXCITATION L INPUT Ll INPUT 5 GROUND sve 0 50 0 25 Manual LVDT 8A Chapter 3 Calibration Refer to the Block Diagram and Option Selection Map presented earlier in the manual for guidance as you perform the calibration procedure Eguipment Reguired A means of moving t
3. than one jumper at a time while the Card outputs are not affected the LEDs see the average of two channels One Jumper may be installed if desired when the Card is Under Use 5 Manual LVDT 8A The LVDT 8A has no incoming Computer communications It supplies the eight VDC outoputs as described above If a channel is not used no LVDT installed that channel s output will be near zero volts Specifications The LVDT 8 provides power excitation and signal conditioning for eight independent transducers Transducers Served Excitation Frequency This isa Factory installed option Power Required LVDT RVDT LVRT with primaryimpedances of150 Ohms or greater 5 KHz The Frequencies may be anywhere in the range of 1 to 10 KHz 24 18 to 36 VDC at 350 mA maximum Call Factory for installed power options Options Include Output Analog Voltage Environmental Operating Temperature Range Storage Temperature Range Humidity e Size LVDT 8 module Size T BOX 12 9 to 18 VDC at 700 mA maximum 48 36 to 75 VDC at 175 mA maximum External power supply 12 VDC or 15 VDC at 300 mA maximum If external power supply option is ordered connect 12VDC to terminal marked 24VDC connect Ground as marked and connect 12VDC to non marked terminal See Option Selection map 10 VDC or 5 VDC 0 C to 65 40 C to 100 C 0 to 90 non condensing 8 0 lon
4. 70 ACCES I O PRODUCTS INC 10623 Roselle Street San Diego CA 92121 858 550 9559 Fax 858 550 7322 contactus accesio com www accesio com MODEL LVDT 8A USER MANUAL FILE MLVDT8A A1c Notice The information in this document is provided for reference only ACCES does not assume any liability arising out of the application or use of the information or products described herein This document may contain or reference information and products protected by copyrights or patents and does not convey any license under the patent rights of ACCES nor the rights of others IBM PC PC XT and PC AT are registered trademarks of the International Business Machines Corporation Printed in USA Copyright 1995 2006 by ACCES Products Inc 10623 Roselle Street San Diego CA 92121 All rights reserved WARNING ALWAYS CONNECT AND DISCONNECT YOUR FIELD CABLING WITH THE COMPUTER POWER OFF ALWAYS TURN COMPUTER POWER OFF BEFORE INSTALLING A CARD CONNECTING AND DISCONNECTING CABLES OR INSTALLING CARDS INTO A SYSTEM WITH THE COMPUTER OR FIELD POWER ON MAY CAUSE DAMAGE TO THE I O CARD AND WILL VOID ALL WARRANTIES IMPLIED OR EXPRESSED 2 Manual LVDT 8A Warranty Prior to shipment ACCES eguipment is thoroughly inspected and tested to applicable specifications However should eguipment failure occur ACCES assures its customers that prompt service and support will be available All equipment originally manufactured by ACCES wh
5. displacement Each LVDT 8A card supplies power excitation and signal conditioning for up to eight independent LVDT transducers Each LVDT Signal Processor Chip has an Oscillator that provides the Excitation voltage for the associated Channels 0 through 7 This Excitation or primary voltage designated as B voltage is supplied to the LVDT The Signal Processor Chip also receives the VAC secondary or return voltage FROM the LVDT This voltage is designated as the A voltage The Signal Processor Chip now executes the following eguation Vout A B x 500uA x R2 Vout is the VDC analog output for the channel selected A B is the ratio of the secondary IN return VAC divided by the OUT VAC excitation voltage R2 is a scaling resistor Changing the value of this resistor allows the setting of 10 VDC or 5 VDC for full LVDT displacement or desired displacement The use of LVDT ratios rather than voltage levels alone to determine the VDC channel outouts improves output stability especially against temperature changes ED Display Utility Six LEDs are used to display the VDC output of a Jumper Selected channel 0 through 7 The LEDs are labeled 10V 5V ZERO 5V and 10V Whenever the selected output voltage is within 0 5 volts of a Marked LED that LED will be illuminated This Utility is not intended for Calibration It may be used to facilitate testing of channel s using On Card resources Do not install more
6. er at JP2 is installed atthe bottom position or notinstalled at all Adjustthe LVDT to the desired positive mechanical position nominally full scale Turn the potentiometer at RP1 until the output reads 10 00 volts Adjust the LVDT to its null position The output should be 0 0 volts Adjust the LVDT to the desired negative position The output should be 10 00 volts A slight adjustment of potentiometer RP1 may provide better accuracy across the full plus and minus scale 4 Failure to calibrate Not all LVDTs are alike LVDT may be mis connected or defective It is possible there is insufficient scale range for some LVDTs You are invited to call the factory if you have a LVDT 8A with a problem 5 After completing the calibration of Channel 0 the remaining seven channels may be installed and calibrated Itis suggested that this be done one channel at a time 6 Chan 0 use TB1 RP1 JP2 and SW1 Chan 1 use TB2 RP4 JP3 and SW2 Chan 2 use TB3 RP7 JP6 and SW3 Chan 3 use TB4 RP8 JP8 and SW4 Chan 4 use TB5 RP13 JP10 and SW5 Chan 5 use TB6 RP16 JP11 and SW6 Chan 6 use TB7 RP19 JP13 and SW6 Chan 7 use TB8 RP20 JP16 and SW8 7 The procedure for calibrating a channel other than Chan 0 is to use the same information from the above steps but using the symbol positions for the selected channel listed in step 6 above 10 Manual LVDT 8A 8 When all channels or all channels to be used are calibrated it is suggested t
7. g 203 mm X 4 74 wide 120 mm X 0 75 high 19 mm Fits inside of T BOX enclosure included 8 5 long 216 mm X 5 25 wide 133 mm X 2 0 high 51 mm 6 Manual LVDT 8A f a LVDT CHIP Figure 1 1 Block Diagram 7 Manual LVDT 8A Installing the Hardware The LVDT 8A is installed in a steel enclosure model T BOX Signals from the transducers to the LVDT 8 module are connected via eight terminal blocks labeled TB 1 through TB8 To ensure that there is minimum susceptibility to EMI proper EMI cabling techniques twisted pair wiring and in extreme cases shielded wiring should be used on input wiring Each of the terminal blocks has five terminals 1 2 Primary Winding 3 4 Secondary Winding 5 Chassis Ground O Aa Oo N Figure 1 2 Terminal Schematic The LVDT 8A board requires 350mA of 24VDC power Connect the 24V DC from your power supply to terminal block TB9 Pin 3 labeled 24V Connect Power Ground to TB9 Pin 2 labeled GND Under normal circumstances do not make ANY connections to TB9 Pin 1 Note To minimize possibility of extraneous noise short terminals 3 and 4 on any unused inputs DO NOT ground the inputs or connect them to pin 5 8 Manual LVDT 8A Chapter 2 Option Selection Output Channels All eight output channels are continuously available from output terminals labeled TB10 and TB11 These eight channels are also available from connector P1 pins 37 through 30
8. hannel 7 Input Positive A Channel Return signal from Channel 7 4 Input Negative A Channel Return signal from Channel 7 s ewe Table 4 2 LVDT Connections Channel 0 through Channel 7 Pin ff Label Use Outputs TB10 VDC Sigout 0 for Channel 0 N CH 1 VDC Sigout 1 for Channel 1 GND VDC Sigout 2 for Channel 2 Co CH3 VDC Sigout 3 for Channel 3 Outputs TB11 VDC Sigout 7 for Channel 7 CH6 VDC Sigout 6 for Channel 6 w 7 VDC Sigout 5 for Channel 5 GND CH4 VDC Sigout 4 for Channel 4 eo Table 4 3 Output Pinouts 24 VDC 48 VDC 12 VDC oo 24 VDC Input 48 VDC 12 VDC GND 24 VDC Ground Return GND GND GND z MAKE NO CONNECTION No Connection Connection No Connection 12 VDC Table 4 4 Power On Connections 14 Manual LVDT 8A Customer Comments If you experience any problems with this manual or just want to give us some feedback please email us at manuals accesio com Please detail any errors you find and include your mailing address so that we can send you any manual updates rs ACCES 1 0 PRODUCTS INC 10623 Roselle Street San Diego CA 92121 Tel 858 550 9559 FAX 858 550 7322 www accesio com 15 Manual LVDT 8A
9. hat the calibration of all channels be reviewed The LED Display Utility see Introduction can quickly locate a channel that needs recalibration Note Reverse the connections to terminals 3 and 4 if the LVDT direction is backwards from what you desire 11 Manual LVDT 8A Chapter 4 Connector Pin Assignments Two parallel 37 pin D Sub type connectors are provided on the LVDT 8A module The mating connectors are AMP type 747304 1 or eguivalent Ping Label Used for l FACTORY l UNUSED l UNUSED l UNUSED l UNUSED UNUSED UNUSED UNUSED 9 UNUSED 10 UNUSED 11 GROUND GROUND 12 UNUSED E UNUSED UNUSED UNUSED UNUSED UNUSED GROUND GROUND i UNUSED FACTORY 1 GROUND GROUND ln 1 Pe C 26 gu GM 23 UNUSED 29 30 CH7 OUTPUTTOA DCHANNEL7 31 CH 6 OUTPUT TO A D CHANNEL 6 32 CH5 OUTPUT TO A D CHANNEL 5 33 CH4 OUTPUT TO A D CHANNEL 4 34 CH3 OUTPUT TO A D CHANNEL 3 35 CH2 OUTPUT TO A D CHANNEL 2 36 CH 1 OUTPUT TO A D CHANNEL 1 L 3 Co ee Table 4 1 Connector Pin Assignments P1 12 Manual LVDT 8A 1 Excitation Negative B Channel Excitation for Channel 0 2 Excitation Positive Channel Excitation for Channel 0 ES Positive A Channel Return signal from Channel 0 Negative
10. he LVDT sensor in precision increments across the desired range of movement a micrometer jig An oscilloscope may be used to observe the primary and or LVDT waveforms A 4 digit DVM should be used for reading VDC and VAC voltages Calibration Procedure 1 Read LVDT Data Sheet Note freguency Range Input Voltage Excitation and Sensitivity mV out per displacement unit These elements should be compatible with the similar elements described below in step 2 2 Calibrating Channel 0 Select Channel 0 by installing a LVDT at terminal block TB2 See Figure 3 1 for locations See the installation at Installing the Hardware page 1 6 Set all four positions of SW1 to OFF Set LVDT displacement to full mechanical scale or to desired mechanical scale using the micrometer jig With power ON read excitation voltage which should be 1 5 VRMS to 3 5 VRMS Read return secondary voltage from LVDT at TB10 normal voltage should fall between 0 15 volts and 3 5 volts at full mechanical displacement If the excitation voltage level is low turn on position 1 of SW1 The excitation voltage should increase by a nominal 7 to 9 Both the excitation voltage and the return voltage should be sine waves with NO limiting at the top or bottom of the wave form 3 Scaling Output See Figure 3 1for positions A multi turn potentiometer RP1 and a jumper position JP2 are used to scale the VDC output to either 10 VDC or 5VDC For 10VDC the jump
11. ich is found to be defective will be repaired or replaced subject to the following considerations Terms and Conditions If a unitis suspected of failure contact ACCES Customer Service department Be prepared to give the unit model number serial number and a description of the failure symptom s We may suggest some simple tests to confirm the failure We will assign a Return Material Authorization RMA number which must appear on the outer label of the return package All units components should be properly packed for handling and returned with freight prepaid to the ACCES designated Service Center and will be returned to the customer s user s site freight prepaid and invoiced Coverage First Three Years Returned unit part will be repaired and or replaced at ACCES option with no charge for labor or parts not excluded by warranty Warranty commences with eguipment shipm ent Following Years Throughout your eguipment s lifetime ACCES stands ready to provide on site or in plant service at reasonable rates similar to those of other manufacturers in the industry Eguipment Not Manufactured by ACCES Equipment provided but not manufactured by ACCES is warranted and will be repaired according to the terms and conditions of the respective eguipment manufacturer s warranty General Under this Warranty liability of ACCES is limited to replacing repairing or issuing credit at ACCES discretion for any products which are proved to be defect
12. ive during the warranty period In no case is ACCES liable for conseguential or special damage arriving from use or misuse of our product The customer is responsible for all charges caused by modifications or additions to ACCES equipment not approved in writing by ACCES or ifin ACCES opinion the eguipment has been subjected to abnormal use Abnormal use for purposes of this warranty is defined as any use to which the eguipment is exposed other than that use specified or intended as evidenced by purchase or sales representation Other than the above no other warranty expressed or implied shall apply to any and all such eguipment furnished or sold by ACCES 3 Manual LVDT 8A Table of Contents Chapter 1 Introduction u Sa daw de de esa YG AA DI 5 Specifications en eI beh Es o ar et ILE eee eee WS d 6 Figure 1 1 Block Diagram i3 RS Bed ee ee A ed YG 7 Installing the 8 Figure 1 2 Terminal Schematic 8 Chapter 2 Option Selection ce UY ND DYD ER Oe dex WR 9 Figure 2 1 Option Selection 9 Chapter 3 Calibration lil GU ere YAA Y AIT ia 10 Chapter 4 Connector Pin Assignments 12 Table 4 1 Connector Pin Assignments P1 12 Table 4 2 LVDT Connection
13. s Channel 0 through Channel 7 14 Table 4 3 Output PinoutsS usuy eased eG ES we Ee e 14 Table 4 4 Power On Connections 14 4 Manual LVDT 8A Chapter 1 Introduction Linear Variable Differential Transformers LVDTs are the most commonly used passive type displacement transducers They operate under the principle of a mutual inductance change due to movement of a magnetic core This movement produces an electrical output proportional to the displacement of the core An AC 5KHz 1 5 to 3 5VRMS excitation voltage is applied to the primary winding see the specification section for other freguency options Two identical secondary windings symmetrically spaced from the primary are connected in a series opposing circuit Motion of the magnetic core varies the mutual inductance of each secondary to the primary which in turn determines the voltages induced from the primary to each of the secondaries If the core is centered between the secondary windings the voltage induced in the secondaries is identical and 180 degrees out of phase so there is no net output This is the NULL point If the core is moved off center the mutual inductance of the primary with one secondary is greater than with the other and an AC differential voltage appears across the secondaries in series For displacements within the operating range of the transducer used this voltage is a linear analog of the
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