LVDT-8U - ACCES I/O Products, Inc.
Contents
1. GO Ad ay at ee EU UT Son BNR CM a Figure 2 1 Option Selection Map I I FF GG eee 9 isan nen esa E a Red e ee ghee ae a ar RYN FAN 9 Chapter 3 GalibratiOn Ee rx hx ciet OR TR TR RH bre oar ebb rete 10 Equipment Required ei ei Rte a cR RUE Ron S EURO Rd RR OR 10 Calibration Procedure i esse eg RR RR ERR ERRARE RR ERRARE REA 10 Chapter 4 Connector Pin 510 11 Table 4 1 DB37 Connector Pin Assignments 1 AT Table 4 2 LVDT Connections Channel 0 through Channel 7 17 Table 4 3 Conditioned 12 Table 4 4 TB9 Power 13 Customer cr cassis Pew eka Owed E DAR amaa AE Dew RD a 14 4 Manual LVDT 8U Chapter 1 Introduction This eight channel LVDT signal conditioner has been designed to be as universal as possible By universal we mean it can provide conditioning for many different kinds of AC LVDTs from full bridge to half bridge Our goal was to design a board that would be useful to as wide of a market as possible without the need to customize each board for each customer s unique needs Significant enhancements and improvements have been made over our2. eT AD698AP DATA LVDT CHIP EXCITATION INPUT GND Figure 1 1 Block Diagram 6 Manual LVDT 8U Installing the Hardware The card may be installed in an optional steel enclosure model RT BOX or T BOX Sensors Signals from the transducers to the card module are connected via removable 5 pin terminal blocks labeled TB1 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 1 2 Primary Winding 3 4 Secondary Winding 5 Chassis Ground BR O N Figure 1 2 Full Bridge LVDT Sensor Terminal Schematic 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 O Aa WwW Figure 1 3 Half Bridge LVDT Sensor Terminal Schematic 7 Manual LVDT 8U Power The board requires 700mA of from 9VDC to 36VDC power Connect the VDC lead from your power supply to terminal block TB9 Pin 1 labeled 15V Connect Power Ground to TB9 Pin 2 labeled GND Under normal circumstances do not make ANY connections to TB9 Pin 2180 02 1 1 34 PSI 3 2 2 an 1515D24HN N GNB 5 2 16 a vs 17 xo 18WPWRSUPPLY 9 h 33 6 A 18 TB3 5MM 19 Figure 1 4 Input Power Circuit Schematic Card Power Options The card requi
3. 70 ACCES 1 0 PRODUCTS INC 10623 Roselle Street San Diego CA 92121 858 550 9559 Fax 858 550 7322 contactus accesio com www accesio com MODEL LVDT 8U EIGHT CHANNEL AC LVDT UNIVERSAL SIGNAL CONDITIONER USER MANUAL MLVDT8U B2k 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 by ACCES I O 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 8U Warranty Prior to shipment ACCES equipment is thoroughly inspected and tested to applicable specifications However should equipment failure occur ACCES assures its customers that prompt service and support will be available All equipme
4. M should be used for reading VDC and VAC voltages Calibration Procedure Note Reverse the connections to terminals 3 and 4 if the LVDT direction is backwards from what you desire 1 Read LVDT Data Sheet Note frequency 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 Calibrating Channel 0 Select Display Channel 0 by placing a jumper on the Display Channel jumper block for Channel 0 Set LVDT displacement to full mechanical scale or to desired mechanical scale using the micrometer jig Scaling Output See Figure 2 1 for positions Two 20 turn potentiometers are used per channel to scale the VDC output 10 VDC and to adjust the offset Adjust the LVDT to the desired positive mechanical position nominally full scale Turn the gain potentiometer until the output reads 10 00 volts Adjust the LVDT to its null position The output should be 0 0 volts adjust the offset potentiometer as required Adjust the LVDT to the desired negative position The output should be 10 00 volts A slight adjustment of the gain and offset potentiometers may be necessary to provide the best accuracy across the full plus and minus scale Failure to calibrate Not all LVDTs are alike An LVDT may be mis connected or defective It is possible there is insufficient scale range for some LVDTs You can move your sensor connection to an unuse
5. Negative A Channel Return signal from Channel 0 through Channel 7 GROUND Table 4 2 LVDT Connections Channel 0 through Channel 7 Outputs TB10 CHO VDC Signal Out 0 for Channel 0 E CH 1 VDC Signal Out 1 for Channel 1 CH2 VDC Signal Out 2 for Channel 2 CH 3 VDC Signal Out 3 for Channel 3 Outputs TB11 E CH4 VDC Signal Out 4 for Channel4 VDC Signal Out 4 for Channel4 Out 4 for Channel 4 CH5 VDC Signal Out 5 for Channel5 VDC Signal Out 5 for Channel 5 Out 5 for Channel 5 GND CH6 VDC Signal Out 6 for Channel 6 CH7 VDC Signal Out 7 for Channel 7 Pee Sonal aT ree J Out 7 for Channel 7 Table 4 3 Conditioned Outputs N A ai oo NISJA BR ww JoJ ry 12 Manual LVDT 8U Pin Label Use 9VDC to 36VDC 15VDC or 9VDC to 36VDC 48VDC 48VDC For ON Card For ON Card power For ON Card power supplies power supplies use supplies use pins 1 use pin 1 and 2 only pin 1 and 2 only and 2 only 15V All Positive Inputs VDC 48VDC Al Ground Returns RETURN Ground Returns RETURN RETURN 15V EET Rmi OFF Card power poo No Connection Connection 15V poo Table 4 4 TB9 Power Connections 13 Manual LVDT 8U 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 a
6. d channel to confirm sensor problems vs board channel problems You are invited to call the factory if you have a card with a problem After completing the calibration of Channel 0 the remaining seven channels may be installed and calibrated using the above procedure per channel 10 Manual LVDT 8U Chapter 4 Connector Pin Assignments One 37 pin D Sub type connector is provided on the module with pin compatibility to one of our A D cards The mating connectors are AMP type 747304 1 or equivalent Pin olo o cn gt lo m o e o o gt o no ooopoo o o o no n nmno NIIA A oI IN gt olol loin Ioa Aa A SoN elo Label VINEX UNUSED UNUSED UNUSED UNUSED UNUSED UNUSED UNUSED UNUSED UNUSED GROUND UNUSED UNUSED UNUSED UNUSED UNUSED UNUSED GROUND UNUSED VINEX GROUND GROUND GROUND GROUND GROUND GROUND GROUND UNUSED UNUSED CH7 CH 6 CH5 CH 4 CH3 CH2 CH 1 CH O 15V INPUT GROUND o OUTPUT TO A D CHANNEL 1 OUTPUT TO A D CHANNEL 0 Table 4 1 DB37 Connector Pin Assignments P1 11 Manual LVDT 8U Pin Label Use TB1 through TB8 Negative B Channel Excitation for Channel 0 through Channel 7 Excitation Positive B Channel Excitation for Channel 0 through Channel 7 fd Input Positive A Channel Return signal from Channel 0 through Channel 7 Input
7. ddress so that we can send you any manual updates a ACCES 1 0 PRODUCTS INC 10623 Roselle Street San Diego CA 92121 Tel 858 550 9559 FAX 858 550 7322 www accesio com 14 Manual LVDT 8U
8. ified in the range of 1Hz to 20 kHz 10 This is a Factory installed option which should be specified at the time of purchase Frequencies may be the same or different for each LVDT channel Excitation Voltage 3Vrms The Voltage may be specified in the range of 2 to 24Vrms This is a Factory installed option which should be specified at the time of purchase Voltages may be the same or different for each LVDT channel 40mA rms typical per channel based on the transducer primary winding impedance 5 Manual LVDT 8U Power Required 9 to 36 VDC 700mA max via DC DC converter Call Factory for installed power options Should be specified at the time of purchase Options Include 48 36 to 75 VDC at 175 mA maximum External power supply no on board DC DC converter 12 VDC or 15 VDC at 300 mA maximum Output Analog Voltage 10 VDC Environmental Operating Temperature Range 0 C to 65 C Ext temp version available for 40 to 85 C operation Storage Temperature Range 40 C to 100 C e Humidity 0 to 90 non condensing e Size card module 8 0 long 203 mm X 4 74 wide 120 mm X 0 75 high 19 mm Fits inside of RT BOX enclosure Size RT BOX 8 5 long 216 mm X 5 25 wide 133 mm X 2 0 high 51 mm CIRCUITS TYPICAL OF EIGHT 8 o SL OFFSET ADJUST GAIN 15V ADJUST 66646446 H Oz Lu _ FD Q t U lt TO EACH CH POSITION
9. nt originally manufactured by ACCES which is found to be defective will be repaired or replaced subject to the following considerations Terms and Conditions If a unit is 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 equipment shipment Following Years Throughout your equipment 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 Equipment 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 equipment manufacturer s warranty General Under this Warranty liability of ACCES is limited to replacing repairing or issuing credit at ACCES discretion for any
10. products which are proved to be defective during the warranty period In no case is ACCES liable for consequential 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 if in ACCES opinion the equipment has been subjected to abnormal use Abnormal use for purposes of this warranty is defined as any use to which the equipment 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 equipment furnished or sold by ACCES 3 Manual LVDT 8U Table of Contents Chapter 1 Introduction sssi sars eevee RR ERE Ee RA DYD EG DRO E E DAR Pe 5 Princ pcc 5 Figure 1 1 Block 6 Installing the Hardware sigue ern Ree eorura pu nd Y FU Ra ERE SN FRE RUE FUP a Figure 1 2 Full Bridge LVDT Sensor Terminal T Figure 1 3 Half Bridge LVDT Sensor Terminal 5 T Figure 1 4 Input Power Circuit 5 8 Chapter 2 Option Selection cuis pasa i tus aco t esc en Rer REOR be ATA Rok RR KORR E ER a a Output Channels ance depen ie oe unt o a ER
11. recent 8A Signal Conditioner For example Addition of a 25 turn offset adjustment potentiometer per channel Synchronized excitation frequencies Channel 0 serves as the Master while Channel s 1 through 7 are slaves following Channel 0 s frequency Higher available gains for super sensitive LVDTs and for half bridge sensors At the core of the board are eight individual conditioner chips the flexible and powerful Analog Devices AD698 LED 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 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 The card has no incoming computer communications It supplies the eight VDC outputs as described above If a channel is not used no LVDT installed that channel s output will be near zero volts Specifications The card provides power excitation and signal conditioning for eight independent transducers Transducers Served LVDT RVDT LVRT etc Excitation Frequency 10 kHz The Frequencies may be spec
12. res 15 VDC and 15 VDC for internal operating power The preferred source of this power is from a Power Supply DC DC converter installed on the card This power supply provides a regulated 15 Volts derived from an external source within one of the two available ranges 12 24 9 to 36 VDC at 700 mA maximum 48 36 to 75 VDC at 175 mA maximum In addition full 10 Volt Data Outputs and a correct LED display utility which is referenced to 15 Volts will result An external 15 Volt power supply may be used to power the card s internal circuits with some reduction in performance First reverse voltage protective diodes are located in series with the 15 Volt and the 15 Volt external power inputs These diodes reduce the 15 Volts to 14 5 Volts approximately This Voltage reduction should not affect the Data Output However the LED display utility will have a half Volt error This error may be corrected at the factory If the external power supply is used to power other external devices as well noise generated by these devices may be added to the card s DATA output An external 12 Volt power supply is NOT recommended 10 Volt Data output could not be supported 7 5 Volt Data would be the maximum The LED display utility would be in error up to 5 Volts too much for correction 8 Manual LVDT 8U Chapter 2 Option Selection While no software is required to use this signal conditioner you may ins
13. tall a software package for this card off our master CD This will install this user manual some general utilities and the card setup program which is intended to be used in conjunction with this manual All these items will be accessible from the start menu windows users 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 4 30 N o Y 0 25 10 DISPLAY CHANNEL EXCITATION CHO CH7 EXCITATION INPUT INPUT GROUND 4 70 EXCITATION EXCITATION INPUT INPUT GROUND io 0 50 OFFSET GAIN 0 50 ADJUSTMENT MB x POTENTIOMETER POTENTIOMETER Figure 2 1 Option Selection Map External Power A terminal block labeled TB9 located on the corner of the board is used to connect power to the card With any on board DC DC converter option only make connections to TB9 on the PWR terminal and GND terminal for the return 9 Manual LVDT 8U 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 Equipment Required A means of moving the 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 DV
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