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Generally, company names and trade names described in this Instruction Manual are trademarks or registered
trademarks of the companies.
This Instruction Manual may not be copied or reproduced, in whole or part, without consent of KYOWA.
Copyright © Kyowa Electronic Instruments Co., Ltd. All rights reserved.
The contents of the Instruction Manual are subjected to change without prior notice.
INSTRUCTION MANUAL
CDV/CDA-900A-DC
SIGNAL CONDITIONER
Thank you for purchasing KYOWA's product CDV/CDA-
900A-DC Signal Conditioner.
Read this Instruction Manual carefully in order to make full
use of the high performance capabilities of the product.
Do not use the product in methods other than described in
this Manual.
IM-A-1006 October 2013
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Table of Contents
Troubleshooting
Related Manuals for KYOWA CDV-900A-DC
Summary of Contents for KYOWA CDV-900A-DC
- Page 1 Generally, company names and trade names described in this Instruction Manual are trademarks or registered trademarks of the companies. This Instruction Manual may not be copied or reproduced, in whole or part, without consent of KYOWA. Copyright © Kyowa Electronic Instruments Co., Ltd. All rights reserved.
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Page 3: Table Of Contents
CONTENTS STANDARD ACCESSORIES ................................ 1 SAFETY PRECAUTIONS .................................. 1 PRIOR TO USE ...................................... 1 SAFETY SYMBOLS ..................................... 1 LIMITED LIFE PARTS AND PREVENTIVE MAINTENANCE .................... 4 CDV/CDA-900A-DC REPLACEMENT BEFORE THE END OF SERVICE LIFE ............ 4 PRECAUTIONS ON CE MARKING .............................. 4 NOTATIONS USED IN THE INSTRUCTION MANUAL ...................... 5 ... - Page 4 5-14. BRIDGE EXCITATION VOLTAGE .......................... 31 5-15. REMOTE SENSING ................................ 3 2 5-16. USER-SPECIFIED REGISTRATION FUNCTION ..................... 3 3 5-16-1 Items that can be Registered on the CDV-900A-DC ...................... 33 5-16-2 Items that can be Registered on the CDA-900A-DC ...................... 35 6. OPTIONS ........................................ 3 7 6-1.
- Page 5 9-1-2 Response Frequency Characteristic ............................ 47 9-2. HOW TO CALCULATE STRAINS ............................ 4 8 9-2-1 Method of Calculation Applicable to Strain Gage ....................... 48 9-2-2 Correction Required due to the Number of Strain Gages Used .................. 49 9-2-3 When using strain gage having gage factor other than 2.00 ..................... 52 9-2-4 Calculating Methods Applicable to Strain Gage Transducer ...
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Page 7: Standard Accessories
PRIOR TO USE For safe use of the CDV/CDA-900A-DC, do not forget to read the “Safety Precautions” prior to use. Kyowa Electronic Instruments Co., Ltd. assumes no liability for any damage resulting from the user’s failure to comply with the safety precautions. - Page 8 WARNING Power Supply To prevent a fire hazard, before connecting the power cable, be sure to check the local line voltage is matched with the operating voltage specified for the CDV/CDA-900A-DC. Power Cable To prevent an electric shock or fire hazard, use the accessory power cable. Read the Instruction Manual first, connect the power cable to the CDV/CDA-900A-DC with the CDV/CDA-900A-DC turned OFF and connect the power cable to the power.
- Page 9 CAUTION After the power OFF, wait more than 5 seconds to power ON again. If the power switch is repeated turned ON and OFF within 5 seconds, fuse may blow out due to rush current generated by switching the power ON and the CDV/CDA-900A-DC reliable function may not be guaranteed.
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Page 10: Limited Life Parts And Preventive Maintenance
The CDV/CDA-900A-DC will results in malfunctions or degraded performance. To operate the CDV/CDA-900A-DC normally, finding a sign of the CDV/CDA-900A-DC failure early by daily/periodic inspections and taking the corrective action are required. For inspection, contact KYOWA or our representatives. * All components do age and will fail. -
Page 11: Notations Used In The Instruction Manual
NOTATIONS USED IN THE INSTRUCTION MANUAL Notational Words To express strain, “10 strain”, m/m” or “ ” is used properly. This Manual uses “ ” relating to the on-panel indications, and “ m/m” when referring to strain in general. The words suffixed by"*" are explained in "10 GLOSSARY." The value converted in SI (the International System units) is given in parentheses after each conventional expression of a unit. -
Page 12: Product Outline
1. PRODUCT OUTLINE 1-1. PRODUCT OUTLINE The CDV/CDA-900A-DC is a strain amplifier that incorporates an DC bridge excitation. When compared to a AC type strain amplifier, the CDV/CDA-900A-DC generally marks broadband, higher input impedance, and better nonlinearity. In addition to these, the CDV/CDA-900A-DC provides unique features as follows. Features ... -
Page 13: 1-2.System Configuration
To measure a strain converted in electric signals, a calibration signal is used. The CDV/CDA-900A-DC uses a calibration signal that has been certified through a standardizing equipment Kyowa maintains. For how to use strain gages or how to obtain the application, see "9. APPENDIXES."... -
Page 14: Parts And Functions
2. PARTS AND FUNCTIONS 2-1. FRONT PANEL ３ １ ５ ４ ６ ２ ７ １０ ８ １１ ９ ①TEDS switch Press and hold the TEDS switch. The TEDS switch lights up in blue, the setting mode becomes "TEDS MODE." ②ACTL LOAD switch Press and hold the ACTL LOAD switch. - Page 15 (ON: The POWER switch is in the pressed position. OFF: The POWER switch is in the released position.) ⑬Indicator lamp Flickers when the remote sensing is ON (CDV-900A-DC). Lights up after executing the cable-resistance-compensation function (CDV-900A-DC) Lights up after executing the bridge-resistance-compensation function (CDA-900A-DC).
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Page 16: Rear Panel
2-2. REAR PANEL ２ １ ３ ６ ４ ７ ５ ① INPUT connector△ NDIS connector ！ Connects with a strain gage transducer or a bridge box. ② OUTPUT A connector△ BNC connector ！ Outputs voltage based on the preset internal gain when the strain is input. Outputs the same voltage with the OUTPUT B connector. -
Page 17: Preparation
3. PREPARATION This chapter describes necessary preparation before turning ON the power and how to use a single unit of the CDV/CDA-900A-DC. 3-1. HOW TO SET UP INPUT/OUTPUT INSTRUMENTS When measuring strain with the CDV/CDA-900A-DC, connect input signal, output instrument and power to the CDV/CDA-900A-DC. -
Page 18: Basic Operations
For connection of a strain gage, a bridge box of the full White bridge system can be conveniently used. MEMO Input Wire colors described in figures are typical colors of KYOWA strain gage transducer. Connection of a bridge and plug (4-wire) Transducer's case Transducer's case NDIS connector NDIS connector Shield... -
Page 19: Connection Of Output
At this time, all LEDs will light up for approximately 1 second. After that, measuring conditions are set and the CDV/CDA-900A-DC becomes measuring state. NOTE If " " appears after illumination of all LEDs, it is the indication of abnormality that has occurs to the internal CPU control program. Contact Kyowa or our representatives. -
Page 20: Turning Off The Power
4-3-2 Turning OFF the Power Press the POWER switch until it clicks. Make sure the POWER switch is in the released (OFF) position. All indications disappear. NOTE The CDV/CDA-900A-DC maintains all measuring parameters in its internal nonvolatile memory all the time. However, saving of parameters may fail if the power is turned OFF immediately after the renewal. -
Page 21: Basic Balancing
4-6. BASIC BALANCING The CDV/CDA-900A-DC performs balancing completely electronically. Make sure that input signals are connected, and then press the BAL switch 2 times. Five (5) seconds later, balancing will then be carried out. BAL switch MEMO After balancing is executed, the panel meter will not necessarily read exactly 0 but several mV remains. -
Page 22: Setting Low-Pass Filter
MEMO The rated capacity and rated output of the strain gage transducer are found in its Test Data Sheet. When using the TEDS installed strain gage transducer, read the TEDS information to set the internal gain. The internal gain can be easily set. When using the actual load or external calibrator, use the ACTL LOAD to set the internal gain. -
Page 23: Sensitivity Fine Adjustment
4-7-5 Sensitivity Fine Adjustment Capable of fine adjusting the pre-set internal gain. Either of the following 2 methods can be used for the sensitivity fine adjustment. Basically, use the (1). It is convenient to use the (2) for " ACTL LOAD MODE". (1) Sensitivity fine adjustment by using the CAL ON switch With pressing the + of the CAL ON switch, press the + or –... -
Page 24: Functions
5. FUNCTIONS This chapter describes all the CDV/CDA-900A-DC functions in detail as well as advanced usage. 5-1. INPUT The CDV/CDA-900A-DC is a strain measuring instrument itself, and it can also work as a DC amplifier. Using as a strain measuring instrument ("STRAIN MODE") Connectable sensors are the following. -
Page 25: Output
The bridge resistance includes cable resistance. Note that this function is not available in the "DC AMP MODE." Ranges of the bridge resistance check are as follows. CDV-900A-DC CDA-900A-DC Bridge excitation Range of the bridge resistance... -
Page 26: Balancing
NOTE To execute correct measurements, the bridge resistance should be within the range of the bridge resistance check. When connecting or changing the sensor input, before setting the internal gain, be sure to execute the bridge resistance check. Note that the bridge resistance includes cable resistance. Therefore, when using an extremely long cable, "... -
Page 27: Internal Gain
5-7. INTERNAL GAIN Setting methods for the internal gain are the following 3 methods that use CAL, TEDS, or ACTL LOA. In general, CAL is used. When the measuring target is the TEDS installed strain gage transducer, set the internal gain with the TEDS for easy setting. - Page 28 When the measuring target is a strain gage transducer The rated output ( m/m) of the KYOWA strain gage transducer is described in the Test Data Sheet. Capable of conducting the optimum internal gain setting by using the rated output. If the strain output is not described in the rated output, the strain output can be obtained from the gage factor Ks Rated output ( V/V)×...
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Page 29: Setting Internal Gain With Teds
NOTE DC AMP lamp is OFF: "STRAIN MODE" DC AMP lamp is ON: "DC AMP MODE" "STRAIN MODE": Turn OFF the SETTING SWITCH 4. "DC AMP MODE": Turn ON the SETTING SWITCH 4. To change the settings, after switching the SETTING SWITCH, be sure to turn ON and OFF the power. For the SETTING SWITCH, see "5-1. - Page 30 MEMO A physical quantity (converted from the voltage) appears on the monitor in "TEDS MODE." For displaying the voltage on the monitor, press and hold the TEDS switch to change the sensitivity registration mode the "NORMAL MODE." (Although the TEDS switch light out, the settings are saved.) With the "TEDS MODE", by pressing the SET switch, "...
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Page 31: Setting Internal Gain With Actual Load
5-7-3 Setting Internal Gain with Actual Load The CDV/CDA-900A-DC can set the internal gain with the actual load. When using an extension cable, set the internal gain with the actual load for more accurate measurement. Proper operation procedures are as follows. ①... -
Page 32: Calibration Signal
NOTE With a low-pass filter having the Butterworth characteristic, the phase delay becomes unproportional to the frequency nearby a cutoff frequency in use. Accordingly, fast rising or falling signals that pass the filter will cause an overshoot. To prevent it, set the low-pass filter to a cutoff frequency about 10 times larger than the frequency of strain signals. -
Page 33: Application Of Centralized Connector
5-11. APPLICATION OF CENTRALIZED CONNECTOR The CDV/CDA-900A-DC provides a centralized connector on its rear panel. In general, connect the centralized connector to the DC power by using the accessory DC power cable. The connector also enables connection of input/output signals. Names and functions of these signals are shown in the following table. For details of external control signals (with REM on the signal name) in the table, see "5-12. -
Page 34: Remote Control
5-12. REMOTE CONTROL The following functions can be controlled remotely. ① Execution of balancing: REM BAL signal ② Outputting CAL: REM +CAL signal, REM -CAL signals ③ Execution and cancellation of key-lock: REM KEYLOCK signal Remote control has the same significance as manual operation of the front panel switches that control the CDV/CDA-900A-DC functions. -
Page 35: External Connection
For details of the centralized connector, see "5-11. APPLICATION OF CENTRALIZED CONNECTOR." Shown at the right are the recommended circuits for remote control. Remote control signal If a circuit other than shown is used, contact KYOWA or Direct contact input Switch our representatives. ＋5Ｖ... - Page 36 CDV-900A-DC CDA-900A-DC Bridge 120 ohm 350 ohm resistance Bridge Excitation excitation 10 V current 8.3 mA 16.7 mA 5.7 mA 14.3 mA 28.6 mA voltage (equivalent to (1 V) (2 V) (2 V) (5 V) (10 V) the voltage) OFF: STRAIN...
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Page 37: Bridge Excitation Voltage
The CDV/CDA-900A-DC permits selection of a bridge excitation voltage , from 1 V, 2 V, 5 V, 10 V, and OFF. As shipped from the factory, 2 V is set to the CDV-900A-DC. The CDV/CDA-900A-DC permits selection of an excitation current , from 8.3 mA, 16.7 mA, 5.7 mA, 14.3... -
Page 38: Remote Sensing
5-15. REMOTE SENSING The CDV-900A-DC can measure data by remote sensing. With the remote sensing, bridge excitation voltage will be stabilized by compensating errors due to conductor resistances of cables and ambient temperature changes. The remote sensing has 2 settings; AUTO and ALWAYS ON. -
Page 39: User-Specified Registration Function
The CDV/CDA-900A-DC has an additional function; user-specified registration function. Measuring accuracy will be increased by using the user-specified registration function. Note that the user-specified registration items are different on the CDV-900A-DC and on the CDA-900A-DC. 5-16-1 Items that can be Registered on the CDV-900A-DC The user-specified registration items on the CDV-900A-DC are the cable-resistance-compensation function and setting the remote sensing "ALWAYS ON",... - Page 40 NOTE If the cable resistance is not measured correctly, " " appears on the monitor. Press the SET switch to return to the "NORMAL MODE." Note that all settings of the cable-resistance- compensation function is canceled. Causes of the errors are the cable resistance is exceeding the measuring range or the bridge resistance is different from the pre-set value.
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Page 41: Items That Can Be Registered On The Cda-900A-Dc
(2) Setting the remote sensing "ALWAYS ON" You can set the remote sensing "ALWAYS ON". Normally the remote sensing is "AUTO." To use the remote sensing cable longer than 200 m, set the remote sensing "ALWAYS ON." For the remote sensing, see "5-15. REMOTE SENSING." Proper operation procedures are as follows. - Page 42 NOTE Do not execute the bridge resistance check while using the bridge-resistance-compensation function. Although a sensor is connected correctly, an error may appear. Note that this function is not available in the "DC AMP MODE." After turning OFF the power, all the setting of the bridge-resistance-compensation function is reset. After turning OFF and ON the power, be sure to re-set the function again.
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Page 43: Options
6. OPTIONS This chapter describes all options that can be used together with the CDV/CDA-900A-DC. These options are available for separate purchasing. 6-1. BRIDGE BOX The bridge box can be conveniently used for measuring strains with strain gages. The bridge box incorporates highly stable resistors to allow a variety of strain gage bridges. -
Page 44: Wiring To Bridge Box
6-1-3 Wiring to Bridge Box How to configure a variety of strain gage bridge is described below. Wiring to the bridge box Bridge Circuit Gage System Quarter bridge system (2-wire system) Quarter bridge system (3-wire system) Half bridge system Half bridge system (3-wire active-active system) Full bridge system... -
Page 45: Amplifier Stand
6-2. AMPLIFIER STAND FA-1B When operating a single unit of the CDV/CDA- 900A-DC, this rubber made stand is used for fixing. 6-3. EXTENSION CABLE N For connecting the bridge box or strain gage transducers at a remote place. The cable ends are provided with connectors. -
Page 46: Trouble Shooting
KYOWA may refuse to repair if the product has been damaged by failure to follow the instructions given in this Instruction Manual or if the product has been disassembled or remodeled by the user. -
Page 47: Output Is Available
The output cable may not correctly connected to the connector or broken. Repair or replace the output cable. Contact KYOWA or our representatives if the trouble still remains after carrying out the proper remedy. 7-4. INSTABILITY OF THE ZERO POINT ... - Page 48 Interference due to a measuring object’s electric potential This interference occurs when a measuring object has a certain electric potential, AC or DC. In this case, grounding the CDV/CDA-900A-DC does not necessarily bring about a good result, but connection of a measuring object to the CDV/CDA-900A-DC can be the solution in some cases.
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Page 49: Specifications
8. SPECIFICATIONS 8-1. SPECIFICATIONS Model CDV-900A-DC CDA-900A-DC Measuring target Strain gage, strain gage transducer, voltage The number of channels 1 CH/unit Applicable bridge resistance 60 to 1000 ohm 120 ohm, 350 ohm Gage Factor 2.00 fixed Constant voltage Constant current Bridge excitation voltage 8.3 mA, 16.7 mA (120 ohm),... - Page 50 Model CDV-900A-DC CDA-900A-DC Noise Low-pass filter Noise (converted value) FLAT 40 V or less 100k Hz 16 V or less 10k Hz or less 1k Hz or less 100 Hz or less 10 Hz or less Condition Bridge Excitation voltage: 2 V Bridge Excitation current: 16.7 mA...
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Page 51: Block Diagram And Operation Principle
Model CDV-900A-DC CDA-900A-DC Operating temperature and -10 to 50℃, 20 to 85%RH (noncondensing) humidity range Storage temperature range -30 to 70℃ Power supply 10.5 to 15 VDC Approximately 4 W (at 12 VDC） Dimensions 49 (W) × 128.5 (H) × 262.5 (D) mm (excluding protrusions) Weight Approx. -
Page 52: Dimensional Drawing
8-3. DIMENSIONAL DRAWING 2-φ3 49mm 262.5mm... -
Page 53: Appendixes
9. APPENDIXES 9-1. LOW-PASS FILTER CHARACTERISTIC Section 9-1-1 shows the characteristic of the low-pass filter incorporated in the CDV/CDA-900A-DC. In section 9-1-1, the frequency characteristic is normalized against a cutoff frequency. About the relation between the amplitude and the phase, first obtain the ration of F/Fc and then read it from the diagram below. In addition, frequency response characteristic when cutoff frequency of the CDV/CVA-900A-DC is set to FLAT is shown in the section 9-1-2. -
Page 54: How To Calculate Strains
9-2. HOW TO CALCULATE STRAINS This section describes how to measure strains and stress with the CDV/CDA-900A-DC. 9-2-1 Method of Calculation Applicable to Strain Gage Suppose that a strain waveform as shown at right was obtained. The diagram shows a positive (+) calibration signal value recorded at the top of the strain waveform. -
Page 55: Correction Required Due To The Number Of Strain Gages Used
[sec] ④ Frequency of the strain waveform If vibrations are periodically generate, a frequency can be calculated. Measure the length of 10 or so cycles, then obtain their average t [mm]. Compare the result with the marker interval t ... - Page 56 (1) When using both gages to measure strains ① When using 2 strain gages in the arrangement shown in the right, multiply the measurement value 0 by 1/2. ...
- Page 57 ② When using 4 strain gages in the arrangement shown in the right, multiply the measurement value 0 by 1/4. (2) When using active gage (A) and dummy gage (D), which is at a right angle to the former ①...
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Page 58: When Using Strain Gage Having Gage Factor Other Than 2.00
9-2-3 When using strain gage having gage factor other than 2.00 Correct measured values, using the following equation. where, K : The gage factor of a gage in use... -
Page 59: Calculating Methods Applicable To Strain Gage Transducer
9-2-4 Calculating Methods Applicable to Strain Gage Transducer A strain gage transducer measures a physical variable such as load, pressure, torque, displacement, acceleration or other after conversion into electric signals through strain gages. The CDV/CDA-900A-DC is designed to measure strains. The amount of a measured strain has to be converted into a physical quantity by using the calibration factor or the rated output stated in the Test Data Sheet of a strain gage transducer. -
Page 60: Correction Required When An Extension Cable Was Used
1. 005 1. 010 1. 015 1. 020 1. 040 MEMO Shown in the above tables are correction factors applicable to the KYOWA extension cable (0.5 mm , 4- conductor shielded cabtire cable) that is described in "6-3. EXTENSION CABLE N". -
Page 61: Trouble Shooting
Contact KYOWA or our representatives even if the error indication appears after executing the remedies. NOTE If the output voltage of the OUTPUT A or OUTPUT B exceeds ±11V, numbers or characters on the monitor flicker. -
Page 62: Internal Gain And Input Strain
9-4. INTERNAL GAIN AND INPUT STRAIN 【BV=1V】 Switches Input range [ ] Internal Sensitivity Fine Sensitivity Fine gain CAL [ ] VOLTAGE OUT [V] Adjustment ×１ Adjustment ×１/2.5 ×200 5000 0.50 ±100,000 ±250,000 ×2000 5000 5.00 ±10,000 ±25,000 ×10000 2000 10.00 ±2,000 ±5,000... -
Page 63: Glossary
10. GLOSSARY *1 TEDS TEDS is an acronym for Transducer Electronic Data Sheet. It is a table of digitized sensor's information that is held in the transducer. Capable of conducting applicable measurement without manual setting by reading the information with the TEDS-compatible amplifier. - Page 64 *13 Bridge excitation current A current of power supplied to a Wheatstone bridge. Since the current is constant current, if the cable resistance increases, the current and voltage, applied to the transducer, is stable. Changes of cable resistance, due to cable extension, do not affect the voltage applied to the transducer. However, compensate the bridge resistance when the bridge resistance is different from the nominal bridge resistance.
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