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2 CONTENTS Overview.................................................................... 4 Specifications ........................................................... 5 External Name and Dimension ...................... 6 Operation .................................................................. 8 1. Transducer Connection ...................................... 8 2. Zero Point Adjustment ....................................... 9 3. Span Adjustment ............................................... 10 4. Filter Adjustment .............................................. 10 5. Analog Voltage Output ..................................... 11 6. Analog Current Output ................................... 12 7. Remote Connection........................................... 13 8. Power Supply Connection ............................... 14 9. Current Output Adjustment ........................... 14 10. Power Supply Adjustment Applied Sensor 14 11. Amplifier Calibration ..................................... 15 12. RS232C Output(Option) ............................... 16 13. Bridge Module Application(Option) ........... 17 Cautions During Use ......................................... 19 3 4 Overview Functions and Features of Strain Amplifier This amplifier as an amplifier dedicated to the load cell is designed to transmit outputs of various transducers not only in the load cell but also in a strain type of gauges into a type of voltage and current, which can be the most appropriate voltage/current amplifier in the industrial site with the fast response speed during the system processing. - This amplifier can output the voltage and current in various patterns with the serial output at the same time. Feature 1 ■ There is no additional amplifier and transmitter as it is an amplifier dedicated to the load cell. Feature 2 ■ This amplifier as an amplifier dedicated to the load cell is designed to transmit outputs of various transducers not only in the load cell but also in a strain type of gauges into a type of voltage Feature 3 ■ It can carry out the measurement on the dynamic characteristics of sensors (dynamic max: 10KHz). Feature 4 ■ It has various patterns of output features. (Voltage 0~5V, 1~5V, 0~10V, current 0~20mA, 4~20mA, 0~40mA, Digital Output RS232C ) Feature 5 ■ It can carry out the strain stress measurement under the bridge configuration in various patterns. Feature 6 ■ It is made in a panel type of structure for the easy installlation. 5 6 Specifications Input Sensitivity Voltage Output Current Output (Option) Digital Output (Option) Strain (Option) Full Bridge Transducer Strain Gage Type Input Output 0~+/-10V 0~40mA 0~+/-10V, RS232C DC +18~+24V Power Supply 100mA or higher x1, x10, x100, x1000 x1, x10, x100, x1000 x1, x10, x100, x1000 Gain x1~x11(Fine) x1~x11(Fine) x1~x11(Fine) (1~11,000 Load Cell Load Cell Load Cell times) 0.1mv/V~100 mv/V 0.1mv/V~100 mv/V 0.1mv/V~100 mv/V Low-pass filter Low-pass active filter Low-pass filter 1Hz, 10Hz, 100Hz, 1Hz, 10Hz, 100Hz, 1Hz, 10Hz, 100Hz, Low-pass Filter 1KHz, 10KHz 1KHz, 10KHz 1KHz, 10KHz Optional Optional Optional Input ≤1010Ω ≤1010Ω ≤1010Ω impedance Power supply 2V, 5V, 10V Optional 2V, 5V, 10V Optional 2V, 5V, 10V Optional applied to (Remote Sense) (Remote Sense) (Remote Sense) sensor Zero Point ±100% (R.O) ±100% (R.O) ±100% (R.O) Balance Gain Balance ±10% (R.O) ±10% (R.O) ±10% (R.O) Straightness ±0.01% (F.S) ±0.01% (F.S) ±0.01% (F.S) Accuracy Scope of working temperature Load Impedance ±0.01% (F.S) ±0.01% (F.S) ±0.01% (F.S) -25~+85℃, 85% -25~+85℃, 85% -25~+85℃, 85% 1.7KΩ < 0~500Ω 3KΩ ~ 7KΩ 9600bps, Stream Mode 16bit, 8Hz Sampling Rate Rs232C 7 1/4, half, full (50Ω~1KΩ) Transducer Strain gage type sensor Input sensor Resistor type displacement sensor Dcdt displacement sensor Various displacement transducer External Name and Dimension External Name ⓐ: LED for power supply indication ⓑ: LED[-BAL,+BAL] for output direction indication ⓒ: Zero point adjustment volume [Coarse, Fine] ⓓ: Fine span adjustment volume [x1~x11][Coarse, Fine] ⓔ: Dip switch for gain adjustment [x1, x10, x100, x1000] ⓕ: Dip switch for filter adjustment [1Hz,10Hz,100Hz,1KHz,10KHz] ⓖ: Dip switch for other adjustments [350ohm bridge calibration, REM: applied power supply in remote, EXC: power supply applied to sensors] ⓗ: Sensor input terminal ⓘ: Voltage / current / RS232C output terminal ⓙ: Input voltage terminal ⓚ: Ground terminal 8 External Dimension 9 Operations 1. Tranducer Connection This amplifier should be connected to the transducer with the shield cable. Connection should be done carefully for colors if the polarity of input and output line is expressed in colors by the maker. Maker EX+ EX- S+ S- SHIELD CAS Red White Green Blue Black KYOWA Red Black Green White Cover SHINKOH Red White Green Blue Cover BLH Green Black White Red Cover 10 2. Zeor Point Adjustment 1. Carry out warm-up for 30 minutes after the applied power supply and transducer are connected. 2. Use D.V.M or an indicator for the connection with the output from the amplifier. 3. Use a screwdriver to adjust the zero volume to indicate 0.000 V or 0.00 mA (for the current transmission. At this time, use the coarse volume for the zero point adjustment in a large unit and fine volume for the fine adjustment. [At this time, the output is zero if -BAL,+BAL LED are turned off or on at the same time.] 4. If 0.000 V is not indicated although the zero volume is turned to the end, it is possible for the transducer to have any problem or the initial load is applied. In such a circumstance, adjust the zero balance by applying the additional resistor to the transducer or inquiry of the transducer maker about the scope of zero point. 5. Check out if the transducer is defective or the terminal connection is wrong, when the display value does not change although the zero volume is turned. 11 3. Span adjustment 1. The transducer shall be under the initial zero condition before the start of span adjustment. 2. Adjust the gain to display the desired value by applying the known actual weight or load. For example, assume a load cell with the rated output of 3mV/V and rated weight of 220Kg. Add the maximum weight 200Kg and adjust the span volume to display 10.000 V if the characteristic of input and output for the voltage transmitter is 3 mV/V, 0~10 V at this time. The same principle shall be applied to the transmission of current. (Set how much the span should be first to make the output of 3mV/V become 10V Span (G)= 10V (output voltage) / 0.030V (maximum output voltage in the sensor if 10V is applied) = 333.3 times Set the dip switch on the amplifier’s front panel to x100. And then make adjustments with the zero point volume and span volume.) 3. Check out the zero point again after removing the weight or load. Repeat the aforesaid steps after setting the zero point if it is not set right. 4. Filter Adjustment 1. Use it in a place with many noises or to remove any unnecessary frequency. Stabilize the output signal by adjusting the LPF dip switch on the front panel. 2. Adjust the dip switch to make adjustment respectively for 1Hz, 10Hz, 100Hz, 1KHz, 10KHz. 12 5. Analog Voltage Output This amplifier can output various patterns of voltage to be used with the connection to the input end of a recorder, oscilloscope or A/D board among others with the easy use for the secondary transducer or control input. The analog output voltage is diverse by model with the maximum output up to 10V. The connection can be done by using a screwdriver in the terminal on the amplifier back to make the connection to the terminal voltage output (Vout) and output GND terminal, respectively. 13 6. Analog Current Output This amplifier can output various patterns of current and the current input measuring equipment should be applied to the equipment for the receiving side of current in any case. If the measurement is done with a general D.V.M indicator, the measurement shall be done by applying a load resistor as shown in the picture and making conversion in voltage. The analog current output is diverse by model with the maximum output up to 40mA. Ex) I = 4mA, R=250Ω ⇒ VR = 4mA x 250Ω = 1 V I = 20mA, R=250Ω ⇒ VR = 20mA x 250Ω = 5 V 14 7. Remote Connection There occurs the loss of power supply applied to the sensor from the occurrence of resistance due to the cable length if the sensor is distant. The power supply with the static voltage can be done stably to the sensor if the remote function is used. Turn off the “REM” dip switch on the amplifier front for operations (basically 4-line type for the power supply with the internal static voltage if it is turned on), after the connection is done to the terminal for the input terminal remote as shown in the picture above. 15 8. Power Supply Connection As this amplifier is operating with the power supply in the voltage with a single power of DC +18V ~ +24V (100mA or higher), attention should be paid to the fact that the product can be under the excessive load, if the voltage is lower or higher. DC+18~24V 9. Current Output Adjustment The current converter built in LCT PRO can be adjusted as follows; If the voltage output is 0V, the current becomes 0mA. If the voltage output is 10V, the current automatically outputs 40mA. For example, if you want to get the current in 4 ~ 20mA, it is converted to the current of 4mA if the voltage current is set to the zero point and automatically 20mA if it is set to the span voltage of 5V. Output of 0V ~ 10V: current output is 0mA ~ 40mA Output of 0V ~ 5V: current output 0mA ~ 20mA Output of 1V ~ 5V: current output 4mA ~ 20mA Output of 1V ~ 10V: current output 4mA ~ 40mA 10. Adjustment of Power Supply Applied to Sensor The power supply applied to the sensor can be selected in this amplifier. Adjust the dip switch in AUX on the amplifier panel to change the voltage applied to the sensor respectively in 2V, 5V or 10V. 1. 2V is used for the applied power supply: Use a 1/4 or 1/2 bridge type and low impedance gage (120/350ohm) for the measurement. (Prevent the gage from any heating). 2. 5V is used for the applied power supply: There are benefits from the installation of many load cells. The stable measurement can be done due to the less heating in the circuit. In addition, it would be better off if the applied power supply is as low as possible as the temperature drift and the initial warm-up time become longer when any highly applied power supply is given to the load cell with the small heatsink. 3. 10V is used for the applied power supply: It is good if one load cell is installed. The load cell with the great heatsink can also be used. In addition, there are advantages good for the characteristics of 16 frequency response as it is not necessary to increase the span in the amplifier. However, the time for the stabilization in the heat should be given. 11. Amplifier Calibration This amplifier can set up the gain for the amplifier using a 350Ω load cell. The gain of the amplifier can be calibrated with the resistor for calibration inside it. The sequence is as follows; 1. Set the zero point to 0V under the zero point condition in the load cell. 2. Turn on the CAL dip switch on the amplifier front panel. 3. Set the gain in the amplifier to x 1,000 at this time. 4. Turn the Span volume to adjust it on the amplifier front panel until it becomes 2.923V. 5. Refer to the following table as the span value differs when the power supply applied to the sensor is supplied with 2V, 5V or 10V Power applied to the sensor 2V Output setting value 5V 2.923V Gain adjustment Gain x1000, Coarse/Fine Span Gain x100, Coarse/Fine Span 10V Gain x100, Coarse/Fine Span 17 12. RS232C Output (option] Output data to voltage can be obtained using a RS232C port in a computer with this amplifier. Set the defined RS232C attributes for use after the connection as shown in the following picture. Baudrate : 9600, DataBits : 8bit, Parity : None, Stop Bits : 1 Bit PC protocol (11bytes), Stream mode [continuous transmission is done in 0.1 second interval when the power supply is applied] [SIGN][DATA][UNIT][CR][LF] [SIGN] : sign. '+', '-' [UNIT] : unit. 'V' [DATA] : voltage. "xx.xxxx" (7digits including a decimal point) [CR] : Carriage Return. <0x0d> [LF] : Line Feed. <0x0a> 18 The picture above shows an example using Hyperterminal in a PC. 13. Bridge Module Application (option] The strain measure can be done respectively with quarter, half and full bridge configuration using 120Ω, 350Ω or1KΩ strain gage if a separate bridge module is connected. The connection can be done as follows; Ex) Connection for a 120Ω 1/4 gage 1. Connect the bridge module to the sensor input end on the back of this amplifier as shown in the following picture using a “-“ screwdriver. 2. Connect the gage to be used to the bridge module. 3. Adjust the applied power supply by setting the dip switch on the amplifier front panel to 2V. 4. Set the gain to x1,000. 5. Carry out the zero point adjustment. [set to 0.000V] 6. Turn the span volume to set to “1.001V" while the CAL dip switch (Shunt Cal.) is being turned on. “1.001”V becomes “1,001”ue at this time. The Shunt Cal value becomes “2.923V” “2,923ue” if a 350Ω gage is used. (G.F=2) 7. Carry out the measurement if the zero point adjustment is unnecessary after turning off the Cal switch. 19 Using a 120Ω strain gage (Quarter) Using a 120Ω/350Ω strain gage (Half) * Remove the bridge module and connect it for your use if a full bridge is used. 20 Cautions during Use This amplifier is a precise electronic circuit module. The followng cautions should be exerted during your use. 1. Apply the voltage according to specifications. 2. Be careful not to apply any reverse voltage when you apply the voltage. 3. Be careful not to apply any power supply to the analog output terminal and transducer input terminal. 4. Do not use it to the input terminal for the current meter device during the voltage output. 5. Use the product within temperature and humidity as shown in the specifications. 6. Be careful to avoid any use with vibrations or mechanical impacts while avoiding any drop. 7. Be careful fo the wireing during the transducer connection. 8. Do not exert any excessive force during the zero point or gain adjustment. 9. Use a '-' screwdriver while avoiding any excessive force during the zero point or gain adjustment. 21 MEMO 22 MEMO 23 24