Download LCT_PRO_ENG_UM.

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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
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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.
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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
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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
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External Dimension
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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
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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.
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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.
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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.
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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
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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.
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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
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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
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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>
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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.
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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.
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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.
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MEMO
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MEMO
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