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Control Devices for Metering and Batching Equipment
BV-02 Weighing Module
BV-02 weighing module is aimed for discontinuous batching and static weighing within truck, railroad and platform scales.
Operation Features
- Generating highly stable alternating supply voltage for two metering channel, each of them can include from 1 to 4 strain sensors
- Signal smoothing (filtration) of each channel within ranges to be setup
- Setting up function of digital inputs/outputs (zero, tare, weighing, operation, weight change)
- Selecting active input/output levels
- Displaying state and operation of CAN, RS-232 interfaces and state of discrete outputs
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Examples of BV-02 Application
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Basic Features
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Relative error in weight metering out of the maximum weighing limit (NPV), %
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±0.02
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Power supply from direct current source, V
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from 18 to 36
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Power demand, W
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up to 10
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Ambient temperature, ºС
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from -40 to +50
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Class of dust and moisture protection
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IP20
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BV-02 Performs the Following Functions as per In-Built Algorithm:
- Receiving signal from each metering channel and its conversion by 24-bit AD converter
- Signal linearization for each metering channel
- Zero setting and scales tare offset
- Automatic calibration
- Calibration of signal for each metering channel
- Metering weight independent for each channel
- Transfer of processed data from strain sensor, digital inputs and outputs to the upper level device through CAN interface by Modbus protocol
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Design
BV-02 is designed in OKW casing of RAILTEK serial # B6505115.
BV-02 unit is provided with
- two independent galvanically isolated weight metering channels
- four galvanically isolated discrete inputs (two for each channel)
- four galvanically isolated digital outputs (two for each channel)
Dimensions of unit BV-02: 157mm х 86mm х 58.5mm (width, height, depth)
Weight of BV-02 unit without package: 0.3 kg
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Operation Limits
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Feature
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Acceptable value
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Min
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Nom
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Max
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General Features
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Ambient temperature, °С
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-40
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-
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+50
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Air pressure, kPa
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84
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-
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107
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Relative humidity, %
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35
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-
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95
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Parameters of Digital Inputs
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Low-level voltage, V
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0
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-
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6
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- logical one level, V
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12
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-
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30
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Parameters of Digital Outputs
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Incoming AC voltage, V
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-
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-
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60
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Commutated direct / alternating current, A
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-
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-
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0.5
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Parameters of Analogue Strain Metering Channel
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Number of metering channels, ea
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-
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-
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2
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Load resistance (from 1 to 4 sensors connected in parallel), Ohm
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95
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380
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-
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- input voltage, V
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-6
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-
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6
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Parameters of Output Analogue Signal
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Output amperage, mA
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4
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-
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20
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