Control Devices for Metering and Batching Equipment
SDU Universal Batching Control System
SDU Universal Batching System is aimed to ensure continuous dosing of bulk materials or dosing with specified metrological characteristics being a part of continuous belt or hopper batcher.
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Operation Features
- modular construction concept of the SDU allows to solve variety of tasks by collecting units with the right functions and gives the opportunity of rapid recovery of the SDU through the faulty unit replacement
- onboard construction of the SDU batcher or weights reduces assembling expanses of integrated cable system, increases accuracy of weighting and batching
- bussed link between units gives an opportunity to use units that are not part of the SDU to enhance the functionality
- large set of communication interfaces with upper level allows embedding SDU into existing automation system of the enterprise
- ability to install additional discontinuous units of input and output and direct control with additional VU equipment
- a wireless interface allows automatically join the SDU in a local network without laying connector cables
- ability to control frequency drive by current signal of 4-20 mA or via digital interface RS-485
- operating temperature range from minus 40 to plus 50 °C within the specified accuracy
- full software compatibility with existing control systems based on control system SD-01 gives an opportunity to replace the controllers, at the end of their life time, not only with the minimal cabinet retrofitting, but also with the software expanses
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Basic Features
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Limits of permissible error when material mass metering in the structure of weights or hopper batcher, %
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up to ±0.05
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Limits of permissible error out of the maximum production limit upon condition of continuous work for at least 6 minutes in the batcher, %
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up to ±0.25
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Permissible range of DC voltage, V
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from 18 to 36
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Consumed power depending on modification, W
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from 6 to 30
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Operative range of ambient temperature, °C
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from -40 to +50
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Dust and humid protection as per GOST 14254:
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- onboard version
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IP65
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- cabinet version
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IP54
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Operation mode
- "Automat"- main mode for automated batching or weighting of material, register and transfer of data to the upper level
- "Manual" - turning off control functions by batching or weighting is necessary for manual control of belt motion during the maintenance
- "Check-out" - measurement and control channels set-up, calculation of main parameters of batcher or weights ( for example, maximum speed of the belt, weight measuring system set-up and etc.)
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Hardware Functions
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Parameter
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Acceptable value
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Min
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Normal
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Max
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Mass measurement channel characteristics:
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Analogue-digital transducer resolution, bit
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-
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-
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24
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Range of operating transfer ration, mV/V
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-2.5
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-
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+2.5
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Active load to drive circuit, kOhm
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0.1
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-
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200
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Active load to measurement circuit, kOhm
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0.1
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-
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200
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Number of strain sensors connected in parallel on the same channel, pieces
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1
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-
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4
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Measurement characteristics of channel, number and frequency of impulses:
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Input voltage level to change logical state, V
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8
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-
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36
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Frequency ranges for metered channel, Hz
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0.1
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-
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3000
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Useful current, mА
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-
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-
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10
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Characteristics of digital inputs:
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Input voltage level to change logical state,V
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8
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-
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36
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Useful current, mА
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6
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-
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15
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Characteristics of digital outputs such as "source with ground load":
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Output amperage, mA
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-
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-
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250
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Characteristics of digital outputs such as "dry contact":
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Electric signal power via channels, W
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-
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-
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30
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Maximum permissible commutating voltage,V
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-
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-
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50
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Channel characteristics of output analog signal:
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Analog signal range, mA
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4
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-
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20
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Active resistance load range, Ohm
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100
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-
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500
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Channel characteristics of output analog signalа CAN:
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Data exchange rate, Kbit/s
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-
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-
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600
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Channel characteristics of interface data exchange RS-485:
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Number of controlled frequency converters, pieces
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1
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-
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32
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Maximal rate of data exchange, baud
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4800
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-
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115200
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Channel characteristics of data exchange ProfiBus DP:
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Data exchange rate at segment length, kbit/s
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187.5
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-
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12000
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Number of subscribers in the segment, pieces
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1
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-
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32
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Characteristics of wireless channel of data exchange ZigBee:
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Data exchange distance indoors, m
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-
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-
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100
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Data exchange distance outdoors, m
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-
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-
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1500
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Operating frequency, MHz
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-
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2.4
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-
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Environmental resistance:
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Noise stability to impulse signals of micro and nanoseconds ranges of action time in the power circuit, V
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-
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-
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1000
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Design
Onboard version of SDU is performed in the form of body frame with cable entries and modes switches with modular batching controller inside (KDM).
Onboard SDU is located directly on the design of batcher or weights.
In the cabinet SDU is located on the Din -toothed rack next to batcher(weights) or at a distance of them.
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SDU System Components
Structured schemes of SDU
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