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Control Devices for Metering and Batching Equipment
SD-03 Control System
SD-03 control system within discontinuous weighing hopper is aimed for weighing specified batches of bulk and fluid materials as per certain metrological parameters.
Operation Features
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Basic Features of SD-03 Control System within Discontinuous Weighing Hopper
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Accuracy class as per GOST 10223
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0.5; 1
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Supply voltage of monophase alternate current with frequency 50±0.5 , V
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from 187 to 242
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Power demand, W, not more
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50
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Ambient temperature, ºС
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from +5 to +40
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Dust-proof-and-moisture-proof class (as requested)
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IP54 (IP65)
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SD-03 performs the following functions as per in-built algorithm:
- Processing input signals from strain sensors and generating control signals for feeder actuator, hopper vibrating device and gate
- Loading weighing hopper in an automatic mode upon the instruction from data exchange bus till achieving preset dose and generating the signal on the dosage
- Loading weighing hopper in an automatic mode upon the instruction from data exchange bus and generating the signal on the dosage completion
- Charging and discharging of weigh hopper in manual mode by pressing buttons CHARGE, DISCHARGE, keys and indicator BZP-08
- Connection with local PCS through RS-485, CAN 2/0 A/B interfaces (Modbus RTU exchange protocol)
- Transferring following data to computer: current process data, their upper and lower limits, state of alarm and shutdown, trip points and ultimate limits of process parameters
- Nonvolatile keeping of the date and time
- Restoring data when the power is back after emergency cut off
- Control from one to eight discontinuous weighing batchers
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Design
Upon Customer's requirement SD-03 could be located to cabinet or panel. Control and display devices are located at the front panel showing the control of BZP-08 batcher.
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Operation Features
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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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Features Provided Being a Part of Discontinuous Weigh Hopper
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Maximum performance depending on batcher design, t
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0.1
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-
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630.0
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Minimum performance out of NPP, %
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10
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-
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-
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Climatic Variables
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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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30
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-
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80
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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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8
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- logical one level, V
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16
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-
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30
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Duration of input signal, ms
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50
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-
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-
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Parameters of Digital Outputs
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Switching voltage, V
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-
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-
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30
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Load 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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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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Output voltage for sensor feeding, V
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±5.7
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±6.0
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±6.3
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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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Operation Chart for Discontinuous Weigh Batcher
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where P - value of weight in hopper, t
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Components of SD-03 Control System
SD-03 Schematic Block Diagram
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