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Control Devices for Metering and Batching Equipment

SD-02 Control System

SD-02 control system within a continuous weighing batcher  is aimed at providing volumemetric and gravimetric batching of bulk and fluid materials as per setup metrological parameters.

Operation Features

Basic Parameters for SD-02 Control System within Continuous Weighing Batcher

 Limits of permissible error for batchers as per maximum
performance provided that the batcher operates continuously for at least 6 minutes

 ±0.5 

 Supply voltage of monophase alternate current with frequency 50.0±0.5, V  

 from 187 to 242

 Power demand, W, not exceeding

 50 

 Ambient temperature, ºС

from -10 to +35

 Dust-proof-and-moisture-proof class of the cabinet (as requested)

IP54 (IP65)

SD-02 System Provides the Following Functions:

  • Manual charge of hopper batchers up to upper lever with batcher actuators stopped
  • Charging hopper batchers with preset capacity
  • Viewing archives for hour, shift, total run
  • Receipt and processing of signals from strain sensors and control of batching device actuators for bulk and fluid material batching through gravimetric and volumetric methods basing on processed data
  • Control of several batching devices simultaneously basing on Customer's requirements
  • Receipt and processing of digital signals on the motor of agitator and discharge units being ready
  • Generating digital signals for control of an agitator, dumping device, for SD-02 control system being ready for operation
  • Exchanging data with the upper level computer through interface CAN, RS-485 (Modbus RTU data exchange protocol)

Design

SD-02 is a modular unit allowing to configure the system as per specific needs of certain equipment for PCS and to be installed into a cabinet. The class of dust and moisture protection of the cabinet is not lower than IP43.

Operation Features

Feature

Acceptable value

Min

Nom

Max

Features Provided within a Continuous Weigh Hopper

 Maximum performance depending on batcher design, t/h

 0.1 

 - 

 10.0 

 Minimum performance out of NPP, %

 10 

 - 

 - 

Climatic Variables 

 Air pressure, kPa

 84 

 - 

 107 

 Relative humidity, %

 30 

 - 

 80 

Parameters of Digital Inputs 

 Low-level voltage, V

 0 

 - 

 8 

         - logical one level, V

 16 

 - 

 30 

 Duration of input signal, ms

 50 

 - 

 - 

Parameters of Digital Outputs 

 Switching voltage, V

 - 

 - 

 30 

 Load current, A

 - 

 - 

 0.5 

Parameters of Analogue Strain Metering Channel

 Load resistance (from 1 to 4 sensors connected in parallel), Ohm

 95 

 380 

 - 

 Output voltage for sensor feeding, V

 ±5.7 

 ±6.0 

 ±6.3 

Batcher Operation Principle

where P - quantity of materials in the bin

Components of SD-02 Control System

SD-02 Schematic Block Diagram