| |
|
|
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
|
Basic Features of SD-03 Control System within Discontinuous Weighing Hopper
|
Accuracy class as per GOST 10223
|
0.5; 1
|
|
Supply voltage of monophase alternate current with frequency 50±0.5 , V
|
from 187 to 242
|
|
Power demand, W, not more
|
50
|
|
Ambient temperature, ºС
|
from +5 to +40
|
|
Dust-proof-and-moisture-proof class (as requested)
|
IP54 (IP65)
|
|
|
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
|
|
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.
|
|
Operation Features
|
Feature
|
Acceptable value
|
|
Min
|
Nom
|
Max
|
|
Features Provided Being a Part of Discontinuous Weigh Hopper
|
|
Maximum performance depending on batcher design, t
|
0.1
|
-
|
630.0
|
|
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
|
|
Parameters of Output Analogue Signal
|
|
|
|
|
Output amperage, mA
|
4
|
-
|
20
|
|
|
Operation Chart for Discontinuous Weigh Batcher
|
|
where P - value of weight in hopper, t
|
|
Components of SD-03 Control System
SD-03 Schematic Block Diagram
|
|
|
|
|
|