Design of Frequency Conversion Water Supply Control System of Sewage Disposal Based on Modbus

After survey and analysis of recent water supply system,the frequency conversion constant pressure water supply system with Modbus communication was designed.The system adopts frequency conversion speed regulating measure to adjust rotating speed of the motors of water pumps,and to keep continuous flow adjustment.Moreover,PID algorithm is introduced to realize variable speed control and ensure dynamic balance between water supply and water consumption,which has saved energy effectively.Furthermore,configuration software is applied for remote surveillance and remote control.The result of practical operation on site shows that the system features have excellent expandability,flexibility and dependability.