Design of Double Constant-pressure Supplying Water Control System Based on PLC

This water supply system under constant pressure designs a suit of PLC controlling system based on variable frequency speed-regulating technology. The system consists of pressure sensors, transducer, pumps, relays, contacts device and so on. In this system, by comparing the setting value and measuring value of pressure, the deviation is obtained. Then the control volume is obtained by the PID operation to affect the transducer. Thus the pump rotational speed is controlled through transducer to adjust the pressure of the pipe network and realize the constant pressure water supply goal.