Design of Water-supply System with PLC-based Frequency Conversion Constant Pressure

It introduces a kind of water-supply system with frequency conversion constant pressure. This system is controlled by PLC and frequency converter. It analyzes the application of S7-200 and the principle of process control in the system, gives the detail about the hardware collection and software planning. The system can adjust water flow automatically according to the pressure of pipes, and guarante the constant pressure of the pipes.