Abstract : A simple control system with inverter for constant pressure water supply is introduced. This system eliminates the need for a PLC controller, is easy to use, and can automatically maintain constant water pressure to meet water supply requirements. Keywords : inverter; constant pressure water supply; simple control mode 0 Introduction In constant pressure water supply applications, inverters, with their advantages of energy saving, safety, and high-quality water supply, have revolutionized the technological equipment level of China's water supply industry. The constant pressure water supply speed regulation system enables stepless speed regulation of the water pump motor, automatically adjusting the system's operating parameters according to changes in water consumption. It maintains a constant water pressure to meet water demand when consumption fluctuates, making it a relatively advanced, reasonable, and energy-saving water supply system that eliminates secondary pollution of the water tank. The new variable frequency speed regulation constant pressure water supply simplified control system uses the latest VP series frequency converter from Japan. This frequency converter, with only a multi-pump control unit, can directly control multiple water pumps without requiring expensive external PLC controllers and PID regulators, offering powerful functionality at a lower cost. The variable frequency speed regulation constant pressure water supply control circuit, through setting instruction codes, can easily and flexibly implement the functions of PLC, PID, and other control systems, simplifying the circuit structure and improving system reliability. This significantly reduces equipment costs while achieving the goal of simplified constant pressure water supply control. [b][align=center]For more details, please click: Application of the Variable Frequency Constant Pressure Water Supply Simplified Control System[/align][/b]