Abstract: With the rapid development of power electronics technology, the functions of frequency converters are becoming increasingly powerful. Fully utilizing the various built-in functions of frequency converters is of great significance for the rational design of variable frequency speed-regulating constant pressure water supply equipment, cost reduction, and ensuring product quality. Keywords : Frequency converter, control function. Compared with the past water tower or elevated water tank and pneumatic water supply methods, the new water supply method has unparalleled advantages in terms of equipment investment, operational economy, system stability, reliability, and automation, and also has significant energy-saving effects. These advantages of the constant pressure water supply speed regulation system have attracted the attention of almost all domestic water supply equipment manufacturers, who are continuously investing in the development and production of this high-tech product. Currently, this product is developing towards high reliability, fully digital microcomputer control, and multi-variety series. Pursuing high intelligence and standardized series is an inevitable trend for future water supply equipment to adapt to the requirements of urban construction, large-scale development of intelligent buildings, network water supply scheduling, and overall planning. 1 Variable Frequency Control Constant Pressure Water Supply Control Method As is well known, the power consumption of a water pump is proportional to the cube of its speed. That is, N = Kn³. In this formula, N is the power consumption of the water pump, n is the speed of the water pump during operation, and K is the proportional coefficient. While the water pump is designed for operation at industrial frequency, the flow rate is relatively low most of the time, except during peak hours. Because variable frequency technology and microcomputer control are used, the pump speed can be adjusted according to the flow rate, ultimately achieving energy savings. Practice has shown that using variable frequency equipment can reduce the average pump speed by 20% compared to industrial frequency, thus significantly reducing energy consumption. Energy savings can reach 20%-40%. Currently, the electrical control cabinets for water supply equipment produced by various domestic manufacturers, besides using outdated relay contactor control methods, generally fall into four categories: 1. Logic electronic circuit control method This type of control circuit makes it difficult to achieve full soft start and full flow variable frequency regulation for the entire pump unit. Often, one pump is fixed in variable frequency mode, while the rest are in industrial frequency mode. Therefore, it has lower control precision, larger water pressure fluctuations during pump switching, more complicated debugging, impact during start-up of the fixed-frequency pump, and weaker anti-interference capability, but it is also cheaper. [b][align=center]For more details, please click: A Brief Discussion on the Application of Computer-Dedicated Constant Pressure Water Supply Inverters[/align][/b]