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As China's social and economic development, the continuous improvement of people's living standard, urban construction developed rapidly, but also the construction of infrastructure on a higher demand. The construction of urban water supply system is an important aspect of water supply reliability, stability, economy directly affect the user's normal work and life, but also directly reflects the level of water supply management.
The need for the water supply system to reduce pump power consumption and maintenance costs and other issues, the design of residential life as an example of the constant pressure water supply system was designed based on inverter, PLC, and the constant pressure water supply pressure sensor system. In this system, PLC will set the value of the pressure measurement error by the PID control after computing the volume of the role of the inverter, which pumps through the inverter speed control network regulating the pressure of constant pressure water supply to achieve the purpose of .
This paper introduces the basic principles of constant pressure water supply system constitutes the basis, as well as on the programmable logic controller (PLC) in the constant pressure water supply system in the role. From the system's overall design and analysis of the actual needs of the beginning, close links the needs of real life, and strive to make sure that the system is running stable, easy to operate, to solve real problems, and ensure the water supply safe, efficient and reliable. Constant pressure water supply to ensure the quality of the water supply to PLC control system for a rich host of control functions of the system to improve the reliability of the system.
Keywords: constant pressure water supply; PLC; inverter

This article introduced the constant pressure water supply's basic principle as well as the system constitution's foundation, showed the programmable controller (PLC) the role which holds the post in the constant pressure water supply system. Start from system's overall design plan and the energy demand analysis, the close relation practical life's need, makes every effort to achieve causes the systems operation to be stable, the operation is simple, the solution real issue, the guarantee water supply security, is quick, is reliable. The constant pressure water supply had guaranteed the water supply quality, as main engine's control system has enriched system's control function take PLC, enhanced system's reliability.

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As China's social and economic development, the continuous improvement of people's living standard, urban construction developed rapidly, but also the construction of infrastructure on a higher demand. The construction of urban water supply system is an important aspect of water supply reliability, stability, economy directly affect the user's normal work and life, but also directly reflects the level of water supply management.
The need for the water supply system to reduce pump power consumption and maintenance costs and other issues, the design of residential life as an example of the constant pressure water supply system was designed based on inverter, PLC, and the constant pressure water supply pressure sensor system. In this system, PLC will set the value of the pressure measurement error by the PID control after computing the volume of the role of the inverter, which pumps through the inverter speed control network regulating the pressure of constant pressure water supply to achieve the purpose of .
This paper introduces the basic principles of constant pressure water supply system constitutes the basis, as well as on the programmable logic PLC in the constant pressure water supply system in the role. From the system's overall design and analysis of the actual needs of the beginning, close links the needs of real life, and strive to make sure that the system is running stable, easy to operate, to solve real problems, and ensure the water supply safe, efficient and reliable. Constant pressure water supply to ensure the quality of the water supply to PLC control system for a rich host of control functions of the system to improve the reliability of the system

With China's social and economic development, the improvement of people's living standard, the urban construction, developing very rapidly, and also for infrastructure construction and puts forward a higher request. The construction of urban water supply system is one of the important aspects of water supply, the reliability and stability and economy directly affects the normal work and life of the user, also directly reflects the supply management level.
For water supply system to reduce the energy consumption and maintenance cost, water pump, the design of the residential district with constant pressure water supply system, for example, a method based on PLC and inverter, the constant pressure water supply pressure sensor system. In this system, the PLC and the measured value will pressure the PID arithmetic value deviation of control effect to the inverter, and through the speed regulation control pump frequency of pressure pipeline, realize the goal of constant pressure water supply.
The paper introduces the basic principle of constant pressure water supply system, and illustrates the programmable logic controller (PLC) in the constant pressure water supply system in the role. From the overall design scheme of system and the actual requirement analysis, closely linked to the actual life, make the system runs stably, simple operation, and solve practical problems, ensure the safe supply, fast and reliable. Constant pressure water supply, water quality to guarantee for the host of PLC control system, the control system was rich function, improve the reliability of system.