PLC与变频器在恒压供水控制系统中的应用

用PLC与变频器控制的高楼恒压供水系统,采用PLC进行逻辑控制,变频器进行压力调节.PLC与变频器作为系统控制的核心部件,时刻跟踪管内压力与给定压力的偏差变化,经变频器内部PID运算,通过PLC控制变频与工频切换,自动控制水泵投入的台数和电机转速,实现闭环自动调节恒压变量供水,在保持恒压下,达到控制流量的目的.

Applied PLC and inverter to constant pressure water supply system

With PLC and inverter control constant pressure water supply system,high-rise buildings,the use of PLC logic control,the inverter for pressure regulation.PLC control and frequency converter as a core part of the system,keeps track of the tube pressure and the deviation of a given change in pressure,the drive internal PID operation,through the PLC control frequency and the frequency switching,auto-control pump station into the number and the motor speed to achieve closed loop automatically adjusts the consta...