摘要:本论文分析变频恒压供水的原理及系统的组成结构,通过研究和比较,本论文采用变频器和PLC实现恒压供水,对系统的硬件设计进行了详细的介绍,然后用数字PID对系统中的恒压控制进行设计。恒压供水系统的基本控制策略是:采用电动机调速装置与可编程控制器(PLC)构成控制系统,完成供水压力的恒定控制,使管网流量变化达到稳定供水压力的目的。系统设定的给水压力值与反馈的总管压力实际值进行比较,其差值输入PLC运算处理后,发出控制指令,控制电动机的转速,从而达到给水总管压力稳定在设定的压力值上。8815
关键字:变频调速;恒压供水;PLC
Abstract:This paper analyzes the structure of VF speed regulating constant-pressure water supply and proposes several control methods. By careful study and comparison, PLC and inverter's method fits water supply system very well. Finally the paper shows the design of constant pressure supply water controller according to PID data and detailed introduction of its software and hardware. In this paper, Water Supply System of the basic control strategy is: The motor drive device and the programmable logic controller (PLC) control system constitute a complete water pressure constant control to achieve stable flow change pipe water pressure purposes. Water supply system set pressure, and the feedback of the mains pressure to compare the actual value, the difference between the input transducer operation processing, the issue control instructions to control the motor speed, so as to achieve stable water supply mains pressure to the pressure value on the set.
Key word: Speed-frequency variable,Constant pressure water supply,PLC
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