基于PLC的变频调速恒压供水计算机监控系统

The Computer Supervision and Control System of Varying Speed and Constant Pressure Feed Water Based on PLC

介绍了多泵并联变频调速恒压供水计算机监控系统,它采用底层手动控制、中间PLC控制、顶层计算机控制的3级控制结构。PLC控制采用智能算法,只需测定泵的出口压力p0,通过调节变频器频率及备用泵的投入和退出,即可实现管网末端压力pg=p0-KRQ0的恒定。

This paper describes the computer supervision and control system of varying speed and constant pressure for multi-pump parallel feed water based on PLC.Three level structures consist of hand control at the bottom,PLC control in the medium and computer supervision on top.Intelligent algorithm is developed on the PLC.The constant pressure, P_g=P_0-K_RQ_0,of the main pipe end is regulated by varying speed of the inverted pump and starting or stopping the non-inverted pumps,hence measuring the feed-water pump's outlet pressure.