利用PLC及单变频器实现中小型水厂恒压供水控制

On the Water-Supply Control with Constant Voltage in Middle or Small Water-Factory by PLC and Single Fnequency Changer

主要介绍西门子PLC-300以及ABB变频器在宣化西水厂恒压供水控制系统中的应用,着重介绍PLC控制系统的配置方案、软件设计思想和程序结构,并介绍如何避开变频器的低效区,保证城市供水.

The article mainly introduces the application of Siemens PLC-300 and ABB frequency changer in the water-supply system with constant voltage of Xuanhua Xi water-factory. And the allocating plan of the PLC controlling system as well as the software design and programme structure are emphasized. It also presents how to avoid the inefficient area of frequency changer so as to ensure urban water-supply.