LM系列PLC在恒压频比变频供水系统中的应用

Application of LM Series PLC in the Water Supply System of Constant Pressure and Frequency Conversion

本文介绍了HOLLiAS LM系列小型PLC(以下简称LM)在恒压变频供水系统上的应用。系统可根据管网用水需求自动实现3台泵的投切转换和工频/变频转换,并可根据储水罐压力以PID方式自动调节泵的运行频率。满足节能节水的环保理念。

This article describes the application of small PLC of HOLLiAS LM series （Abbreviation, LM） in the water supply system of constant pressure and frequency conversion, The system can automatically realize the switching and power frequency/variable frequency conversion of three sets of pump according to the demanding of water supply network. Apart from this, the system can also automatically adjust the operating frequency of the pump under the storage tank pressure by using PID control. All that has been done will meet the environmental protection concept of saving energy and water.