基于PLC的恒压供水系统设计.doc

摘要本文主要针对当前供水系统中存在的自动化程度不高、能耗严重、可靠性低的缺点加以研究,设计出一种在这三个方面都有所提高的 PLC 控制的恒压供水系统。恒压变频供水系统是当今应用最广泛的节能型供水系统。本文通过对供水系统运行特征及工作状态的分析,阐述了系统的节能原理,介绍了系统的基本构成及特点。并从实际出发,通过对 PLC ,变频器,离心水泵等原理的介绍,阐述了整个系统实现的理论基础,通过具体编制 PLC 程序,实现了控制要求,较好的满足了工艺要求。本文所做的研究对同类系统的研究和再开发具有一定的参考价值。关键词:变频调速;节能;PLC 控制 Abstra ct In this paper, the water supply system for the current degree of automation that exist in low energy consumption and serious defects of the low reliability of the research, design a kind of three areas in which the PLC has to increase the control of constant pressure water supply system. Constant pressure water supply system frequency is the most widely used energy-efficient water supply system. In this paper, the characteristics of the water supply system operation and analysis of the state on the system's energy-saving principle of the system's basic structure and characteristics. And proceed from reality, through the PLC, frequency converter, the principle of centrifugal water pumps, etc., 2 the whole system on the theoretical basis for the preparation of PLC through specific procedures, to achieve the control requirements, the better to meet the technological requirements. In this paper, the research done on similar systems in the research and further development ofa certain reference value. Keywords : Frequency Control ; Energy Saving ;PLC 热让他目录 ................................................................................................ 1 任务................................................................................................................. 1 工艺要求......................................................................................................... 1 系统的组成和基本工作原理......................................................................... 1 2PLC 概述..................................................................................................................... 3 PLC 组成........................................................................