《基于PLC的城市小区供水综合节能系统的研制设计》.docVIP

基于PLC的城市小区节能供水系统 所在院系： 所学专业： 导师姓名： 完成时间： 摘要 本文介绍了小区恒压供水系统的构成及工作原理,恒压供水的控制策略，分析了典型的恒压供水系统控制方案,阐述了应用该恒压供水系统的经济效益。系统采用变频调速的方式，自动调节水泵电机转速，保持供水压力的恒定，在用水低谷时投入小流量、降低电耗。系统具有节能、工作可靠、自动化程度高等优点，提高了供水质量。系统中运用了PLC，它是一种固态电子装置，利用已存入的程序来控制机器的运行或工艺的工序。PLC 通过输入/输出装置发出控制信号和接受输入信号。由于PLC综合了计算机和自动化技术，所以它发展异常迅猛，大大超过其出现时的技术水平。它不但可以很容易地完成逻辑、顺序、定时、计数、数字运算、数据处理等功能，而且可以通过输入输出接口建立与各类生产机械数字量和模拟量的联系，从而实现生产过程的自动控制。 关键词： 变频调速，恒压供水，PLC可编程序控制器 Design of constant pressure water supply control system Based PLC Abstract:The?composition?and?operational?principle?of?the?district?constant?Pressure water?supply?system?based?on?inverter?in?the?district are introduced. This paper introduces water supply with constant pressure control policy，cross-section analysis water supply with constant pressure system control schematic, expound economic benefit in application water supply with constant pressure system. The system?adopts motors?of?water ?pumps?and?to?keep?the?press?constant.?This ?system? can increases?water?supply?quantity. PLC is a solid state device used to controlmachine motion or process operation by means of a stared program .The PLC sends output control signals and receives input signals through input/out (I/O) devices. PLC design is for bad industrial environmental use. Because of the comprehensive computer and automatic technology， make its developmentchange with each passing day， exceed the engineering level while it appears greatly. It can finish logic，order， timing， count， digital operation，data processing, etc. function very easily，and can establish with all kinds of connection with analog quantity of amount of mechanical figure produced through the input-output interface， thus realize the automatic control of the production process. Keywords: variable frequency and speed regulation， Constant pressure water feeding，PLC Programmable Logic Controller 启动1#电机变频运行 启动 1#电机变频运行 延时8S 延时1S 2#电机变频运行 延时8S 延时1S 3#电机变频运行 启动结束 转换模拟调节 模拟调节正常运行下1#电机是否到50Hz 模拟调节正常运行下2#电机是否到50Hz 1# 电 机 工 频 运 行 2# 电