PLC太阳能热水器自动控制系统.doc

PLC太阳能热水器自动控制系统
摘要
本课题研究了可编程控制器(PLC)在太阳能热水器自动控制系统中的应用。重点研究了系统的硬件构成及系统软件的设计过程。指出了 PLC 设计的关键主要是能满足基本控制功能, 并考虑维护的方便性、系统可扩展性等。在本文中经研究确定出了系统的各个工序,绘制了系统的工艺流程图;进行了系统的I/O分配和PLC的选型;根据系统设计要求设计绘制了系统的控制梯形图;绘制出了控制系统电气原理图和接线图等。
通过用PLC对太阳能热水器自动控制系统的改造,大大减少了系统对其它元器件的使用,使系统接线简单、检修维护方便快捷、可靠性提高,增进了系统的先进性。
关键词: PLC;太阳能;自动控制系统;热水器
目录
PLC太阳能热水器自动控制系统················································1
摘要·······································································1
前言·······································································2
第一章太阳能热水器介绍····················································3
国内外研究现状······················································3
目前我国太阳能热水器的种类··········································4
二、可编程控制器简介·······················································8
PLC的发展过程·······················································8
可编程序控制器的工作原理············································9
可编程控制器的的特点··················································9
PLC的分类··························································10
可编程控制器应用领域···············································11
三、全玻璃真空管式太阳能热水器的综述······································13
太阳能热水器组成、原理和工作过程····································13
太阳能热水器各单元介绍··············································14
四、热水器控制系统的设计方案·············································16
系统的要求·························································16
系统的设计方案·····················································16
结束语····································································25
参考文献··································································26
前言
用太阳能解决我国家庭热水是最有希望的、最有效可行的途径。太阳能光热应用市场前景广阔,除家庭用热水外,还可用于工业热水、采暖、空调、干燥、农业种植、水产养殖、海水淡化等领域。在此基础上设计出了全玻璃真空管式热水器的自动控制系统。
在电子技术飞速发展的今天,有必要而且有可能采用新技术对原电气控制系统进行改造,以提高可靠性,并实现系统的自动控制,提高太阳能热水器稳定性。可编程控制器由于可提供使用的时间继电器和中间继电器相当多,而且其常开常闭触点可多次重复使用,使得我们在编程中可以随心所欲。用内部编程“软元件”取代继电器逻辑控制电路中大量的时间继电器和中间继电器,简化控制线路、有效提高系统的可靠性,是PLC的突出特点。
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