下载后可任意编辑摘 要本课题讨论了可编程控制器（PLC）与变频器在太阳能热水器控制器中的应用。并详细介绍了太阳能热水器的工作原理、工作过程、系统要求，重点讨论了系统要求中的光辐射探测及循环水泵的控制、水位控制、压力控制、加热控制、防冻控制等。指出了系统的硬件构成及系统软件的设计过程。课题通过选用s7-200型号PLC控制器，通过光辐射探测器检测光照强度来确定循环泵的启动与否，利用温度传感器检测集热器的温度来实现防冻控制，利用水位传感器检测热水箱中的水位高低实现水位控制，利用压力传感器检测管网末端压力值并通过变频器控制水泵运行来实现压力控制，温度传感器检测管网末端的温度从而控制锅炉的启停来实现了加热控制。同时运用了CPU224及两个EM235完成了对系统的控制，并考虑维护的方便性、系统可扩展性等。通过用PLC对太阳能的改造，已经基本实现了系统控制的各个要求，大大减少了系统对其它元器件的使用，从而使系统接线简单、检修维护方便快捷、可靠性提高，增进了系统的先进性，大大减少了制造成本，可以使更多的用户使用太阳能热水器。关键词: PLC；太阳能；变频器；热水器；自动控制系统下载后可任意编辑AbstractThis subject research of the programmable controller (PLC) and frequency converter in the application of solar energy water heater. And introduces the working principle of solar energy water heater, process and system requirements, focus on the system hardware structure and software design of the system process. Points out the key design is mainly PLC can meet the basic control function.The article, through selecting s7-200 PLC and use CPU224 model and two EM235 completion of the system control, and consider the maintenance convenience, system scalability, etc. In this paper in the system to determine the research of each working procedure, to draw the system; the process flow diagram. The system I/O and soft components distribution, PLC, frequency converter and the various sensors selection of type selection and parameter design; According to the system design requirements of ...
