PLC无塔供水系统的设计.doc

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1、目录中文摘要··········································Ⅰ英文摘要··········································Ⅱ前言第一章课题设计任务及要求·························1§1.1设计主要内容······························1§1.2设计要求··································1§1.3设计主要工作·······················

2、·······1第二章无塔供水系统的介绍·························3§2.1变频调速恒压供水系统简介·················3§2.2变频调速的节能、调速原理··················4第三章无塔供水系统的设计·························6§3.1系统的设计方案论证························6§3.2工艺过程分析······························6§3.3主电路的设计···········

3、···················10§3.4控制柜的设计······························12第四章PLC控制的设计·····························14§4.1PLC的基本组成····························14§4.2可编程控制器的特点及应用··················15§4.3PLC的工作原理····························15§4.4PLC程序的设计················

4、············16§4.5PLC程序的解释····························24第五章器件选择···································27§5.1可编程控制器PLC的选择····················27§5.2变频器的选择······························27§5.3压力传感器的选择··························29§5.4压力调节器的选择·····················

5、·····30§5.4其它器件的选择····························30结论·············································32参考文献········································33致谢·············································34附录·············································35无塔供水系统的设计摘要本

6、论文介绍了恒压供水的基本原理以及系统构成的基础，说明了可编程控制器（PLC）在恒压供水系统中所担任的角色，在分析了供水自动控制系统的发展现状和优点的基础上，结合我国中小城市楼宇供水的现状，从系统的整体设计方案和实际需求分析开始，紧密的联系实际生活的需要，力求做到使系统运行稳定，操作简便，解决实际中问题，保证供水安全、快捷、可靠。基于上述分析设计了一套变频调速技术为基础的恒压供水系统。该系统综合运用了变频调速技术以及自动控制技术，为了提高恒压供水系统的控制精度和可靠性，所以设计中采用三台大功率电机驱动水

7、泵在用水高峰期运行供水，在用水低谷时转化为两台小功率电机驱动水泵运行供水。供水方式为分组控制﹑轮流变频的控制策略。变频恒压供水保证了供水质量，以PLC为主机的控制系统丰富了系统的控制功能，提高了系统的可靠性。因为此设计是基于用水量的变化，所以很可观的节省了水资源。关键词：PLC，恒压供水系统，变频调速，节能ABSTRACTThispaperintroducedtheconstantpressurewatersupplysystemandthebasicprinciplesconstitutetheba

8、sisthattheprogrammablelogiccontroller(PLC)inWaterSupplySystemintherole,theanalysisofwatersupplydevelopmentoftheautomaticcontrolsystemAndonthebasisofmerit,smallandmedium-sizedcitiesinChinawiththestatusofbuildingwatersupply,fromthe