基于LG系列PLC的校区全自动供水系统设计_自动化专业论文
发布时间：2015-01-22
来源：人大经济论坛
自动化专业论文范文
目 录
摘 要I
ABSTRACTII
目 录III
第一章 绪 论- 1 -
1.1恒压供水问题的提出- 1 -
1.2国内恒压供水系统的现状- 2 -
1.2.1国内恒压供水系统研究状况- 2 -
1.2.2各类供水系统的比较- 3 -
1.3 本课题的总体方案- 4 -
1.3.1系统的总体布局图- 4 -
1.3.2系统的总体方案- 5 -
1.3.3本系统的特点- 5 -
1.4本课题的主要工作- 7 -
第二章 恒压供水系统的原理- 8 -
2.1变频器- 8 -
2.1.1变频器的基本原理- 8 -
2.1.2变频器结构电路图- 9 -
2.1.3变频器的配线- 10 -
2.2软起动- 15 -
2.2.1软起动的基本原理- 15 -
2.2.2常见故障的排除- 15 -
2.3 文本显示器- 16 -
第三章 供水系统的硬件电路设计- 17 -
3.1主要器件选型- 17 -
3.1.1供水泵的选择- 17 -
3.1.2变频器和软起动选型- 17 -
3.2供水系统的电气设计- 17 -
3.2.1恒压供水思路- 17 -
3.2.2强电驱动线路1- 18 -
3.2.3强电驱动线路2- 20 -
3.2.4电动阀控制电路- 21 -
3.2.5 PLC接线图- 21 -
3.2.6控制线路- 23 -
第四章 恒压供水系统软件设计- 25 -
4.1梯形图的基本绘制规则- 25 -
4.2恒压供水系统I/O分配表- 25 -
4.3程序流程图- 28 -
4.4程序编写- 28 -
4.5程序调试- 28 -
总 结30。
致 谢- 31 -
参考文献- 31 -
附录1元器件清单- 33 -
附录2 PLC程序流程图- 34 -
附录3 PLC程序- 38 -
摘 要
建设节约型社会，合理开发、节约利用和有效保护水资源是一项艰巨任务。根据高校用水时间集中，用水量变化较大的特点，分析了校园原供水系统存在成本高，可靠性低，水资源浪费，管网系统待完善的问题。提出以利用自来水水压供水与水泵提水相结合的方式，并配以变频器、软启动器、PLC、微泄露补偿器、压力传感器、液位传感器等不同功能等传感器，根据管网的压力，通过变频器控制水泵的转速，使水管中的压力始终保持在合适的范围。从而可以解决因楼层太高导致压力不足及小流量时能耗大的问题。
另外水泵耗电功率与电机转速的三次方成正比关系，所以水泵调速运行的节能效果非常明显，平均耗电量较通常供水方式节省近四成。结合使用可编程控制器，可实现主泵变频，副泵软启动，具有短路保护、过流保护功能，工作稳定可靠，大大延长了电机的使用寿命。
关键词：恒压变频供水，PLC，压差供水，自动控制
ABSTRACT
Building the conservation-oriented society, the reasonable development, saves and the effective protecting water resources is an arduous task. Be centralized according to the university water used time, the water consumption change major characteristic, analyzed the campus original water supply system existence cost to be high, the reliability was low, the water resources waste, the pipe network system treated the consummation the question. Proposed that draws water the way which using the running water hydraulic pressure water supply and the water pump unifies, and matches by the inverter, the soft starter, PLC, Micro reveals the compensator, the pressure transmitter, the fluid position sensor and so on. according to the network management pressure, controls water pump's rotational speed through the inverter, causes in water pipe's pressure maintains at throughout the appropriate scope, thus may solve the problem which the floor high pressure is too insufficient when small current capacity the energy consumption is big.
Moreover the water pump consumes the electric power and the electrical machinery rotational speed is proportional three cubed the relations, therefore the water pump velocity modulation movement's energy conservation effect is obvious, the average power consumption usual water supply way saves 40%.The union uses the programmable controller, may realize the main pump frequency conversion, the auxiliary pump soft start, has the short circuit protection, the overflow protection function stably, the work reliable, lengthened electrical machinery's service life greatly.
Key words: Constant pressure frequency conversion water supply, PLC, differential pressure water supply, automatic control
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