PLC在恒压给水系统中的应用.doc

摘要

随着社会主义市场经济的发展，人们对供水质量和供水系统可靠性的要求不
断提高；再加上目前能源紧缺，利用先进的自动化技术、控制技术以及通讯技术，
设计高性能、高节能、能适应不同领域的恒压供水系统成为必然的趋势
本论文分析恒压给水系统的原理和结构，设计不同方案，综合各方面考虑，
本论文采用变频器和 PLC 实现恒压供水和数据传输，然后用数字 PID 对系统中的
恒压控制进行设计。最后对系统的软硬件设计进行了详细的介绍。具体讲述了系
统的总体设计与软件的实现，并对系统采取的可靠性措施进行了说明。

关键词 变频调速，恒压供水，PLC

ABSTRACT

With the rapid development of socialistic marketing economy,there is a growing demand
for better quality of water supply and higher reliability of supply system. In addition ,considering the current common energy crisis, achieving the scheme of auto matingthe water supply system. So it is an inevitable tendency to design and create an energy-saving constant-pressure water supply system of excellent performance with the help of advanced techniques of automation,monitor-control system; and communication. Meanwhile, the System can also adapt to various water Supply regions.
This paper analyzes the structure of VF speed regulating constant-pressure water supply,and proposes several control methods.By careful study and comparison, PLC and inverter's method fits water supply system and datatrans mission very well. Finally the paper shows the design of constant pressure supply water controller according to PID data and detailed introduction of its software and hardware.In this paper,the author designs and realizes the remote monitor and control system through MCGS, and then illustrates its general design, software implement and the measures of preventable disturbance in details.

Key words VF speed，constant pressure water supply，PLC

目 录

摘 要 .............................................................................................................................................................. I
ABSTRACT ......................................................................................................................................................II

1 绪论......................................................................................................................................................... 1
1.1 城市供水系统的要求..................................................................................................................... 1
1.2 变频恒压供水的背景和意义......................................................................................................... 3 1.3 国内外研究概况............................................................................................................................. 3
2 恒压给水系统简介 ............................................................................................................................. 5
2.1 变频恒压供水系统.......................................................................................................................... 5 2.2 课题研究的对象............................................................................................................................. 6 2.3 恒压供水系统控制方式介绍.......................................................................................................... 6 2.4 变频构成恒压供水系统的及工作原理......................................................................................... 6
2.4.1 系统的构成......................................................................................................................... 6 2.4.2 工作原理............................................................................................................................. 7 2.4.3 变频恒压供水系统中增减水泵过程分析 ......................................................................... 8
2.5 主电路接线图................................................................................................................................. 9 3 恒压供水系统硬件配置 .................................................................................................................. 10
3.1 可编程控制器选型....................................................................................................................... 10
3.1.1 简介 PLC............................................................................................................................. 10 3.1.2 PLC 的选型.........................................................................................................................11 3.1.3 PLC 的接线........................................................................................................................ 12
3.2 变频器选型................................................................................................................................... 13
3.2.1 变频器简介........................................................................................................................ 13 3.2.2 变频器的选型................................................................................................................... 14
3.3 压力传感器选型........................................................................................................................... 14 3.4 原件表............................................................................................................................................ 15
4 恒压供水系统程序与仿真................................................................................................................ 17
4.1 恒压供水系统流程图................................................................................................................... 17
4.2 恒压供水系统程序与仿真......................................................................................................... 19
4.2.1 手动程序设计与仿真 ....................................................................................................... 19 4.2.2 自动程序设计与仿真 ....................................................................................................... 22
结论.............................................................................................................................................................. 33
参考文献 .................................................................................................................................................... 34