文档介绍：基于PLC的变频调速恒压供水系统
摘要
水乃生命之源,水当今社会是非常重要的,现在的人们都是住在小区里,没一个小区都有供水系统使得人们取水非常方便,但是小区对供水系统的要求也是很苛刻的,本论文就是根据当今社会城市对供水系统的要求,设计了一套基于PLC的变频调速恒速供水系统,本系统包括可编程控制器、压力传感器、水泵机组、工控机、变频器等。
水泵机组由三台水泵电机组成,他们采用变频循环的工作方式。利用变频器来控制水泵电机的软启动和变频调速。利用压力传感器来检测水压,送给PLC,然后与设定值比较,最后进行PID运算,这样来控制变频器的输出电压和频率,最后改变水泵机组的转速,就可以控制供水量。工控机用来与PLC连接。
关键词:变频调速,恒压供水,PLC
Abstract
Water is the source of life, water is very important in today's society, people are now living in the neighborhood, not munity have made people for water supply system is very convenient, but the area required for the water supply system also is very strict, this thesis is according to the requirements of current society city on the water supply system, design a set of variable frequency speed regulation constant speed water supply system based on PLC, this system consists of a programmable controller, pressure sensor, water pump units, industrial control, frequency converter, etc. And use configuration software development management interface.
Pump unit posed of three pumps motors, they adopt frequency conversion circulation way of working. Use frequency converter to control the water pump motor soft start and frequency control of motor speed. Using pressure sensors to detect pressure, send to PLC, and pared with the set value, the PID arithmetic, so to control the output voltage and frequency of the frequency converter, finally change the rotating speed of pump unit, can control the water supply. puter is used to connect to PLC, configuration software monitoring and control system.
目录
摘要 I
Abstract II
1 引言 1
本课题研究的意义 1
变频恒压供水系统介绍 2
变频调速技术的国内外发展与现状 2
变频恒压供水系统介绍 2
对PLC的简单介绍 4
PLC的定义 4
4
传统上的PLC简介 4
2 系统供水的原理介绍及运行方案 5
变频恒压供水系统的理论分析 5
水泵机组供水调节原理 5
5
供水系统的组成及流程图 6
系统控制运行的流程 8
3 系统的硬件设计 8
系统主要硬件设备 8
PLC及其扩展模块的选择和功能 9
变频器的选择和功能 9
水泵机组的选择和功能 9
压力变送器的选择和功能 10
10
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11