毕业设计《变频恒压楼宇供水系统的设计》.rar

包括论文，cad图纸，外文翻译

摘要
    本论文根据中国城市小区的供水要求，设计了基于PLC的变频恒压供水系统，并利用组态软件开发良好的运行管理界面，恒压变频供水系统主要有可编程控制器，变频器，水泵机组、压力传感器等组成。PLC的程序编制，调试和运行监控，人机界面的组态均在Step/Micro编程环境下完成。
　　
　　　本系统由四台水泵电机，它们组成变频循环工作方式，采用变频器实现对四台水泵电机的软起动和变频调速，运行采用"先启先停“的工作方式，压力传感器检测当前水压信号，送入PLC与预先设定的压力值进行PID运算，来控制变频器的输出电压和频率，进行改变水泵电机的转速来改变供水量，来保证网管压力稳定在设定值附近，采用组态软件来完成系统监控，实现运行状态的显示及数据和报警的查询。
　　　
关键词：PLC  变频器  组态软件  恒压供水  变频调速

ABSTRACT
      According to he requirement of China's urban water supply, this paper designs a set of water supply system of frequency control of constant voltage based on  PLC,and have developed good operation management interface using SupervisionControl and DataAcquisition .the is made up of PLC ,transducer,units of pump,pressure sensor and control machine and so on,The PLC program,monitoring and configuration of HMI are fully by Step7/Micro.
      This  system is formed by four pump generators and they form the circulating run mode of frequency conversion. With general frequency control ,operation switch adopts the principle of start first stop first ." The detection signal of pressure sensor of hydraulic pressure ,via PLC with set value by carry out PID comparison operation,so ,control frequency and the export voltage converter ,and then the rotational speed that changes pump generator come to change water supply quantity ,eventually ,it is nearby to maintain pipe net pressure to stabilize when set value ,Through work control machine the connection with PLC,with group form software consummately systematic monitoring ,have realized operation state development to show and data ,report to the police inquiry.

Key words:   PLC   Inverter   King view   Constant pressure of water   Variable velocity variable frequency

目录

一 绪论 1
1.1研究背景 1
1.2设计思想 3
二 系统的理论分析及方案的确定 5
2.1 设计任务及要求 5
2.2控制方案的确定 6
2.3供水系统的控制流程 11
3水泵机组选型 15
3.1选型基本要求 15
3.2容量的确定 15
3.3水泵型号确定 18
4 变频器的选型 21
4.1 变频器简介 21
4.2  变频器的确定 21
4.3 变频器外围设备选择 25
5 可编程控制器(PLC) 28
5.2 PLC的工作原理 30
5.3 PLC及压力传感器的确定 30
6变频器与PLC的连接及设定 31
6.1、I/O分配和变频器参数设置： 31
6.2控制电路外围接线： 33
7系统软件的设计 39
7.1  PLC控制程序设计 39
7.2主程序图及程序设计 41
八 总结 55
致  谢: 57
中文翻译 59
外文文献 64