供水控制实验系统开发

论文编号:ZD1082    论文字数:20631,页数:44

 摘     要
 随着人民生活水平的日趋提高，新技术和先进设备的广泛应用，供水设计得到了发展的机遇。于是选择一种符合各方面规范、卫生安全而又经济合理的供水方式，给供水设计带来了新的挑战。本系统采用PLC进行逻辑控制，采用带PID功能的变频器进行压力调节，系统具有工作可靠，使用方便，压力稳定，无冲击等优越性。
 本设计恒压变频供水设备由PLC、变频器、传感器、低压电气控制柜和水泵等组成。通过PLC、变频器、继电器、接触器控制水泵机组运行状态,实现管网的恒压变流量供水要求。设备运行时,压力传感器不断将网管水压信号变换成电信号送入PLC,经PLC运算处理后,获得最佳控制参数,通过变频器和继电器控制元件自动调整水泵机组高效率地运行。供水系统的监控主要包括水泵的自动启停控制、供水压力的测量与调节、系统主管道水压；系统水处理设备运转的监视、控制；故障及异常状况的报警等。现场监控站内的控制器按预先编制的软件程序来满足自动控制的要求，即根据供水管的高/低水压位信号来控制水泵的启/停及进水控制阀的开关，并且进行溢水和枯水的预警等。
 文中详细介绍了所选PLC机、变频器、传感器的特点、各高级单元的使用及设定情况，给出了系统工作流程图、程序设计流程图及设计程序。
 关键词：PLC  恒压供水 触摸屏 变频器
 
Abstract
 With the improvement of people’s living standard, the application of new technique and advanced equipment provide a new development for the design of water supply. It is a challenge for us to select a way of water supply with high standard, secure and healthy, economical, and reasonable. This system adopts PLC logic control, and transducer with PID function to adjust the  pressure, which presents many advantages, such as high reliability, convenience in use, stability in pressure.    The design are made of Programmable Logic controller ，transducer, sensor, low pressure control manufacture tank, etc. Through transducer and relay, contactor controls pumping unit running status, the pipe network achieves to the requirement of constant pressure variable flow-rate water supply. When the equipment on-the-fly, pressure gauge without intermission translates the pipe network hydraulic pressure signal to electrical signal enter microcompute.The dam made up of software programs satisfacted its self governing oblige，namely on the basis of high or low-water signal controls radial diffuser influent valve’s switch, and procees overfull and low water’s grade from water tank and pond back of the monitor prime including radial diffuser automatism opening cease dam , water level flowing, man metric measuring and regulate；under the observation of the the medium ,transducer and bang-bang control component self-correcting pumping unit expeditiously running. Water works on site supervision in station.    The paper mainly introduces the characters of the PLC, transducer, and sensor, the use of each high-quality unitary and design, and provides the flowchart of system work, program and design.
 Key word   PLC    Constant Voltage of Water一supplying   touch screen   transducer
 
目录
摘     要 II
Abstract III
1 绪论 1
1.1 选题背景 2
1.2 文献综述 3
1.3楼宇供水系统实验设计主要内容 4
1.31主要任务与目标 6
1.32主要内容与基本要求 7
2  总体方案设计 7
2.1实验开发基本内容 7
2.1.1高位水箱控制模式 8
2.1.2恒压变频供水系统控制模式 9
2.2楼宇供水对象系统结构 10
3 变频器原理及应用 12
3.1 MIM420 系列变频器 12
3.2变频调速原理 14
3.3 变频调速的节能原理 14
4 上位机软件的设计与调试 15
4.1  步科组态软件概况 15
4.1.1步科组态软件介绍 16
4.1.2 供水系统触摸屏软件设计 18
4.1.3 S7—200 PLC与步科的通讯 20
4.2  组态软件概况 22
4.2.1  力控组态软件介绍 22
4.2.2  供水系统界面开发 23
4.2.3  S7—200 PLC与力控的通讯 23
5 PLC的介绍与编程 24
5.1  S7—200系列PLC简介 25
5.1.1  S7—200实物图 25
5.1.2  PLC各部分组成功能 26
5.1.3  PLC编程元件 27
5.3 PLC的软件地址 28
5.3.1  PLC程序流程图 28
5.3.2  PLC梯形图程序 29
6 总结 32
致谢 33
参考文献 34
附录一 高位水箱模式 35
附录二 恒压供水实验 38
附录三 实验设备图 40
附录四  实验模拟操作平台 41
附录5  PLC程序流程图 42

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