基于PLC的变频恒压供水系统的设计毕业设计.doc

毕业设计（论文） 题 目 基于 系统的设计 系 （院） 系 专 业 电气工程与自动化 班 级 20级班 学生姓名 学 号 指导教师 职 称 二〇一年六月十日 独 创 声 明 本人郑重声明：所呈交的毕业设计(论文)，是本人在指导老师的指导下，独立进行研究工作所取得的成果，成果不存在知识产权争议。据我所知，除文中已经注明引用的内容外，本设计（论文）不含任何其他个人或集体已经发表或撰写过的作品成果。对本文的研究做出重要贡献的个人和集体均已在文中以明确方式标明。 本声明的法律后果由本人承担。 作者签名: 年 月 日 毕业设计（论文）使用授权声明 本人完全了解滨州学院关于收集、保存、使用毕业设计（论文）的规定。 本人愿意按照学校要求提交学位论文的印刷本和电子版，同意学校保存学位论文的印刷本和电子版，或采用影印、数字化或其它复制手段保存设计（论文）；同意学校在不以营利为目的的前提下，建立目录检索与阅览服务系统，公布设计（论文）的部分或全部内容，允许他人依法合理使用。 （必威体育官网网址论文在解密后遵守此规定） 作者签名: 年 月 摘 要  Frequency Conversion Constant Pressure Water-supply System Based on PLC Abstract This graduation design is composed of PLC, frequency converter, water pump unit and related equipment such as a set of variable frequency constant pressure water supply system. This system effectively combine PLC and frequency converter, sensors and other equipment, work together and play to the advantages of mine equipment, has reached the maximum meet the users demand, this graduation design are characterized by their smooth operation, high reliability, convenient operation and low energy consumption and energy saving characteristics in many aspects. This system firstly set up in advance inverter built-in PID module parameters, then through the change of pressure sensor according to users water consumption caused by the hydraulic pressure change feedback constitute a closed-loop control system; PID module to adjust the working state of the pump and output flow, so as to achieve the design concept of constant pressure water supply. This graduation design is the first introduction to adopt the mode of frequency control of motor speed to achieve the principle of constant pressure water supply; The Times, the water pressure change of water pump set working state, water pumps in variable frequency and power frequency conversion conditions between the two kinds of operation mode and process of research and analysis, design and research based on programmable logic controller (P