文档介绍：南京工程学院
自动化学院
本科毕业设计(论文)
题目:起重机PLC控制改造设计
专业: 自动化(数控技术)
班级 T数控091 学号:0**********
学生姓名:
指导教师:
起迄日期: ~
设计地点: 实验楼
Graduation Design (Thesis)
Crane control PLC control design
By
GU Qiang
Supervised by
Prof. XU Xiang bing
SchoolofAutomation Nanjing Institute of Technology
May, 2013
摘要
随着现代控制理论的应用,微处理器和微电子技术的发展,使变频调速控制系统日趋成熟。而桥式起重机作为物料搬运系统中一种典型设备,在企业生产活动中应用广泛作用显著,故对于提高其运行效率,确保运行安全,降低物料搬运成本是十分重要。传统的桥式起重控制系统主要采用继电器、接触器进行控制,并使用交流绕线串电阻的方法进行启动和调速,这种控制系统存在可靠性差,故障率高,电能浪费大,效率低等缺点。因此根据桥式起重机的运行特点,将可编程序控制器与变频器结合应用于桥式起重机控制系统, PLC系统采用日本三菱公司产品,大大提高了操作精度和稳定度;综合保护功能完善,便于及时发现、查找、处理故障;并且节约了能源。变频器采用三菱公司FR-A540系列产品,变频器内部控制的核心是 CPU单元,具有较强的运算和控制能力, 能够实现参数化调速控制,设置合理的电机运行参数,保证起重机各机构有较大的调速范围和较高的调速精度,并且可以有7种不同的速度,比传统的起重机多几种速度。变频器内部具有故障自诊断功能,能实现系统的过电压、过电流和过载保护等功能。
In this paper
Along with the application of modern control theory and microprocessor and the development of microelectronics technology, the frequency control of motor speed control system has e increasingly mature. The bridge crane as the materials handling system is a kind of typical equipment, widely used in the enterprise production activities significantly, therefore, to improve the efficiency of its operation, ensure the running safety, it is important to reduce material handling costs. Traditional bridge crane control system mainly adopts relay and contactor to control, munication series resistance of the winding method is used to start and speed control, this control system has poor reliability, failure rate is high, the electric energy waste, low efficiency of faults. So according to the characteristics of bridge crane, combines programmable controller and frequency converter is applied in bridge crane control system, PLC system USES the Japanese mitsubishi products, greatly improve the precision and stability of operation; Comprehensive protection function perfect, facilitate timely find, find, and troubleshooting; And save the energy. Mitsubishi inverter adopts FR - A540 series