基于PLC桥式起重机控制系统

题目：

基于PLC桥式起重机控制系统

基于PLC桥式起重机控制

摘 要 本文研讨基于可编程序控制器（PLC）和变频器的桥式起重机控制系统的改进。阐述了交流桥式起重机在实际中的应用以及PLC在改造方案中的确定，亦涉及在改造过程中设备的选型。本文以西门子S7-200系列PLC为例，讲述了PLC在交流桥式起重机改造中的的控制方案。与传统控制方案相比，采用PLC控制的桥式起重机可以简化繁重的设备，使控制更加安全可靠。从经济效益与环境效益的角度分析，本设计虽然前期投入一部分资金用于购买PLC及变频器等设备，但是长期运行后的维修成本远低于原系统，并且节能可达30%左右。设计中变频器通过PLC进行无触点控制，使设备运行更加准确，并且减轻了人员的劳动强度，提高了工作效率。 关键词 桥式起重机 变频器 PLC 控制系统

ABSTRACT

This text discussion the improved design of bridge crane control system based on PLC and frequency converter. Introduced the application of Bridge crane, the application of PLC in reconstructive transform and choosing the device. The text takes Siemens S7-200 PLC series as an example, introduced the control project of Bridge crane system. Compared with traditional control scheme，PLC-based Bridge Crane can Simplify the heavy equipment，and make control more safety and reliable.

Analysis from economic benefits and environmental benefits, The maintenance cost is far below original system after long-term operation，and Saves about 30% of energy，beside a fond musts put into buying PLC and inverter and other equipment . In this design, Inverter non-contact programmable controller controls the equipment to run more accurate, as well as reduced labor strength, increased efficiency.

Key words: bridge crane; frequency converter; PLC; control system

目录

第一章 绪论.................................................................................................................. 1 1.1 桥式起重机的简介 ............................................................................................. 1 1.2 主要研究内容及意义 ......................................................................................... 1 第二章 控制方案设计.................................................................................................. 4 2.1系统组成 .............................................................................................................. 4 2.2 大车控制系统的设计 ......................................................................................... 4 第三章 系统硬件设置.................................................................................................. 6 3.1变频调速 .............................................................................................................. 7 3.1.1变频调速的基本原理 .................................................................................... 7 3.1.2变频器的选用 ................................................................................................ 9 3.2电动机的选择 ................................................................................................. 12 3.3 常用辅助器件的选择 .................................................................................... 14 3.4 可编程控制器 ................................................................................................... 17 3.4.1 PLC的概述............................................................................................... 17 3.4.2 PLC的选型——SIEMENS S7-200 ......................................................... 18 3.4.3 I/O端口分配............................................................................................. 20 3.4.4 PLC系统接线方式................................................................................... 21 第四章 系统软件设计................................................................................................ 23 4.1 主程序 ............................................................................................................. 24 4.2 公用程序 ......................................................................................................... 25 4.3 大车控制程序 ................................................................................................. 27 4.4 其他子程序设计 .............................................................................................. 29 第五章 设计总结........................................................................................................ 30 参考文献...................................................................................................................... 32 附录.............................................................................................................................. 33 致谢.............................................................................................................................. 41