【正文】 摘要 隨著現(xiàn)代控制理論的應(yīng)用，微處理器和微電子技術(shù)的發(fā)展，使變頻調(diào)速控制系統(tǒng)日趨成熟。而橋式起重機作為物料搬運系統(tǒng)中一種典型設(shè)備，在企業(yè)生產(chǎn)活動中應(yīng)用廣泛作用顯著，故對于提高其運行效率，確保運行安全，降低物料搬運成本是十分重要。傳統(tǒng)的橋式起重控制系統(tǒng)主要采用繼電器、接觸器進行控制，并使用交流繞線串電阻的方法進行啟動和調(diào)速，這種控制系統(tǒng)存在可靠性差，故障率高，電能浪費大，效率低等缺點。因此根據(jù)橋式起重機的運行特點，將可編程序控制器與變頻器結(jié)合應(yīng)用于橋式起重機控制系統(tǒng)， PLC 系統(tǒng)采用日本三菱公司產(chǎn)品（ ），大大提高 了操作精度和穩(wěn)定度；綜合保護功能完善，便于及時發(fā)現(xiàn)、查找、處理故障；并且節(jié)約了能源。變頻器采用三菱公司 FRA540 系列產(chǎn)品，變頻器內(nèi)部控制的核心是 CPU 單元，具有較強的運算和控制能力 , 能夠?qū)崿F(xiàn)參數(shù)化調(diào)速控制，設(shè)置合理的電機運行參數(shù)，保證起重機各機構(gòu)有較大的調(diào)速范圍和較高的調(diào)速精度，并且可以有 7種不同的速度，比傳統(tǒng)的起重機多幾種速度。變頻器內(nèi)部具有故障自診斷功能 ,能實現(xiàn)系統(tǒng)的過電壓、過電流和過載保護等功能。 關(guān)鍵詞 :可編程序控制器；橋式起重機；電氣控制系統(tǒng) ABSTRACT With the application of modern control theory, microprocessors and microelectronics technology, variable frequency speed control system to mature. The bridge crane system as a typical material handling equipment, widely used in production activities, significant effect, so to improve its operating efficiency, ensuring safe operation and reduce material handling costs is very important. The traditional bridge crane control system is mainly used for relays and contactors to control and use the munication method of winding series resistance starting and speed, there is poor reliability of this control system, failure rate, energy waste and efficiency low defects. Therefore, under the bridge crane39。s operational characteristics, the bination of PLC and frequency converter used in bridge crane control system, PLC system uses the Japanese Mitsubishi pany39。s products ( ), which greatly improved the precision and stability operations。 integrated protection functions and easy to detect, locate, treatment failure。 and save energy. Inverter with Mitsubishi FRA540 series inverter is a CPU core of the internal control unit, and a strong puting and control, to achieve speed control parameter, set reasonable parameters of the motor is running, ensure that the institutions crane large speed range and high speed accuracy, and can have 7 different speed, more than the traditional cranes several speed. Inverter with fault diagnosis of internal functions, to achieve the system over voltage, over current and overload protection functions. Keywords: programmable logic controller。 frequency conversion。 bridge crane。 Electrical Control System PLCbased electrical bridge crane control system 目錄 摘要 .......................................................................................................................... 1 ABSTRACT ......................................................................................................................... 2 第一章 緒 論 ................................................................................................................... 4 橋式起重機簡介 ................................................................................................... 4 本課題設(shè)計的意義、主要內(nèi)容及基本參數(shù) ........................................................... 7 第二章 PLC 技術(shù)簡介及元器件選擇 ................................................................................... 8 PLC 的基本概念 ................................................................................................. 8 ......................................................................................... 9 ....................................................................................... 10 電氣控制技術(shù)簡介 ............................................................................................ 11 元器件的選擇 .................................................................................................... 13 PLC的選用 ........................................................................................... 13 在選擇 plc時的注意要點 ..................................................................... 13 ..................................................................................... 13 力拖動方案及電機的選擇 ................................................................................... 15 用輔件的選擇 .................................................................................................... 16 第三章 橋式起重機電氣控制設(shè)計 ................................................................................... 19 提升機構(gòu)與移動機構(gòu)對電氣控制的要求 .............................................................. 19 重機電氣控制電路分析 ................................................................ 20 凸輪控制系統(tǒng)簡介 ................................................................................. 23 .................................................................................. 24 橋式起重機的安全使用注意事項 .......................................................... 27 第四章 橋 式起重機 PLC 程序設(shè)計 ................................................................................. 29 設(shè)計目標及思路 ................................................................................................. 29 控制需求分析與硬件設(shè)計 .................................................................................. 30 橋式起重機 PLC 控制程序設(shè)計 ......................................................................... 31 第五章 結(jié)束 語 ........................................................................................................... 34 致謝 ............................................................