【正文】 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。s products ( ), which greatly improved the precision and stability operations。 關(guān)鍵詞 :可編程序控制器；橋式起重機(jī)；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。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(qiáng)的運(yùn)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(jī)運(yùn)行參數(shù)，保證起重機(jī)各機(jī)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(jī)多幾種速度。傳統(tǒng)的橋式起重控制系統(tǒng)主要采用繼電器、接觸器進(jìn)行控制，并使用交流繞線串電阻的方法進(jìn)行啟動(dòng)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(fèi)大，效率低等缺點(diǎn)。 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(jī)作為物料搬運(yùn)系統(tǒng)中一種典型設(shè)備，在企業(yè)生產(chǎn)活動(dòng)中應(yīng)用廣泛作用顯著，故對于提高其運(yùn)行效率，確保運(yùn)行安全，降低物料搬運(yùn)成本是十分重要。因此根據(jù)橋式起重機(jī)的運(yùn)行特點(diǎn)，將可編程序控制器與變頻器結(jié)合應(yīng)用于橋式起重機(jī)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(hù)功能完善，便于及時(shí)發(fā)現(xiàn)、查找、處理故障；并且節(jié)約了能源。變頻器內(nèi)部具有故障自診斷功能 ,能實(shí)現(xiàn)系統(tǒng)的過電壓、過電流和過載保護(hù)等功能。s operational characteristics, the bination of PLC and frequency converter used in bridge crane control system, PLC system uses the Japanese Mitsubishi pany39。 integrated protection functions and easy to detect, locate, treatment failure。 frequency conversion。 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(jī)簡介 ................................................................................................... 4 本課題設(shè)計(jì)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(shí)的注意要點(diǎn) ..................................................................... 13 ..................................................................................... 13 力拖動(dòng)方案及電機(jī)的選擇 ................................................................................... 15 用輔件的選擇 .................................................................................................... 16 第三章 橋式起重機(jī)電氣控制設(shè)計(jì) ................................................................................... 19 提升機(jī)構(gòu)與移動(dòng)機(jī)構(gòu)對電氣控制的要求 .............................................................. 19 重機(jī)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(jī)的安全使用注意事項(xiàng) .......................................................... 27 第四章 橋 式起重機(jī) PLC 程序設(shè)計(jì) ................................................................................. 29 設(shè)計(jì)目標(biāo)及思路 ................................................................................................. 29 控制需求分析與硬件設(shè)計(jì) .................................................................................. 30 橋式起重機(jī) PLC 控制程序設(shè)計(jì) ......................................................................... 31 第五章 結(jié)束 語 ........................................................................................................... 34 致謝 ........................................................................................................................ 35 參考文獻(xiàn) ................................................................................................................. 36 第一章 緒 論 橋式起重機(jī)簡介 橋式起重機(jī)