外文文獻(xiàn)翻譯plc控制下的電梯系統(tǒng)-預(yù)覽頁(yè)
【正文】 ator button or contact with the call of the button, and general elevator at both ends of the standing on the call box set a button or touch knob, standing among the call of the box set the two button or touch the button, and the elevator is set up inside the car have (bulk elevator except) control box. Operation box set on a handle switch or layer stand the corresponding button or touch knob on the operation box button or contact the mand button button or touch buttons. The mand button or contact the electrical signals a button called external mands, inside the instructions of a button or touch knob signal called mands within. The mid 1980 s, touch button has been budge button replaced. As the elevator of the base outside the hall call box, in addition to set a call button or touch knob outside, still set a key switch to shut off the elevator, the driver or management personnel to open to the base station, with special twist the key can be key switch, the elevator door is closed after the hall, automatically cut off the elevator control power or power power supply. 4. PLC control of elevator design With the continuous development of city construction, high building is on the increase, the elevator in the national economy and life in a wide range of applications. The lift, as the highrise buildings in the vertical transportation operation has and People39。s not much difference. Domestic manufacturer mostly choose the second method, and the reason is that production is small in scale, their design and manufacturing microputer control device cost is higher。 電梯繼電器控制系統(tǒng)故障率高，大大降低了電梯的可靠性和安全性，經(jīng)常造成停梯，給乘用人員帶來(lái)不便和驚擾，且電梯一旦發(fā)生沖頂或蹲底，不但會(huì)造成電梯機(jī)械部件損壞，還可能出現(xiàn)人生事故。因此PLC 控制技術(shù)加頻調(diào)速技術(shù)已成為現(xiàn)代電梯行業(yè)的一個(gè)熱點(diǎn)。 （ 4） PLC 可進(jìn)行故障自動(dòng)檢測(cè)與報(bào)警顯示，提高運(yùn)行安全性 ，并 便于檢修。電動(dòng)機(jī)交流變頻調(diào)速技術(shù)是當(dāng)今節(jié)電、改善工藝流程以提高產(chǎn)品質(zhì)量和改善環(huán)境，推動(dòng)技術(shù)進(jìn)步的一種主要手段，變頻調(diào)速以其優(yōu)異的調(diào)速性能和起制動(dòng)平穩(wěn)性能，高效率，高功率因數(shù)和節(jié)電效果，廣泛的使用范圍以及其它許多優(yōu)點(diǎn)而被國(guó)內(nèi)外公認(rèn)為最有發(fā)展前途的調(diào)速方式。其特性可適應(yīng)人體感受，并保證運(yùn)行噪聲小，制動(dòng)平穩(wěn)。因此消除了振動(dòng)和噪聲。它采用交流電動(dòng)機(jī)驅(qū)動(dòng)，卻可以達(dá)到直流電動(dòng)機(jī)的水平。設(shè)在一樓的起點(diǎn)站稱為基站，起點(diǎn)站和終點(diǎn)站稱為兩端站，兩端站直接按稱為中間站。 20 世紀(jì) 80 年代中期后，觸鈕已被微動(dòng)按鈕所取代。實(shí)際上，電梯是根據(jù)外部呼叫信號(hào)以及自身控制規(guī)律等運(yùn)行，而呼叫是隨機(jī)的，電梯實(shí)際上是一個(gè)人機(jī)交互式的控制系統(tǒng)，單純用順序控制或邏輯控制是不能滿足控制要求的。
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