IC693MCD001
IC693MCD001 分析聯(lián)鎖與保護(hù)環(huán)節(jié)：
生產(chǎn)機(jī)械對(duì)于安全性、可靠性有很高的要求，實(shí)現(xiàn)這些要求，除了合理地選擇拖動(dòng)、控制方案外，在控制線(xiàn)路中還設(shè)置了一系列電氣保護(hù)和必要的電氣聯(lián)鎖。在電氣控制原理圖的分析過(guò)程中，電氣聯(lián)鎖與電氣保護(hù)環(huán)節(jié)是一個(gè)重要內(nèi)容，不能遺漏。
總體檢查：
經(jīng)過(guò)“化整為零”，逐步分析了每一局部電路的工作原理以及各部分之間的控制關(guān)系之后，還必須用“集零為整”的方法檢查整個(gè)控制線(xiàn)路，看是否有遺漏。特別要從整體角度去進(jìn)一步檢查和理解各控制環(huán)節(jié)之間的聯(lián)系，以達(dá)到正確理解原理圖中每一個(gè)電氣元器件的作用。
1. 看主電路的步驟
第一步：看清主電路中用電設(shè)備
用電設(shè)備指消耗電能的用電器具或電氣設(shè)備，看圖首先要看清楚有幾個(gè)用電器，它們的類(lèi)別、用途、接線(xiàn)方式及一些不同要求等。
第二步：要弄清楚用電設(shè)備是用什么電器元件控制
控制電氣設(shè)備的方法很多，有的直接用開(kāi)關(guān)控制，有的用各種啟動(dòng)器控制，有的用接觸器控制。
第三步：了解主電路中所用的控制電器及保護(hù)電器
前者是指除常規(guī)接觸器以外的其他控制元件，如電源開(kāi)關(guān)（轉(zhuǎn)換開(kāi)關(guān)及空氣 、萬(wàn)能轉(zhuǎn)換開(kāi)關(guān)。后者是指短路保護(hù)器件及過(guò)載保護(hù)器件，如空氣斷路器中電磁脫扣器及熱過(guò)載脫扣器的規(guī)格、熔斷器、熱繼電器及過(guò)電流繼電器等元件的用途及規(guī)格。一般來(lái)說(shuō)，對(duì)主電路作如上內(nèi)容的分析以后，即可分析輔助電路。
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