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IC693MCD001

IC693MCD001 分析聯鎖與保護環節：

  生產機械對于安全性、可靠性有很高的要求，實現這些要求，除了合理地選擇拖動、控制方案外，在控制線路中還設置了一系列電氣保護和必要的電氣聯鎖。在電氣控制原理圖的分析過程中，電氣聯鎖與電氣保護環節是一個重要內容，不能遺漏。

  總體檢查：

  經過“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系之后，還必須用“集零為整”的方法檢查整個控制線路，看是否有遺漏。特別要從整體角度去進一步檢查和理解各控制環節之間的聯系，以達到正確理解原理圖中每一個電氣元器件的作用。

  1. 看主電路的步驟

  第一步：看清主電路中用電設備

  用電設備指消耗電能的用電器具或電氣設備，看圖首先要看清楚有幾個用電器，它們的類別、用途、接線方式及一些不同要求等。

  第二步：要弄清楚用電設備是用什么電器元件控制

  控制電氣設備的方法很多，有的直接用開關控制，有的用各種啟動器控制，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電器

  前者是指除常規接觸器以外的其他控制元件，如電源開關（轉換開關及空氣 、萬能轉換開關。后者是指短路保護器件及過載保護器件，如空氣斷路器中電磁脫扣器及熱過載脫扣器的規格、熔斷器、熱繼電器及過電流繼電器等元件的用途及規格。一般來說，對主電路作如上內容的分析以后，即可分析輔助電路。

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