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我們有自己的內(nèi)部庫存和大量的供應(yīng)商為分銷商為您帶來的解決方案滿足您的需求,專注于停產(chǎn)的控制系統(tǒng)零部備件！

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　PLC控制系統(tǒng)的接地設(shè)計 
      導(dǎo)讀： 設(shè)備、控制系統(tǒng)良好的接地，不僅是保證人身安全所需的“電擊防護(hù)”措施，而且也是抑制干擾、減小電磁干擾、提高系統(tǒng)可靠性的重要手段，在設(shè)計、施工階段必須予以重視。 

　　設(shè)備、控制系統(tǒng)良好的接地，不僅是保證人身安全所需的“電擊防護(hù)”措施，而且也是抑制干擾、減小電磁干擾、提高系統(tǒng)可靠性的重要手段，在設(shè)計、施工階段必須予以重視。 

　　PLC控制系統(tǒng)對接地的一般要求如下： 

　　①系統(tǒng)接地必須良好，對于PLC控制系統(tǒng)，接地電阻應(yīng)小于4Q。 

　　②接地線必須有足夠大的線徑，獨(dú)立安裝的PLC基本單元，應(yīng)使用截面積在2.5nim2以上的黃/綠線與系統(tǒng)保護(hù)接地線(PE)連接。 

　?、勰K化結(jié)構(gòu)的PLC，各模塊與機(jī)架間一般可以通過模塊本身的接地連接端，使得各模塊與嘰架間保持良好的接地，但機(jī)架與系統(tǒng)保護(hù)地之間應(yīng)保證接地良好，應(yīng)使用截面積在2.5mm2以上的黃/綠線與系統(tǒng)保護(hù)接地線(PE)連接。 

　?、芟到y(tǒng)中的其他控制裝置(如驅(qū)動器、變頻器等)的接地必須同樣符合規(guī)范，并獨(dú)立接地。 

　　按照DINEN標(biāo)準(zhǔn)規(guī)定，各控制裝置的接地線的線徑如表7-4.1所示。表中“通過固定的連接”是指控制裝置通過導(dǎo)電基座與良好接地的電氣柜(元件安裝板)進(jìn)行接地連接時的要求。 

　?、菹到y(tǒng)中的各類屏蔽電纜的屏蔽層、金屬軟管、走線槽(管)、分線盒等均必須保證接地良好。  

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