A06B-6096-H201

A06B-6096-H201利用PLC的開關(guān)量輸出控制變頻器。PLC的開關(guān)輸出量一般可以與變頻器的開關(guān)量輸入端直接相連。這種控制方式的接線簡單，抗干擾能力強(qiáng)。利用PLC的開關(guān)量輸出可以控制變頻器的啟動(dòng)／停止、正／反轉(zhuǎn)、點(diǎn)動(dòng)、轉(zhuǎn)速和加減時(shí)間等，能實(shí)現(xiàn)較為復(fù)雜的控制要求，但只能有級調(diào)速。

使用繼電器觸點(diǎn)進(jìn)行連接時(shí)，有時(shí)存在因接觸不良而誤操作現(xiàn)象。使用晶體管進(jìn)行連接時(shí)，則需要考慮晶體管自身的電壓、電流容量等因素，保證系統(tǒng)的可靠性。另外，在設(shè)計(jì)變頻器的輸入信號電路時(shí)，還應(yīng)該注意到輸入信號電路連接不當(dāng)，有時(shí)也會造成變頻器的誤動(dòng)作。

例如，當(dāng)輸入信號電路采用繼電器等感性負(fù)載，繼電器開閉時(shí)，產(chǎn)生的浪涌電流帶來的噪聲有可能引起變頻器的誤動(dòng)作，應(yīng)盡量避免。

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