DIO280

DIO280

變頻器是把工頻電源（50Hz或60Hz）變換成各種頻率的交流電源，以實現電機的變速運行的設備，其中控制電路完成對主電路的控制，整流電路將交流電變換成直流電，直流中間電路對整流電路的輸出進行平滑濾波，逆變電路將直流電再逆變成交流電。對于如矢量控制變頻器這種需要大量運算的變頻器來說，有時還需要一個進行轉矩計算的CPU以及一些相應的電路。

plc與變頻器一般有三種連接方法

①利用PLC的模擬量輸出模塊控制變頻器PLC的模擬量輸出模塊輸出0～5V電壓信號或4～20mA電流信號，作為變頻器的模擬量輸入信號，控制變頻器的輸出頻率。這種控制方式接線簡單，但需要選擇與變頻器輸入阻抗匹配的PLC輸出模塊，且PLC的模擬量輸出模塊價格較為昂貴，此外還需采取分壓措施使變頻器適應PLC的電壓信號范圍，在連接時注意將布線分開，保證主電路一側的噪聲不傳至控制電路。

②利用PLC的開關量輸出控制變頻器。PLC的開關輸出量一般可以與變頻器的開關量輸入端直接相連。這種控制方式的接線簡單，抗干擾能力強。利用PLC的開關量輸出可以控制變頻器的啟動／停止、正／反轉、點動、轉速和加減時間等，能實現較為復雜的控制要求，但只能有級調速。

使用繼電器觸點進行連接時，有時存在因接觸不良而誤操作現象。使用晶體管進行連接時，則需要考慮晶體管自身的電壓、電流容量等因素，保證系統的可靠性。另外，在設計變頻器的輸入信號電路時，還應該注意到輸入信號電路連接不當，有時也會造成變頻器的誤動作。例如，當輸入信號電路采用繼電器等感性負載，繼電器開閉時，產生的浪涌電流帶來的噪聲有可能引起變頻器的誤動作，應盡量避免。

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