數(shù)字量信號連接應(yīng)注意的問題           

變頻器的輸入信號中包括對運(yùn)行/ 停止、正轉(zhuǎn)/ 反轉(zhuǎn)、點動等運(yùn)行狀態(tài)進(jìn)行操作的數(shù)字量輸入信號（開關(guān)型指令信號），這些信號常來自PLC 的數(shù)字量輸出信號。PLC 通常利用其內(nèi)部的繼電器接點（繼電器輸出型P L C ）或具有開關(guān)特性的元器件（晶體管輸出型PLC）與變頻器相連，得到運(yùn)行狀態(tài)指令，如圖1 和圖2 所示。在進(jìn)行數(shù)字量信號的連接時應(yīng)注意：

（1）使用繼電器輸出型P L C 與變頻器相連時，應(yīng)注意接觸不良常帶來變頻器誤動作，因此在實際接線中一定要注意連接可靠。

（2）使用晶體管輸出型P L C 與變頻器相連時，應(yīng)注意晶體管本身的電壓的高低、電流的大小等限制條件在其范圍內(nèi)，保證系統(tǒng)的可靠性。

（3）設(shè)計變頻器的輸入信號電路時，應(yīng)盡量避免采用繼電器等感性負(fù)載，因繼電器開閉產(chǎn)生的浪涌電流可能引起變頻器的誤動作。

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