福建遠臣機電工程分部

數(shù)字量信號連接應注意的問題           

變頻器的輸入信號中包括對運行/ 停止、正轉/ 反轉、點動等運行狀態(tài)進行操作的數(shù)字量輸入信號（開關型指令信號），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 ）或具有開關特性的元器件（晶體管輸出型PLC）與變頻器相連，得到運行狀態(tài)指令，如圖1 和圖2 所示。在進行數(shù)字量信號的連接時應注意：

（1）使用繼電器輸出型P L C 與變頻器相連時，應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）設計變頻器的輸入信號電路時，應盡量避免采用繼電器等感性負載，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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