產(chǎn)品詳情
變頻器的輸入中包括對(duì)運(yùn)行/ 停止、正轉(zhuǎn)/ 反轉(zhuǎn)、點(diǎn)動(dòng)等運(yùn)行狀態(tài)進(jìn)行操作的數(shù)字量輸入(開關(guān)型指令),這些常來自PLC 的數(shù)字量輸出。PLC 通常利用其內(nèi)部的繼電器接點(diǎn)(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,運(yùn)行狀態(tài)指令,如圖1 和圖2 所示。在進(jìn)行數(shù)字量的連接時(shí)應(yīng)注意:
(1)使用繼電器輸出型P L C 與變頻器相連時(shí),應(yīng)注意不良常帶來變頻器誤,因此在實(shí)際接線中一定要注意連接可靠。
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