在使用繼電器接點時,，常常因為接觸不良而帶來誤動作;使用晶體管進行連接時，則需考慮晶體管本身的電壓,、電流容量等因素,，保證系統(tǒng)的可靠性。

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在設(shè)計變頻器的輸入信號電路時還應(yīng)該注意,，當(dāng)輸入信號電路連接不當(dāng)時有時也會造成變頻器的誤動作。例如,，當(dāng)輸入信號電路采用繼電器等感性負載時,，繼電器開閉產(chǎn)生的浪涌電流帶來的噪音有可能引起變頻器的誤動作，應(yīng)盡量避免,。圖2與圖3給出了正確與錯誤的接線例子,。

圖2變頻器輸入信號接入方式

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