描述

（1）變頻器周圍所有繼電器、接觸器的控制線圈上需加裝防止沖擊電壓的吸收裝置，如rc吸收器；

（2）盡量縮短控制回路的配線距離，并使其與主線路分離；

（3）指定采用屏蔽線的回路，必須按規(guī)定進行，若線路較長，應采用合理的中繼方式；

（4）變頻器接地端子應按規(guī)定進行，不能同電焊，動力接地混用；

（5）變頻器輸入端安裝噪聲濾波器，避免由電源進線引入干擾。

以上即為不輸出干擾、不傳送干擾、不接受干擾的“三不”原則。

2.變頻器對周邊設(shè)備的影響及故障防范

變頻器的安裝使用也將對其他設(shè)備產(chǎn)生影響，因此，研究應該采取哪些措施是非常必要的。

（1）電源高次諧波

由于目前的變頻器幾乎都采用pwm控制方式，在電源側(cè)產(chǎn)生高次諧波電流，并造成電壓波形畸變，對電源系統(tǒng)產(chǎn)生嚴重影響，通常采用的處理措施是：采用專用變壓器對變頻器供電，與其它供電系統(tǒng)分離；在變頻器輸入側(cè)加裝濾波電抗器，降低高次諧波分量。

（2）對于有進線電容器的場合因高次諧波電流將使電容電流增加，造成發(fā)熱嚴重，必須在電容前串接電抗器，以減小諧波分量。

此外，由于變頻器的軟件開發(fā)更加完善，可以預先在變頻器的內(nèi)部設(shè)置各種故障防止措施，并使故障化解后仍能保持繼續(xù)運行;

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