IC693APU302

IC693APU302屏蔽干擾源是抑制干擾的很有效的方法。通常變頻器本身用鐵殼屏蔽，可以不讓其電磁干擾泄露，但變頻器的輸出線好用鋼管屏蔽，特別是以外部信號(hào)（從控制器上輸出4~20mA信號(hào)）控制變頻器時(shí)，要求該控制信號(hào)線盡可能短（一般為20m以內(nèi)），且采用屏蔽雙絞線，并與主電路線（AC380）及控制線（AC220V）完全分離。此外，系統(tǒng)中的電子敏感設(shè)備線路也要求采用屏蔽雙絞線，特別是壓力信號(hào)。且系統(tǒng)中所有的信號(hào)線決不能和主電路線及控制線放于同一配管或線槽內(nèi)。為使屏蔽有效，屏蔽層可靠接地。

（1）設(shè)備的電源線和信號(hào)線應(yīng)盡量遠(yuǎn)離變頻器的輸入輸出線。

（2）其它設(shè)備的電源線和信號(hào)線應(yīng)避免和變頻器的輸入輸出線平行。

如果采取了以上的辦法之后還是不能夠奏效，那么繼續(xù)以下辦法：

所謂干擾的隔離，是指從電路上把干擾源和易受干擾的部分隔離開來，使他們不發(fā)生電的聯(lián)系。通常是在電源和控制器及變送器等放大器電路之間在電源線上采用隔離變壓器以免傳導(dǎo)干擾，電源隔離變壓器可應(yīng)用噪聲隔離變壓器。

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