FBM204電纜P0916DC

這是已確定原因是外部原因的VFD中的常見故障。導(dǎo)致這一挑戰(zhàn)的一些外部因素是交流電源線中的瞬時(shí)電壓尖峰以及由連接的機(jī)器慣性引起的檢修負(fù)載。這種情況會(huì)導(dǎo)致連接的負(fù)載保持旋轉(zhuǎn)速度超過驅(qū)動(dòng)電動(dòng)機(jī)指定的速度。發(fā)生這種情況時(shí)，VFD將通過觸發(fā)高直流故障跳閘并關(guān)閉連接到逆變器側(cè)電路的IGBT來保護(hù)其內(nèi)部組件。

　　如果診斷顯示器的交流變頻器中有極端總線故障的跡象，請(qǐng)確保機(jī)器有穩(wěn)定的交流電源，并在由VFD控制的減速時(shí)間電機(jī)上工作，等于連接的負(fù)載。如果VFD用于需要快速減速的應(yīng)用，則可以使用動(dòng)態(tài)制動(dòng)來保護(hù)VFD免受極端總線故障的影響。

　　原因4：高啟動(dòng)電流

　　VFD顯示屏讀數(shù)上的高啟動(dòng)電流可能表明處理速度或連接負(fù)載發(fā)生了意外變化。

　　為了說明這一點(diǎn)，VFD控制的泵和風(fēng)扇的功率要求與其轉(zhuǎn)速立方體成比例地增加，如果VFD負(fù)載以略高于預(yù)期的速度運(yùn)行，將導(dǎo)致VFD過載。

　　為了保護(hù)VFD免受這種過載的影響，請(qǐng)?jiān)趩?dòng)VFD驅(qū)動(dòng)器之前對(duì)其進(jìn)行測試和檢查。例如，在按下啟動(dòng)之前卸載傳送帶，以避免 VFD 負(fù)載的任何部分受潮和碎屑。

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