（3）松下變頻器驅(qū)動(dòng)電路損壞
在DV707系列變頻器的修補(bǔ)中常常也會(huì)碰到逆變模塊損壞的一同驅(qū)動(dòng)電路也已損壞。驅(qū)動(dòng)電路無(wú)負(fù)壓是驅(qū)動(dòng)電路損壞的多見(jiàn)景象。DV707系列變頻器在功率器材上選用的是富士的PIM模塊，歸于IGBT類型的。我們知道IGBT大功率管是電壓導(dǎo)通型的，在無(wú)負(fù)壓的情況下將致使IGBT無(wú)法有用關(guān)斷，發(fā)作誤導(dǎo)通。負(fù)壓通常是由穩(wěn)壓兩極管發(fā)作的，這也是一個(gè)最多見(jiàn)的損壞部位，更換之，驅(qū)動(dòng)波形就應(yīng)該恢復(fù)正常。
（4）松下變頻器LV缺點(diǎn)
LV缺點(diǎn)也是在修補(bǔ)中常?？梢耘龅降木跋笾?。格外是在DV700系列變頻器。在打掃外部電源疑問(wèn)的要素后，疑問(wèn)比較多的應(yīng)該是查看電路缺點(diǎn)，通過(guò)降壓電阻取樣，經(jīng)光耦阻隔后光耦信號(hào)送至主控制板處理。降壓電阻，阻隔光耦都或許出現(xiàn)損壞。更換后，機(jī)器應(yīng)能恢復(fù)正常。
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