（3）松下变频器驱动电路损坏
在DV707系列变频器的修补中常常也会碰到逆变模块损坏的一同驱动电路也已损坏。驱动电路无负压是驱动电路损坏的多见景象。DV707系列变频器在功率器材上选用的是富士的PIM模块，归于IGBT类型的。我们知道IGBT大功率管是电压导通型的，在无负压的情况下将致使IGBT无法有用关断，发作误导通。负压通常是由稳压两极管发作的，这也是一个最多见的损坏部位，更换之，驱动波形就应该恢复正常。
（4）松下变频器LV缺点
LV缺点也是在修补中常常可以碰到的景象之一。格外是在DV700系列变频器。在打扫外部电源疑问的要素后，疑问比较多的应该是查看电路缺点，通过降压电阻取样，经光耦阻隔后光耦信号送至主控制板处理。降压电阻，阻隔光耦都或许出现损坏。更换后，机器应能恢复正常。

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