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（1）重新启动时，一升速就跳闸。这是过电流十分严重的现象。主要原因有：负载短路，机械部位有卡住;逆变模块损坏;电动机的转矩过小等现象引起。
（2）上电就跳，这种现象一般不能复位，主要原因有：模块坏、驱动电路坏、电流检测电路坏。
（3）重新启动时并不立即跳闸而是在加速时，主要原因有：加速时间设置太短、电流上限设置太小、转矩补偿（V/F）设定较高。
实例
（1）一台LG-IS3-43.7kW变频器一启动就跳“OC”
分析与维修：打开机盖没有发现任何烧坏的迹象，在线测量IGBT（7MBR25NF-120）基本判断没有问题，为进一步判断问题，把IGBT拆下后测量7个单元的大功率晶体管开通与关闭都很好。在测量上半桥的驱动电路时发现有一路与其他两路有明显区别，经仔细检查发现一只光耦A3120输出脚与电源负极短路，更换后三路基本一样。模块装上上电运行一切良好。
（2）一台BELTRO-VERT2.2kW变频通电就跳“OC”且不能复位。
分析与维修：首先检查逆变模块没有发现问题。其次检查驱动电路也没有异常现象，估计问题不在这一块，可能出在过流信号处理这一部位，将其电路传感器拆掉后上电，显示一切正常，故认为传感器已坏，找一新品换上后带负载实验一切正常。
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