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1·Break-brake operations have three kinds of break-brake electromagnet, over-current trip and manual button.

分闸操作有分闸电磁铁，过电流脱扣电磁铁及手动按钮操作三种。

2·This paper analyzed the reason of trip for over current and overload in VVVF. And introduced how to determine on these fault.

本文对变频器的过电流跳闸和过载跳闸的故障原因进行了分析，并介绍了如何判断的具体方法。