A16B-2300-0022
A16B-2300-0022
根据VFD的工作原理，所谓“顺藤摸瓜”法，就是沿着故障现场和信号路径越走越深，直达故障发生点，终找到故障位置的方法。
例如VFD输出电压三相不平衡。这种失败显然是由两种可能性造成的。一种可能是逆变桥的六个单元中至少有一个损坏(断路)，另一种可能是六组驱动信号中至少有一组损坏。假设一个逆变单元没有驱动信号，可以进一步确定驱动电路的故障位置，沿着藤蔓就可以找到。对于这个具体的例子，你可以从上到下，也就是从驱动信号的来源，也就是CPU的输出来检查。
当CPU输出信号时，检查光耦的输入端是否有信号。如果没有信号，CPU和光耦的输入端断开。如果有信号，检查光耦的输出，看是否有信号。如果没有信号，光耦损坏。如果有信号，再次检查放大器电路的输入和输出。如果输入有信号，输出无信号，则故障是由放大电路或放大管或相关元件损坏引起的。那么进一步的实施将会更容易。
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