处理方法:脱开变频器的输出线,用兆欧表测量三相对地绝缘情况和三相电组,如果电机或电缆有问题,更换电机和电缆;如果输出正常的话,就检查变频器的主回路,主要检查IGBT、逆变块和整流桥等。如何判断IGBT、逆变块和整流桥是否正常呢,这里我把上述完好电器件用万用表二极管档进行测试,测试结果如:
② 对于逆变块,万用表黑表笔测正极,红表笔测负极时,阻值为0.67MΩ左右,反之无穷大。万用表黑表笔测接地极,红表笔测负极时,阻值为0.34MΩ左右,反之无穷大;万用表黑表笔测正极,红表笔测接地极时,阻值为0.34MΩ左右,反之无穷大。
⑤ 在确定电机和绕组线圈故障后,更换时注意原有型号和参数。
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