描述
1X00781H01L
我的分析是这样的，过流过压在直流调速器上的反应，都是输出不稳定，脉冲缺失的保护，正好对应了输出不稳定故障。根据维修abbdcs系列调速器的经验，输出不稳定，还得分重载和轻载！？如果重载输出不稳定，一般故障出在功率驱动前后级或功率模组；如果轻载重载输出都不稳定，（甚至飞车）故障一般出在电机反馈电路。由于客户现场使用电机较大，达几百个千瓦，电话联系时，我确定了马达碳刷没有打火，且故障机原来一直使用中，故障出现后，不管轻载还是重载，电枢电流都波动很大。于是建议客户送修。（因为湖北湖南到广东，现在高铁还是很方便的）
修复检测电路，运行试机，轻载正常。但轻载输出正常，并不代表输出就正常了，脉冲丢失同样轻载正常且转速均匀有力。这时要调试软件，将励磁禁止，启动，监控0911参数，提示321dd，同时调速器跳出f517故障。根据诊断提示，确定脉冲驱动组，用示波器测输出脉冲，果然v相模块上桥无驱动脉冲。，这就好办了，可以根据故障点反向查找，最后确认主控板驱动三极管性能不良！换新，故障排除。
总体来说，abbdcs系列直流调速器维修大同小异，不同点在不同的软件应用。Abb本身提供的软件，是非常强大的，很多故障，通过面板监控、诊断提示，是可以快速找到故障点的。作为维修工程师，说时间就是金钱，一点也不夸张。特别是有用户在现场等待（或现场维修），先了解abb产品的应用程序，是很关键的。
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