1336F-BRF15-AA-EN A-B 主板数码管明灭不定

ABB PM803F
ABB PM803F
ABB PM866K01
ABB D674A906U01

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Description

一例:一台用户维修dcs400(500a)4q调速器,故障是电源打嗝,主板数码管明灭不定,客户送修。我对电源打嗝的分析分两步:1后级有短路,2.取样电路故障,造成反馈取样过压保护。测后级阻抗,静态阻抗无明显短接,拔掉励磁供电,故障依然,由于不连接主板电源一样打嗝。

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