| Abstract:Nowadays paper machine drive systems of DC main shaft and SCR DC drive control unit have been gradually replaced by AC variable frequency and speed drive. From the small range variable speed drive to high precision, fast response, wide range variable speed drive, from the single drive to multiple segments coordination, PROFIBUS fieldbus protocol format is used to achieve communication and control of frequency converter, which is with high efficient drive and good control characteristics, and is widely used in papermaking industry. Based on maintenance practice, the author analyzed the reasons of speed instability, rundownly stop of some part and defects of inverter hardware. |
