Simoreg K 6RA24 dc drive

[electronics]

We have a winder(paper machine) application with a Siemens 6RA24 drive. On startup the drive is coming up with fault F04. We have eliminated the fault by decreasing the startup tension on the system from 7 to 3. Once the drive is able to crawl, we input the default tension(7) and therafter run the machine without any faults. We have basically found a quick-fix to eliminate the fault on startup and have not found the root cause. I have looked at previous threads by sammy_s and have played around with P086, P087 & P089 with any success.

Please assist with further suggestions.

Mr Electronics

 

[montech]

Looks like your initial motorstart current may be too high.I would put an amp clamp on the offending phase(using the diagnostics) and measure the startup current.I had a similar problem with an AB unit and found that it was a setting for startup overcurrent,but your app is different.Also we went to a gear reducer to reduce startup tourque.