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  • Users: Smoem
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  1. Smoem

    DC bus overvoltage at random times

    Thanks for all the responses, it turned out to be solveable with sensorless vector speed control. The load was chaotically varying after running for a long time, as the contents of the drum got bunched up more and more into a cohesive mass. It rode up as the drum rotated, and slammed down when...
  2. Smoem

    DC bus overvoltage at random times

    The times I personally witnessed it tripping was: Once on acceleration, it tripped while the load was unevenly distributed inside the drum and started over-hauling the drive faster than the drive accelerated. And once while it was running at a constant speed with a very light load. At the end...
  3. Smoem

    DC bus overvoltage at random times

    We're struggling with a Beijer BFI P2 90kW VFD right now. 3 phase 400V. It's driving a large rotating drum for washing fishing nets. This means it's seeing a very varying load through a gearbox at roughly a 240:1 ratio. It's a tried and tested application, which to my knowledge has never...

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