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  1. littleriver

    Soft Start- Noise

    Sorry for my late reply.I was called away on another problem.The unit is a BXLD-718-N. The noise is not a mechanical rattle. The best description is a loud hum something like an overloaded breaker. The unit will make the noise for a second on a bog down during grinding,but for the most part the...
  2. littleriver

    Soft Start- Noise

    Thank you for response. The drive does not have a bypass.Temperature does not appear to make a difference. It is not a rattling noise,more like a loud humming.The noise only occurs in the first 5 seconds of start when the current is the highest.The application is on a hog grinder. while grinding...
  3. littleriver

    Soft Start- Noise

    I have a Motortronics 500hp soft start.The unit has been in service for 5 years.When starting the unit it has always made a humming noise for about the first 5 seconds.Recently this noise has gotten much louder.The unit appears to still be working.Ramp time is 10 seconds,60%intial voltage,200%...
  4. littleriver

    soft starters on std or high efficiency motors

    Thank you for your reply jraef.Iam using a current ramp with a ramp time of 15 sec.A SF-1.15,NEMA DESGN-20.THE MAX CURRENT IS 600% FLA-547.The soft start keeps track of thermal load based on these and other parameters and will shut down at 100%.I do not have all the parameter sets today because...
  5. littleriver

    soft starters on std or high efficiency motors

    I recently installed a 500hp grinder-(hog).I used A SOFT START to bring the 500hp motor up to speed.The motor failed in about a month.The motor mfr. replaced the motor under warranty,but stated that they would not warranty the motor unless we replaced it with a high efficiency type motor.They...
  6. littleriver

    tandem motors

    I want to direct couple two 500hp 480v induction motors to a grinding mill,one motor at each end of the shaft.I would like to use two soft starts to start the motors at the same time.Mechanically we are capable of handling the hp.I would like to know if this is possible without using fluid...

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