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%...
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...
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...
