Mv Soft Starter Problem
Posted 08 May 2009 - 01:58 PM
Also, on a previous attempt to increase initial voltage and reduce ramp time (70% voltage and 2 sec ramp), the soft starter went out on phase loss. However, no fuses or circuit breakers tripped. How could it be that the soft starter that it had a phase loss? Could this be from excessive harmonics generated by the soft starter, causing it to incorrectly sense incoming waveforms, then misfire causing an errant "phase loss" trip.
Any help is appreciated. The soft starter was manufactured by Motortronics.
Posted 10 May 2009 - 02:57 AM
Welcome to the forum.
Next time you start th motor, see if you can measure the speed where the vibration becomes a problem. If this is 1/7 or 1/13 of synchronous speed, then you have a crawling problem.
If the speed is different, then I would look at coupling alignment, motor and load mounting etc.
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