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Why do I still have higher Inrush Current with an Altistart softstart than with an Altivar Drive if you ramp up to speed?

Published date: 25 September 2018

Issue:
Why do I still have higher Inrush Current with an Altistart softstart than with an Altivar Drive if you ramp up to speed?

Product Line:
Altivar ATV  Process Drive
 
Environment:
ALL
 
Cause:
Programming Wiring
 
Resolution:
You do not have the same type of  gating integral to a softstart that you do with a VFD.  The SCRs are bringing the voltage up slowly, so you have 3 to 4 times the motor's nameplate Full Load Amps Inrush, as opposed to the 7 times typical with an across the line starter.

 


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