White Paper – VFD Selection in Pumping Applications

VFD Selection for Variable and Fixed Speed Pumping Applications


This white paper discusses the following selection criteria for VFD’s in pumping applications.

  • Sizing VFD’s and motors for different pump applications.
  • Variable Torque (Normal Duty) VFD rating for centrifugal pumps compared to Constant Torque (Heavy Duty) VFD rating for positive displacement pumps.
  • Comparing the common NEMA Enclosure ratings for VFD’s and considerations for heat dissipation
  • Optional and auxiliary hardware for VFD’s and where they should be applied.
  • VFD control Inputs and Outputs (I/O) and their uses for pump applications.
  • Different VFD control modes for pumping application and where they should be applied.


BY ADRIAN VAN DER VLIET, P.ENG
ENGINEERING SYSTEMS GROUP

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VFD Selection in Pumping Applications-White Paper

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