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The energy saving from a drive retrofit is estimated from

  • A.the load's duty profile and its power-speed relation
  • B.the rated power of the machine alone
  • C.the switching frequency of the converter to be fitted
  • D.the number of poles of the existing machine

Answer: A

How much of the year the load spends at each flow, combined with the cubic or proportional law for that load type, gives the annual figure. Estimating from the rated power alone can overstate the saving by an order of magnitude.

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