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Retrofitting a converter to an existing machine requires checking that the machine

  • A.has the same number of poles as the converter is designed for
  • B.is of the same manufacture as the converter being fitted
  • C.has a rated power factor above 0.9 at full load
  • D.can tolerate the inverter's voltage stresses and reduced cooling

Answer: D

Fast switching edges stress winding insulation that was designed for a sinusoidal supply, and running slowly reduces the machine's own ventilation. Inverter-duty windings, output filters and derating curves are the three remedies.

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