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Recording the drive current over a working cycle after commissioning allows

  • A.the insulation class of the machine to be verified
  • B.the harmonic limits of the supply to be established
  • C.the switching frequency to be optimised automatically
  • D.the equivalent current to be checked against the rating

Answer: D

Correct answer: the equivalent current to be checked against the rating

A varying duty is assessed by computing the root mean square of the current over the cycle and comparing it with the machine’s continuous rating. Recording the actual current after commissioning replaces the design estimate with a measurement, which either confirms the sizing or reveals that the duty is heavier than assumed.

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