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The commonest mistake in specifying a variable-speed drive is

  • A.using the cubic law when sizing a fan application
  • B.failing to check the torque required at the lowest speed
  • C.specifying a machine of the correct rating for the duty
  • D.fitting a feedback device where accuracy is required

Answer: B

A drive sized on rated power alone may have neither the torque nor the cooling to work at the bottom of its range, which is exactly where the process often needs it. Checking the torque and the thermal duty at the extremes of the range is what prevents it.

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