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A constant-torque load driven above base speed will

  • A.require less torque than the drive is able to give
  • B.cause the drive to run below its commanded speed reference
  • C.exceed the torque the drive can provide
  • D.be comfortably within the capability of the drive

Answer: C

Above base speed the available torque falls with speed while the load's demand does not, so the two curves cross and the drive cannot deliver. Either a larger machine or a different gear ratio is needed to bring the duty inside the envelope.

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