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Selecting a speed control method begins with

  • A.the insulation class of the machine to be used
  • B.the ambient temperature of the installation
  • C.the speed range and torque profile the load requires
  • D.the cost of the converter available from the supplier

Answer: C

Everything else follows from what the load demands at each speed and how accurately that speed has to be held. A method adequate for a fan is quite inadequate for a machine tool, and the difference is visible in the load's requirements before any equipment is considered.

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