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Speed control of a drive can be used to control

  • A.the insulation class required of the machine
  • B.the ambient temperature of the installation
  • C.the number of poles for which the machine is wound
  • D.flow, tension, production rate or position

Answer: D

In each case the speed is the manipulated variable and the process quantity is what is actually being regulated, with the drive taking its reference from a process controller. That is why so many drives sit inside a larger loop rather than being commanded directly.

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