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A drive whose reference comes from a process controller is said to be

  • A.cascaded within a process loop
  • B.operating entirely in open loop
  • C.under manual control from the operator's desk
  • D.independent of the process it serves

Answer: A

The process loop is slow and the speed loop fast, which is the same nesting principle that puts the current loop inside the speed loop. Tuning them so that each is well separated in bandwidth from the next is what keeps the whole arrangement stable.

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