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The turndown ratio of a drive tells you

  • A.how much torque it can develop at standstill
  • B.how accurately it holds a commanded speed
  • C.how quickly it can reverse direction
  • D.how far below full speed it can usefully be operated

Answer: D

A drive quoted as 20 to 1 can be run down to five per cent of rated speed while still meeting the torque and accuracy the specification requires. Beyond that ratio the cooling, the feedback resolution or the control stability becomes the limit.

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