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The commonest cause of dissatisfaction with a new drive installation is

  • A.a duty that was not properly established beforehand
  • B.the choice of an unfamiliar manufacturer
  • C.the switching frequency being set too high
  • D.the use of a cage rather than a wound rotor machine

Answer: A

Torque needed at the bottom of the range, thermal duty over the cycle and the accuracy actually required are the three things most often assumed rather than established. All three are cheap to check before purchase and expensive to correct afterwards.

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