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The dc link capacitor of a drive must also be

  • A.charged from an external supply before every start
  • B.replaced after every operation of the braking chopper
  • C.discharged safely before maintenance
  • D.removed from the drive before it is switched off

Answer: C

It holds a lethal charge for minutes after the supply is removed, so a discharge resistor and a positive means of verifying zero volts are essential. Warning labels and a stated waiting time appear on every drive enclosure.

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