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Electrolytic dc link capacitors limit the life of a drive because they

  • A.gain capacitance with age until they fail short circuit
  • B.cannot tolerate the ripple current the inverter draws
  • C.must be replaced after every power cycle of the drive
  • D.dry out gradually, losing capacitance

Answer: D

Electrolyte escapes slowly through the seal, and the rate roughly doubles for every ten degrees of temperature, so a hot cabinet shortens the life sharply. Film capacitors and the matrix converter's absence of a link are the two ways round it.

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