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Which of these most often limits the life of a drive in service?

  • A.The dc link capacitors and the cooling fans
  • B.The switching semiconductors themselves
  • C.The control processor and its firmware
  • D.The busbars and mechanical assembly

Answer: A

Both are wear-out items with lives measured in years and strongly dependent on temperature, whereas the semiconductors and the electronics usually outlast the installation. Planned replacement of both is cheaper than an unplanned failure.

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