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Preventive maintenance on a drive should include

  • A.discharging the dc link capacitor while running
  • B.cleaning the heatsink and checking the fans
  • C.replacing the switching devices at fixed intervals
  • D.reprogramming the control firmware every year

Answer: B

Dust on a heatsink raises the thermal resistance and a failing fan raises it further, and both are easily checked. Devices are replaced on failure rather than on a schedule, and the firmware is left alone unless there is a reason to change it.

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