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A drive tripping on overload after several minutes of running suggests

  • A.the load exceeds what the machine or drive can sustain
  • B.a short circuit in the output wiring of the drive
  • C.an incorrect dead time setting in the modulator
  • D.a failure of the dc link precharge contactor

Answer: A

Thermal trips integrate current over time, so a delayed trip is the signature of a genuine overload rather than a fault. Checking the mechanical load and the drive's current limit settings is the sensible starting point.

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