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The dc link capacitor of a drive is precharged through a resistor in order to

  • A.filter the harmonics drawn from the supply
  • B.limit the inrush current when the drive is energised
  • C.provide the excitation the machine requires at starting
  • D.discharge the capacitor safely when the drive is switched off

Answer: B

An uncharged capacitor looks like a short circuit to the rectifier, and the resulting surge would damage the diodes and trip the supply. A resistor shorted out by a contactor once the voltage has risen is the usual arrangement.

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