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A drive fitted with a functional safety input allows

  • A.the dc link to be discharged instantly at any time
  • B.the drive to run without any protection settings
  • C.torque to be removed reliably without a contactor
  • D.the machine to be held at standstill with full torque

Answer: C

Certified circuitry inhibits the gate drives by two independent channels, which achieves a safe torque-off without the maintenance and wear of a main contactor. Holding a load, by contrast, still needs a mechanical brake.

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