Discussion
Safe torque off differs from switching off the supply in that it
Answer: D
Correct answer: leaves the dc link charged
Safe torque off removes the gate drive signals so that the inverter cannot produce torque, but it does not disconnect the supply or discharge the link, which remains at several hundred volts. It is therefore a safeguard against unexpected movement and not an isolation: work on the power circuit still requires the supply to be locked off.
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