Discussion
A resistor bank is provided on a regenerative drive to
Answer: D
Correct answer: absorb energy when the supply cannot take it
A regenerative drive returns braking energy to the supply, but the supply may not always accept it - an isolated or lightly loaded network, or a supply failure at the moment braking is called for. The resistor and its chopper give the energy somewhere to go, so the dc link voltage cannot run away and braking remains available regardless of what the network is doing. On a hoist that is a safety requirement rather than a convenience.
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