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Does the ATV61 have backspin protection?
Altivar 61 ATV61
The load forces the motor to backspin.
The drive can be prevented from commanding the motor to run in reverse, but there is no way to stop the motor from spinning backwards if that's what the load is trying to do.
Incorporate a mechanical system to prevent backspin. An anti-reverse ratchet is the most common device type.