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Autotuning status goes to "not done" after power off. Why does not it stays in "done" ATV320

On ATV process and ATV machines, the autotuning state goes always to "not done" when the drive is switched off. But motor data measured by previous autoutuning are stored in the drive, so no need to worry. ATV keesp the tuned motor data untill new autotuning or manual modification of motor data is done.