Is it possible to save reference on ATV312 drive when using "+/- speed" function.

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Yes, it is possible.
Associated with the "+/- speed" function, this parameter can be used to save the reference:
• When the run commands disappear (saved to RAM)
• When the line supply or the run commands disappear (saved to EEPROM)

Program Parameter Str [Reference saved] => [No] No saving
=> [RAM: Saving in RAM
=> [EEprom] : Saving in EEPROM