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What is the use of Encoder input [PG], if encoder card has been inserted & PG is assigned to Fr1 on ATV71 drive.

When Fr1 is programmed to [PG] Encoder Input; It means that encoder which is installed somewhere on mechanism & this encoder will give a reference value for ATV71, when it will be rotated and  then motor driven by ATV71 will be rotated with the same speed.
It is the same principle as Electronic Gearing; the motor driven by ATV71 will rotate with a speed according to the reference provided by the encoder.
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