What would be a reason to adjust the analog input bias or analog input gain on an ATV212 drive?
Adjustment to the bias and gain of the ATV212 drive.
All models and serial numbers
One reason for changing the analog input bias and gain is that the speed reference signals may not be linear.
Example: If the drive is being sent a speed reference of 4mA signal with low speed (LL) at 0 hz but the drive runs above 0 hz. parameter F470 can be adjusted down so that the drive runs at 0 hz. Or, on the upper end of the 4-20mA scale if the drive is being sent 20mA and the frequency only goes to 59 hz parameter F471 can be adjusted up to that the speed reaches 60 hz.