In my acs560 drive, in pid control mode, when my set point and feedback is gone same my drive is go to the 0 rpm.
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it seems you have a process set point close to or equal to 0 rpm, you should give some more indication or post a copy of your program for analysis. With the little information you have provided, it is not possible to give you more help BR Flavio
You should block the minimum Setpoint to drive to avoid going to zero or share the PiD setting
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