pauly
Member
I am looking to trim the speed of an ABB ACS800 drive via an analogue input. That is the main reference comes into the drive via thye Profibus interface and the larger the analogue input gets, the more the speed reference is modified(reduced). I have set up a test drive and utilised the "trim" function in the drive which works perfectly in one direction but not when the drive runs reverse. I set the PID function block with a maximum of 0 and a minimum of -100%, so that for zero analogue input the PID saturates with zero output. As I said this is fine for positive or forward direction but not reverse. Any body with any ideas or similar experience?
Suggestions welcome
Suggestions welcome