text: <s>[INST] PF40 - Ref Speed w pot With PF40, I use pot for speed reference.With a time ( 4 years) my reference lower ≈ 48 HzI change my drive, the speed reference is OK, with same wiring and a same config. I don't know if this case is documented? [/INST] Do you mean the embedded potentiometer on PF40 or a remote potentiometer ? Anyway, I didn't find documents on that, just I may suspect some dust inside potentiometer has changed its resistance value during years... it is a plausible possibility I think... :smileysurprised: - fuzzy logic \\n </s>