I think it has to do with the misplacement of the sensors. I can't remember, It was ten years ago, but think the controller has to see either the one in the software of the position count before the sensor in the shaft, or vice versa. I think I moved the sensor in the shaft. But something also kind of has me thinking that you can change the position count slowdown in the software to get the same result. This is just a guess at the moment from an old memory. I will dig through my manuals and check to see what that is.