text: <s>[INST] Power Flex 40 Speed transition Hello All, I have a turn Table that is driven by a 1 hp motor controlled from a Powerflex 40. The Turn table is 18 feet in diameter.After all four stations are complete, the VFD is told to Run at the preset frequency of 60 Hz. During the rotation @ approximately 11sec, a prox switch is flagged that changes the preset frequency to 10Hz for a slow down and finally the stop prox switch is flagged and engages stop. During the slowdown process the turn table appears to stop (Jerk) and then continue on at the 10Hz speed. How can I ease the transition between the selectable presets? More info: The selection of the preset is controlled by 3 inputs to 5, 6, 7 on the terminal strip. The purpose was to have 4 selectable speeds and a slowdown speed to ease the stopping of this massive turn table. Suggestions are appreciated. [/INST] You will need to closed vector using a Powerflex40P with encoder feedback from the motor. With the large diameter the gearing would cause alot of back pressure onto the motor shaft when decelerating. \\n </s>