text: <s>[INST] Powerflex 525 and 753 two sets of variable speeds Hi, this is my first post on here so please be gentle! I have a machine that we perform size changes on and the drives (powerflex 525 and 753) speeds are controlled by linear potentiometer, currently at a size change we change the minimum and maximum frequency settings to give us the speed range required. I would like to add a two position switch to change the frequency's for two different sizes. With the 753 am I correct at thinking I can use parameters 547, 548, 552 and 553 to allow this? I cannot see similar parameters on the 525 so could I use the jog facility to achieve this by having one range of frequency's when in run and a different range in jog and would they both work on the 0-10v potentiometer? Or is there an easier/better way to achieve this? Thanks in advance for any advice. [/INST] Hello, you are very welcome. There are some technical notes available from the Rockwell Knowledgebase that could help with the task ahead. For example for the PowerFlex 753 drive PowerFlex 753: Configuring 2 preset speeds using 1 Digital input can be useful. For the PowerFlex 525 drive PowerFlex 520 series drive: Using Different Preset Speed Values with 2 Wire Control can also help. Both papers above assume the frequency to be switching between fixed values (preset frequencies) stored on parameters on the drive. This could be an easy way to do it. \\n </s>