text: <s>[INST] PF753 - adjusting accel time Hello, I would like to increase the acceleration time on PF753 to see if this can minimize the overshooting when the machinery swtich over to other damper. The current setting on 753 is 1. Accel time 1 & 2 : 90 & 80 Hz 2. Decel time 1 & 2 : 90 & 80 Hz 3. Jog Acc Dec time : 80 Hz What are the differences between accel 1 & 2? Shoul I adjust varialbes for decel according to accel time? how about jog time? Currently, preset speed are assigned through 1~7 (12~10~20~22~40~50~60). what are these variables? is it something to do with accel time 1 and 2? The accel time switch over to other when it reaches the certain stage of preset speed? Thank you in advance, it will help me a lot [/INST] You should have a copy of the 750 programming manual: http://literature.rockwellautomation.com/idc/groups/literature/documents/pm/750-pm001_-en-p.pdf Page 107 gives definitions of parameters 535 through 538. Accel / Decel 1 & 2 are selected using either a digital input or a logic command from a network or devicelogix. Jog 1 and Jog 2 are chosen the same way. If you're not switching between accel / decel 1 & 2, then all you need to vary is Accel 1 and Decel 1. The preset speeds are also selected using digital inputs or logic commands via network. The accel and decel times are in seconds, not Hz. is 90 seconds ramp-up time normal for your application? May I suggest you upload the DNO file for this drive instead of the Excel file with just an image of it? Use the software you used to get the image (DriveExecutive) and upload it here. We'll be able to give you a better idea what's going on. \\n </s>