2q and 4q problem

Good Morning,

It sounds like the P-Code on these drives have been changed. You can change this back by performing a 3-Button reset on the drive. (Holding the "E" , Up Arrow, and PROG button) while performing a power cycle. Upon power up you will be prompted to set the P-Code which in your case would be 2Q 725 A.

As for the issue with the motor being jerky, can you elaborate on this issue? Does the motor do it unloaded? Does this occur at low speeds? High Speeds? For this application are you running Open loop or closed loop? What Parameter did you change? Can you elaborate on what you mean when you replaced the drive with an older one and it does run anymore?

I'm refering to the current auto-tuning procedure. This can be found on Page 4-8 of the manual that can be found here: http://ph.parker.com/us/17052/en/dc-motor-speed-controllers-dc590-series