bigrthanur
Member
I have a project that I would like to improve on and would like some help with. It is a maching that sweeps forward raises to clear product and moves back to "home" product infeed.
Currently we are using a 3phase motor(powerflex 4) with an encoder for positioning going back to a compaclogix high speed counter. The system currently goes through 3 speed changes in the return cycle for speed requirements. But the speed changes are very sudden and look terriable. Tried to use an S curve but the travel is short about 3ft. and causes overtravel.
Anyway my question is I was thinking of using a PID loop to control the speed changes with the output going to a moveto statement to control the Hertz of the motor.
Would this work better or could someone suggest something else?
You will have to forgive me I am not a PLC master, I am a Robot guy. I wish they would have taken my suggestion and used a servo motor!
Currently we are using a 3phase motor(powerflex 4) with an encoder for positioning going back to a compaclogix high speed counter. The system currently goes through 3 speed changes in the return cycle for speed requirements. But the speed changes are very sudden and look terriable. Tried to use an S curve but the travel is short about 3ft. and causes overtravel.
Anyway my question is I was thinking of using a PID loop to control the speed changes with the output going to a moveto statement to control the Hertz of the motor.
Would this work better or could someone suggest something else?
You will have to forgive me I am not a PLC master, I am a Robot guy. I wish they would have taken my suggestion and used a servo motor!