I'm trying to control air pressure to brakes on a unwinding roll of paper. I have a dancer with a 0-10 v signal going to the plc. Also a pressure transducer measuring the brake pressure. The dancer should stay around mid point.
From mid to full back the air to the brakes is at a set minimum
from mid to full forward the air to the brakes increases linear to max.
I scaled the dancer pot input and the air to brakes input.
I then subtracted the air to brake from the dancer pos. After scaling
these should be linear. The result would be my error.
process variable = error
control variable = analog out to brake proportional valve.Now the dancer is very erratic because the brakes are overreacting.
Either I am going about this the wrong way or I don't have the PID tuned correctly. The processor is an Allen Bradley slc503 and the proportional valve going to the brakes is a Herion.
Anyone have any ideas or experience with this application?
From mid to full back the air to the brakes is at a set minimum
from mid to full forward the air to the brakes increases linear to max.
I scaled the dancer pot input and the air to brakes input.
I then subtracted the air to brake from the dancer pos. After scaling
these should be linear. The result would be my error.
process variable = error
control variable = analog out to brake proportional valve.Now the dancer is very erratic because the brakes are overreacting.
Either I am going about this the wrong way or I don't have the PID tuned correctly. The processor is an Allen Bradley slc503 and the proportional valve going to the brakes is a Herion.
Anyone have any ideas or experience with this application?