Pero2912
Junior Member level 1
Hello guys,
I'm beginner in automatics and could use your advice.
So, I'm designing a PID regulator for oven and right now I'm trying to tune the Kp, Ki and Kd parameters. The oven has nice step response that gets easily approximated by the PT1 system with the dead time delay.
The system to which oven corresponds is :
\[\frac{1.1 }{420s+1 }\cdot\exp(-150s)\]
When I try to design PID components I use Ziegler Nichols Method which turns out to be bad. I use step response where rising time is 420sec, delay time 150s and K=1.1. The PID coefficients I get are somewhere around Kp = 2, Ki = 0 and Kd = 225. Happily I tried to simulate the closed loop and got -- disaster. What am I doing wrong? What is going bad with calculation? How would you tune this PID?
I'm beginner in automatics and could use your advice.
So, I'm designing a PID regulator for oven and right now I'm trying to tune the Kp, Ki and Kd parameters. The oven has nice step response that gets easily approximated by the PT1 system with the dead time delay.
The system to which oven corresponds is :
\[\frac{1.1 }{420s+1 }\cdot\exp(-150s)\]
When I try to design PID components I use Ziegler Nichols Method which turns out to be bad. I use step response where rising time is 420sec, delay time 150s and K=1.1. The PID coefficients I get are somewhere around Kp = 2, Ki = 0 and Kd = 225. Happily I tried to simulate the closed loop and got -- disaster. What am I doing wrong? What is going bad with calculation? How would you tune this PID?