[ATR243] PID regulation to control valve with analog output
Posted: 04/12/2015, 16:55
Hello,
I have ATR243 in application - PID with analog output. ATR243 controls pneumatic analog valve (medium is Steam so reaction is quite fast)
1. Does 'cycle time 21.' in this application is time how fast this valve gets from closed to open?
2. In this application I tried auto tuning multiple times and I get different values for PID controller (ID where quite similar all the time, but P changed a lot form ~8...40) Is there a correct time when activate auto tuning or some correct way in general?
3. There where 2 similar processes for one auto tuning worked very good, for second - controller always fluctuated its output for few % when temperature was reached.
I have ATR243 in application - PID with analog output. ATR243 controls pneumatic analog valve (medium is Steam so reaction is quite fast)
1. Does 'cycle time 21.' in this application is time how fast this valve gets from closed to open?
2. In this application I tried auto tuning multiple times and I get different values for PID controller (ID where quite similar all the time, but P changed a lot form ~8...40) Is there a correct time when activate auto tuning or some correct way in general?
3. There where 2 similar processes for one auto tuning worked very good, for second - controller always fluctuated its output for few % when temperature was reached.