Mabrill Posted October 20, 2010 Report Share Posted October 20, 2010 Hi i have a problem with a PID for temperature. The control have an error of 3 C and more: an the answer is to slow. we use a ramp but the controller do not follow it. The cv is to small and the system begin to cooling. We have been used many autotunning with a PID server but the problem is the same. How i can solve this issue? Quote Link to comment Share on other sites More sharing options...
Emil Posted October 21, 2010 Report Share Posted October 21, 2010 Which model of contgroller you're using? Can you try Autotune - on fixed Setpoint - recommended the higher one (end of Ramp) or 10% lower. I'll recommend using Autotune of the controller itself. It's very useful to make logs with PID server. Then, you can post them for our review or send ot support@unitronics.com. If you're using Vision controllers, I'll recommend ot add in Ladder the module "Read Contgrol components"- with coeficient 100. This will give you CVp, CVi and CVd, where CV = CVp + CVi + CVd. Quote Link to comment Share on other sites More sharing options...
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