PID auto tuning for a slow System

Troubleshooting
1

Hey guys,
I am using the PID library and the PID-AutoTune library to tune a system which is slow temperature monitoring system. It takes about 1 and half hours to get to set temperature.

When I am using the library it stops tuning after a few minutes and set the variables.
I have basically changed nothing in the library and using the example in the library to tune it. I have change the input ( to my temp probe) , setpoint to my target temp , the output to my heatsource and the gain values to my manual tune values.

To those who have used the library previously could you give any input into how I could tackle this situation.

Thanks in advance

2

What tuning parameters are you giving your system on the scale aggressive to conservative?

When you say ‘slow temperature system’ can you explain this a bit more. How long would you expect or want the system to get to the set temperature?

Could you post the application code you are using - it helps others to understand or spot things that are wrong.