I've taken what you guys have suggested and thought of the following solution.
How about if i have PID 1:
Setpoint: Pressure
PV: Pressure sensor
CV: Airflow rate (min and max limited)
PID 2:
Setpoint: CV from PID 1
PV: Airflow from blowers
CV: % speed of blowers
Do you think this would work? Would tuning be difficult?
Something I see to have forgotten to mention earlier is that I have 6 blowers connected in parallel, feeding 4 valves which are controlled by their own DO sensor PID loop.
How about if i have PID 1:
Setpoint: Pressure
PV: Pressure sensor
CV: Airflow rate (min and max limited)
PID 2:
Setpoint: CV from PID 1
PV: Airflow from blowers
CV: % speed of blowers
Do you think this would work? Would tuning be difficult?
Something I see to have forgotten to mention earlier is that I have 6 blowers connected in parallel, feeding 4 valves which are controlled by their own DO sensor PID loop.