Hi everybody,
Next week seems my company wants to send me to another site to take a look into a system with DO control to aid digested bacteria.
For sure they do not expect miracles with me, (on the beginning I said I do not want to go..but..) also I do not know if I will be with them next week.. , however always I wanted to get involved with this type of control.
Anyway the complaint is that on automatic mode the fans are running much more then in manual, with same result.
System components (as I know them from report)
3 aeration tanks
Each one has two oxygen sensors (1 inlet, 1 outlet, but only one is giving measurement, as per operator choice) and a Flow Control Valve
Each FCV connected to an air pipe, with a pressure transmitter and 4 blowers with VFD keeping the pressure + one spare. I do not know if we have any air dampening tank.
As I have been told there is one PID controlling each FCV according with sensor reading, and for air pressure we have a PI controller starting in sequence all blowers.
S7-400 as controller.
Any input as to point me in right direction for learning will be more than appreciated.
Thank all in advance
Marian
Next week seems my company wants to send me to another site to take a look into a system with DO control to aid digested bacteria.
For sure they do not expect miracles with me, (on the beginning I said I do not want to go..but..) also I do not know if I will be with them next week.. , however always I wanted to get involved with this type of control.
Anyway the complaint is that on automatic mode the fans are running much more then in manual, with same result.
System components (as I know them from report)
3 aeration tanks
Each one has two oxygen sensors (1 inlet, 1 outlet, but only one is giving measurement, as per operator choice) and a Flow Control Valve
Each FCV connected to an air pipe, with a pressure transmitter and 4 blowers with VFD keeping the pressure + one spare. I do not know if we have any air dampening tank.
As I have been told there is one PID controlling each FCV according with sensor reading, and for air pressure we have a PI controller starting in sequence all blowers.
S7-400 as controller.
Any input as to point me in right direction for learning will be more than appreciated.
Thank all in advance
Marian