A
We have an application wherein two control valves are set up side by side so as to control two parameters in the process.
Flow Control and Pressure Control.
We used two PID controllers to control each parameter independently but saw disastorous results.
What happens is in case pressure increases, the flow gets disturbed. The PCV tries to control the pressure, but in this process, because the flow was disturbed against setpoint, the FCV tries to control the flow also.
This keeps oscillating in an infinite loop.
Same applicable for the reverse combination also (flow variations effect on pressure)
Any ideas how these parameters can be controlled. Can anyone suggest standalone controllers which can take care of controlling both the parameters?
Thanks and regards
Alok
Flow Control and Pressure Control.
We used two PID controllers to control each parameter independently but saw disastorous results.
What happens is in case pressure increases, the flow gets disturbed. The PCV tries to control the pressure, but in this process, because the flow was disturbed against setpoint, the FCV tries to control the flow also.
This keeps oscillating in an infinite loop.
Same applicable for the reverse combination also (flow variations effect on pressure)
Any ideas how these parameters can be controlled. Can anyone suggest standalone controllers which can take care of controlling both the parameters?
Thanks and regards
Alok