MorphuisOGrady
Member
Hi there,
This is my first time tuning a PID for flow. I have some experience with level and temperature.
Anyway heres what I've experienced. A pump is running in Manual from SCADA. The operator enters a speed reference of about 93% for the delivery pump. Tjis will achive a flow rate of about 65MLD which is the desired flow.
When I switch to PID control as the setpoint is achieved the output from PID is 0%, and pump backs off and the flow drops drastically.
The PID then increases output and the flow does not increase under the pump is at about 85%, next BANG....the flow is back over 65MLD and pumps stops.
Essentially I have ON/OFF control. I appreciate you cant tell for sure but is the flowmeter causing problems? Its almost as if the flowmeter wont give a reading until the pipe is full.
Any advice would be great
This is my first time tuning a PID for flow. I have some experience with level and temperature.
Anyway heres what I've experienced. A pump is running in Manual from SCADA. The operator enters a speed reference of about 93% for the delivery pump. Tjis will achive a flow rate of about 65MLD which is the desired flow.
When I switch to PID control as the setpoint is achieved the output from PID is 0%, and pump backs off and the flow drops drastically.
The PID then increases output and the flow does not increase under the pump is at about 85%, next BANG....the flow is back over 65MLD and pumps stops.
Essentially I have ON/OFF control. I appreciate you cant tell for sure but is the flowmeter causing problems? Its almost as if the flowmeter wont give a reading until the pipe is full.
Any advice would be great