Flow controller FIC sends an output between 0-100% to a Flow control valve FCV to throttle a pump discharge flow.
The existing FCV is straight forward, Valve will be closed at 0% output and open at 100% output.
I want to use a VSD as the final element to control flow instead of the FCV. My question is which motor speed corresponds to a 0% Flow controller output to VSD?
Should it be :
1. 0 RPM @ 0% --> Flow is stopped.
2. The minimum RPM for motor @ 0% ? (a minimum RPM prevents motor overheating)
In this case, the flow is not stopped because the minimum RPM is not not zero, so I have to figure a way out to stop the flow.
P.S. I am a beginner.
The existing FCV is straight forward, Valve will be closed at 0% output and open at 100% output.
I want to use a VSD as the final element to control flow instead of the FCV. My question is which motor speed corresponds to a 0% Flow controller output to VSD?
Should it be :
1. 0 RPM @ 0% --> Flow is stopped.
2. The minimum RPM for motor @ 0% ? (a minimum RPM prevents motor overheating)
In this case, the flow is not stopped because the minimum RPM is not not zero, so I have to figure a way out to stop the flow.
P.S. I am a beginner.