I have tuned numerous PID loops in position controllers so I understand the basics of PID control but I am far from an expert. In positioning loops, when the target is in position, the error is zero and there is zero output to the servo valve.
I have an upcoming application where I have to use a PID loop to control flow. The controller is a SCL 5/05 with a VFD controlling the pump and a flow meter for feedback. My question is that in this situation, when the SP is near maximum, the PID output must be near maximum also to get the pump running at the required speed. If the error is close to zero, does the PID control use the I term alone to give the output or is some other method required to get the output to near maximum.
Thanks
I have an upcoming application where I have to use a PID loop to control flow. The controller is a SCL 5/05 with a VFD controlling the pump and a flow meter for feedback. My question is that in this situation, when the SP is near maximum, the PID output must be near maximum also to get the pump running at the required speed. If the error is close to zero, does the PID control use the I term alone to give the output or is some other method required to get the output to near maximum.
Thanks