shanamischelle
Member
Hi,
I have a system (see attached illustration) that is PID controlled. The pump is used for the injection of chemical from the tank to the boiler drum. The speed of the pump injection depends on the conductivity in the boiler drum (there is a 10mins. delay in the change in conductivity).
(There are 2 pumps, one pump is operational while the other one is on standby mode)
I have read lots of threads here about pid tuning and nothing seems to work when i tested it. My output is still unstable with my PV(conductivity) fluctuating.
I also attached my test program.
I have a system (see attached illustration) that is PID controlled. The pump is used for the injection of chemical from the tank to the boiler drum. The speed of the pump injection depends on the conductivity in the boiler drum (there is a 10mins. delay in the change in conductivity).
(There are 2 pumps, one pump is operational while the other one is on standby mode)
I have read lots of threads here about pid tuning and nothing seems to work when i tested it. My output is still unstable with my PV(conductivity) fluctuating.
I also attached my test program.