T
I am using a SLC 5/04 to control a process. All went fine during our commissioning except for 1 of our PID control. Our client wants the process to have at least +/- 0.4 error (in a scale of 10). There are two PIDs in the tank. One for the level and one for the pressure. This is a closed tank and the medium is steam. My level control is quite okay now except for the pressure control that goes beyond or below 0.4 of the SP(setpoint is 3.7 bar and my PV will sometimes at 4.1 to 4.5 or below 3.1 or 2.9). The controller output goes to a steam valve. Anyone who can help me fine tune the process? My current P=1.7 and I=0.1. If I increase my I, it can hardly control my output and it overshoots. I am not using a D at the moment.
Please help.
Ting
Please help.
Ting