Hello
im using PIDE in rslogix 5000 - mode is DEPENDENT. im using it to control the temperature, via burners.
im having some problems with adjusting P,I,D, parameters. Temperature im working currently is around 900(setpoint), when i have a set of tubes coming in, making the whole thing cooler, temperature goes to 870 or something, while this is going on, output of PID is maximum and its a good thing, but, when the tubes are leaving and the temperature starts to raise, from 870 to 880 to 890 and finally 900 the output of the PID is not going down, its still maximum when the temperature is 899(1 to setpoint), temperature is raising relatively fast(10 degrees in 20 seconds), and because of that i have overshot. i've been trying to change derivative factor to see what will happen but output is doing jumps like -5 +3 -2 +1, its not smooth. is there a way to make it go down smoothly while temperature is rising?
around 890 for it to be 90%, 891 87% or something like that?
current factors are
DEPENDENT MODE - P = 5, I = 0.08333, D = 0.03333
im using PIDE in rslogix 5000 - mode is DEPENDENT. im using it to control the temperature, via burners.
im having some problems with adjusting P,I,D, parameters. Temperature im working currently is around 900(setpoint), when i have a set of tubes coming in, making the whole thing cooler, temperature goes to 870 or something, while this is going on, output of PID is maximum and its a good thing, but, when the tubes are leaving and the temperature starts to raise, from 870 to 880 to 890 and finally 900 the output of the PID is not going down, its still maximum when the temperature is 899(1 to setpoint), temperature is raising relatively fast(10 degrees in 20 seconds), and because of that i have overshot. i've been trying to change derivative factor to see what will happen but output is doing jumps like -5 +3 -2 +1, its not smooth. is there a way to make it go down smoothly while temperature is rising?
around 890 for it to be 90%, 891 87% or something like that?
current factors are
DEPENDENT MODE - P = 5, I = 0.08333, D = 0.03333