Semuel
Member
Hi,
Have problem with getting PID to work. Have been using 4x different programmers on siemens, not one could make PID to work as I want.
Problem is I need PID to control biofuel furnace master power. Idea is that such furnace has quite big inertia and irregularity on process.
Usually I use Allen Bradley and there it is easy (or programmer is great).
When PV gets close to SP AB already starts to drop out put and it is possible to fine tune that output temperature is in +/-1c to 2c.
With siemens it is always like maxing out and dropping power only after SP reach. And then I get overheated output on boiler...I can tune how fast PID dial up or down, but not how fast/far from setpoint it starts to do it.
Can anyone can give some directions so I can push plc programmer on right direction?
Have problem with getting PID to work. Have been using 4x different programmers on siemens, not one could make PID to work as I want.
Problem is I need PID to control biofuel furnace master power. Idea is that such furnace has quite big inertia and irregularity on process.
Usually I use Allen Bradley and there it is easy (or programmer is great).
When PV gets close to SP AB already starts to drop out put and it is possible to fine tune that output temperature is in +/-1c to 2c.
With siemens it is always like maxing out and dropping power only after SP reach. And then I get overheated output on boiler...I can tune how fast PID dial up or down, but not how fast/far from setpoint it starts to do it.
Can anyone can give some directions so I can push plc programmer on right direction?