Head fan not controlled (e.g. not even started) during auto PID tuning

[derbroti]

During the autotune the head fan is not controlled - the only place the fan is controlled is in manage_heater() which is not called during the for(;;) loop of the auto tune.

See: temperature.cpp:554 and temperature.cpp:208

This is a problem as well for the UM2.1 repo.

Current workaround is to preheat the head before starting the PID auto tune

[daid]

Word of warning, the PID autotune doesn't produce proper results for the UM2 line of printers.

[derbroti]

line as in including the 2+?

[daid]

Yes, UM2, UM2go, UM2extended, UM2+, UM2+extended

[derbroti]

Can you elaborate on where the issue is, that it does not produce good values? I have a friend who works in the area of control systems that I wanted to asked to look at the auto tune.

[daid]

Repeated runs are all over the chart in values, and the resulting values usually do not work very well and cause a lot of overshoot.