Question about the dual C value when tuning tool heater
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Using the new heater tuning algorithm (firmware 3.2), I note that when tuning a heater by using the "T" parameter (rather than the "H" parameter), I end up with two colon separated "C" values as opposed to single value when tuning just the heater (without an associated tool). It seems obvious that the second C value is related to the additional "thermal load" that is applied when the fan is running. But it seems that the heater tuning only runs the fan(s) at full speed.
So my question is, does the PID control switch between those two values when the fan is on or off, or does it interpolate between the two values depending on fan speed?
The reason I ask is that my part cooling fans are quite powerful and I only ever run them at full speed when printing with a large diameter nozzle and am extruding a high volume of molten plastic. For "normal" printing, that amount of cooling air is far too much and I generally run the fans at only around 30% speed. So if the algorithm switched between the two "C" values, then it would over compensate when the fans are only running at 30% (as is the case for most of my prints). Whereas if it interpolated between the values in proportion to fan speed, that would be a accurate compensation of load.
Is it a) fairly clever because it compensates for the fan turning on, or b) very clever because it compensates proportionally with fan speed?
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@deckingman said in Question about the dual C value when tuning tool heater:
So my question is, does the PID control switch between those two values when the fan is on or off, or does it interpolate between the two values depending on fan speed?
It interpolates.