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Thanks Damian, I will have a play with it and report back.

I have changed to the Beta firmware 7.4.4.1092. for the power profiling so not sure how this will work with your zone 1 settings? it says on the log Firmware 7.3.12.1062

Or should I just reflash back to the old firmware?

Hi Damian,

Would you like to share the log file for that last roast on the right. Does this have the straight line fan profile?

RoR looks pretty good and its matched with a power profile that has smooth overall gradient.

Cheers

Excellent Chris, i think this will useful for bracketing problem areas ( briefly taking control from PID) and is likely to work better than just negative or positive boosts alone.

I'm a bit doubtful that this would be advantageous, Well, I am delighted to be proved wrong - very impressive results. The power line goes flat and I can see potential advantages in being able to specify a power line gradient during the zone? Oooh now you are getting very tricky! Yes i think that w...

Another alternative is for the heat to be locked or held to prevent it changing for a portion of the roast. This would prevent the control system from dropping the heat if the roast went above the line, and from increasing the heat if the roast went below the line. I'm a bit doubtful that this woul...

This could be a use case for a 'power step' feature that enables you to increase power by a defined amount at a defined time? Or maybe even a full heater power priority controlled profile, like what traditional roasters do. This would be really interesting to play with. As mentioned chopping and ch...

Those Rati hartmann have always been a super crashy coffee, should see what happens in a drum roaster!

Hey Ben, I have see ROR and temp curve display the same behavior mostly when the fan profile (too low) is not a good match for roast profile. Particularly if the roaster is hot from high ambient temps and or back to back roasts this problem can be exacerbated. Given you say there are some scorched b...

This is the kind of profile shape I have been working with the last month. Keeping the profile lines straighter giving more distinct "roast zones" the fan profile is pretty much the same as the original Brazil file but the end is adjusted for extended roast times. Level 4.5 is around 2nd c...

At a glance of the picture that seems about right starting point. Then it's a matter of seeing what happens and adjusting again until it behaves / good enough. If that does not do it then you can try -3, -4. My preference is Max of + or - 5 and if that does not do it then I will move onto using zone...