Vesuvius Pressure Profiling Machine - General Discussion

tocateclas Then it can expand when heated and push in some place the brew circuit causing the issue? If this was the case I’m quite confident in this is what happens in these machines.

No, this won’t be happening, during a shot everything is open if HX is on and that hydraulic pressure caused by heating water becomes a non-issue, it also causes no pump back pressure.

DavecUK Thank you. Sorry for my English… I meant if this hx has some contact with the brew circuit when hx is off.

tocateclas I meant if this hx has some contact with the brew circuit when hx is off.

You need to read my earlier post about the theory of what might be happening because I am sure you have misunderstood it.

I am not concerned about any leakage to the sealed brew circuit as such in the way you mean…I’m worried about the pump trying to overcome Hydraulic pressure due to water expansion behind a non return valve.

Can anyone with this machine tell me what their is like as I think I’m loosing it.

I am under impression the steam boiler pressure drops lower and recovers much slower during steaming than it used to. I had it set at 125c and recently found I had to increase to 127c which is still not whatnot should be.

I flush and wait for it to come back to 127c before starting to steam. Only 160ml milk in the pitcher.
It falls to 122c before you notice it starting to recover although you can hear the boiler kick in around 125c.

I hope it’s just my mind playing games but I am convinced it wasn’t like that.

prezes Check your advanced settings because it sounds as if the steamboiler is behaving more like a PID control than on/off control. You need to set the PID parameters for the steamboiler to behave like an/off controller.

DavecUK thanks @DavecUK . These are the settings at the moment:

prezes if that’s settings for the steam boiler, change them to kP =20, kI=0 and kD= 0

is there an associated B setting for the steam boiler?

DavecUK I’m sorry Dave I had to double check. The above are brew boiler settings.

Steam boiler:

DavecUK thanks a lot. I will test tomorrow and report back

So it definitely acts differently. I’ve got it set at 126c yet it goes up to 128c and then slowly comes back to 126c. When steaming it still falls but now not lower than 123c

prezes Which is exactly what you want

DavecUK yes, it seems to behave mich better now. Thanks for your help Dave.

Looking as this issue that Prezes was experiencing, it seemed a bit familiar, as I’ve noticed my steam pressure and temp not being able to sustain itself in a way that I remember. My steam boiler PID settings were exactly what his was (as they are the default from the factory according to the manual). I made the changes that Dave suggested and it definitely helped retain the temp and pressure throughout the steaming of milk. Thanks Dave!!!

Given that it helped, it does make me curious why the default settings were letting the PID control it via its algorithm vs just a binary on/off.

sketchy I second that as was meant to ask the same thing. What makes me wonder as well is why does this develop with time and is not an issues that is there on new machine with the original settings.

sketchy

That’s good to know

If by any chance you have time please @DavecUK it would be good to get your thoughts on the “best” settings

Below are what was set on my V1 and V2 Evo

No actual current issues I’m aware of, just curious 😻

prezes Doing a bit more investigation on this, against what the default settings were (especially P & D), I’m suspecting the default PID settings paired with the capabilities of the boiler (size vs the mount it is heating) are to help prevent a more severe oscillation that may occur with the new settings. But I’m thrilled with being able to maintain steam boiler pressure better.

DavecUK Most certainly. Let me check when I have a chance. Thanks Dave.