buongiorno a tutti.
i started to project this machine in the 2013 and i started to promote in the 2015, there was a lot of researce, tests and at that age no other domestic machine had a profiling. Now everyone could experiment some issue somotime very strange and somtime the cause was an incorrect use.
I would like to explain first that the 2 boilers are indipendent, there is only a pre-heating that even if there is a pressure in the HX due of steam heating as soon as you lift the lever all the pressure go away in less than 1 second and nothing can raise the pressure except the pump.
the machine that i got was checked from one of our workers and even if he didn’t find any abnormal symptoms he changed the pressure sensor just in case but the result was the same, unfortunately the trade show in Milan keep me a bit busy but in the end i have found some spare time to test with Dave.
My approch was different than Dave because i focalize the test on the different pressure or over pressure with the steam off or on and Dave focalized the test to find the correct pid setting to get the closest pump response to the profile selected.
Of course my first test was a straight 9 bars profile, tuned the pid i had always 9 bars without any over pressure with steam on and off, than i tuned the machine to get a curve that follow the setting. I have to say that with the latest firmware in the pump it’s a bit nervous that’s why i suggest to use different parameters if someone use a standard profile preinfusion + flat straight bar profile or a variable profile.
of course we have tested with blind filter, pf with variable tap and coffee, all our test are reported the same results.
of course Dave have a different vision about using a single pid parameters instead of me and change the profile to get the right one as desidered, i prefer to tune as i prefer the pid.
Now i understand that someone complain that there is a problem, i cannot check how the test was made at this point i suggest to make a test with a blind filter in order to avoid any problems with different dose of coffee or tamping or whatever and simulate the problem with and without the steam boiler, if this is the issue.
about the temperature inside of the machine that can affect some electronic components, first of all i have to say that in our machines there isn’t more parts than a standard machine except for the pressure sensor that we buy from Switzerland and rated for high temp even if work on a colda side of the system. The main board its the same like others used in some professional machines for years with some different hardware confiuguration and we never found problem about riability.
if someone would like to come and test with me i’m open at any time.
there is no reason for me to hide a problem even because i sold many Vesuvius machine and it’s very strange that only few sold also in different time had this strange problem. I’m happy that Dave test himself the machine because i believ in his professional integrity not considering our friendship, when something it’s wrong he always report to me.
if someone want to test this problem i suggest to put KP a 1, KI 0 and KD 35 the pump acc 800 straight 9 bars with blind filter and report if there is a difference with steam boiler on and off.
thank you.
Paolo