Vibiemme Domobar Super
Love / Delta 32B PID Parameters
.0625 T thermocouple immersed in boiler
When I originally set up the PID, optimized it for maximum boiler stability. After a few months it became clear that maximum boiler stability is not optimum for an HX when making several shots in quick succession.
Updated Brew Mode
Set 234°F
P = 0.5°F
I = 180 seconds
D = 4 seconds
IoF = 0% *
Pd = 0.5sec
Original Brew Mode
Set 234°F
P = 7.6°F
I = 90 seconds
D = 15 seconds
IoF = 8.5% *
Pd = 0.5sec
HX Steaming Mode [Now Used as pStat controls Steam mode]
Set 250°F
P = 2.0°F
I = 0 seconds
D = 0 seconds
These parameters were determined by manual tuning according to this document
* this parameter is normally set by auto tune. When the system is stable, this is a default percentage output to maintain the set point. In practise, this parameter is only useful when the machine is idle for a long period. When pulling shots, the system is not stable, so the PID parameters are used to adjust the output percentage.