QM67 Dual Boiler Espresso Machine
Owner’s Manual Page 9
Advanced PID Settings
Warning - This section allows the user to change the machine from Fahrenheit to Celsius mode
as well as other advanced settings that can greatly affect the performance of the machine.
These settings have been calibrated using specialized test equipment and should not be
changed unless the user has a thorough understanding of how a PID controller operates.
To get into the advanced programming
mode, with the machine turned off hold
down both arrow keys and then turn the
machine on. Keep holding the arrow keys
until the display reads F.01 and then
release the keys.
Use the down arrow key to cycle through
parameters and then use the up arrow key
to select a parameter to change. Then use
the arrow keys to change the selected
parameter.
To save the new changes turn the machine off and then back on again.
PID Basic Theory - The PID calculation algorithm involves three separate constant parameters,
the proportional, integral, and derivative values. These values can be interpreted in terms of
time: P depends on the present error, I on the accumulation of past errors, and D is a prediction
of future errors based on the current rate of change. These 3 settings work together to
determine when and how to apply power to the heating element to allow for a more precise
temperature control. It is not recommended to change the PID settings unless you have a
thorough understanding of how a PID controller operates. To learn more about PID controllers
visit the following link.
http://en.wikipedia.org/wiki/PID_controller
Offset - The coffee boiler offset setting has been calibrated using a special Scace device and
should not be changed. The steam boiler offset setting is set to 0° by default. It can be changed
up to 5° to increase the steam pressure, but the pressure may vary at higher elevations so make
sure it does not exceed 2 bars of pressure.
Note - The PID controller and heating lights will turn off when the reservoir is empty.
F.01
Coffee Boiler Temperature
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