I explained in the manual an empirical way to set the PID.
Note: that fine tuning of the PID parameter is out of the scope of this user manual and many factors related to the
brewing system can influence the optimal setting.
For a more detailed explanation of PID control algorithm please refer to Wikipedia
A simple method to get an easy calibration of the PID algorithm suggests to set to 0 the value Ki and Kd and try to fine
tune only the Kp that allows the PID to get as close as possible to set point trying to minimize the difference between
actual temperature and set point.
Subsequently it is possible to tune the kI and kD considering that:
• In case the measured temperature overshot the set point reduce kP and Increase kD
• In case to much time is needed to get the controller to the set point increase kI
• In case of a permanent error below the set point increase kI
Since version 6.2.65 kI has been re-proportioned and is now worth 0.25 compared to the value of the previous versions, this is because I noticed an overly aggressive attitude of this parameter to changes in a single unit.
As already explained the other changes from previous versions are:
MANUAL MODE: You can switch the timer in a countdown acting simultaneously on buttons START + ENTER and setting the time with the UP and DOWN buttons. Repressing START + ENTER to activate the countdown
SET PID: was placed the duration of the sampling cycle to 3500ms and rescaled the value of kI (0.25) in order to have a more precise control of this constant.
During configuration must be rescaled by multiplying the old value by 4.
SET UNIT: two configurations have been added that allow you to check the status of Remove Malt and Iodine Test.
- Remove Malt: you can set the temperature control (ON/OFF) only to systems with internal temperature sensor
- Iodine Test: You can set the maximum execution time of the extra time (max 90 min) after which the system automatically advances to the next step; it is always possible to manually move forward step.
Setting the time to 0 min (OFF) user intervention is required for the advancement of the step.
CAUTION: For proper operation, proceed to configure the unit in its entirety before you perform any of the brewing cycle.
Then I promise you that as soon as I get time I will update the manual