• d, Derivative time. The unit is in seconds. Derivative action contributes the output power
based on the rate of temperature change. Derivative action can be used to minimize the
temperature overshoot by responding its rate of change. The larger the number is, the
faster the action will be, e.g. when the door of oven is opened, the temperature will drop
at very high rate. The derivative action change the controller output based on the rate of
change rather than the net amount of change. This will allow the controller to act sooner.
It will turn the heater to full power before the temperature drops too much.
• AT, Auto-tuning. Every type of cooker has its own unique set of tuning parameters. For
heating stability, it should have programmed with the tuning parameters for the cooker
currently being used.
You should always write down your old PID parameters, before auto-tuning the controller.
So if something goes wrong, you can always restore your previous PID parameters.
Basically, you must setup your cooking system close to your actual cooking environment.
E.g, the water you use for auto-tune should be the same as your normally use.
To activate auto-tuning, please set AT to 1; then exit the menu. The display will start to
flash alternately between AT and the current reading temperature, indicating the
auto-tuning is in progress. When the display stops flashing, the auto-tuning is finished.
The newly calculated PID parameters are set and ready to use. The new parameters will
store in the memory even when the controller is rebooted.
The duration of auto-tuning depends on how fast the system is responding to the heating
and cooling cycle. If the temperature of the cooker takes a long time to drop when the
heater is off, the auto-tuning could be a very long tuning process, such as a well-insulated
cooker. The auto-tuning should be able to tune most of your chosen
heaters/smokers/cookers with great results.
• t, cycle rate. The unit is in seconds. This unit determines how long for the controller to
calculate each action. For example, if T is set to 10 seconds, when the controller decides
the output should be 10%, it will turn on the heater 1 second for every 10 seconds. This
parameter should set at 2 second for heating with an electric heater. When controlling a
solenoid valve or a compressor of refrigerator, the T should be set to 10-20 to reduce the
frequency of on/off.
This group of parameters can be accessed by input code 166. Figure 6 is the flow chart that
shows how they can be changed. Press and hold SET key for 3 seconds until LED displays
“LoCK.” Then release the SET key. The display will show “0”. To get into parameters setting
mode, you need to key in the pass code. Use “+” and “-“keys to adjust the display to 166 and
press SET. The LED will show “P” for a second and then its P setting value, Use “+” and “-” keys
to change the setting. When finished, press the SET again to confirm the change. The display
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