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cabinet temperature and set temperature stays constant, the output will be doubled after
1000 seconds. Integral action is used to eliminate temperature offset. Larger number
means slower action. E.g. assuming the difference between the measured and set
temperature is 2 degrees and remain unchanged, the output will increase continuously
with time until it reaches 100%. When temperature fluctuate regularly (system oscillating),
increase the integral time. Decrease it if the controller is taking too long to eliminate the
temperature offset. When I = 0, the system becomes a PD controller. For very slow
response system such as slow cooker and large commercial rice cooker, set I = 0 will
significantly reduce the temperature overshoot.
Note 8. 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 stronger the action will be. For example, when the door of oven is opened,
the temperature will drop at very high rate. The derivative action changes 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.
Note 9. T:
Control Cycle Time. The unit is second. This unit determines how long for the
controller to calculate each action. e.g. If T is set to 10 seconds, when controller decide
the output should be 10%, it will turn on the heater 1 second for every 10 seconds. This
parameter should be set at 2 second for heating with an electric heater.
Note 10. Auto-tune:
This parameter can be used to initial the auto-tune process. Set
Auto-tune to ON then press SET key to confirm. Once exit (in normal display mode), the
display will flash alternately between normal display and auto-tune notification (Auto-
tuning Please wait…), which indicates auto-tuning is in progress. When the display stops
flashing, the auto-tuning process is finished. Now, the newly calculated PID parameters
are set and are used for the system. The new parameters will store in the memory even
the power is off. To cancel the current auto-tuning process, please set this parameter to
OFF. For more information about auto-tune, please see section 10.
Note 11. Save & Recall Recipes:
This controller can save up to 6 pieces of smoking
recipe (programs). Each recipe file can have up to 6 steps (C-1 to C-6). For convenience,
we have pre-named these 6 pieces of recipe files as B1 (beef), B2, C1 (chicken), C2, F1
(fish), F2. These recipe files are all the same except their names, so you can store your
special recipe to any of them. These recipes can be stored in the memory of the controller
even when it is powered off. You can overwrite the exist recipe with a new one.
