Auber WS Series Руководство по эксплуатации и инструкция - Страница 9

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integrated with time. 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 degree 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.

• 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 Tune.

Every type of cooker has its own unique set of tuning parameters. For the

controller to heat with stability, it should have programmed with the tuning

parameters for the cooker currently being used.

When Should the Controller be Tuned?

Auto-tuning function (it's often known as self-tuning) can automatically optimize

the PID parameters for your chosen cooking system. The auto-tuning function will

heat up your cooker then let it cool down. It will repeat this heat/cool cycle several

times. Based on the response time of the whole cooking system, the controller will

calculate and set the PID parameters for your cooker.

Before using the auto-tune function, you must set the cooking equipment up in the

exact configuration it will be used. For example, to tune a rice cooker, place the

sensor in the room temperature pot filled with water and plug the cooker into the

Figure 4