The hottest three position regulation and its basi

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Three position regulation and its basic principle

three position regulation is a regulation mode developed to overcome the contradiction between the heating rate and the temperature overshoot (overshoot) easily caused by two position regulation Take electric furnace heating as an example Three position regulation can use the electric shock of two relays to form three output states: temperature rise heating, constant temperature regulation and stop heating

the specific implementation method is to use two groups of heaters, auxiliary heater a and main heater B. when the measured value is lower than the lower limit setting value, the upper and lower limit relays are closed, and the system enters the heating state. At this time, the two groups of heaters a and B are heated at the same time, so the heating speed is faster

when the measured value reaches the lower limit setting value and is still lower than the upper limit setting value, the lower limit relay will be released to disconnect the energy supply of auxiliary heater a, the heating efficiency will decrease, and the system will enter the constant temperature heating state

when the relative dispersion value of China's universal tensile testing machine reaches the upper limit setting, if the lower measurement data is found to be loose, the user must not feel that the more you buy, the better the temperature rise, friction coefficient and other values. The low-temperature end face friction and wear testing machine screen shows that the end face friction and wear testing machine limit relay remains disconnected, and the upper limit relay starts to release, disconnecting the energy supply of main heater B At this time, since the main and auxiliary heaters lose energy supply, the temperature gradually decreases until it reaches the lower limit of the return difference set by the upper limit, the upper limit relay is closed again, the energy supply of main heater B is connected, and the temperature gradually rises again and again. From this, it can be seen that the three position regulation has a faster temperature rise speed than the two position regulation. After entering the constant temperature regulation state, the temperature fluctuation is small and the accuracy is high

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