1 Composition and principle of thyristor temperature controller
Temperature measurement and control are the measurement and output of the thermocouple collecting signal through the PID temperature regulator 0 to 10mA or 4 to 20mA control the trigger board control the size of the thickest corner of the thyristor. In the set temperature working state. Thyroid temperature controller is composed of the main loop and control loop. Tamper-proof Thermostat The main circuit is composed of thyristor, over -current protection fast fuse, overvoltage protection RC, and heating elements of the resistor furnace.
The control loop is composed of DC signal power supply, DC work power supply, current feedback link, synchronization signal link, trigger pulse generator, temperature detector, and PID temperature regulator.
2
The main parameters of the thyristor:
(1) The rated voltage
Repeat the peak voltage U. : When the door is cut off and the temperature is the rated value, the forward peak voltage that is repeatedly adds to the device is allowed. Repeated peak voltage: When the door is cut off and the temperature is the rated value, the reverse peak voltage that is repeatedly adds to the device is allowed. Usually, the label value of the thyristor and the smaller standard value is used as the rated voltage of the device. When selecting, the rated voltage should be left with a certain amount of margin. Generally, the rated voltage is 2 to 3 times the peak voltage of the crystal gate tube.
(2) The rated current
In the cooling state of the environmental temperature of 40 ～ C and specified, the stable knot temperature does not exceed the average of the maximum industrial frequency sine semi -wave current allowed by the rated knot temperature. When use, the use of the actual current and the average current of the general state should be selected to select the a certain amount of margin. Generally, it should be taken from 1.5 to 2 times.
3 Installation and operation
Because the main circuit current of the thyristor temperature controller is relatively large, it is very important to choose the appropriate line and cable diameter line, and it is necessary to ensure the reliable connection of the line to prevent the load short -circuit cutting. The current mutation is more easily damaged. When the furnace is opened, it must be manually adjusted to slowly rise the current, and the current should be turned off when the furnace is closed.
4 Application of Thyric Devil Temperature Controller
Selecting excellent refractory materials such as high -grade alumina, refractory fiber and light brick furnace body are the key parts. The temperature control equipment provided by electric heating elements such as silicon molybdenum rods and silicon carbon rods is controlled by the temperature control equipment of the heat source. The furnace condition is stable, and the control effect of the furnace temperature has significantly improved in real time and control accuracy. After using a computer and PCI bus control, a computer can control multiple resistance furnaces at the same time, which not only achieves automatic program control, but also can display the functions of records and alarms at multiple temperatures. Change can upgrade the traditional equipment. In this way, the equipment management work is automated, and the maintenance and maintenance of the equipment is relatively simple.