How to solve the over-temperature fault in the high and low temperature test chamber, Shanghai Linpin Instrument Co., Ltd. provides you with the following troubleshooting methods:
1. Check whether the AU1 indicator of the over-temperature protector is on. If it is on, it indicates that the temperature in the box exceeds the upper limit alarm value (HIAL) or lower limit alarm value (DIAL), and then check whether the set value is correct (below the control Temperature and temperature 10 degrees), if the setting value is incorrect, modify the setting value, if the setting value is correct, it may be caused by the following reasons:
1. The fan of the test chamber does not rotate or the solid-state relay breaks down, and the heating tube has been heated all the time resulting in overtemperature;
2. The sensor is damaged;
3. The thermostat itself is damaged;
2. Check whether the solid-state relay is damaged. In the case of no power, use a universal meter to measure whether the input and output terminals are conductive. If it is conductive, it proves that the solid-state breakdown, otherwise it is not conductive. Observe the solid-state relay on the power. Whether the continuity indicator is on, and if so, (use the voltage range of the multimeter to measure whether the output terminal (pin 1) of the solid-state relay has a 220V voltage to the N line, if not, then check the contactor, if Yes, then measure whether the output terminal (pin 2) of the solid state relay has a 220V voltage to the N line. If not, it means that the internal open circuit of the solid state relay is damaged and must be replaced.
3. Check whether the temperature sensor is damaged, remove the three wires (A +, B +, B-) of the sensor first, and use a universal meter to measure the resistance. When measuring a good sensor, two of them (B +, B-) should be connected. , The resistance of (A +) and any of the other two (B +, B-) should be about 110Ω, otherwise prove that it is damaged, replace it (if the thermocouple is input, measure whether the two wires are connected) ).
4. Check whether the fan rotates, the detection method is as follows:
1. Put the machine into operation, open the door, and observe whether the air drum is running; if the air drum does not rotate, it is possible that the air drum and the motor shaft are stuck, cut off the power, open the shutter frame, and turn the air drum by hand to test whether it is better . Please carefully observe whether there are obstacles around it, and if there are, remove the obstacles.
2. Eliminate the above situation and check whether the motor is damaged. Use a multimeter to measure the resistance of both ends of the axial motor circuit. The resistance of a normal axial motor is normal within the scope of the following figure. Otherwise, it proves to be damaged and can be replaced. How to solve the over-temperature fault in the high and low temperature test chamber
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