Master the common problems of several common intelligent temperature controllers, and solve them by yourself when you encounter problems, and you don't need to spend time and effort to find someone to repair, the common problems are as follows:
1. Heating for a period of time, the temperature does not change. Ambient temperature (e.g., room temperature 25°C) is displayed at all times
In case of such problems, the first thing to check is whether the SV value setting value is set, whether the OUT indicator light is lit, and whether the No. 3 and No. 4 terminals on the surface are 12VDC output with a "multimeter". If the light is on, terminals 3 and 4 also have a 12VDC output. then indicate that the problem is with the control equipment of the heating element (e.g.; Communication contactors, solid-state relays, relays, etc.), check whether the control equipment has an open circuit, whether the equipment standard is wrong (such as the 220 circuit is connected to the 380V equipment), whether the line is connected to the wrong and so on. In addition, check whether the sensor is short-circuited (when the thermocouple is short-circuited, the appearance always shows room temperature).
2. After heating for a period of time, the temperature appears to be getting lower and lower
In case of such problems, the positive and negative polarity of the sensor is generally reversed, and the wiring of the input terminal of the sensor should be checked at this moment (thermocouple: 8 to the positive pole, 9 to the negative pole; PT100 RTD: 8 to monochrome wires, 9 and 10 to two wires of the same color).
3. After heating for a period of time, the temperature value (PV value) of the external measurement is very different from the actual temperature of the heating element (for example, the practical temperature of the heating element is 200 °C, and the appearance is 230 °C or 180 °C)
In case of such problems, the first thing to check is whether the contact point between the temperature detector head and the heating element is loose and other poor contact, whether the temperature measurement point is selected correctly, and whether the standard selection of the temperature sensor is the same as the input standard of the temperature controller (for example, the temperature control meter is a K-type thermocouple input, and the J-type thermocouple is installed on site to measure the temperature).
4. The PV window on the surface shows HHH or LLL characters.
In the case of such a problem, the signal indicating the appearance measurement is abnormal (LLL is displayed when the surface measurement temperature is lower than -19 °C, and HHH is displayed when the surface measurement temperature is higher than 849 °C).
Solution: If the temperature sensor is a thermocouple, you can remove the sensor, directly use the wire to short the thermocouple input terminals (8 and 9 terminals) on the surface, if the appearance can normally show room temperature (on-site ambient temperature such as: 30 °C), then the problem lies in the temperature sensor, use a multimeter tool to detect whether the temperature sensor (thermocouple or PT100 thermal resistance) has an open circuit (broken wire), whether the sensor wire is reversed, wrong, or the standard of the sensor is not the same as the appearance.
If the above problems are eliminated, the temperature measurement circuit on the surface and inside may be incinerated due to leakage of the sensor.
5. The control is out of control, the temperature exceeds the set value, and the temperature keeps rising.
In case of such problems, the first thing to check is whether the OUT indicator light is lit at this moment, and use the DC voltage level of the "multimeter" to measure whether the No. 3 and No. 4 terminals on the surface have 12VDC output. If the light is not on, there is no 12VDC output at terminals 3 and 4. then indicate that the problem is with the control equipment of the heating element (e.g.; Communication contactors, solid state relays, relays, etc.).
Solution: Check whether the control equipment has a short circuit, the contact cannot be opened, and the wrong line is connected in real time.
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