Fault 1: The device does not display after powering on
Solution(s):
First of all, check whether the terminals of the device have been connected to the neutral live wire, and make sure that the neutral live power supply can work normally. Then start to check whether the cable between the LCD motherboard and the device drive power supply is loose, and relevant tightening measures need to be taken. Pay attention to whether the switch of the thermostat is turned on and meets the specified standards. When wiring the temperature controller, it is necessary to check the voltage and current related to the wiring power supply in advance.
Fault 2: The device display is normal, but there is an error during control
Solution(s):
First of all, you need to check whether the cable of the device is connected well and whether the contact is good. Next, you need to check that the cables are connected correctly.
Fault 3: The device has a deviation in temperature detection
Solution(s):
First of all, you need to use the calibration data that the device has previously made for the temperature, and then re-measure it and compare it. Check whether the sensor configured on the device is faulty. To see if the installation location does not meet the specified standards and is not suitable for the detection of relevant temperatures, it is recommended to improve the installation environment.
Fault 4: Heating for a period of time, the temperature does not change. Displays the ambient temperature of the site at all times (e.g. room temperature 2°C)
Solution(s):
First of all, check whether the SV value setting value is set, whether the OUT indicator of the meter is lit, and whether the No. 3 and No. 4 terminals of the meter are 12VDC output with the "multimeter". If the light is on, terminals 3 and 4 also have a 12VDC output. This indicates that the problem is with the control device of the heating element (e.g.; AC contactors, solid-state relays, relays, etc.), check whether the control device has an open circuit, whether the device specification is wrong (such as a 380V device connected to a 220 circuit), and whether the circuit is connected to the wrong one. Check the sensor for short-circuits (the meter always shows room temperature when the thermocouple is short-circuited).
Fault 5: After heating for a period of time, the temperature display is getting lower and lower
Solution(s):
This kind of fault is generally the positive and negative polarity of the sensor is reversed, and the input terminal wiring of the instrument sensor should be checked (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).
Fault 6: After heating for a period of time, the temperature value (PV value) measured by the instrument is very different from the actual temperature of the heating element (for example, the actual temperature of the heating element is 200°C, and the meter shows 230°C or 180°C)
Solution(s):
First of all, check whether there is any loose contact between the contact point between the temperature probe head and the heating element, whether the temperature measurement point is selected correctly, and whether the specification selection of the temperature sensor is consistent with the input specification of the temperature controller (for example, the temperature control meter is input of K-type thermocouples, and the J-type thermocouple is installed on site to measure the temperature).
Fault 7: The PV window of the meter displays HHH or LLL characters.
If such a fault occurs, it means that the signal measured by the meter is abnormal (LL is displayed when the measurement temperature of the meter is lower than -19°C, and HHH is displayed when the measurement temperature is higher than 849C)
Solution(s):
If the temperature sensor is a thermocouple, you can remove the sensor and directly use the wire to short the thermocouple input terminals (8 and 9 terminals) of the instrument, if the meter can display the room temperature normally (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 specifications of the sensor are inconsistent with the instrument.
If all of the above problems are ruled out, the internal temperature measurement circuit of the meter may be burned due to leakage of the sensor.
Fault 8: The control is out of control, the temperature exceeds the set value, and the temperature has been rising.
Solution(s):
First of all, check whether the OUT indicator of the meter is lit at this time, and whether the No. 3 and No. 4 terminals of the meter are 12VDC output with the DC voltage level of the "multimeter". If the lights are not on, there is no 12VDC output at terminals 3 and 4. This indicates that the problem is with the control device of the heating element (e.g.; AC contactors, solid state relays, relays, etc.).
Instantly check whether the control device has a short circuit, the contact cannot be opened, the wrong line is connected, etc.
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