The electrical / refrigeration part of the constant temperature and humidity test box is faulty, as shown in the following table:
Fault diagnosis table for electrical appliances
Grasp the fault phenomenon Fault check sequence and removal measures The alarm light turns on after power-on The phase sequence alarm light turns on ①Is the power supply normal? The power supply is out of phase, or the three-phase voltage asymmetry ≥50V is regarded as abnormal power supply, which should be normal. ② The phase sequence of the power supply is wrong. Arbitrarily exchange the two-phase phase sequence of the power supply. ③ The phase sequence protector is damaged, replace the phase sequence protector. Over-temperature alarm light is on ①Is the over-temperature setting lower than the ambient temperature? Reset the over temperature to make it higher than the test temperature value you need. ② Is the sensor short-circuited? Measure the resistance value of the sensor, and replace the sensor if there is a short circuit. ③Replace the over-temperature protection device can not turn on the working power supply ①The crimping end of the main circuit contactor has bad contact, re-crimping. ②The working power switch is damaged, so it can be replaced. The blower is not running normally. The fan blades in the working room do not rotate. ①Manually rotate the blower motor shaft and do not rotate. Replace the motor. ②The crimping wire related to the motor is loose and crimped again. ③ Measure the motor winding resistance to open or short circuit, and replace the motor. ④ The starting capacitor capacity of the motor is insufficient, replace the capacitor. ⑤ The motor overload protector is damaged, replace the overload protector. There is abnormal noise in the working room. ①The wind blade is loose, and re-tighten the wind blade. ② If the product is left for too long, the noise of the motor bearing lacks oil, and high temperature resistant lubricating grease is added. The display of the control instrument is abnormal. The display of the instrument displays a fault indication "------" ①The input terminal of the instrument is loose, and reconnect the pressure. ②The sensor is damaged, replace the sensor. The instrument shows a large deviation between the temperature (wet) degree and the working room temperature (wet) degree. ①The input end of the instrument's input signal is loose and reconnect the pressure. ② Set the meter correction parameter by mistake and reset to 0. ③ The sensor is damaged, replace the sensor. ④ If the meter is damaged, replace the meter. The temperature (humidity) cannot be controlled normally. The output indicator (OUT) of the instrument is on, but the displayed value has not changed. ①The pressure wire related to the heater (humidifier) ​​is loose and re-pressed. ②The heating (humidification) actuator (solid state relay) is damaged. Replace the solid state relay. After the display value of the instrument reaches the set value, the overshoot is large and the fluctuation is large. The heating (humidification) PID parameters of the meter are not applicable. Please use the AT auto-tuning parameters in the meter to automatically calculate the PID value by the meter. Refrigeration system fault diagnosis table
Grasp the fault phenomenon Fault check sequence and measures for overpressure alarm light on Water-cooled unit â‘ Water supply cooling system inlet pressure is too low, flow is too small. â‘¡ If there is ice or oil clogging in the refrigeration system piping, professionals should be asked to repair it. Air-cooled unit â‘ Condensation evaporator heat exchange â‘¡ Refrigerating system pipelines have ice blockage or oil blockage, should be repaired by professionals. No cooling If you check the instrument settings are correct, you should ask a professional to repair. Under the same conditions, the cooling time is getting longer and longer. The refrigeration system suffers from "anemia", and the refrigerant cannot be added blindly. Professionals should be asked to check and repair the refrigeration pipeline.
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