How to judge the quality of the air conditioner fan? Please advise

The general air conditioner of the external motor is three wires, one is the starting winding, one is the running winding, the other is the common end, the main winding is generally the sum of the other two windings, if one deviation is too big, and the other group is not equal to the total number of main windings, indicating that the motor has a problem, generally divided into short circuit and open circuit and resistance value is too large. Generally, the maximum main resistance value of the air conditioning motor is generally about 500 ohms.

Hello, I can talk to you about your problem, please remember the current connection, and then disconnect the capacitor and the power cord connected to the capacitor, the line that is not connected to the capacitor is the common end, and the common end can be uninterrupted. Then measure separately, the resistance value of the common end to the other two ends and remember it, and then test the resistance value of the other two ends should be equal to the sum of the two resistance values just remembered, which is basically normal. This is to judge the winding, the key to your problem is to detect leakage, you use the maximum resistance of the multimeter to measure the resistance of the common end to the shell, infinity is the normal resistance is small, it is leakage, and there is leakage to trip.

Leakage can only be replaced by the motor.

1. Switch the air conditioning mode when the power is on, and the wind speed can be adjusted high and low in the refrigeration and air supply mode, and the high and low wind speed is obvious, which proves that the fan motor is normal.

2. In the case of power failure, the resistance of each winding is measured according to experience, as well as the degree of insulation of the outer skin, and the damage of the capacitor, and the change of the voltage of the power supply terminal can also be measured under the condition of power-on, so as to judge whether the fan is damaged or the problem of the control circuit.

3. Air conditioner circuit troubleshooting ideas. First power supply and then load, first strong current and then weak current, first indoor and then outdoor, first two ends and then middle, first easy and then difficult, if the indoor rock front and outdoor circuit, main circuit and control circuit fault can be distinguished during maintenance, it will make the circuit fault repair simple and concrete. For air conditioners with input and output signal lines, the short-circuit method can be used to determine the conditioner.

If the air conditioner can return to normal after adopting the above method, it means that the fault is in the outdoor unit; If the fault is not eliminated, it means that the fault is in the indoor unit. Measure whether there is AC or DC voltage on the terminal of the outdoor unit and judge the fault position. If there is AC or DC voltage on the measurement outdoor terminal, it means that the fault is in the outdoor unit; If the measurement of non-alternating coarse amp current or DC voltage is measured, it means that the fault is in the indoor circuit.

4. For the cabinet-type empty acacia regulator with large power, the fault location can be judged by observing whether the outdoor contactor is engaged. If the contactor is engaged, it means that the fault is in the outdoor unit; If there is no suction, it means that the fault is in the indoor unit. For air conditioners with fault displays, you can distinguish the fault location by observing indoor and outdoor faults**.

For air conditioner circuits that use serial communication, the waveform of the signal line measured by an oscilloscope can be used to determine the fault location. For heat pump air conditioners that do not defrost or defrost frequently, it is mostly due to the failure of the outdoor main control circuit board.