How to judge the cause of compressor leakage？

    The fault of refrigerator compressor leakage is generally due to the long-term use of the refrigerator, which makes the insulation layer of the motor windings age and fall off, resulting in leakage. A 500v/500mw megohmmeter can be used to measure the resistance between the winding and the casing, which should be greater than 2mw under normal conditions. If it is 0w, the case should be opened immediately to check whether the insulation layer of the winding lead is damaged, resulting in the exposed steel wire and contact with the case, resulting in leakage. If the above phenomenon exists, the damaged area can be wrapped with polyester film to avoid direct friction with the casing. If it is found that the insulation layer of the enameled wire has fallen off, it should be removed and re-dipped or the motor should be replaced.

     The leakage of moisture-proof wires is generally more common in refrigerators with a long service life. After the power is turned on, the overload protection relay is frequently switched on and off, the compressor cannot be started, the box is live, and there is hemp inductance when touched by human hands. The voltage of the power supply is normal, and the DC resistance of each winding of the compressor is also normal with the rx1 gear of the multimeter, and there is no obvious short circuit between each winding to the ground. Check that the temperature control circuit and lighting circuit have no obvious abnormality. At this time, it can be judged that the moisture-proof wire is aging or the insulation layer is damaged and leakage. First, disconnect the circuit connected to the wire, and measure the resistance between the two cores of the wire below 1mw (normally it should be infinite), indicating that its insulation resistance is low, and leakage occurs under the influence of external factors such as condensation, and the compressor cannot operate normally. , The protection relay starts and stops repeatedly. At this time, the moisture-proof wire can be covered with insulating sleeve. It is best to remove the old wire and replace it with a new wire with rubber insulation.