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    Causes of refrigeration compressor coil burnout and cleaning method after burnout

    Causes of refrigeration compressor coil burnout and cleaning method after burnout There are many reasons for the burning of the compressor coil, and we have successively summarized many reasons before. Today I will talk about two reasons that are often forgotten. In addition, some friends are asking, after the compressor burned out and replaced with a new compressor and then damaged, why this problem occurs, this article also has related instructions. 1. AC contactor The AC contactor is one of the important components in the motor control circuit. Unreasonable selection can destroy the best compressor. It is extremely important to select the contactor correctly according to the load. The AC contactor must be able to meet demanding conditions such as fast cycling, continuous overload and low voltage. They must have a large enough area to dissipate the heat generated by the load current, and the selection of contact materials must prevent welding under high current conditions such as starting or blocking. The contactor must meet the following requirements: 1) The contactor must be able to close at 80% of the lowest nameplate voltage. 2) When using a single contactor, the rated current of the contactor must be greater than the rated current of the motor nameplate, and at the same time, the contactor must be able to withstand the motor stall current. 3)When two contactors are used, the sub-winding locked rotor rating of each contactor must be equal to or greater than the compressor half winding locked rotor rating. Other needs to pay attention to: 1. The rated current of the contactor cannot be lower than the rated current on the compressor nameplate. Contactors with small specifications or inferior quality cannot withstand compressor start-up, stalling and high-current impact at low voltage, and are prone to single-phase or multi-phase contact jitter, welding or even shedding, causing motor damage. 2.A contactor with jittering contacts will frequently start and stop the motor. The motor starts frequently, and the huge starting current and heat will aggravate the aging of the winding insulation layer. At each start, the magnetic torque causes the motor windings to move slightly and rub against each other. If there are other factors, it is easy to cause short circuit between windings. In addition, jittery contactor coils are prone to failure. If the contact coil is damaged, it is easy to appear single-phase state. Here, we emphasize again that when the motor burns out, the contactor must be checked. After the contacts of the AC contactor are stuck, the compressor will work regardless of whether the main board has an output or not. If the "naked streak" is not protected for a long time, damage to the compressor is an inevitable. When replacing the compressor, you must find the cause of the compressor damage, and you must check whether the AC contactor is normal, whether there is phase loss and adhesion. It is impossible to replace only the compressor without investigating the cause, which will inevitably lead to the secondary damage of the newly replaced compressor. Second, the power supply phase loss and abnormal voltage Abnormal voltage and phase loss can easily destroy any motor. The range of power supply voltage cannot exceed ±10% of the rated voltage, and the voltage imbalance between the three phases cannot exceed 5%. High-power motors must be powered independently to prevent low voltages when other high-power equipment on the same line starts and runs. The motor power cord must be able to carry the rated current of the motor. If the compressor is running when a phase loss occurs, it will continue to run but will have a large load current. The motor winding will quickly overheat, and the compressor will be thermally protected under normal conditions. When the motor winding is cooled to the set temperature, the contactor will be closed, but the compressor will not start up, there will be locked rotation, and enter the "locked-thermal protection-locked rotation" dead cycle. In order to prevent the compressor from running out of phase, the three-phase compressors are equipped with phase sequence protectors. The phase sequence protector has two functions. One is to prevent the reverse operation of the wrong phase sequence compressor; Phase operation. The difference in motor windings is very small now, and the difference in phase currents when the three-phase power supply is balanced can be ignored. In an ideal state, the phase voltage is always equal, as long as a protector is connected to any phase to prevent damage caused by overcurrent. It is actually difficult to ensure the balance of the phase voltage. The motor power cord must be able to carry the rated current of the motor. If the compressor is running when a phase loss occurs, it will continue to run but will have a large load current. The motor winding will quickly overheat, and the compressor will be thermally protected under normal conditions. When the motor winding is cooled to the set temperature, the contactor will be closed, but the compressor will not start up, there will be locked rotation, and enter the "locked-thermal protection-locked rotation" dead cycle. The method of calculating the percentage of voltage unbalance is: the ratio of the maximum deviation between the phase voltage and the average value of the three-phase voltage and the average value of the three-phase voltage. For example: the nominal 380V three-phase power supply, the voltage measured at the compressor terminal is 380V, 366V, 400V. The average value of the three-phase voltage is 382V, and the maximum deviation is 20V, so the percentage of voltage unbalance is 5.2%. As a result of voltage imbalance, the load current imbalance during normal operation is 4-10 times the percentage point of voltage imbalance. In the previous example, a 5.2% unbalanced voltage may cause a 50% current unbalance. The National Electrical Manufacturers Association publication on motor and generator standards states that the percentage of phase winding temperature rise caused by unbalanced voltage is approximately twice the square of the voltage unbalance percentage point. In the previous example, the number of voltage unbalance points is 5.2, and the percentage increase in winding temperature is 54%. The result is that the one-phase winding is overheated and the other two windings have normal temperatures. Third, the treatment method after the compressor burned out If the compressor has been burned or mechanical failure or wear has caused the inevitable pollution of the refrigerant system, if the system is not treated, the new compressor is directly replaced, and it will burn out after one month or several months of operation. Approach: If the system oil is slightly scorched and discolored, the system piping is still clean, but in the system where the metal surface has been acidified, the inner wall of the copper tube becomes red. You can install a new dryer after installing a new compressor, and add nitrogen pressure to 10K for leak detection. The leak-proof is eliminated by the high and low pressure ends, and the high and low pressure ends are evacuated at the same time. If the system oil and refrigerant smell, scorch, spicy, black oil, such as black ink, the tube is full of dirty black film, and there will be moisture. Disconnect the dryer and short-circuit this part to a copper pipe joint or a temporary detachable pipe. The cleaning agent (trichloroethane, methylene chloride) is pumped into the pipeline system from the high-pressure pipe by a chemical pump for cleaning Circulating flow.

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