What are the common faults of inverter compressor controller

Release Time:

2022-06-08 09:24

The use of air conditioning is becoming more and more popular. When in use, also need to understand some air conditioning inverter compressor controller maintenance common sense and skills. For some common fault repair methods, the following will explain to you:

1 inverter compressor controller wiring problem

Inverter drives have polarity requirements. The three terminals of the compressor are wired according to the signs on the main board, gasket and compressor cover, and according to the wiring diagram. The wiring sequence must not be reversed and the wiring must not be loose, otherwise unpredictable consequences will occur.

2. High pressure problem of inverter compressor controller:

The large-capacity aluminum electrolytic capacitor on the main board of the external machine and its parallel devices (PFC, IPM, voltage dividing resistor, etc.) are all high-voltage devices above 380 volts., It takes several minutes or even ten minutes to complete the discharge. Before the discharge of these devices is completed, the human body can not touch it, otherwise the electric shock will endanger personal safety.

Therefore, the electrolytic capacitor is discharged as follows at the time of maintenance. After the discharge is completed, before maintenance, please use the DC gear of the multimeter to test the voltage between the two points of the discharge position to confirm the completion of the discharge and prevent incomplete discharge due to slow discharge or poor contact, resulting in abnormal clicks.

3 inverter compressor controller heating problem:

Current frequency conversion is all designed for thermal grounding. The ground of weak current part (detection and control output part) is not isolated from the strong current part. The ground of weak current control part is not safe either. People will get electric shock! Therefore, the human body cannot contact the weak current portion at the time of the charging operation.

4 inverter compressor controller and compressor matching problem:

The same type of inverter may correspond to a variety of compressors, inverter control depends on the specific parameters of the compressor motor. But different specifications of inverter compressor parameters are inconsistent. Therefore, when replacing accessories, be sure to ensure that the electrical box and the compressor one-to-one correspondence. Otherwise, it may cause problems such as compressor failure to start, module protection, and out-of-step operation. In addition to coding differences, some models also have labels on the fan capacitors.

5. Parts test problems before replacement of inverter compressor controller:

Before replacing the external controller accessories of the frequency converter, confirm that it is a qualified product before replacement, so as to avoid the failure of the replacement motherboard itself and affect subsequent maintenance. The tests to be performed are as follows:

Test whether two of the three pins of the IGBT are short-circuited. If so, you cannot use an external motherboard.

Test whether the DC bus P and N are short-circuited. If so, you cannot use an external motherboard. Test whether there is a short circuit between U, V, W and P and between U, V, W and N. If any of the six tests is short-circuited, the motherboard cannot continue to be used.