What are the common faults of refrigerator compressor starter?

The common faults of refrigerator compressor starter are as follows: the relay thread is loose and falls off, and the connector is seriously worn; There is a buzz when starting the machine; The voltage is too high or too low; Improper matching between starter or thermal protector and compressor; Motor winding short circuit, etc.

The specific explanation is as follows:

1, the relay thread is loose and falls off, and the connector is seriously worn.

When the starting relay fails, the compressor will fail to operate, the starting capacitor cannot be cut off from the circuit after starting, or the compressor cannot be started after the normally closed contact is disconnected before starting.

When the overload protection relay fails, it will make the air conditioner unable to work normally, because the relay wire is loose and falls off, the contact is worn or welded, it is too dirty and uneven, and the coil is short-circuited or open-circuited. ?

2. It starts in just a few seconds and there is a buzz.

For the compressor using the starting relay, when the compressor can't start due to the "buzzing" sound, check whether the contact of the starting relay is good. The main fault of relay is that the elastic force of reset spring is weakened, and the contact is closed when starting, so it is difficult to jump off. The starting current adjusting screw can be adjusted. If the adjusting screw is not easy to twist, you can use flat pliers to pull the spring outward until the adjustment is normal.

3. If the voltage is too high or too low, the compressor vibrates frequently.

When the voltage is too high, the current through the starter increases accordingly. When the current exceeds the allowable range, the starting contact can not release the starting winding and can not be disconnected. In general, the starting winding of 1s should be disconnected after the motor starts. If you can't disconnect, you are in danger of being burned.

4. The starter or thermal protector does not match the compressor.

If the starting current of the compressor motor is too small than that of the normal starter, the starting contact will not be released, and the thermal protector will quickly jump off, resulting in the compressor not operating normally. For example, the capacity of the heating element of the thermal protector is very small, even if the temperature gradually rises to the point where the contacts jump.

5. The motor winding is short-circuited or the moving parts inside the compressor are stuck, which makes the current overload when the motor works, thus making the overload protection contact of the starting relay act repeatedly.

References:

Baidu Encyclopedia-Start Relay

Baidu Encyclopedia-Compressor-Common Faults