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The compressor is not operating and there is a "buzzing" sound. Then, overload protection occurs.
In this kind of fault situation, the compressor makes a "buzzing" sound but fails to start and operate normally. This essentially is a protective action triggered by excessive starting current.
Voltage issue: Low voltage applied to the compressor is one of the common causes of such faults. On one hand, the supply voltage of the power grid itself may be too low, failing to provide sufficient starting voltage for the compressor. On the other hand, there may be poor contact or too thin wire diameter problems in the user's power supply line. Poor contact will increase the resistance of the line, and too thin wire diameter will reduce the current-carrying capacity of the line, thereby triggering protection actions.
Internal faults of the compressor: Failure or short circuit of the starting capacitor, open circuit of the starting winding, partial inter-turn short circuit of the running winding, as well as problems such as compressor seizing the shaft or jamming the cylinder, all can cause abnormal increase in the starting current of the compressor. Failure or short circuit of the starting capacitor will affect the starting torque of the compressor, preventing it from starting normally; Open circuit of the starting winding or partial inter-turn short circuit of the running winding will change the electrical parameters of the compressor, resulting in excessive starting current; Seizing the shaft or jamming the cylinder of the compressor will cause mechanical operation of the compressor to be obstructed, requiring a larger starting current to overcome the resistance, thereby causing the protection relay to act.
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