Answer:
When the start button of the motor is operated, the motor starts. At this time, the motor is in reduced pressure or Y operation. During this period, the air compressor continues to be in a no-load state. The air intake side of the air compressor is highly vacuumed. The lubricating oil required for the air compressor and bearings is ensured by the vacuum in the air compressor room and the atmospheric pressure difference in the oil and gas tank. After about 2s, the motor starts to run in a delta state, the control system cuts into the full pressure state, and the air compressor intake valve opens.
When the exhaust temperature of the air compressor exceeds 100℃ or the thermal protection device of the motor is activated due to overload, the power supply will be cut off, the motor will stop immediately, and the three-way solenoid valve and the air intake valve will be closed, and the discharge valve will be fully opened to discharge the compressed air in the system into the atmosphere.