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2. Common Fault Troubleshooting and Solutions
(1) Air Compressor Fails to Start
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Check Power Supply: Ensure that the power cord is firmly connected, and the socket and switch are not damaged. Use a multimeter to check whether the power supply voltage is normal (the voltage of single-phase air compressor should be 220V±10%, and that of three-phase air compressor should be 380V±10%). If the voltage is abnormal, it is necessary to check the circuit problems (such as replacing the damaged socket, contacting an electrician to repair the circuit).
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Check Motor: If the power supply is normal, check whether the motor has abnormal noise and overheating. If the motor does not run and has no response, it may be that the motor winding is burned or the capacitor is damaged. The motor needs to be disassembled for inspection, and the burned winding or damaged capacitor should be replaced; if the motor has abnormal noise, the bearing may be worn, and a new bearing should be replaced.
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Check Pressure Switch: When the pressure inside the air compressor exceeds the set value, the pressure switch will automatically cut off the power supply to prevent equipment overload. If the pressure switch fails (such as contact adhesion, spring failure), it may cause the equipment to fail to start. The pressure switch needs to be disassembled, the contacts cleaned or a new pressure switch replaced.
(2) Pressure Fails to Reach Set Value
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Check for Air Leakage: Turn off the air compressor, and after the pressure is stable, apply soapy water to the air pipe joints, valves, pressure gauge interfaces and other parts. If bubbles appear, it indicates air leakage. Tighten the joints or replace the damaged seals (such as O-rings, gaskets).
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Check Piston Ring/Sealing Ring: If there is no problem in air leakage inspection, the piston ring or sealing ring inside the air compressor may be worn or broken, leading to gas leakage. It is necessary to disassemble the cylinder head, check the state of the piston ring and sealing ring, and if damaged, replace them with new parts and ensure good sealing during installation.
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Check Intake Valve: If the intake valve is stuck, blocked or the valve opening is insufficient, the intake volume will be reduced, affecting the pressure rise. After turning off the power, disassemble the intake valve, clean the impurities in the valve body, check whether the valve can be opened and closed flexibly, and if the valve is damaged, replace it with a new one.
(3) Excessive Noise During Operation
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Check Foot Bolts: If the air compressor is not placed stably or the foot bolts are loose, vibration noise will be generated during operation. Adjust the equipment position to ensure the body is horizontal, and tighten the foot bolts with a wrench.
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Check Motor Bearings: When the motor bearings are worn or lack of lubrication, harsh friction noise will be generated. Disassemble the motor, check the bearing state, replace the bearings if they are seriously worn; if there is insufficient lubrication, add special motor bearing grease.
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Check Cylinder and Piston: If the cylinder inner wall is worn, the piston pin is loose or the piston ring is broken, impact noise will be generated during operation. Disassemble the cylinder parts, check the wear of relevant parts, replace the damaged parts, and reassemble and debug.
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