Common Faults and Solutions of Screw Air Compressor

Common Faults

1. High oil content at the outlet of the air compressor (under normal conditions (2-3PPM ) ), first of all, the exhaust pressure of the air compressor must be above 4Bar; use a paper cup or glass to sample and judge, it is normal to have roses on the water surface, and the oil content is too high when there is oil and water; check whether the oil level is too high and the lubricant is dirty; check whether the return pipe is blocked, eccentric or too short; check whether the check valve on the return pipe is blocked or the direction opposite; check if the return hose passes through the bottom of the rotor; check if the oil-air separator guide cover is damaged; check if the oil-air separator is damaged.
2. Air compressor head temperature is too high causing jumping machine: jumping machine caused by high ambient temperature, need to improve the ambient temperature, through a reasonable ventilation device to improve to reduce the ambient temperature; because the lubricating oil position is not normal, the standard to ensure that the lubricating oil position is normal oil cooler temperature difference is not normal, so the oil cooler should be checked. The temperature difference of the lubricating oil before and after the oil cooler must be about 18. Clean the oil cooler when the temperature difference is too low, and when the temperature difference is too high, it means that too little lubricant has passed through the cooler. Check the oil circuit for blockage. If the oil is clogged, replace the oil cooler. Check whether the thermostatic valve is working properly; check whether the fuel shut off solenoid is working properly; check whether there is leakage in the control air path of the oil distribution when the temperature is too high during unloading, and the oil pressure of the foundation is too low.
3. Oil-injected screw machines contain water in the lubricant. Unload the unit for a long time, adjust the amount of air used, increase the compressor loading time; thermostatic valve failure, thermostatic valve maintenance or replacement; cooling water temperature is too low, shall not use chilled water; water cooler leakage, repair or replace the water cooler.
4. High oil content of nozzle outlet, oil level is too high, oil enters the standard height; oil temperature is too high, check temperature control valve, cooling water, cooling water pressure, oil cooling efficiency; oil return pipe 2mm small hole blockage, unclogging; oil return pipe bending or offset, adjust or replace oil return pipe; when oil and gas separator is damaged, replace oil and gas separator.
5. Air compressor not loaded: solenoid valve will cause mechanical failure when working, determine if there is 10% control gas, if there is, it will cause unloading valve failure, carry out maintenance of unloading valve. If not, check whether there is gas leakage from the smaller pressure valve, whether the gas pipe is blocked, and whether the gas is leaking; electrical failure will occur when the solenoid valve does not operate, and the solenoid valve is damaged, repair the solenoid valve, or reconnect it due to poor contact.

Method Exclusion

1. The power is not connected; close the upper power switch to connect the power.
2. Blown fuse in control circuit; replace the fuse, find the cause and solve it.
3. High temperature shutdown caused by high exhaust temperature; solve according to "High exhaust temperature or high oil filling temperature" section, then restart the compressor.
4. Thermal overload relay is broken; correct the cause of overload and reset the thermal overload appliance.
5. Low voltage; ask the power department to check the input voltage and compare it with the voltage at the motor end. Check the cause of low voltage in this way.
6. Power supply failure; check the power supply part.
7. Loose wiring; check all wiring end points and tighten them.
8. Temperature sensor failure; check the sensor and contact with the professional for maintenance matters.
9. Transformer failure; check the transformer secondary voltage.

Solution

There are various reasons why a unit can fail, and a failure is usually not caused by one part or one factor, so the diagnosis and troubleshooting of a failure is often difficult.

The fault diagnosis and troubleshooting table is based on practical applications and extensive testing by the manufacturer. The table indicates the faults that may normally occur in the unit and the general causes of said faults, as well as how to troubleshoot them, but it is not possible to list all faults and troubleshooting methods.

Before repairing or replacing parts, a thorough and systematic analysis should be made of all possible factors generating the malfunction. When problems are encountered, careful observation should be made to find out the faults and identify the causes, and then necessary maintenance work should be carried out to avoid unnecessary damage to the unit.