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Analysis and Treatment of Several Common Faults of Screw Compressor

Time: 2019-12-13 16:25:50


1. The exhaust temperature of the unit is too high (over 100 ° C), and the lubricant oil level of the unit is too low (it should be seen from the oil level indicator, but not more than half).
The oil cooler is dirty, it depends on the temperature difference between the oil inlet and the oil outlet, the normal temperature difference is between 20-30 degrees. If the external dust is blocking the heat dissipation gas, please clean by compressed air. If it can't be blown off or the inside of the radiator is dirty, it needs to be cleaned by professional cleaning agent (such as heavy oil cleaning agent, copper propionate, polyester dust, and etc.), such as If the radiator is blocked internally, it needs to be cleaned with a clean water pump. If the water-cooled radiator is blocked, the best way is to remove the front and rear end covers and clean the inside of the copper tube with iron bars.

2. High oil consumption of unit or high oil content of compressed air.
-Too much lubricating oil, the correct level should be observed when the unit is loaded, and the oil level should not be more than half at this time.
-The oil return pipe is blocked.
-The installation of oil return pipe (distance from the bottom of oil separation element) does not meet the requirements.
-The exhaust pressure is too low when the unit is running.
-Broken oil separation element.
-The partition board inside the oil gas tank is damaged.
-Oil leakage.
-Deterioration or overdue use of lubricating oil.
-Over temperature.

3. Pressure too low.
-The actual compressed air consumption is greater than the unit output air delivery.
-Release valve failure (unable to close when loading).
-Intake valve failure. -To high ambient temperature, and the air filter is blocked.
-Load solenoid valve fault. -The minimum pressure valve is stuck.
-Leakage of user network.
-Pressure setting too low.
-Pressure sensor failure.
-Pressure gauge failure (relay control unit).
-Pressure switch failure (relay control unit).
-Air leakage of pressure sensor or pressure gauge input hose.

4.Exhaust pressure too high:
-Intake valve failure.
-Load solenoid valve failure.
-Pressure setting too high.
-Pressure sensor failure.
-Pressure gauge failure.
-Pressure switch failure.

5.Current too large:
-Voltage too low.
-Loose wiring.
-The unit pressure exceeds the rated pressure.
-The oil separation element is blocked.
-AC contactor failure.
-Air end failure.
-Main motor failure.

6. Compressor fails to start:
-The fuse is broken.
-The temperature switch is broken.
-Loose wiring.
-The main motor thermal relay acts.
-Fan motor thermal relay acts.
-The transformer is broken.
-No power input.
-Failure not eliminated.
-Controller failed.

7. Large current or trip when the compressor is started:
-User air switch problem.
-Input voltage too low.
-The interval time of star delta conversion is too short (should be 10-12 seconds). -Hydraulic cylinder failure (not reset).
-Intake valve failure (too large opening or stuck).
-Loose wiring.
-Air end failure.
-Main motor failure.
-1TR time relay is broken (relay control unit).

8. Fan motor overload:
-Fan deformation.
-Fan motor failure.
-Fan motor thermal relay failure (aging).
-Loose wiring.
-The cooler is blocked.
-High exhaust resistance.

For more technical support, please feel free to contact Kotech compressor team.

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