Reasons for the tripping of screw air compressor units due to high exhaust temperature

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I. Fault phenomenon: It is likely that during the operation of the unit, the exhaust temperature exceeds 100°C, which triggers the unit’s protection mechanism. II. Cause analysis. 1) Insufficient amount of lubricating oil, incorrect specification of lubricating oil ； 2) Insufficient cooling water volume and high cooling water temperature ； 3) The fuel cut-off solenoid is not powered or its coil is damaged ； The diaphragm of the fuel cut-off solenoid valve is cracked or worn out ； 4) The ambient temperature exceeds the specified range ； 5) Oil cooler clogged ； 6) For air-cooled air compressors, there are issues such as faults in the cooling fan motor and damage to the cooling fan ； Reasons such as blocked exhaust ducts or high exhaust resistance (back pressure) ； 7) Thermal control valve failure ； 8) Clogged air filter ； 9) Oil filter clogged, lubricating oil supply control valve open degree is low, resulting in insufficient oil flow ； 10) The temperature switch shows a fault. III. Elimination methods. 1) Check the oil level; if it is below level L, stop the vehicle to add oil to level H, and check the oil type to replace it with the appropriate oil ； 2) Check the temperature difference between the inlet and outlet water pipes, and check the inlet water temperature ； 3) Maintenance and replacement ； 4) Increase exhaust ventilation to lower room temperature ； 5) Check the temperature difference between the inlet and outlet water pipes; the normal range is around 5~8°C. If it is greater than 9°C, there may be a blockage in the oil cooler’s pipelines, while if it is lower than 5°C, it could be due to scale buildup on the walls of the oil cooler. In such cases, the pipes should be removed and cleaned using chemicals or brushes ； 6) Repair and replace the cooling fan; clean the exhaust ducts if they are blocked or if there is high resistance to exhaust flow, using high-pressure air ； 7) Check whether the oil is cooled by the oil cooler; if not, replace the thermal control valve ； 8) Clean the air filter with low-pressure air ； 9) Replace the oil filter and increase the oil flow control valve ； 10) Inspect and replace the temperature switch. The above answers are for reference only.