What are the causes and solutions for an air compressor suddenly tripping and shutting down while in operation? Today, let's briefly discuss this topic.
Fault Phenomenon: One or more air compressors trip and shut down during normal operation, or trip and shut down shortly after startup.
Cause Analysis:
1. Abnormal motor voltage or power supply voltage.
2. The unit's discharge pressure exceeds the rated pressure, leading to motor overload and triggering the motor's thermal protection.
3. Poor quality of lubricating oil or inadequate lubrication, resulting in motor overload and triggering the motor's thermal protection.
4. The oil-fine separator is clogged, or the lubricating oil pressure is excessively high, triggering the safety protection mechanism due to a large pressure differential across the separator.
5. Faults within the air compressor's main body (air end), such as carbon buildup or the ingress of foreign objects into the rotors.
6. Poor or loose electrical wiring connections, or a faulty contactor.
7. High discharge temperature fault.
8. Faulty oil shut-off solenoid valve.
9. Unreasonable pressure settings.
Solutions:
1. Check the motor power and voltage to determine if they are abnormal.
2. Check the pressure gauge; if the pressure exceeds the set limit, the pressure switch needs to be adjusted.
3. Verify the oil grade and replace the lubricating oil.
4. Replace the oil-fine separator.
5. Attempt to turn the air end manually (using a handwheel); if it cannot be turned, professional maintenance personnel are required to inspect and repair the main unit.
6. Inspect and repair the electrical wiring, or replace the contactor.
7. Check the cooling water supply and clean the cooler.
8. Clean or replace the oil shut-off solenoid valve.
9. Check whether the upper limit setting of the pressure switch is set too low, or if the pressure switch's upper limit is set lower than the air compressor's designated shutdown pressure.