What is the reason for the compressor to stop empty?

Compressor empty shutdown (I. e. automatic shutdown under no load) may be caused by electrical system failure, control system abnormality, mechanical component problems, environmental factors or improper operation settings. The following are specific reasons and analysis:

1. electrical system fault

1. power issues
   • voltage instability: Grid voltage fluctuations or insufficient power supply may cause protective shutdown of the compressor motor. For example, when the voltage is less than 20% of the rated value, the motor may stop due to overload.
   • phase-deficient operation: The loss of any phase in the three-phase power supply will cause the motor torque to drop, the current will increase, and the protection device will be triggered to stop.
   • Loose wiring: Loose control wiring or motor wiring may cause poor contact, resulting in intermittent shutdown.
2. Motor fault
   • overheat protection: The motor winding temperature is too high (such as due to poor heat dissipation, excessive load) will trigger the thermal relay action, forced shutdown.
   • Insulation damage: Aging or breakage of motor insulation may cause leakage, causing the leakage protector to trip.
   • Bearing damage: Motor bearing wear or jam will increase the running resistance, resulting in motor overload shutdown.

Abnormal 2. control system

1. pressure switch fault
   • setpoint drift: The set pressure value of the pressure switch is offset due to aging or vibration, causing the compressor to stop when the set pressure is not reached.
   • Contact adhesion: The contact of the pressure switch is stuck or poorly connected, and the shutdown signal may be sent by mistake.
2. PLC/Controller Program Error
   • logic Error: Logic errors in the PLC program (such as misjudgment of conditions) may cause the compressor to stop in an unexpected state.
   • Communication failure: The communication between the controller and the sensor or actuator is interrupted (such as the broken signal line and interference), which may cause misoperation.
3. Sensor failure
   • pressure sensor fault: The pressure sensor is damaged or the signal is distorted, which may send the wrong pressure value to the controller, causing downtime.
   • Temperature sensor fault: Abnormality of the temperature sensor may cause the compressor to stop due to "misjudgment of high temperature.

3. mechanical component problems

1. gas valve failure
   • intake/exhaust valve stuck: The compressor cannot normally suck and exhaust due to carbon deposition, abrasion or foreign matter sticking of the air valve, triggering the protection shutdown.
   • The air valve is not tightly sealed.: Leakage of the air valve will cause a decrease in compression efficiency, which may cause low-pressure or high-temperature protection shutdown.
2. Wear of piston ring/cylinder liner
   • wear of piston ring: Wear of the piston ring will cause leakage in the compression chamber and decrease the compression ratio, which may cause low-pressure protection shutdown.
   • Scratch of cylinder liner: Cylinder liner scratches will aggravate leakage and may produce abnormal noise and vibration.
3. Belt/coupling problem
   • belt is loose or broken: In the belt-driven compressor, the loose or broken belt will cause the motor to run idle, and the compressor cannot work and stop.
   • Coupling damage: Coupling wear or fracture will cut off the power transmission and cause shutdown.

Impact of 4. environmental factors

1. cooling system fault
   • cooling Fan Stopped: Failure of the cooling fan of the air-cooled compressor will cause poor heat dissipation and cause high-temperature protection shutdown.
   • Insufficient cooling water flow: Insufficient cooling water flow or high water temperature of the water-cooled compressor will also cause high temperature shutdown.
2. The ambient temperature is too high
   • intake air temperature too high: Excessive ambient temperature or clogging of the intake air filter will cause the intake air temperature to rise and the compression ratio to drop, which may cause low pressure or high temperature protection shutdown.
   • Poor ventilation in machine room: Poor ventilation in the computer room will aggravate the difficulty of heat dissipation of the equipment and cause shutdown.

5. operation set improperly

1. automatic shutdown settings
   • timed shutdown: The compressor may be set to stop automatically at regular intervals (e. g. when unattended at night).
   • Pressure band set too narrow: The return difference (pressure band) of the pressure switch is set too small, which may cause the compressor to start and stop frequently or stop by mistake.
2. Manual misoperation
   • emergency stop button is triggered: The operator mistakenly touches the emergency stop button, causing the compressor to stop.
   • Remote Control Signal Interference: Interference or misfiring of the remote control signal may cause the compressor to stop.

6. troubleshooting and solution suggestions

1. preliminary inspection
   • check whether the power supply voltage, phase and wiring are normal.
   • Observe the compressor control panel for fault codes or alarms.
   • Check the cooling system for proper operation (e. g. fans, cooling water flow).
2. In-depth investigation
   • use a multimeter to test the motor insulation resistance and three-phase current balance.
   • Check the calibration and wiring of key sensors such as pressure switches and temperature sensors.
   • Disassemble and check the wear of mechanical parts such as air valve and piston ring.
3. Professional maintenance
   • if it involves electrical system or complex mechanical failure, it is recommended to contact professional maintenance personnel.
   • Regular preventive maintenance of the compressor (such as replacing lubricating oil, cleaning the cooler, checking the air valve seal) can reduce sudden failure.