For the inverter of screw air compressors, will a non-rotating inverter fan affect the inverter? The answer is yes—it will severely affect the normal operation of the inverter, and even cause the shutdown of the entire
Screw Air Compressor system.
The core components of the screw air compressor inverter are IGBT power semiconductor switching elements. When the screw air compressor is in operation, these IGBT components generate a large amount of heat due to high-frequency switching and current passing. The inverter fan serves as the key forced cooling component of the screw air compressor’s electrical control system; without its effective cooling, the temperature sensor will immediately detect the overheating of the IGBT and transmit the signal to the CPU. The CPU will then immediately issue a stop command to protect the inverter and the screw air compressor from damage. At this time, the display panel of the screw air compressor will show an overheating fault code (usually err01, indicating inverter unit protection), which covers fault scenarios such as duct blockage, fan damage, non-operation, or abnormal operation of the screw air compressor inverter. The operator must check and troubleshoot the fault before restarting the screw air compressor to avoid secondary failures.
As the "brain" of the screw air compressor’s frequency conversion control system, the inverter’s working state directly determines the energy-saving effect, operation stability, and service life of the screw air compressor. The following is a detailed introduction to the working environment requirements and key use points of the screw air compressor inverter, which is of great significance for ensuring the efficient and reliable operation of the screw air compressor.
Working Environment Requirements for Screw Air Compressor Inverters
The inverter of the screw air compressor can only work safely and reliably under specified environmental conditions. If the on-site environment of the screw air compressor does not meet the requirements, corresponding improvement measures must be taken to avoid affecting the operation of the inverter and the entire air compression system. The specified working environment conditions for the screw air compressor inverter are as follows:
1. Ambient Temperature
The standard ambient temperature range for most low-voltage inverters of screw air compressors is -10~+50℃, while for 6~10kV medium-voltage inverters used in large screw air compressors, the range is generally 0~40℃. Exceeding this temperature range will easily lead to damage to the electronic components of the inverter, malfunction of control functions, and even cause the screw air compressor to shut down unexpectedly.
It should be noted that the load type of the screw air compressor also affects the temperature tolerance of the inverter. For screw air compressors with constant torque loads (such as some low-pressure large-displacement models), the maximum ambient temperature should not exceed 50℃; for screw air compressors with variable torque loads (the most common type in general industrial scenarios), the maximum ambient temperature should not exceed 40℃. For safety and stability considerations, in practical application and installation of screw air compressors, it is generally emphasized that the ambient temperature of the inverter installation site should not exceed 40℃, as this is the optimal temperature range for the long-term operation of the inverter.
2. The Impact of Ambient Temperature on Output Performance
The ambient temperature of the screw air compressor installation site has a significant impact on the rated output current of the inverter, which in turn affects the air supply capacity of the screw air compressor. Specific performance is as follows:
- When the ambient temperature does not exceed 40℃, the inverter of the screw air compressor can continuously output 100% of its rated current, ensuring that the screw air compressor operates at full load and meets the air demand of the production site.
- When the ambient temperature rises to 45℃, the inverter can only continuously output 80% of the rated current. At this time, the screw air compressor will be in a "derated operation" state, and its air displacement will decrease accordingly, which may not meet the peak air demand of the site.
- When the ambient temperature continues to rise to 50℃, the output current of the inverter is only 60% of the rated value. At this point, the screw air compressor’s air supply capacity will be greatly reduced, and the inverter may trigger overheating protection and shut down at any time.
It is obvious that even a 5℃ increase in ambient temperature can lead to a 20% decrease in the rated output current of the screw air compressor inverter. This fully reflects the importance of temperature control for the inverter. Therefore, special attention must be paid to the ventilation and heat dissipation conditions at the installation site of the screw air compressor, especially the heat dissipation environment around the inverter.
3. Ventilation and Heat Dissipation Requirements
In addition to the inverter’s own fan, the entire screw air compressor station should also be equipped with a reasonable ventilation and heat dissipation system. For example, in a closed air compressor room, exhaust fans or air conditioners should be installed to ensure that the hot air emitted by the screw air compressor’s motor, inverter, and compression host can be discharged in a timely manner. At the same time, the inverter of the screw air compressor should be installed with a certain distance from heat sources (such as the air compressor’s oil-gas separator, exhaust pipe, etc.), and avoid direct sunlight, to prevent the ambient temperature from exceeding the allowable range.
Key Use Points for Screw Air Compressor Inverters
In addition to meeting environmental requirements, the following key points should also be noted in the daily use and maintenance of screw air compressor inverters to ensure the stable operation of the screw air compressor:
- Regular Fan Inspection: Check the operation of the inverter fan during the daily maintenance of the screw air compressor. If abnormal sounds, slow rotation, or non-rotation are found, the fan should be cleaned, repaired, or replaced in a timely manner to avoid overheating faults.
- Cleanliness Maintenance: The inverter of the screw air compressor is easily affected by dust and oil mist in the air compressor room. Regularly clean the surface of the inverter, the air inlet grille, and the internal heat sink to prevent dust accumulation from blocking the heat dissipation channel and reducing the cooling effect.
- Parameter Setting Check: Do not arbitrarily modify the inverter parameters of the screw air compressor. The parameters (such as rated current, overheating protection threshold, frequency range) have been debugged and matched with the screw air compressor model before leaving the factory. Random modification may cause the inverter to fail to work normally, or even damage the IGBT components.
- Fault Handling Timeliness: When the screw air compressor inverter reports a fault, it should be shut down immediately for inspection. Do not force start the machine. After eliminating the fault (such as replacing the fan, cleaning the duct, reducing the ambient temperature), reset the fault and restart the screw air compressor to ensure safe operation.
In summary, the inverter fan is a crucial part of the screw air compressor’s cooling system, and its normal operation is the prerequisite for the stable work of the inverter. At the same time, strictly abiding by the working environment requirements and use points of the screw air compressor inverter can not only ensure the efficient and energy-saving operation of the screw air compressor but also extend the service life of the inverter and the entire air compression system, reducing the maintenance cost of the enterprise.
