The Summer Heat is Coming: How to Use the Screw Compressor Inverter?

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1. High Ambient Temperature Around the Inverter

Cause: The inverter is composed of numerous electronic components, and during operation, it generates a large amount of heat. Especially when the IGBT operates in a high-frequency state, it produces even more heat. If the ambient temperature is too high, it can lead to the internal components of the inverter overheating. To protect the internal circuits, the inverter will report a high temperature fault and stop.

Countermeasure: Lower the temperature of the area where the inverter is located, such as installing air conditioning or fans for forced cooling.

2. Poor Ventilation of the Inverter

Cause: If the inverter’s airflow path is blocked or the control cabinet’s ventilation is obstructed, it will affect the inverter’s internal heat dissipation, leading to an overheat alarm.

Countermeasure: Regularly inspect and maintain the inverter, remove any debris blocking the airflow, and ensure smooth ventilation.

3. Fan Sticking or Damage

Cause: When the inverter's fan is damaged, a large amount of heat accumulates inside the inverter and cannot dissipate.

This highlights the importance of regular maintenance and care of the inverter. So, how can we reduce the failure rate and ensure the inverter safely survives the summer, minimizing customer losses? Here are a few key points:

Summer Inverter Maintenance and Care: Key Considerations

1. Suitable Temperature, Humidity, Ventilation, Dust-Free, and Interference-Free Environment: Clean both the internal and external parts of the inverter.
   

Main Factors Affecting Inverter Heat Dissipation:

1. Fan Operation Protection: The internal fan of the inverter is the primary method of heat dissipation within the enclosure, ensuring the normal operation of the control circuits. Therefore, if the fan is not working properly, it should be maintained immediately.
   
2. Overheat Protection of Inverter Module Heat Sink: The inverter module is the main part of the inverter that generates heat and is the most important yet fragile component in the inverter. Therefore, all inverters are equipped with overheat protection devices on the heat sink.
   
3. Ventilation Path Inlet and Outlet Should Not Be Blocked: The ambient temperature may also exceed the inverter’s allowed temperature range. Some solutions and improvement suggestions are proposed, which can be useful for the practical application of inverters in engineering.
   
4. Interference Issues: Pay attention to interference from the inverter to the microcomputer control board. If the user-designed microcomputer control board has poor craftsmanship and does not meet EMC international standards, the conducted and radiated interference generated after using the inverter can lead to abnormal operation of the control system. Necessary measures should be taken.
   

Summer Maintenance and Care for Inverters:

1. Check the operating status of the inverter, ensuring the voltage and current values during operation are within the normal range.
   
2. Carefully monitor and record the ambient temperature of the inverter room. The ambient temperature should generally be between -10°C and 40°C, and the temperature rise of the phase-shifting transformer should not exceed 130°C.
   
3. Avoid direct sunlight, damp, or waterlogged areas. Summer is a rainy season, so prevent rainwater from entering the inverter (e.g., rainwater entering through the ventilation outlet).
   
4. Inverter Installation:
   
5. Depending on the site environment, regularly clean the fans and ventilation paths to prevent blockages, especially in industries like textiles, where cotton fluff is common. Cleaning should be done carefully without electricity to ensure safety.
   
6. Regularly check the ventilation and heat dissipation equipment of the inverter to ensure normal operation, especially the inverter’s built-in fan. How can you determine if the fan has issues?