Inverter control cabinet design - Solutions - Huaqiang Electronic Network
The inverter should be installed inside the control cabinet. When designing the control cabinet, several important factors must be taken into consideration to ensure optimal performance and longevity of the system.
1) Heat Dissipation: The heat generated by the inverter comes from internal losses. Most of the heat (about 98%) is produced by the main circuit components, while the control circuit contributes only about 2%. To maintain reliable operation, proper heat dissipation is essential. Fans are typically used for cooling. Many inverters come with built-in fans that help remove internal heat. If the fan fails, the inverter should be stopped immediately. For high-power inverters, additional fans may need to be installed in the control cabinet. The air duct design should be efficient, with dust filters on all air inlets to prevent dust accumulation. Airflow should be smooth to avoid eddies that could trap dust in certain areas. It's important to select the right fan based on the inverter’s ventilation requirements, and the installation should include vibration damping measures to reduce noise and mechanical stress.
2) Electromagnetic Interference (EMI): Inverters generate electromagnetic waves due to rectification and frequency conversion. These high-frequency signals can interfere with nearby equipment and introduce harmonics into the power supply network, potentially affecting other devices. If the inverter's power exceeds 25% of the total system power, anti-interference measures should be considered for the control power supply. Additionally, if there are high-frequency loads like welding machines or electroplating units in the system, the inverter might trigger protective mechanisms due to interference. This highlights the importance of evaluating the overall power quality in such environments.
3) Protection Measures: Several key protection aspects should be addressed:
I. Waterproofing and Condensation Control: If the inverter is installed on-site, it’s crucial to check for any potential water leaks above the cabinet. No water should splash near the inverter. The control cabinet should have a minimum protection rating of IP43 to prevent moisture ingress and condensation buildup.
II. Dust Protection: All air inlets must be equipped with dust filters to prevent the entry of debris. These filters should be easily removable for cleaning and maintenance. The mesh size of the filter should be chosen based on site conditions, and the connection between the filter and the cabinet should be sealed properly to prevent dust infiltration.
III. Corrosion Resistance: In environments with corrosive gases, such as chemical plants, it's advisable to install the inverter cabinet inside a control room to protect it from harmful fumes. This helps extend the lifespan of the equipment and ensures stable operation under harsh conditions.
Proper installation, maintenance, and environmental considerations are essential to ensure the safe and efficient operation of the inverter system over time.
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