The first problem to be paid attention to in the design of the inverter control cabinet is the heat dissipation problem: the heat generation of the inverter is caused by the internal loss. The main circuit is mainly used in the loss of each part of the inverter, accounting for 98%, and the control circuit accounts for 2%. In order to ensure the normal and reliable operation of the inverter, we must heat the inverter. We usually use the fan to dissipate heat. The built-in fan of the inverter can remove the internal heat dissipation of the inverter. If the fan does not work properly, stop the inverter immediately. The high-power inverter needs to add a fan to the control cabinet. The air duct of the control cabinet should be designed reasonably. All the air inlets should be equipped with a dust-proof net, and the air is ventilated smoothly, avoiding the formation of eddy currents in the cabinet and forming dust accumulation at a fixed position; Select the matching fan according to the ventilation of the inverter manual. Pay attention to the anti-vibration problem when installing the fan.
The second problem to be paid attention to in the design of the inverter control cabinet is the electromagnetic interference problem. Due to rectification and frequency conversion, the inverter generates a lot of interference electromagnetic waves around it. These high-frequency electromagnetic waves have certain interference to nearby instruments and instruments, and will generate high-order harmonics. The loop enters the entire power supply network, affecting other meters.When there are high-frequency impact loads in the system, such as electric welders and electroplating power supplies, the inverter itself will be protected due to interference, then consider the power quality of the entire system.