I. Overview More and more customers are encountering overheating alarms during inverter operation. These problems are generally related to the inverter's heat dissipation and control cabinet ventilation. Inverter heat dissipation is essentially the power consumption of a single unit during operation; relevant data can usually be found in the product design manual. Properly designing the control cabinet's ventilation volume based on the inverter's operating power consumption is the main way to avoid overheating alarms. To help customers use inverters better and ensure more stable operation, the following is a simple introduction on how to calculate the inverter's ventilation volume. II. Calculation Method for Inverter Ventilation Volume Calculate the required ventilation volume for the inverter using the following formula: = (PΦ) / (Δt) = (P/Δt) * ... According to regulations, the maximum allowable cooling air outlet temperature cannot exceed t_OUT.MAX (45℃). Therefore, the maximum allowable value of Δt = 45℃ - inlet temperature (t_IN). III. Example : Taking the Danfoss VLT5000 series inverter as an example, the calculation is performed under the extreme condition of Δt = 5℃. The following are the calculation results, where the rated power consumption data can be found in the Danfoss VLT5000 series inverter operation manual. VLT5000 (AC380V) ventilation volume IV. Special considerations during design : 1. According to the VDE160 standard, the cooling air inlet temperature (t_IN) must be lower than t_IN.MAX (40℃), and the 24-hour average temperature must be lower than 35℃; 2. The outlet of the ventilation system must be higher than the highest inverter; 3. The design must consider the pressure loss generated after the air passes through the filter, and the pressure drop when the filter is blocked, etc., and a margin should be left when designing the ventilation volume.