If you want to make the inverter last a long time, you must seriously consider the problem of heat dissipation. Because the failure rate of the inverter increases exponentially with the increase of temperature, the service life decreases exponentially with the increase of temperature. A 10 degree increase in ambient temperature halves the service life of the inverter. Therefore, we should pay attention to the problem of heat dissipation! When the inverter is operating, the current flowing through the inverter is very large, and the heat generated by the inverter is also very large, and the influence of its heating cannot be ignored.
Typically, the frequency converter is installed in the control cabinet. To understand the approximate calorific value of an inverter, we can use the following formula to budget: Approximate heat generation = inverter capacity (KW) ×55 [W]. Here, if the capacity of the inverter is based on the constant torque load (overcurrent can only be 150% * 60s), if the inverter has a DC reactor or AC reactor, and it is also in the cabinet, the heat will be greater. It is better for the reactor device to be on the side of the inverter or above the measurement. At this time, you can use the budget: inverter capacity (KW) ×60 [W] Since the hardware of each inverter manufacturer is similar, the above formula can be used for various brands of products. Note: If there is a braking resistor, due to the large amount of heat dissipation of the braking resistor, it is best to isolate the device from the inverter, such as installed on the top or next to the cabinet. So, how can you reduce the heat generated in the control cabinet?
When the inverter is installed in the control cabinet, the calorific value of the inverter should be considered. According to the addition of the heat value in the cabinet, the scale of the cabinet should be appropriately added. Therefore, in order to minimize the size of the control cabinet, it is necessary to reduce the heat value generated in the cabinet as much as possible. If the radiator part of the inverter is placed outside the control cabinet when the inverter is installed, 70% of the heat generated by the inverter will be released to the outside of the control cabinet. Because the large-capacity inverter has a large amount of heat, it is more effective for large-capacity inverters. It can also be separated from the radiator by using an isolation plate, so that the heat dissipation of the radiator does not affect the inverter body. It works very well this way, too. The heat dissipation planning of the inverter is based on the vertical device, and the heat dissipation will be worse if it is placed horizontally! In general, the inverter with slightly higher power of the cooling fan is equipped with a cooling fan. Together, it is also advocated to install cooling fans at the air outlet on the control cabinet. The air inlet should be filtered to prevent dust from entering the control cabinet. Pay attention to the fans on the control cabinet and the inverter, and you can't replace anyone.
In addition, the following two problems should be paid attention to when dealing with heat dissipation:
(1) In the local area above 1000m above sea level, due to the decrease in air density, the cooling air volume of the cabinet should be increased to improve the cooling effect. Theoretically, the frequency converter should also consider the decapacitation, 1000m every -5%. However, due to the fact that the load and heat dissipation capacity of the planned upper inverter are generally larger than the actual use, it also depends on the detailed application. For example, in the local area of 1500m, but periodic loads, such as elevators, do not need to be reduced.
(2) Switching frequency: The heating of the inverter mainly comes from the IGBT, and the heating of the IGBT is concentrated at the moment of opening and closing. Therefore, when the switching frequency is high, the heat generation of the natural inverter becomes larger. Some manufacturers claim that the down-switching frequency can be expanded, which is the reason.
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