In order to use the inverter correctly, it is necessary to consider that the service life of the VFD decreases exponentially with the increase in temperature. This is due to: When the ambient temperature rises by 10 degrees, the service life of the VFD is halved. So pay attention to heat dissipation! When the VFD is working, the current flowing through the VFD is very large, and the heat generated by the VFD is also very large, and the effect of its heating cannot be ignored.
Usually the VFD unit is in the control cabinet. To understand the calorific value of a VFD, it can be estimated by the following formula: Calorific value approximate = VFD capacity (KW) ×55 [W]
Here, if the capacity of the VFD is based on the constant torque load (the overcurrent capacity is 150% * 60s), if the VFD is equipped with a DC reactor or AC reactor, and it is also in the cabinet, then the heat generation will be higher. It is best to install the reactor on the VFD side or above the measurement. In this case, it can be estimated as: VFD capacity (KW) ×60 [W].
Note: If there is a braking resistor, it is best to install it in a separate location from the VFD, such as on or next to the cabinet, because the braking resistor dissipates a lot of heat. So, how can you reduce the heat generation in the control cabinet? When the VFD unit is in the control cabinet, the calorific value of the VFD should be taken into account. According to the addition of heat in the cabinet, the size of the cabinet should be appropriately added. Therefore, in order to minimize the size of the control cabinet, the amount of heat generated in the cabinet must be minimized.
If the heat sink of the VFD is placed outside the control cabinet while the VFD is being installed, 70% of the heat generated by the VFD is released to the outside of the control cabinet. Large-volume VFDs are more effective for large-volume VFDs due to their high calorific output. It is also possible to separate the body from the radiator with a separator, so that the heat dissipation of the radiator will not affect the normal operation of the VFD. The heat dissipation design of VFD is mainly based on vertical devices, and the heat dissipation will be worse when placed horizontally! Regarding cooling fans, VFDs with slightly higher power are equipped with cooling fans. At the same time, it is also advisable to install cooling fans at the air outlets of the control cabinet. The air inlet should be filtered to prevent dust from entering the control cabinet. Note that fans on control cabinets and VFDs are a must and cannot be replaced.
In addition, the following two issues should be paid attention to when dissipating heat:
(1) At an altitude higher than 1000m, due to the decrease in air density, the cooling air volume of the cabinet should be added to improve the cooling effect. Theoretically, VFD should also consider volume reduction, 1000m every -5%. However, in fact, the load capacity and heat dissipation capacity of VFD are generally larger than the actual use, so it depends on the specific use. For example, at 1500 meters, but periodic loads, such as elevators, do not need to be derated.
(2) The heat of the switching frequency: VFD mainly comes from the IGBT, and the heat of the IGBT will be collected at the moment of on/off. Therefore, when the switching frequency is high, the heat generation of natural VFD increases. Some manufacturers claim that lowering the switching frequency can increase the capacity, and this is the reason.
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