Why Should We Select A Higher Gear When Selecting A Frequency Converter？

Why should we select a higher gear when selecting a frequency converter?

The frequency converter is selected based on the rated current of the equipment motor, not the power. And the altitude factor must also be considered;

Altitude factors:

As the altitude increases, the air pressure gradually decreases and the air becomes thinner. The frequency converter generates heat during operation and relies on air convection to dissipate heat. In high-altitude areas, the thin air leads to a decrease in heat dissipation capacity, and the frequency converter is prone to overheating. If the frequency converter runs at high temperatures for a long time, the performance of electronic components will decrease, the life will be shortened, and it may even cause failures, affecting the normal operation of the equipment. Selecting a higher gear for the frequency converter means that the capacity of the frequency converter is increased, and its internal heat dissipation structure and power components are relatively more powerful. It can better handle the heat generated by itself in a high-altitude environment with poor heat dissipation conditions, so that the frequency converter can operate stably within the allowable temperature range, thereby ensuring the reliability and stability of the system and extending the service life of the frequency converter.

Equipment motor factors:

When the motor starts, it will generate a large starting current, generally 4-7 times the rated current. If the inverter type is the same as the rated power of the motor, it may not be able to withstand the high current when the motor starts, causing the inverter to overcurrent protection or even damage. A large-range inverter can provide a larger current capacity to ensure smooth motor startup. Providing a larger overload capacity can avoid frequent tripping of the inverter due to overload, ensuring the stability and reliability of the system.

The inverter will have a certain power loss during operation, especially when operating at high frequency and high load. Choosing a large-range inverter can make it operate at a lower load rate, reduce its own loss and heat, and improve efficiency and service life.