The selection of load type and frequency converter: Frequency converters cannot be used normally in any situation, so it is necessary for users to have a better understanding of the load, environmental requirements, and frequency converter. The load driven by the motor is different, and the requirements for the frequency converter are also different.
　　
A: Fans and water pumps are the most common loads: the requirements for frequency converters are simple, as long as the capacity of the frequency converter is equal to the capacity of the electric motor (air compressors, deep water pumps, sediment pumps, and rapidly changing music fountains require increased capacity).
　　
B: Crane type load: The characteristic of this type of load is that it has a large impact when starting, so the frequency converter is required to have a certain margin. At the same time, when placing elbows under heavy objects, there will be energy feedback, so a braking unit or a shared busbar method should be used.
　　
C: Uneven load: Some loads are sometimes light and sometimes heavy, and the capacity of the frequency converter should be selected according to the heavy load situation, such as steel rolling mill machinery, crushing machinery, mixers, etc.
　　
D: Large inertia loads: such as centrifuges, punch presses, and rotary kilns in cement plants, which have a large inertia, may oscillate during startup, and there is energy feedback when the motor decelerates. A slightly larger capacity frequency converter should be used to accelerate startup and avoid oscillation. Cooperate with the braking unit to eliminate feedback electrical energy.
　　
Long term low-speed operation, due to the high heat generation of the motor and the reduced cooling capacity of the fan, it is necessary to increase the reduction ratio or switch to a 6-stage motor to operate the motor at a higher frequency.

The installation location of the frequency converter must meet the requirements of the standard environment, otherwise it may cause malfunctions or shorten the service life; The distance between the frequency converter and the drive motor is generally not more than 50 meters. If a longer distance is required, the carrier frequency needs to be reduced or the output reactor option needs to be added to operate normally.