The selection of frequency converter is mainly determined by the load characteristics of the drive and the actual working current of the motor. In addition, there are the following considerations:

1. For some applications with high temperature (more than 50 degrees) and high altitude (more than 1000 meters), there should be a certain margin in the selection of frequency converter to ensure the service life of frequency converter and motor.

2, distance

The distance between the location of the inverter installation and the drive motor is more than 50 meters, and the inverter selection should be combined with the reactor to reduce the carrier frequency.

3. More than one

When a frequency converter drives multiple motors, if the cable connected in the middle is too long, the general frequency converter shall be amplified for use in the selection, and a fuse shall be installed at the back of each motor.

4. High-speed motor

A large number of harmonics will be generated during the operation of the high speed motor, which will enhance the output current of the inverter and generate a large amount of heat. Therefore, the selection of frequency converter is also larger than the ordinary motor.

5. Explosion-proof motor

In some mine and oil mining environments, when the frequency conversion system is the explosion-proof motor, the frequency converter should be selected with explosion-proof function and placed in a safer place.

6. Protection level

For dusty and humid applications, the frequency converter should pay attention to its protection level. Or choose ambition AMB inverter, the fan can also run in the water.

7. Single-phase motor

When the single-phase motor is used in the field, the inverter is useless.

8. Pole-changing motor

When the pole changing motor is used in the field, the frequency converter shall be selected to ensure that the large working current does not exceed the rated current of the frequency converter, and the frequency converter shall be prevented from being damaged by idling when the motor is converted.

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