System efficiency is equal to the product of inverter efficiency and motor efficiency, only when both are working at a higher efficiency, the system efficiency is higher. From the perspective of efficiency, in the selection of inverter power, pay attention to the following points:

(1) frequency converter power value and motor power value is equivalent when the most appropriate, in order to facilitate the frequency converter in the high efficiency value of the operation.

(2) When the power grading of the inverter is not the same as that of the motor, the power of the inverter should be as close as possible to the power of the motor, but it should be slightly larger than the power of the motor.

(3) When the motor belongs to frequent starting, braking work or in heavy load starting and more frequent work, can choose a large level of frequency converter, in order to utilize the frequency converter long-term, safe operation.

(4) After testing, the actual power of the motor is really rich, you can consider the selection of power less than the motor power of the frequency converter, but pay attention to whether the instantaneous peak current will cause overcurrent protection action.

(5) When the frequency converter and motor power is not the same, then you must adjust the settings of the energy-saving program accordingly, in order to achieve a higher energy-saving effect!