(1) When selecting the inverter, the actual current value of the motor should be used as the basis for selecting the inverter, and the rated power of the motor can only be used as a reference. In addition, because the output of the inverter contains high harmonics, the power factor and efficiency of the motor will also be reduced. Therefore, the current of the motor increases by 10% and the temperature rise increases by about 20% compared to the power supply from the grid. Therefore, when selecting the motor and the inverter, this situation should be taken into consideration, and an appropriate width should be reserved to prevent the temperature from rising and affecting the service life of the motor.
(2) If the inverter is to run long cables, measures should be taken to suppress the influence of the cables on the grounding capacitance and avoid insufficient output of the inverter. Therefore, the inverter should expand or select an output voltage transformer at the output port of the inverter.
(3) When the inverter controls multiple motors in parallel, the total length of the inverter from the inverter to the motor within the allowable range must be considered. If it exceeds the specified value, you need to enlarge one or two gears to select the inverter. The other case is the inverter control mode of V/F control. The inverter cannot protect the motor from over current protection and overload protection. Add a fuse in each motor to achieve protection.