The following points should be determined when selecting the inverter:
Inverter selection method 1: use the purpose of frequency conversion; constant voltage control or constant current control.
Inverter selection method 2: The load type of the inverter; such as the vane pump or the volumetric pump, pay special attention to the performance curve of the load, and the performance curve determines the method and method of application.
Inverter selection method 3: matching problem between inverter and load;
I. Voltage matching; the rated voltage of the inverter matches the rated voltage of the load.
II. Current matching; common centrifugal pump, the rated current of the inverter matches the rated current of the motor. For special loads such as deep pumps, it is necessary to refer to the motor performance parameters to determine the inverter current and overload capability with the maximum current.
III. Torque matching; this can happen with a constant torque load or with a reduction gear.
Inverter selection method 4: When using a frequency converter to drive a high speed motor, the output current value increases due to the small reactance of the high speed motor and the increase of higher harmonics. Therefore, the selection of the inverter for high-speed motors is slightly larger than that of ordinary motors.
Inverter selection method 5: If the inverter needs to run long cable, it is necessary to take measures to suppress the influence of long cable to ground coupling capacitor, so as to avoid insufficient output of the inverter, so in this case, the inverter capacity should be enlarged by one gear. Or install an output reactor at the output of the inverter.
Inverter selection method 6: For some special applications, such as high temperature, high altitude, this will cause the inverter to derate, the inverter capacity should be amplified by one gear.