When selecting Siemens frequency converters, the following points should be determined:
1) The purpose of frequency conversion; constant pressure control or constant current control, etc.;
2) The load type of the Siemens inverter; Such as vane pumps or positive displacement pumps, pay special attention to the performance curve of the load, the performance curve determines the way and method of application;
3) Siemens inverter and load matching problem;
I. Voltage matching; The rated voltage of the Siemens inverter corresponds to the rated voltage of the load.
II. Current Matching; For ordinary centrifugal pumps, the rated current of Siemens inverter is consistent with the rated current of the motor. For special loads, such as deep-water pumps, it is necessary to refer to the motor performance parameters to determine the current and overload capacity of the Siemens frequency converter at the maximum current.
III. Torque matching; This can happen when there is a constant torque load or a reducer device.
4) When using Siemens inverter to drive a high-speed motor, the output current value increases due to the low reactance of the high-speed motor, and the addition of higher harmonics. Therefore, the selection of Siemens inverters for high-speed motors has a slightly larger capacity than that of ordinary motors.
5) If the Siemens inverter is to run with a long cable, measures should be taken to suppress the influence of the long cable on the ground coupling capacitance to avoid insufficient output of the Siemens inverter, so in this case, the capacity of the Siemens inverter should be expanded by one gear, or the output reactor may be installed at the output end of the Siemens inverter.
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