CPC H02P 27/047 (2013.01) | 57 Claims |
30. A data processing unit for selecting a frequency converter for a refrigerant compressor unit having a refrigerant compressor and an electric drive motor, the data processing unit comprising:
a display unit presenting an application diagram showing a saturation temperature at an inlet and a saturation temperature at an outlet of the refrigerant compressor and showing all permissible value pairs of the saturation temperature at the inlet and the saturation temperature at the outlet of the refrigerant compressor arranged in an application field enclosed on all sides by an application limit,
selecting on said display unit within said application field of said application diagram of the refrigerant compressor a working state suitable for the operation of the refrigerant compressor unit, using said selected working state to extract experimentally determined drive data for said refrigerant compressor unit stored in a memory for each working state in said application field, and selecting an operating frequency for this selected working state, and, on the basis of the experimentally determined drive data associated with the selected working state and the selected operating frequency, a working state operating current value corresponding to the selected working state and the selected operating frequency is ascertained by the data processing unit for the operation of the refrigerant compressor unit.
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