| 摘要 |
PURPOSE:To make it possible to perform the optimum V/f control even if the- fluctuation in voltage is generated in a broad range by detecting the input voltage of an inverter, and selecting and switching the optimum V/f value corresponding to the detected signal of the input voltage among a plurality of the V/f data stored in a reference means. CONSTITUTION:An input voltage VIN is detected with a voltage detecting circuit 6 when an aircondioning unit 4 is stopped. For the determination of the input voltage VIN, the average value of the read-out values during a specified time period is used. A detected voltage Vd of the voltage detecting circuit 6 is inputted into a controller 7. Namely, a table, wherein the optimum V/F value corresponding to the detected voltage Vd is stored, is selected. When there is no fluctuation in input voltage under this state, a compressor 3 is driven by using the V/f value at this time. Meanwhile, when there is the fluctuation in input voltage, the input voltage VIN is read again. When the input voltage VIN is changed, the optimum V/f value corresponding to the input voltage VIN after the change is selected again. The operation of the air conditioner is carried out with the V/f value as the reference. |
