| 摘要 |
PURPOSE:To delicately control a frequency to gradually raise or lower by providing frequency command means for calculating an output frequency command value to be output next at a predetermined period of time to update it to output it, and switching means for controlling a main switching element of frequency converting means. CONSTITUTION:Frequency command means 20 has memory means 20c, frequency increment value calculating means 20b and frequency calculating means 20a. The means 20 reads, when inputting a command for altering a step, a target frequency f1 and an acceleration/deceleration time Ta from the means 20c for storing the operating state of an inverter, and sends them to the means 20b. The means 20b calculates a frequency increment value, and sends it to the means 20a. |
