| 摘要 |
PURPOSE:To obtain the characteristic of starting excellent in response, also when a load is required to be quickly started, by controlling an inverter with the V/f pattern of a steep slope when an operated member is operated at a quick speed. CONSTITUTION:On an inverter 1 for driving a machine 3 via a three phase induction motor 2, the foot push speed of a foot push pedal 5 is detected by a speed detection circuit 6. By a ROM 7, the characteristic of two kinds of V/f patterns is kept in memory. By a selection circuit 8, the specified V/f pattern is selected from the ROM 7 based on input from the speed detection circuit 6 and is read, and the input to an inverter control circuit 4 is provided. As a result, by reading the V/f pattern of a steep slope when the foot push speed is equal to or more than a set value, the characteristic of starting excellent in response can be obtained, also when a load is required to be quickly started. |
