| 摘要 |
PURPOSE:To reduce the capacity of a control inverter by starting an added motor by the inverter from a low frequency, and synchronizing with the inverter after accelerating. CONSTITUTION:When a motor 3a is operated during the operation of a motor 3b by a control inverter 1, contactors 8 and 5b are closed to start from low frequency and to accelerate the motor 3b by a starting inverter 4. Then, the output frequency, voltage and phase of the inverter 1 are detected to synchronize the output of the inverter 4 with the inverter 1 to open the contactor 5b, and to close the contactor 2b. Thus, the capacity of the control inverter can be reduced. |
