| 摘要 |
PURPOSE:To continue the operation by switching and connecting to a commercial power source when a protecting unit is operated, returning to an inverter operation after the prescribed time, and operating by the commercial power source when the returning number becomes the prescribed value. CONSTITUTION:Relays P1, D2 are energized and controlled at an inverter operating time. Thus, contacts P11, D21 are closed, and a motor 6 is operated by an inverter 4. When the inverter protecting device is operated, a timer mechanism 8 is operated. Thus, the motor 6 is driven by a commercial power source 1 for the prescribed time. After the prescribed time is elapsed, the motor 6 is again driven through the inverter 4. At this time, a signal is applied to a counter mechanism 9. When the value of the mechanism 9 becomes the prescribed value, a relay R2 is energized. Thus, the relays P1, D2 are deenergized, the D1 is energized, and the motor 4 is driven by the commercial power source 1. |
