| 摘要 |
PURPOSE:To improve service rate by individually sensing service interruption of a DC600V circuit and an AC100V circuit of each load-dispatching section, and supplying the interrupted DC600V or AC100V from another load-dispatching section according to its sense signal. CONSTITUTION:The auxiliary power supply circuit comprises a DC600V service interruption detector 7 at an output side of a converter 2. After a load half reduction command is output to a DC600V circuit of a load-dispatching section in which a malfunction occurs according to its detection signal, a contactor 4 for the DC600V circuit is operated. After a load half reduction command only to an AC100V circuit in which a malfunction occurs is output according to the detection signal of an AC100V power interruption detector 6. The contactor for the DC600V is not operated, but only a contactor 5 for the AC100V circuit is operated. Therefore, the half reduction command is not output to a load of the DC600V circuit in the case of a trouble only in an inverter, it does not affect any influence to the DC600V circuit, and hence a power supply for a service device is obtained thereby to continue service. |
