| 摘要 |
<p>In an uninterruptible power supply system, control units (11) of three uninterruptible power supply apparatuses (U1 to U3) are connected to each another by communication cables (C1, C2) to form one total control unit (13). The total control unit (13) brings three switches (S1) into conduction when a bias power feeding mode is selected by any one operation unit (10) and brings three switches (S2) into conduction when an inverter power feeding mode is selected. As such, there is no need to separately provide an operation unit and a control unit for operating and controlling all the uninterruptible power supply apparatuses (U1 to U3).</p> |
