| 摘要 |
PROBLEM TO BE SOLVED: To detect the fault from the beginning of the operation of a plurality of uninterruptible power sources from which output voltage is outputted when the input voltage obtained by diode OR connection of output voltage is applied. SOLUTION: An uninterruptible power unit has anode voltage sense lines 3A-3N on the anode side of a diode, cathode voltage sense lines 4A-4N at the cathode side, and short voltage detecting circuits 5A-5N composed of each anode voltage sense lines and the cathode voltage sense lines, and even in the case that its own uninterruptible power source has not started, this enables the report to the power controller 7 of the short voltage alarm signals 6A-6N by operating the short voltage detecting circuits 5A-5N of its own uninterruptible power source by the voltage of other uninterruptible power source. Hereby, the existence of the uninterruptible power source impossibility of start by abnormality can be reported to a power monitor, and the time for trouble shooting and the recovery from it can be shortened. |
