| 摘要 |
A power conversion device including, a power converter controlling a motor in variable speed control, first to second control circuits outputting first to second control signals, first to second detectors detecting a state of the power converter and outputting first to second detection signals to the first to second control circuits, a switch receiving the first to second control signals and outputting one of the control signals to the power converter, and a selection circuit outputting a changeover selection signal to the switch for outputting the second control signal instead of the first control signal, when the switch has outputted the first control signal and the first control circuit fails.
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