| 摘要 |
One of a plurality of voltages is adapted to be applied to power supply terminals ( 2 a, 2 b, 2 c). A rectifying circuit ( 6 ) rectifies the applied voltage and develops a rectified voltage between the output terminals ( 6 a, 6 b) thereof. Inverters ( 16 a, 16 b) are connected into one of a plurality of inverter connections between the rectifier output terminals ( 6 a, 6 b) in response to one of a plurality of inverter connection indicative signals. The inverter connections are set to correspond to respective ones of the plurality of voltages, so that a predetermined voltage can be applied to each inverter whichever one of the plurality of voltages is applied to the power supply terminals. An inverter connection indicative signal generating circuit ( 34 ) is manually operated to generate a desired one of the inverter connection indicative signals. A thyristor ( 8 ) is disposed between the rectifier output terminals ( 6 a, 6 b) and the inverters ( 16 a, 16 b). When one of the plurality of voltages is applied to the power supply terminals, a voltage detecting circuit ( 38 ) generates an inverter connection indicative signal corresponding to the voltage applied to the power supply terminals. A judging unit ( 26 d) determines whether or not the inverter connection indicative signals from the voltage detecting circuit ( 38 ) and the inverter connection indicative signal generating circuit ( 34 ) match. When the two signals match, a thyristor control unit ( 26 a) provides a CLOSE signal to the thyristor ( 8 ). When the two signals do not match, an alarm circuit ( 42 ) is activated.
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