| 摘要 |
In a servo control apparatus constituted by a converter unit 3 for rectifying an AC power supply voltage to produce a DC power supply voltage, and a plurality of inverter units 5 for producing drive power supply voltages of motors from the DC power supply voltage, the servo control apparatus is provided with a power supply breaker 2 which is connected to the side of the AC power supply of the converter unit 3 ; and a ground fault detecting circuit 16 built in the converter unit 3 . When a ground fault happens to occur, the servo control apparatus stops the operations of all of the inverter units 5 so as to cut off the breaker 2.
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