| 摘要 |
<p>Disclosed is a connection diagnostic device for a ground fault detector equipped with an oscillation unit which is connected, via a coupling capacitor, to an electrical circuit having a first connection wire and a second connection wire, and with a voltage detection unit which detects the voltage between the oscillation unit and the coupling capacitor. The aforementioned connection diagnostic device is equipped with a first relay and a second relay which are provided in the first connection wire and the second connection wire, respectively. A programmable controller determines the connection state of the ground fault detector on the basis of variations in voltage values detected in the voltage detection unit, with the first relay on or off, and determines the connection state of the ground fault detector on the basis of variations in voltage values detected in the voltage detection unit, with the second relay on or off.</p> |
