| 摘要 |
PURPOSE:To enable the detection of poor insulation for a higher safety of work without removal of an inductance load by detecting poor insulation based on output current when output of a high frequency power source is supplied between cables. CONSTITUTION:A power source control panel 1, a cable 3 and a drum 4 are provided on the body of a crane and a cable 5, a connector 6 and a lifting magnet 7 are suspended from the crane. One end 9a of a high frequency power source 9 is connected to an output terminal 2a of the control panel 1 through an ammeter 10 and an interlocking contact 11a of a magnet switch for on-off operation of a power source while the other end 9b thereof to an output terminal 2b through a contact 11b. When a poor insulation occurs in the cables 3 and 5, current flowing through the ammeter 10 thereby enabling the detection of the poor insulation. |
