| 摘要 |
PURPOSE:To improve portability and reliability of a controlling cable by making control using two signal lines providing a rectifier cell in an operation switch for making and breaking welding output and a solenoid valve for switching shield gas respectively in series and contrariwise. CONSTITUTION:The first rectifier cell 17 is provided in series in the operation switch for making and breaking welding output, and at the same time, the second rectifier cell 16 reverse in rectifying direction is provided in series to the solenoid valve 12 for switching shield gas. When the switch 11 is made on in this circuit, a relay 15 operates. However, as the rectifier cell 16 of the solenoid valve 12 is reverse in direction to the first rectifier cell 17, current does not flow in the solenoid valve 12 side. On the other hand, when the contact of a relay 14 of the solenoid valve 12 is closed, the solenoid valve side is controlled independently of the welding output side. By this way, portability and reliability of cables are improved as two cables will do compared with conventional four cables. |
