| 摘要 |
PURPOSE:To prevent a remote device from being closed again after a power supply is opened by a remote controller by connecting in series the contact of a relay of the CPU side which is remote controlled and the contact of a relay connected to the close circuit side of a manual changeover switch. CONSTITUTION:When a manual switch MSW is connected to contacts 2, 4 and 6 adversely to a case shown in the diagram, a diode D2 is biased forward to actuate a relay RLS. Then a contact rls is closed, and a relay rlt is closed after a relay RLT is turned on. Then the relay RLT is self-held, and the power supply circuit of a device TM is closed. Here a CPU performs a remote control to make the relay RLR conduct and to open a contact rlr. Thus the relay RLT is also inactivated, and the contact rlt is opened. Then the working power supply of the relay RLR is disappeared, and therefore the power supply circuit is never closed again even if the contact rlr is closed again since both contacts rls and rlt are opened. |
