| 摘要 |
<p>PURPOSE:To enable the detection for the disconnection of the line connected to the content regardless of the action of the contact, by connecting the voltage relay to the constant open contact for signal generation. CONSTITUTION:When constant open contact 1 is inactive, signal receiving relay 3 is excited by power source E<+> via resistance 4. Furthermore, voltage relay 5 is also excited by E<+> via resistance 4, transmission circuit 2 plus terminal 11 and 12 of contact 1. If circuit 2 has disconnection under these conditions, only relay 5 is deenergized to result in the detection of the disconnection. With disconnection of line 6 or 7 when contact 1 is active, relay 3 is excited with relay 5 unexcited to detect the disconnection.</p> |
