| 摘要 |
<p>PURPOSE:To enable the detection of the disconnection for the line connected to the contact regardless of the action of the contact, by connecting the current relay to the transfer contact. CONSTITUTION:When common terminal 11 and inactive-side terminal 12 of transfer contact 1 are closed, signal receiving relay 4 and current relay 16 are energized by power source 5 via line 6 and 7. At the same time, current relay 15 is energized by source 5 via resistance 18 plus line 10 and 8. In this case, relay 3 is deenergized. When line 6 has disconnection in transmission circuit 2, relay 3 and 4 are deenergized. When line 6 has disconnection in transmission circuit 2, relay 3 and 4 are deenergized. And relay 16 or 15 is deenergized with disconnection of line 7 or 8. Thus, the disconnection can be detected respectively.</p> |
