| 摘要 |
<p>PURPOSE:To automatically discriminate the type of switching section by discriminating the type of the section according to the output of a counter which counts speed pulses and the outputs of AC and DC voltage relays. CONSTITUTION:When a vehicle enters from an AC feeding section to a no-voltage section, an AC voltage relay is deenergized, and a counter counts the output pulses of a tachometer generator. When the counted value becomes a set value, the relay is energized, its contact 23b is opened, and an auxiliary relay 15 is deenergized. Thus, a contact 15a is closed, and the trip coil 17 of the AC relay is energized. An AC/DC switch and an AC/DC converter are converted to the DC side via the interlock contact 8b of the AC relay. When the vehicle subsequently enters to a DC feeding section, a DC voltage relay is energized, and an energization coil 16 of the relay 15 and hence the AC relay is energized.</p> |
