| 摘要 |
PURPOSE:To easily judge whether a faulty section is a load or power source, by monitoring even the power source by a monitoring circuit when a monitor signal output part which uses the load and power source in common is provided. CONSTITUTION:When a signal ''1'' appears at the output terminal T1 of a control circuit C, an inverter IN outputs a ''0'' and a photocoupler PC1 turns on. Then, a transistor TR1 turns on and a TR2 turns off to turn off a photocoupler PC2, so that a monitor signal S is a ''1''. Once the voltage of a load power source E2 drops, the photocoupler PC1 never turns on, so the monitor signal S falls to a ''0''. A photocoupler PC3, however, turns off as well at this time, so a power source monitor signal S' goes up to a ''1'', reporting the fault of the load power source E2. |
