| 摘要 |
PURPOSE:To indicate abnormality of power source with high reliability by controlling power supply from a rectifying section to an abnormality, indicating section corresponding to the voltage level of the power source. CONSTITUTION:A rectifier 1 rectifies AC power fed from an external AC power source. An abnormality indicating section 2 is brought into abnormality indicating state corresponding to the power supply state from the rectifying section 1. A switch section 2 is turned ON, OFF corresponding to the source voltage of a power source for an object to be monitored, thus controlling power supply from the rectifying section 1 to an abnormality indicating section 3. The switch section 2 detects abnormality of source voltage, which is indicated on the abnormality indicating section 3. Power is fed to the abnormality indicating section 3 only through the rectifying section 1. |
