| 摘要 |
PURPOSE:To prevent a trouble form occurring by charging smoothing condenser through a resistor when a power source is applied and generating an abnormal signal when the charging time is shorter than the prescribed value. CONSTITUTION:When a power source switch 1 is closed, a smoothing condenser 3 is charged through a resistor 12. A charging time measuring circuit 14 measures the charging time of the condenser 3. A control circuit 5 monitors the charging time, and outputs an abnormal signal when the charging time is shorter than the prescribed time. This abnormal signal stops the ordinary operation of a cage 9 or generates an alarm with an indicator lamp or the like, thereby exchanging the condenser 3 before the cage 9 cannot serve in normal state. |
