| 摘要 |
PURPOSE:To discharge the charges of a smoothing capacitor positively by the simple constitution of a device at the time of a shutdown or at the time of power interruption on abnormality by fitting a normally closed contact interlocked with an interlocking device to a discharging circuit. CONSTITUTION:An AC electromagnetic contactor 4 and a DC electromagnetic contactor 6 are brought to a closed state at the time of power interruption and at the time of the abnormality of interlocks 16, 17, and the supply of energy from an AC power supply 1 is interrupted. A driving power for a base drive circuit 11 is removed at the same time and the circuit 11 cannot be operated. Accordingly, a smoothing-capacitor residual-charge discharging circuit constituted of passive closed contacts for the AC electromagnetic contactor 4 and the DC electromagnetic contactor 6 and a smoothing-capacitor residual-charge consumption resistor 8 is mounted in order to discharge charges remaining in a smoothing capacitor 9 on power interruption and on abnormality. |
