| 摘要 |
PURPOSE:To enable the automatic moving control of the regenerative, the rheostatic braking corresponding to the load condition in a stringing side by a simple main circuit connection and a simple control method by a method wherein a resistance for the rheostatic braking and the series thyristor are fire controlled by a specific method. CONSTITUTION:An average value of the voltage VFC in a filter capacitor 3 is detected by a voltage detector 4 etc. using a circuit as indicated in the figure, when the said value is risen to the first set point V, the fire pulse of the prescribed minimum fire angle is given to the thyristor 7, while synchronizing with the ON OFF timing of the chopper 8. According to the level of average value of the voltage VFC is risen, the gate flowing angle comparatively enlarged, further the level is risen to the prescribed the second set value 2, the fire control of the thyristor 7 is made so as to the gate flowing angle will be the maximum gate firing angle. |
