| 摘要 |
PURPOSE:To prevent abnormal braking under running from being generated, by inhibiting the chopping conduction of a magnet brake when a driving motor is set in an over-current state, and by executing continuous conduction. CONSTITUTION:When accelerator signals CH1 and CH2 come together to an L, then signal V4 comes to an H, and signal V5 is slowly increased. Then, for a specified time, current is continuously conducted to a magnet brake coil 10, and a brake is worked. After the lapse of the specified time, the rise of the signal V5 is performed, and so by chopping signal from a comparator 8, chopping conduction is executed on the magnet brake coil 10. In the meantime, when the current of driving motors 14, 15 comes to a set value or more during running, then signals V11, V12 come to an L. Then, the signal V5 is lowered, and the continuous conduction is executed on the magnet brake coil 10, and the working of the brake is suppressed.
|
