| 摘要 |
PROBLEM TO BE SOLVED: To stop a motor in a short time when a numerical control section causes any abnormality, and to control the timing to brake the motor. SOLUTION: While a numerical controller 10 is operating, an abnormality of the numerical control section 11 is detected by an abnormality detection circuit 14. In response to an abnormality detection signal of the abnormality detection circuit 14, a motor deceleration stop control circuit 12a of a servo section 12 is actuated to perform speed control with a speed command "0", thereby stopping the motor 22. If an actual speed of the motor 22 becomes not higher than a preset speed, an off command signal for turning off a DO signal is delivered to a PMC section 13. In response to this off command signal, the PMC section 13 turns off a brake control DO or all DO signals. Thus, a brake device that is attached to the motor 22 is activated to brake the motor 22. Since the motor 22 is slowdown-and-stop controlled, it can be stopped in the shortest time. It can also set and control the timing of braking. COPYRIGHT: (C)2008,JPO&INPIT
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