| 摘要 |
PROBLEM TO BE SOLVED: To provide a numeric control system enabling the detection of an abnormality of analog voltage of speed command for analog axis control. SOLUTION: An analog amplifier 20 controls a motor 23 proportionately to the analog voltage of speed command outputted from the numeric control system 10. The analog voltage of the speed command is converted to a digital value by an A/D converter to feedback to a CPU 11, which turns off an enable signal, turns on an emergency stop signal, and stops power supply to the analog amplifier 20 when the digital value of the feedback output speed command is out of the preset range, while invalidating the speed command directed to the analog amplifier 20 and controlling the velocity of the motor 23 to be zero. Herewith, an abnormality of the speed command directed to the analog amplifier 20 is detected and the motor is stopped to prevent the malfunction of the motor, thereby the system is safe. COPYRIGHT: (C)2006,JPO&NCIPI
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