| 摘要 |
PURPOSE:To eliminate the mechanical wear part and thus to increase the lifetime of a speed setting device, by using an A/D converter, a digital counter and a signal sudden change detector. CONSTITUTION:In a speed setting device 1, an analog signal Ai supplied from a PID adjuster 3 is converted into a digital signal Di through an A/D converter 11 and then delivered to a digital counter 12 and a signal sudden change detector 13. The counter 12 has a switch SW plus speed change command contacts S1 and S2. At the same time, the counter 12 supplies the signal through the converter 11 and the detector 13 and then feeds a digital signal D0 back to the output/ input side of a D/A converter 14. The converter 14 converts the signal D0 into an analog signal A0 to deliver it to a motor control device 6. |
