| 摘要 |
PURPOSE:To detect the abnormal motor load at the normal detecting point by observing the variation state of a motor load current to reset a motor load abnormal detection value. CONSTITUTION:A CPU8 always monitors the variation in a motor current value (b) via a motor current sensor 7. Since the value (b) is analog data, it is converted by an analog/digital (A/D) converter 11, and output as digital data b' to the CPU8. When the rising start is detected, DELTAx is added to set the motor load abnormal detection value (a). If it does not exceed the threshold value stores in a memory (RAM)11 even if DELTAt is elapsed, the detected value (a) is reset at this point. When the motor current value exceeds the value within the prescribed time, the motor is inverted. |
