| 摘要 |
PROBLEM TO BE SOLVED: To improve the precision of positioning control after the resumption of servo ON by minimizing the dropping amounts (moving amounts in a gravitational direction) due to gravity of a control shaft in a servo OFF time due to emergency stop, and performing position control after the resumption of the operation by using the position where the control shaft is present in the servo OFF time as a reference. SOLUTION: This system is provided with a means for continuing servo lock in an ON state until an electromagnetic brake built in a servo motor is allowed to sufficiently function when an emergency stop instruction is applied to a pulse distributing part and a means for turning the servo lock into an ON state in almost the same timing as that in which the electromagnetic brake is turned OFF when an operation resumption command is applied to the pulse distributing part. Thus, it is possible to minimize the dropping amounts of the control shaft. Also, this system is provided with a means for temporarily storing the present position just before the servo OFF in a memory in the servo OFF time and a means for performing automatic restoration to the position where the control shaft is present in the servo OFF time by using the storage position as a target position when the operation resumption command is applied, and the servo ON is restored again.
|
