| 摘要 |
PURPOSE:To set an origin automatically by setting a memory element with a pulse, opening a servocontrol loop, moving a controlled system to the origin direction, resetting the element upon arriving of the control system at the origin, and closing the loop thereby positioning the control system. CONSTITUTION:A servocontrol loop controls a closing position when a switch element 11 is held closed at a contact 11a side. An encoder 2 in this stage detects the position incrementally as a pulse-like alternating signal. On the other hand, a memory circuit 13 is set by the pulse applied upon turning on of an electric power surce or by manual switching, then the element 11 is closed to the contact 11b side to open the servocontrol loop. Then, a servocontrol motor 1 drives the movable part of the controlled system toward the origin. The arrival of the movable part at the origin is detected with an origin detection sensor 18 and the memory element 13 is set. Then, the setting of the origin is accomplished in the sequence similar to the sequence in the stage of turning on the power source by the external signal and manual switch. |
