| 摘要 |
PURPOSE:To prevent a driving power source from being overloaded and prevent a position setting mechanism from being damaged from its locked state, by stopping drive urging motion of a control object when change of an electrical signal for the control object during its drive urged state exceeds a prescribed period. CONSTITUTION:A positioning target value stored in a microcomputer ROM is transferred to an RAM and compared with a present value, measured by pulses during the driving of a motor and stored in an NRAM, to perform the drive urge of a control object until the both target and present values coincide with each other. At this time, a motor lock detecting timer is triggered by a microcomputer, if a pulse is output from a rotary encoder within a certain length of time, it is decided that the motor is urged interlocking to a mechanism, and the detecting timer is reset and again triggered. If the detecting timer becomes a time-over state before the pulse is output, a decision, that the motor is urged not interlocking to the mechanism, is performed to reset urging the motor. |
