| 摘要 |
PURPOSE:To permit the offset to be automatically cancelled by proaiding a converter to output the target speed voltage from a forward/reverse setting circuit to a control section through a level shift voltage detection circuit and a converter to output the offset regulation voltage correcting the target speed voltage. CONSTITUTION:In an offset automatic regulation mode, let the offset regulation value H and the difference quantity be zero by an offset regulating DA converter 20 and a target setting DA converter 12, and let a servo loop be turned OFF. Then, a forward seek mode and a reverse seek mode are set one after another and the target speed voltage in each mode is measured. The offset regulation value H is then changed from zero to increasing and decreasing directions. When the target speed voltage exceeds the premeasured target speed voltage, the offset change quantity is detected. Depending on the detected offset change quantity, the offset regulation quantity is then decided. |
