| 摘要 |
PURPOSE:To bumplessly switch to automatic control from manual control, by setting a bias value added to a proportional or proportional and differential operation output, at the time of the manual control, by use of a holding circuit. CONSTITUTION:At the time of manual control, a switch SW is set to on (M side), a difference between a manual control signal YM and a control operation output YA is provided to a holding circuit 9, and at the time of automatic control, the switch SW is set to off (A side, in case when a means 10 is not provided), and also a hold value of the circuit 9 is added as an output bias value B to the output YA. Accordingly, an operation output MV in case when manual control has been swithced to automatic control becomes the sum of the output YA and the output B, and even if there is a control deviation (e), bumpless switching can be executed. Also, when the means 10 for applying positive or negative voltage E to the input side of the circuit 9 is provided, and it is added selectively, the bias value B can be increased or decreased. In this way, proportional and proportional and differential operating actions are executed. |
