| 摘要 |
PURPOSE:To improve reliability at the time of failure by making a temperature regulating member enable to drive at the prescribed position which is important for air-conditioning function, through operation of a target signal generator at the prescribed end position, in a device in which the temperature regulating member is driven by an electric servo-motor. CONSTITUTION:Signal generator 7, 6 which generate a position signal corresponding to a position of an air-mixed damger (temperature regulating member) 8 and a target signal corresponding to an operation target position of the above- mentioned damper 8 respectively are provided and a current signal corresponding to the difference between output signals of both 7, 6 is impressed from a control circuit 2 on an electric servo-motor 3. In this case, when a movable element of the target signal generator 6 is moved by a control lever 9, two pairs of tandem switches 4, 5 operated in both ends A-B, C-D of the moving range of the control lever 9 are provided. And when the tandem switches 4, 5 are operated, it is so constituted that the servo-motor 3 is electrified regardless of the current signal from the control circuit 2 and the damper 8 can be driven at the position of the maximum heating or cooling. |
