A drive unit is provided, particularly a drive unit for operating flow-control valves, comprising a housing, an electrical input, an electromechanical converter assembly, a mechanical output, and an electronic controller. The controller comprises an input unit having at least one pushbutton, which p
A drive unit is provided, particularly a drive unit for operating flow-control valves, comprising a housing, an electrical input, an electromechanical converter assembly, a mechanical output, and an electronic controller. The controller comprises an input unit having at least one pushbutton, which penetrates the housing and can be depressed against the action of a restoring device, and comprises a contactless switch that is actuated by the at least one pushbutton. A mechanical stop independent of the switch itself is associated with the position of the pushbutton that actuates the switch.
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1. A drive unit (3), especially for actuation of flow-regulating valves (2), comprising a housing (4), an electrical input (5), an electromechanical transducer group (69), a mechanical output (6) and an electronic controller, wherein the controller has an electronic display (10) and comprises an inp
1. A drive unit (3), especially for actuation of flow-regulating valves (2), comprising a housing (4), an electrical input (5), an electromechanical transducer group (69), a mechanical output (6) and an electronic controller, wherein the controller has an electronic display (10) and comprises an input unit (8) with several pushbuttons (9) that penetrate the housing (4), are disposed adjacent to the display (10) and can be depressed against the action of a restoring device (26), characterized by contactless switches (36) actuated by the pushbuttons (9), wherein mechanical stops (29, 52, 55, 59) independent of the switches (36) themselves are assigned to the positions of the pushbutton (9) actuating the switches (36), wherein further the assignment of the switching functions active in the controller to the individual pushbuttons (9) can be varied and the display (10) comprises an operating-information area (63) and at least one actuation-information area (64) adjacent to the pushbuttons (9), wherein the current assignment of the function to the individual pushbuttons (9) is indicated in the actuation-information area (64), andwherein the electromechanical transducer group (69) comprises an electrofluidic first transducer stage (70) and a fluid-mechanical second transducer stage (71). 2. The drive unit of claim 1, wherein at least one switch (36) is of optical design, especially by comprising a photoelectric barrier (35). 3. The drive unit of claim 1, wherein at least one switch (36) is disposed directly on a printed-circuit board (38) supporting further components (39) of the electronic controller. 4. The drive unit of claim 1, wherein the housing (4) is of explosion-protected design and the pushbuttons (9) are sealed relative to the housing (4) by means of an explosion-protected sealing system (53). 5. The drive unit of claim 4, wherein the sealing system (53) is of cascade-like design and comprises at least one double seal (54). 6. The drive unit of claim 1, wherein the restoring device (26) comprises a two-stage restoring-spring unit (46) acting in the manner of a pressure point. 7. The drive unit of claim 1, wherein the mechanical stop (55, 59) is adjustable. 8. The drive unit of claim 1, wherein an installation-position sensor (68) is provided, wherein the switching functions are automatically allocated in the controller to the individual pushbuttons (9) in a manner dependent on the signal of the installation-position sensor. 9. The drive unit of claim 1, wherein an installation-position sensor (68) is provided, wherein the orientation of the indication of operating information in an operating-information area (63) of the display (10) is determined automatically depending on the signal of the installation-position sensor. 10. The drive unit of claim 1, wherein the display (10) has an oblong format and at least two pushbuttons (9) are provided, which are disposed in groups on two short sides of the display (10), while the display (10) has a central, substantially square operating-information area (63) and two laterally disposed actuation-information areas (64). 11. The drive unit of claim 1, wherein the controller is provided with an external hard-wired communications interface (65) as well as with an interface for wireless data transmission. 12. The drive unit of claim 1, wherein a mode-of-operation switch (13), which acts on the controller and preferably can be mechanically interlocked, is mounted on the housing (4). 13. A drive unit (3), especially for actuation of flow-regulating valves (2), comprising a housing (4), an electrical input (5), an electromechanical transducer group (69), a mechanical output (6) and an electronic controller, wherein the controller has an electronic display (10) and comprises an input unit (8) with several pushbuttons (9) that penetrate the housing (4), are disposed adjacent to the display (10) and can be depressed against the action of a restoring device (26), characterized by contactless switches (36) actuated by the pushbuttons (9), wherein mechanical stops (29, 52, 55, 59) independent of the switches (36) themselves are assigned to the positions of the pushbutton (9) actuating the switches (36), wherein further the assignment of the switching functions active in the controller to the individual pushbuttons (9) can be varied and the display (10) comprises an operating-information area (63) and at least one actuation-information area (64) adjacent to the pushbuttons (9), wherein the current assignment of the function to the individual pushbuttons (9) is indicated in the actuation-information area (64), andwherein the restoring device (26) comprises a two-stage restoring-spring unit (46) acting in the manner of a pressure point.
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