EP2000875A1 - Method for automatic calibration of a control unit for an adjustable fluid infeed - Google Patents
Method for automatic calibration of a control unit for an adjustable fluid infeed Download PDFInfo
- Publication number
- EP2000875A1 EP2000875A1 EP07109932A EP07109932A EP2000875A1 EP 2000875 A1 EP2000875 A1 EP 2000875A1 EP 07109932 A EP07109932 A EP 07109932A EP 07109932 A EP07109932 A EP 07109932A EP 2000875 A1 EP2000875 A1 EP 2000875A1
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- actuator
- control device
- position signal
- calibration
- control
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 239000012530 fluid Substances 0.000 title claims abstract description 9
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 230000008569 process Effects 0.000 claims description 10
- 230000000977 initiatory effect Effects 0.000 claims description 2
- 230000000007 visual effect Effects 0.000 claims 1
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 230000008859 change Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000004913 activation Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 206010000210 abortion Diseases 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 230000006386 memory function Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
- F23N1/022—Regulating fuel supply conjointly with air supply using electronic means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2227/00—Ignition or checking
- F23N2227/20—Calibrating devices
Definitions
- the invention relates to the calibration of actuators or actuators for controllable fluid supply.
- the invention relates to actuating devices with actuators, which adjust a mechanical throttle device in the fluid supply of a gas consumption device.
- the fluid supply is adjusted depending on the required operating parameters and performance requirements.
- a volume flow change of the respective fluid is made with actuators in gas or air lines and using coupled actuators or throttle devices.
- An actuator is driven with a setpoint signal, e.g. a current signal which is within a predetermined setpoint signal range (e.g., 4-20mA).
- the actuator moves the actuator or the throttle device according to the predetermined setpoint signal.
- the setpoint signal ranges are regularly fixed - the actuator is the correct implementation of the setpoint signal in an actual control value of the throttle device left.
- When frequently used in the gas use throttle as throttle devices for example, regularly rotational angle of 0 ° to 90 ° can be approached to achieve the change in volume flow.
- the setpoint specifications are to be transferred to this rotation angle range.
- an adjusting device is delivered, it is already regularly pre-calibrated to a setting range.
- Throttle end positions are limited to limit switches operated by shift cams mounted on the drive shaft, in accordance with generally accepted standards. This measure interrupts the power supply to the drive motor as soon as a corresponding end position is reached.
- the Switches fulfill in particular a safety function, since a reliable starting of the end positions must be guaranteed, for example when pre-rinsing the burner.
- an individual setting range of the actuator deviating from the delivery state is required in a fluid supply.
- a smaller range of rotation angles may be desired for a throttle.
- the cams which actuate the limit switches are set to the required setting range during commissioning by an installer.
- the actuator continues to be supplied with reference value signals in the predetermined reference signal range.
- a calibration of the actuator is required.
- the specified ranges (setpoint signal and setting range) are related by a characteristic curve (often a characteristic curve).
- the entire setting range can then be approached using the full width of the setpoint signal. It is desirable that the setpoint signal range is mapped to the entire range, which is limited by the limit switches.
- the setting by means of a potentiometer is iterative, because after each change it must be checked whether the end positions were made with the potentiometer setting.
- the drive is manually moved to the open or closed position and a memory function triggered manually in the respective positions.
- the control system can then calculate a characteristic from the predetermined values.
- the object of the invention is to simplify the calibration of an actuator for a variety of possible applications and to reduce the susceptibility to errors.
- an actuator has a control device which controls a program-controlled device, e.g. having a microcontroller.
- the actuator also has an actuator coupled to the controller.
- a mechanical throttle device is coupled to the actuator and adjustable by this in a control range between two end positions.
- the control device can be controlled by specifying setpoint signals in a predetermined setpoint signal range.
- the types of signals can be arbitrary, in particular current signals or digital signals can be used.
- the actual actuator forms part of the adjusting device and is formed from the control device with associated microcontroller and the actuator, wherein the actuator also has a drive.
- the control device controls the entire calibration process under the control of a program running in the microcontroller.
- the controller controls the actuator to move the throttle device in a first direction. During activation for movement, repeated detection of the position of the actuator by the control device takes place. In this case, by the control device, a position signal of the Actuator associated position detection system detected to determine a standstill of the actuator. This standstill will be present when a limit switch limits the end of the control range and interrupts the motor current.
- the control device detects a standstill of the actuator. The position signal is then stored as the first end position signal in the control device.
- the actuator is actuated by the control device in order to move the throttle device in a second direction.
- the position of the actuator is detected repeatedly by the control device, the position signal of the position detection system being detected by the control device. If the position signal changes by less than a second minimum value in a second period of time, the control device determines the standstill of the actuator and thus the reaching of the second end position and stores the position signal as a second end position signal in the control device.
- the control device now has two end position signals as well as the known limitations of the setpoint signal range. From the final setpoint values and the final position signals, a control characteristic or a functional relationship is calculated and stored in the control device.
- the entire predefined setpoint signal range can be used for the control and is optimally transmitted in the control device to the setting range determined during the calibration. No complex user intervention is required for the calibration and the method runs quickly, with little effort and with low susceptibility to errors.
- a particular advantage of the invention is that the signals of an already existing position sensor are evaluated. Additional monitoring of signals (eg limit switches) to detect reaching the end positions is not necessary. As an essential aspect according to the invention, therefore, the temporal evaluation of the position information used to detect the reaching of the end positions and the resulting standstill of the actuator.
- the determination of the standstill of the actuator takes place when a minimum change in position in a time interval is not detected.
- a further check of the standstill for example renewed detection of the change in position after elapse of a further period of time) can take place.
- control device monitors during the movement of the throttle device in the first and the second direction exceeding an allowable maximum duration, and aborts the method and generates an error message when the allowable maximum duration is exceeded.
- a time limit for performing the calibration is monitored. As far as e.g. If, for some reason, the adjusting movement does not come to a standstill (for example due to faulty coupling of the actuator with the actuator or faulty limit switches), the process is terminated. The termination can be displayed to a user visually or acoustically.
- the control unit when the control unit detects at the start of the calibration process that the position signal changes by less than a predetermined third minimum value in a predetermined third time period, the initial direction of movement of the actuator is reversed.
- the detected end position signals are preferably subjected to a plausibility check in the control device. It is checked whether the end position signals are within a predetermined range of values. A plausibility check will provide further assurance of proper installation and calibration. Faulty cam positions and limit switches can be detected in this way.
- FIG. 1 shows a diagram showing the representation of a characteristic change by the calibration method.
- FIG. 2a shows a flowchart of a first subsection of the calibration method according to the invention.
- FIG. 2b shows a flowchart of a second section of the calibration method according to the invention.
- FIG. 3 shows a schematic diagram of a control device according to the invention.
- the actuator is used for volume flow change in an air line of a gas burner.
- a throttle valve is used, which can limit the passage of air variable.
- the actuator has a control device with a microcontroller. With the control device, an actuator is coupled, which has an associated drive. The controller controls the actuator which is coupled to the throttle and thus changes the angular position of the throttle in the air line.
- the control cam mounted on the drive shaft are adjusted.
- the Heidelbergnokken limit the adjustment range of the throttle.
- the cams actuate when reaching an end position of a micro-switch, which defines an end position of the throttle.
- control cams are set on the drive shaft in such a way that the adjustment range of the throttle valve is limited to rotational angles of 20 ° and 80 ° (0 ° corresponds to a position of the throttle valve transversely to the flow direction, ie a closed position and 90 ° corresponds to a position parallel to the flow direction, ie an open position).
- the controller accepts set point signals in the range of 4 to 20 mA, according to a predetermined standard. This setpoint signal range should be able to be used for control over the entire setting range defined by the cam position.
- control current or the setpoint signal is entered on the abscissa of the diagram.
- the corresponding rotation angle is shown on the coordinate.
- the cams mounted on the drive shaft are set in such a way that the limit switches are approached in positions 2 and 3, ie at 20 ° and 80 °. It can be seen that the setpoint range between 4 and 8 mA as well as between 18 and 20 mA has no corresponding accessible adjustment ranges of the rotation angle.
- the characteristic curve 1 is converted into a characteristic curve 4, wherein the entire setpoint range of 4 to 20 mA covers the control range of 20 ° to 80 ° limited by the switching cams. To establish such a linear relationship, it is sufficient to define two value pairs.
- the automated method according to the invention converts the actuator from the original or delivery state into a calibrated state, wherein the corresponding characteristic curve 4 is stored in the control device.
- FIG. 2A a first section of an embodiment of the calibration method according to the invention is shown.
- the control device which controls via a Microcontroller which executes a corresponding program, the actuator for movement in the direction of the open position.
- the actuator moves at 110 in the direction of the open position and thereby rotates the coupled to the actuator throttle in the direction of increasing rotation angle. This movement maintains the controller for a predetermined period of time of X seconds, with the period being regularly between 0.5 and 5 seconds.
- the controller monitors at 120 based on the signals of a position detection, which is formed from a coupled to the drive shaft potentiometer, whether the angular position of the throttle changes. If not, proceed to step 135, which is explained below.
- the actuator continues to move the throttle under control of the controller toward the open position.
- a timeout is checked. If a predetermined acceptable period of time for reaching the open position is exceeded, an abort of the calibration process is initiated at 140 with the output of a corresponding error message.
- FIG. 2B This in FIG. 2A at position A ending diagram is in FIG. 2B continued at A.
- the control device activates the actuator at 180, in order to adjust the throttle valve in the direction of smaller rotation angle, ie in the direction of the closed position.
- the maximum total time allowed is monitored and motion of the actuator is monitored.
- the position is cached at 220 as a new minimum position.
- the controller checks for plausible data for the minimum and maximum positions be present, in particular whether they are within a permissible setting range.
- the minimum and maximum positions are stored in step 240 and the characteristic curve 4 is calculated.
- the control device has the data which minimum position is to be approached with a nominal value of 4 mA, which corresponds to a position of the throttle valve of 20 °.
- it has the information that at a setpoint of 20 mA, the maximum position is to be approached, which corresponds to an angle of rotation of 80 ° of the throttle valve.
- the method is started when the throttle is already in the open position, it is detected at step 120 that the actuator is not moving. In this case, the method is executed in steps 135, 145, 155, 175 such that first the new minimum position which corresponds to the closed position is determined and in steps 185, 195, 205, 225 a new maximum position is determined and is stored. This ensures that proper calibration can be performed from any throttle position.
- the calibration is carried out again after successful execution in order to check the reproducibility of the calibration data.
- the calibration can be time-controlled or user-triggered as often as desired.
- the actuator for external signals can be completely disabled so as not to affect the calibration.
- User control of the calibration process is not required, but data output can be made to allow a user to verify. Based on this data, faulty cam positions can be detected automatically, for example if the cam position is outside the possible working range.
- FIG. 4 shows a schematic circuit diagram of a setting device according to the invention.
- the control device 300 has a microcontroller. In the memory of the microcontroller is the program for execution stored the process of the invention. Coupled to the controller 300 is an operator interface 305 having display means and a start switch for initiating the calibration procedure. A contact strip 310 coupled to the control device has terminals for the actual value and desired value signals.
- the setpoint signals may be provided to the controller 300 in various predetermined setpoint signal ranges, eg, as current signals in the range of 4-20 mA (other signal ranges are selectable).
- the position detection system 315 which has a potentiometer and supplies position signals of a drive shaft to the control device 300.
- the position detection system is disposed on the actuator 320, and converts its rotational position in the relayed position signal.
- a contact strip 325 has various connections of the group L1.
- the terminals L1-on and L1-to serve the operation of the actuator and the throttle device, bypassing the control device.
- the L1 enable terminal provides the operating voltage for the operation of the actuator under the control of the controller. If a corresponding voltage is present at L1 enable, a corresponding signal is applied to the control device via line 330 (after suitable conversion).
- the controller then actuates the switches 335 by applying a signal on line 340, thereby excluding activation of the actuator via L1-to and L1-on.
- the controller 300 can take over the control of the actuator via the signal lines 345 and 350 and perform the calibration process.
- the limit switches S3 and S4 interrupt when performing the method when reaching the end positions of the throttle valve, the power supply of the actuator 320 via circuit one of the switch 355.
- the control for a continued movement in this direction is then inhibited and the end positions are defined.
- the control device 300 detects the standstill of the actuator via the signal of the device 315 and performs the movement of the actuator in the other direction, in which case the other of the switch 355 is actuated in the opposite end position.
- controller exclusively utilizes the location information of the device 315 to perform the calibration.
- a connection of the switch 355 with the controller 300 does not exist.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Sampling And Sample Adjustment (AREA)
- Measurement Of Radiation (AREA)
- Transplanting Machines (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Regulation And Control Of Combustion (AREA)
- Feeding And Controlling Fuel (AREA)
- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
Abstract
Description
Die Erfindung betrifft die Kalibrierung von Stelleinrichtungen bzw. Stellantrieben für regelbare Fluidzuführungen. Insbesondere betrifft die Erfindung Stelleinrichtungen mit Aktuatoren, welche eine mechanische Drosseleinrichtung in der Fluidzuführung einer Gas-Verbrauchseinrichtung verstellen.The invention relates to the calibration of actuators or actuators for controllable fluid supply. In particular, the invention relates to actuating devices with actuators, which adjust a mechanical throttle device in the fluid supply of a gas consumption device.
Im Bereich der Gasverwendung, insbesondere bei Gasbrennern, ist die Fluidzuführung je nach geforderten Betriebsparametern und Leistungsanforderungen einzustellen. Dazu wird mit Stellantrieben in Gas- oder Luftleitungen und unter Verwendung gekoppelter Stellglieder bzw. Drosseleinrichtungen eine Volumenstromänderung des betreffenden Fluids vorgenommen.In the field of gas use, especially in gas burners, the fluid supply is adjusted depending on the required operating parameters and performance requirements. For this purpose, a volume flow change of the respective fluid is made with actuators in gas or air lines and using coupled actuators or throttle devices.
Ein Stellantrieb wird dazu mit einem Sollwertsignal angesteuert, z.B. einem Stromsignal, welches in einem vorgegebenen Sollwertsignalbereich (z.B. 4-20mA) liegt. Der Stellantrieb verfährt das Stellglied bzw. die Drosseleinrichtung entsprechend dem vorgegebenen Sollwertsignal. Da Stellantriebe für eine Vielzahl von verschiedenen Anwendungen einsetzbar sein sollen, sind die Sollwertsignalbereiche regelmäßig fest vorgegeben - der Stelleinrichtung wird die korrekte Umsetzung des Sollwertsignals in einen tatsächlichen Stellwert der Drosseleinrichtung überlassen. Bei in der Gasverwendung häufig eingesetzten Drosselklappen als Drosseleinrichtungen können beispielsweise regelmäßig Drehwinkel von 0° bis 90° angefahren werden, um die Volumenstromänderung zu erreichen. Auf diesen Drehwinkelbereich sind die Sollwertvorgaben zu übertragen. Bei Auslieferung einer Stelleinrichtung ist diese regelmäßig bereits auf einen Stellbereich vorkalibriert.An actuator is driven with a setpoint signal, e.g. a current signal which is within a predetermined setpoint signal range (e.g., 4-20mA). The actuator moves the actuator or the throttle device according to the predetermined setpoint signal. Since actuators for a variety of different applications should be used, the setpoint signal ranges are regularly fixed - the actuator is the correct implementation of the setpoint signal in an actual control value of the throttle device left. When frequently used in the gas use throttle as throttle devices, for example, regularly rotational angle of 0 ° to 90 ° can be approached to achieve the change in volume flow. The setpoint specifications are to be transferred to this rotation angle range. When an adjusting device is delivered, it is already regularly pre-calibrated to a setting range.
Endlagen von Drosseleinrichtungen werden gemäß üblicher anerkannter Standards mit Endschaltern begrenzt, die von auf der Antriebswelle montierten Schaltnocken betätigt werden. Diese Maßnahme unterbricht die Stromversorgung zum Antriebsmotor, sobald eine entsprechende Endstellung erreicht ist. Die Schalter erfüllen insbesondere eine Sicherheitsfunktion, da ein verlässliches Anfahren der Endstellungen gewährleistet sein muss, zum Beispiel beim Vorspülen des Brenners.Throttle end positions are limited to limit switches operated by shift cams mounted on the drive shaft, in accordance with generally accepted standards. This measure interrupts the power supply to the drive motor as soon as a corresponding end position is reached. The Switches fulfill in particular a safety function, since a reliable starting of the end positions must be guaranteed, for example when pre-rinsing the burner.
Je nach tatsächlicher Anwendung wird jedoch ein vom Auslieferungszustand abweichender individueller Stellbereich des Stellgliedes in einer Fluidzuführung gefordert. Beispielsweise kann ein kleinerer Drehwinkelbereich für eine Drosselklappe erwünscht sein. Die Nocken, welche die Endschalter betätigen, werden bei der Inbetriebnahme durch einen Installateur auf diesen geforderten Stellbereich festgelegt.Depending on the actual application, however, an individual setting range of the actuator deviating from the delivery state is required in a fluid supply. For example, a smaller range of rotation angles may be desired for a throttle. The cams which actuate the limit switches are set to the required setting range during commissioning by an installer.
Der Stellantrieb wird jedoch, um die erwähnte breite Kompatibilität zu gewährleisten, weiterhin mit Sollwertsignalen im vorgegebenen Sollwertsignalbereich versorgt. Um den vorgegebenen Sollwertsignalbereich jedoch auf den geänderten Stellbereich des Stellantriebs bei der jeweiligen Applikation zu übertragen, ist eine Kalibrierung des Stellantriebs erforderlich. Bei der Kalibrierung werden die genannten Bereiche (Sollwertsignal und Stellbereich) durch eine Kennlinie (oft eine Kenngerade) in Beziehung gesetzt. Bei einem entsprechend kalibrierten Stellantrieb kann dann der gesamte Stellbereich unter Nutzung der vollen Breite des Sollwertsignals angefahren werden. Es ist dabei erwünscht, dass der Sollwertsignalbereich auf den gesamten Bereich abgebildet wird, der durch die Endschalter begrenzt wird.However, in order to ensure the mentioned wide compatibility, the actuator continues to be supplied with reference value signals in the predetermined reference signal range. However, in order to transfer the specified setpoint signal range to the changed setting range of the actuator in the respective application, a calibration of the actuator is required. During calibration, the specified ranges (setpoint signal and setting range) are related by a characteristic curve (often a characteristic curve). In the case of a correspondingly calibrated actuator, the entire setting range can then be approached using the full width of the setpoint signal. It is desirable that the setpoint signal range is mapped to the entire range, which is limited by the limit switches.
Da die neuen Endlagen des Stellbereichs durch die Endschalter bzw. Schaltnocken festgelegt werden, muss die Kennlinie kalibriert werden.Since the new end positions of the setting range are determined by the limit switches or switching cams, the characteristic must be calibrated.
Dies geschieht im Stand der Technik entweder durch manuelle Einstellung von Potentiometern, die Nullpunkt und Steilheit der Kennlinie bzw. Kenngeraden oder beide Endpunkte der Kennlinie festlegen, oder durch manuelle Programmierung der Kennlinienendpunkte.This is done in the prior art either by manual adjustment of potentiometers that set the zero point and slope of the characteristic or characteristic curves or both endpoints of the characteristic, or by manual programming of the characteristic endpoints.
Die Einstellung per Potentiometer erfolgt iterativ, da nach jeder Änderung zu prüfen ist, ob die Endstellungen mit der Potentiometerstellung getroffen wurden. Bei der sogenannten manuellen Programmierung wird der Antrieb manuell auf Offen- oder Geschlossen-Stellung gefahren und eine Speicherfunktion in den jeweiligen Stellungen manuell ausgelöst. Das Steuersystem kann dann eine Kennlinie aus den vorgegebenen Werten berechnen.The setting by means of a potentiometer is iterative, because after each change it must be checked whether the end positions were made with the potentiometer setting. In the so-called manual programming, the drive is manually moved to the open or closed position and a memory function triggered manually in the respective positions. The control system can then calculate a characteristic from the predetermined values.
Es ergibt sich daher das Problem, dass für eine Neukalibrierung des Stellantriebs ein Benutzereingriff in mehreren Stellungen des Stellantriebs erforderlich ist.There is therefore the problem that recalibration of the actuator requires user intervention in multiple actuator positions.
Aufgabe der Erfindung ist es, die Kalibrierung eines Stellantriebs für eine Vielzahl von möglichen Anwendungen zu vereinfachen und die Fehleranfälligkeit zu verringern.The object of the invention is to simplify the calibration of an actuator for a variety of possible applications and to reduce the susceptibility to errors.
Diese Aufgabe wird erfindungsgemäß gelöst durch ein Verfahren gemäß Patentanspruch 1 sowie eine entsprechende Vorrichtung gemäß Anspruch 10.This object is achieved by a method according to claim 1 and a corresponding device according to
Gemäß der Erfindung verfügt ein Stellantrieb über eine Steuereinrichtung, welche eine programmgesteuert arbeitende Einrichtung, wie z.B. einen Mikrocontroller aufweist. Die Stelleinrichtung hat außerdem einen Aktuator, der mit der Steuereinrichtung gekoppelt ist. Eine mechanische Drosseleinrichtung ist mit dem Aktuator gekoppelt und durch diesen in einen Stellbereich zwischen zwei Endstellungen verstellbar.According to the invention, an actuator has a control device which controls a program-controlled device, e.g. having a microcontroller. The actuator also has an actuator coupled to the controller. A mechanical throttle device is coupled to the actuator and adjustable by this in a control range between two end positions.
Die Steuereinrichtung kann durch Vorgabe von Sollwertsignalen in einem vorgegebenen Sollwertsignalbereich angesteuert werden. Die Arten der Signale können beliebig sein, insbesondere können Stromsignale oder digitale Signale verwendet werden.The control device can be controlled by specifying setpoint signals in a predetermined setpoint signal range. The types of signals can be arbitrary, in particular current signals or digital signals can be used.
Der eigentliche Stellantrieb bildet einen Teil der Stelleinrichtung und wird gebildet aus der Steuereinrichtung mit zugeordnetem Mikrocontroller und dem Aktuator, wobei der Aktuator außerdem einen Antrieb aufweist.The actual actuator forms part of the adjusting device and is formed from the control device with associated microcontroller and the actuator, wherein the actuator also has a drive.
Wird das erfindungsgemäße Kalibrierverfahren gestartet (initiiert) steuert die Steuereinrichtung unter Kontrolle eines im Mikrocontroller ablaufenden Programms den gesamten Kalibriervorgang.If the calibration method according to the invention is started (initiated), the control device controls the entire calibration process under the control of a program running in the microcontroller.
Die Steuereinrichtung steuert den Aktuators an, um die Drosseleinrichtung in einer ersten Richtung zu bewegen. Während der Ansteuerung zur Bewegung erfolgt ein wiederholtes Erfassen der Stellung des Aktuators durch die Steuereinrichtung. Dabei wird von der Steuereinrichtung ein Lagesignal eines dem Aktuator zugeordneten Lageerfassungssystems erfasst, um einen Stillstand des Aktuators zu ermitteln. Dieser Stillstand wird dann vorliegen, wenn ein Endschalter das Ende des Stellbereiches begrenzt und den Motorstrom unterbricht.The controller controls the actuator to move the throttle device in a first direction. During activation for movement, repeated detection of the position of the actuator by the control device takes place. In this case, by the control device, a position signal of the Actuator associated position detection system detected to determine a standstill of the actuator. This standstill will be present when a limit switch limits the end of the control range and interrupts the motor current.
Wenn das Lagesignal sich in einer ersten Zeitspanne um weniger als einen ersten Mindestwert ändert, erkennt die Steuereinrichtung einen Stillstand des Aktuators. Das Lagesignal wird dann als erstes Endlagesignal in der Steuereinrichtung gespeichert.If the position signal changes by less than a first minimum value in a first time period, the control device detects a standstill of the actuator. The position signal is then stored as the first end position signal in the control device.
Anschließend wird der Aktuator durch die Steuereinrichtung angesteuert, um die Drosseleinrichtung in einer zweiten Richtung zu bewegen. Es erfolgt erneut ein wiederholtes Erfassen der Stellung des Aktuators durch die Steuereinrichtung, wobei von der Steuereinrichtung das Lagesignal des Lageerfassungssystems erfasst wird. Wenn das Lagesignal sich in einer zweiten Zeitspanne um weniger als einen zweiten Mindestwert ändert, stellt die Steuereinrichtung den Stillstand des Aktuators und damit das Erreichen der zweiten Endlage fest und speichert das Lagesignal als zweites Endlagesignal in der Steuereinrichtung.Subsequently, the actuator is actuated by the control device in order to move the throttle device in a second direction. Again, the position of the actuator is detected repeatedly by the control device, the position signal of the position detection system being detected by the control device. If the position signal changes by less than a second minimum value in a second period of time, the control device determines the standstill of the actuator and thus the reaching of the second end position and stores the position signal as a second end position signal in the control device.
Die Steuereinrichtung verfügt nun über zwei Endlagesignale sowie über die bekannten Begrenzungen des Sollwertsignalbereichs. Aus den End-Sollwerten und den Endlagesignalen wird in der Steuereinrichtung eine Regel-Kennlinie bzw. ein funktionaler Zusammenhang errechnet und abgespeichert.The control device now has two end position signals as well as the known limitations of the setpoint signal range. From the final setpoint values and the final position signals, a control characteristic or a functional relationship is calculated and stored in the control device.
Auf Grundlage der so ermittelten Kennlinie kann der gesamte vorgegebene Sollwertsignalbereich für die Ansteuerung verwendet werden und wird in der Steuereinrichtung optimal auf den bei der Kalibrierung ermittelten Stellbereich übertragen. Es ist kein aufwändiger Benutzereingriff für die Kalibrierung erforderlich und das Verfahren läuft rasch, mit geringem Aufwand und bei geringer Fehleranfälligkeit ab.On the basis of the characteristic thus determined, the entire predefined setpoint signal range can be used for the control and is optimally transmitted in the control device to the setting range determined during the calibration. No complex user intervention is required for the calibration and the method runs quickly, with little effort and with low susceptibility to errors.
Ein besonderer Vorteil der Erfindung besteht darin, dass die Signale eines ohnehin vorhandenen Lagesensors ausgewertet werden. Eine zusätzliche Überwachung von Signalen (z.B. der Endschalter), um dass Erreichen der Endstellungen zu erfassen, ist nicht erforderlich. Als wesentlicher Aspekt wird gemäß der Erfindung demnach die zeitliche Auswertung der Lageinformation verwendet, um das Erreichen der Endstellungen und den dadurch verursachten Stillstand des Aktuators zu erfassen.A particular advantage of the invention is that the signals of an already existing position sensor are evaluated. Additional monitoring of signals (eg limit switches) to detect reaching the end positions is not necessary. As an essential aspect according to the invention, therefore, the temporal evaluation of the position information used to detect the reaching of the end positions and the resulting standstill of the actuator.
Die Feststellung des Stillstandes des Aktuators erfolgt, wenn eine Mindeständerung der Stellung in einem Zeitintervall nicht erfasst wird. Es kann, ausgehend von dieser Feststellung, jedoch noch eine weitere Kontrolle des Stillstandes (z.B. erneute Erfassung der Stellungsänderung nach verstreichen einer weiteren Zeitdauer) erfolgen.The determination of the standstill of the actuator takes place when a minimum change in position in a time interval is not detected. However, on the basis of this finding, a further check of the standstill (for example renewed detection of the change in position after elapse of a further period of time) can take place.
Bei einer bevorzugten Ausführungsform der Erfindung überwacht die Steuereinrichtung während der Bewegung der Drosseleinrichtung in der ersten und der zweiten Richtung ein Überschreiten einer zulässigen Maximaldauer, und bricht das Verfahren ab und erzeugt eine Fehlermeldung, wenn die zulässige Maximaldauer überschritten wird.In a preferred embodiment of the invention, the control device monitors during the movement of the throttle device in the first and the second direction exceeding an allowable maximum duration, and aborts the method and generates an error message when the allowable maximum duration is exceeded.
In dieser Weiterbildung wird ein zeitliches Limit für die Durchführung der Kalibrierung überwacht. Sofern z.B. die Stellbewegung aus irgendeinem Grunde nicht zum Stillstand kommt (z.B. durch fehlerhafte Kopplung des Aktuators mit dem Stellglied oder fehlerhafte Endschalter), ist ein Abbruch des Verfahrens sichergestellt. Der Abbruch kann einem Benutzer entsprechend optisch oder akustisch angezeigt werden.In this development, a time limit for performing the calibration is monitored. As far as e.g. If, for some reason, the adjusting movement does not come to a standstill (for example due to faulty coupling of the actuator with the actuator or faulty limit switches), the process is terminated. The termination can be displayed to a user visually or acoustically.
Bei einer bevorzugten Ausführungsform wird dann, wenn die Steuereinrichtung bei Start des Kalibriervorgangs erfasst, dass sich in einer vorgegebenen dritten Zeitspanne das Lagesignal um weniger als einen vorgegebenen dritten Mindestwert ändert, die anfängliche Bewegungsrichtung des Aktuators umgekehrt.In a preferred embodiment, when the control unit detects at the start of the calibration process that the position signal changes by less than a predetermined third minimum value in a predetermined third time period, the initial direction of movement of the actuator is reversed.
Durch kontinuierliche oder periodische Erfassung der Lagedaten wird ein Stillstand des Aktuators oder eine unregelmäßige bzw. defektbehaftete Bewegung rasch erfasst. Es kommt jedoch vor, dass die Kalibrierung in einem Zustand der Stelleinrichtung gestartet wird, in dem bereits eine Endstellung erreicht ist. Eine Bewegungsansteuerung in Richtung dieser Endstellung hat dann keine Bewegung des Aktuators zur Folge, obwohl kein Fehler vorliegt. Das Verfahren wird dann von der Steuereinrichtung erneut gestartet, wobei die anfängliche Bewegungsrichtung umgekehrt wird.By continuous or periodic detection of the position data, a standstill of the actuator or an irregular or defective movement is detected quickly. However, it happens that the calibration is started in a state of the actuator in which an end position has already been reached. A movement control in the direction of this end position then has no movement of the actuator result, although there is no error. The method is then restarted by the controller, with the initial direction of travel reversed.
Vorzugsweise werden die erfassten Endlagensignale in der Steuereinrichtung einer Plausibilitätsprüfung unterzogen. Dabei wird überprüft, ob die Endlagesignale in einem vorgegebenen Wertebereich liegen. Durch eine Plausibilitätsprüfung wird eine weitere Sicherung der ordnungsgemäßen Installation und Kalibrierung geboten. Fehlerhafte Nockenstellungen und Endschalter können auf diese Weise erkannt werden.The detected end position signals are preferably subjected to a plausibility check in the control device. It is checked whether the end position signals are within a predetermined range of values. A plausibility check will provide further assurance of proper installation and calibration. Faulty cam positions and limit switches can be detected in this way.
Die Erfindung wird nun anhand der beiliegenden Zeichnungen näher erläutert.The invention will now be explained in more detail with reference to the accompanying drawings.
Bei dem vorliegenden Ausführungsbeispiel wird der Stellantrieb zur Volumenstromänderung in einer Luftleitung eines Gasbrenners verwendet. In der Luftleitung ist eine Drosselklappe eingesetzt, welche den Luftdurchtritt variabel begrenzen kann. Der Stellantrieb weist eine Steuereinrichtung mit einem Mikrocontroller auf. Mit der Steuereinrichtung ist ein Aktuator gekoppelt, der über einen zugehörigen Antrieb verfügt. Die Steuereinrichtung steuert den Aktuator an, der mit der Drosselklappe gekoppelt ist und verändert so die Winkelstellung der Drosselklappe in der Luftleitung.In the present embodiment, the actuator is used for volume flow change in an air line of a gas burner. In the air line, a throttle valve is used, which can limit the passage of air variable. The actuator has a control device with a microcontroller. With the control device, an actuator is coupled, which has an associated drive. The controller controls the actuator which is coupled to the throttle and thus changes the angular position of the throttle in the air line.
Bei Inbetriebnahme der Einrichtung werden die an der Antriebswelle montierten Schaltnocken verstellt. Die Schaltnokken begrenzen den Stellbereich der Drosselklappe. Die Nocken betätigen beim Erreichen einer Endstellung einen Mikroschalter, welcher eine Endlage der Drosselklappe definiert.When commissioning the device, the control cam mounted on the drive shaft are adjusted. The Schaltnokken limit the adjustment range of the throttle. The cams actuate when reaching an end position of a micro-switch, which defines an end position of the throttle.
Im vorgegebenen Ausführungsbeispiel sind die Steuernocken derart auf der Antriebswelle eingestellt, dass der Stellbereich der Drosselklappe auf Drehwinkel auf 20° und 80° eingeschränkt wird (dabei entspricht 0° einer Stellung der Drosselklappe quer zur Durchflussrichtung, also einer Geschlossen-Stellung und 90° entspricht einer Stellung parallel zur Durchflussrichtung, also einer Offen-Stellung).In the given exemplary embodiment, the control cams are set on the drive shaft in such a way that the adjustment range of the throttle valve is limited to rotational angles of 20 ° and 80 ° (0 ° corresponds to a position of the throttle valve transversely to the flow direction, ie a closed position and 90 ° corresponds to a position parallel to the flow direction, ie an open position).
Die Steuereinrichtung akzeptiert Sollwertsignale im Bereich von 4 bis 20 mA, entsprechend einem vorgegebenen Standard. Dieser Sollwert-Signalbereich soll zur Ansteuerung über den gesamten durch die Nockenstellung definierten Stellbereich genutzt werden können.The controller accepts set point signals in the range of 4 to 20 mA, according to a predetermined standard. This setpoint signal range should be able to be used for control over the entire setting range defined by the cam position.
Wie in
Im Auslieferungszustand des Stellantriebs ist dieser vorkalibriert und entsprechend werden ein Steuerstrom von 4 mA mit einem Drehwinkel von 0° und ein Steuerstrom von 20 mA mit einem Drehwinkel von 90° in Beziehung gesetzt. Die entsprechende Kennlinie 1 zeigt den funktionalen Zusammenhang zwischen Sollwertvorgabe und Drehwinkel.In the delivery state of the actuator this is pre-calibrated and accordingly a control current of 4 mA with a rotation angle of 0 ° and a control current of 20 mA with a rotation angle of 90 ° are related. The corresponding characteristic curve 1 shows the functional relationship between setpoint specification and angle of rotation.
Nachdem der Stellantrieb bei der Inbetriebnahme an die jeweilige Anwendung angepasst wurde, sind die an der Antriebswelle montierten Nocken derart eingestellt, dass die Endschalter in den Stellungen 2 und 3, also bei 20° und 80° angefahren werden. Es ist ersichtlich, dass der Sollwertbereich zwischen 4 und 8 mA sowie zwischen 18 und 20 mA keine entsprechenden zugänglichen Stellbereiche des Drehwinkels aufweist.After the actuator has been adapted to the respective application during commissioning, the cams mounted on the drive shaft are set in such a way that the limit switches are approached in
Bei einer entsprechend durchgeführten Kalibrierung wird die Kennlinie 1 in eine Kennlinie 4 überführt, wobei der gesamte Sollwertbereich von 4 bis 20 mA den durch die Schaltnokken begrenzten Stellbereich von 20° bis 80° abdeckt. Um einen derartigen linearen Zusammenhang herzustellen, genügt die Festlegung von zwei Wertpaaren.In the case of an appropriately performed calibration, the characteristic curve 1 is converted into a
Das erfindungsgemäße automatisierte Verfahren führt den Stellantrieb aus dem Ursprungs- bzw. Auslieferungszustand in einen kalibrierten Zustand über, wobei die entsprechende Kennlinie 4 in der Steuereinrichtung gespeichert wird.The automated method according to the invention converts the actuator from the original or delivery state into a calibrated state, wherein the corresponding
In
Das in
Bei einer positiven Überprüfung wird in Schritt 240 eine Speicherung der Minimal- und Maximalposition vorgenommen und die Kenngerade 4 berechnet. Die Steuereinrichtung verfügt über die Daten, welche Minimalstellung bei einem Sollwert von 4 mA anzufahren ist, was einer Stellung der Drosselklappe von 20° entspricht. Außerdem verfügt sie über die Information, dass bei einem Sollwert von 20 mA die Maximalposition anzufahren ist, die einem Drehwinkel von 80° der Drosselklappe entspricht.In the case of a positive check, the minimum and maximum positions are stored in
Sofern das Verfahren gestartet wird, wenn sich die Drosselklappe bereits in der Offen-Stellung befindet, wird bei Schritt 120 erfasst, dass der Aktuator keine Bewegung ausführt. Das Verfahren wird in diesem Fall in den Schritten 135, 145, 155, 175 so ausgeführt, dass zunächst die neue Minimalposition, welche der Geschlossen-Stellung entspricht, ermittelt wird und in den Schritten 185, 195, 205, 225 eine neue Maximalposition ermittelt und gespeichert wird. Auf diese Weise ist sichergestellt, dass aus jeder beliebigen Drosselklappenstellung eine ordnungsgemäße Kalibrierung erfolgen kann.If the method is started when the throttle is already in the open position, it is detected at
Es kann vorgesehen werden, dass die Kalibrierung nach erfolgreicher Durchführung erneut ausgeführt wird, um die Reproduzierbarkeit der Kalibrierungsdaten zu prüfen. Die Kalibrierung kann zeitgesteuert oder benutzerausgelöst beliebig oft erfolgen. Während des Kalibriervorgangs kann der Stellantrieb für externe Signale vollständig gesperrt werden, um die Kalibrierung nicht zu beeinflussen. Eine Benutzerkontrolle des Kalibriervorgangs ist nicht erforderlich, jedoch kann eine Datenausgabe erfolgen, die einem Benutzer eine Überprüfung ermöglicht. Anhand dieser Daten können automatisch fehlerhafte Nockenstellungen erfasst werden, zum Beispiel wenn Nockenstellung außerhalb des möglichen Arbeitsbereiches liegen.It can be provided that the calibration is carried out again after successful execution in order to check the reproducibility of the calibration data. The calibration can be time-controlled or user-triggered as often as desired. During the calibration process, the actuator for external signals can be completely disabled so as not to affect the calibration. User control of the calibration process is not required, but data output can be made to allow a user to verify. Based on this data, faulty cam positions can be detected automatically, for example if the cam position is outside the possible working range.
In Figur 4 ist ein schematisches Schaltbild einer erfindungsgemäßen Stelleinrichtung dargestellt.FIG. 4 shows a schematic circuit diagram of a setting device according to the invention.
Die Steuereinrichtung 300 weist einen Mikrocontroller auf. In dem Speicher des Mikrocontrollers ist das Programm zur Ausführung des erfindungsgemäßen Verfahrens gespeichert. Mit der Steuereinrichtung 300 ist eine Bedienschnittstelle 305 gekoppelt, die Anzeigemittel und einen Startschalter für die Initiierung des Kalibrierverfahrens aufweist. Eine mit der Steuereinrichtung gekoppelte Kontaktleiste 310 weist Klemmen für die Ist-Wert- und Soll-Wert-Signale auf. Die Sollwertsignale können der Steuereinrichtung 300 in verschiedenen vorgegebenen Sollwert-Signalbereichen bereitgestellt werden, z.B. als Stromsignale im Bereich von 4-20 mA (andere Signalbereiche sind auswählbar).The
Mit der Steuereinrichtung ist das Lageerfassungssystem 315 gekoppelt, welches ein Potentiometer aufweist und Lagesignale einer Antriebswelle an die Steuereinrichtung 300 liefert. Das Lageerfassungssystem ist an dem Aktuator 320 angeordnet, und wandelt dessen Drehstellung in das weitergeleitete Lagesignal.Coupled to the control device is the
Eine Kontaktleiste 325 weist verschiedene Anschlüsse der Gruppe L1 auf. Die Anschlüsse L1-auf sowie L1-zu dienen dem Betrieb des Aktuators und der Drosseleinrichtung unter Umgehung der Steuereinrichtung. Der Anschluss L1-Freigabe stellt die Betriebsspannung für den Betrieb der Stelleinrichtung unter Kontrolle der Steuereinrichtung bereit. Liegt an L1-Freigabe eine entsprechende Spannung an, wird an die Steuereinrichtung ein entsprechendes Signal über die Leitung 330 angelegt (nach geeigneter Wandlung).A
Die Steuereinrichtung betätigt daraufhin die Schalter 335 durch Anlegen eines Signals auf Leitung 340 und schließt so eine Ansteuerung des Aktuators über L1-zu und L1-auf aus.The controller then actuates the
In diesem Zustand kann die Steuereinrichtung 300 über die Signalleitungen 345 und 350 die Steuerung des Aktuators übernehmen und das Kalibrierverfahren ausführen.In this state, the
Die Endschalter S3 und S4 unterbrechen bei Ausführung des Verfahrens bei Erreichen der Endstellungen der Drosselklappe die Stromversorgung des Aktuators 320 über Schaltung eines der Schalter 355. Die Ansteuerung für eine fortgesetzte Bewegung in dieser Richtung ist dann unterbunden und die Endlagen sind definiert. Die Steuereinrichtung 300 erfasst den Stillstand des Aktuators über das Signal der Einrichtung 315 und führt die Bewegung des Aktuators in der anderen Richtung aus, wobei dann in der gegenüberliegenden Endstellung der andere der Schalter 355 betätigt wird.The limit switches S3 and S4 interrupt when performing the method when reaching the end positions of the throttle valve, the power supply of the
Es ist zu beachten, dass die Steuereinrichtung ausschließlich die Lageinformationen der Einrichtung 315 verwertet, um die Kalibrierung durchzuführen. Eine Verbindung der Schalter 355 mit der Steuereinrichtung 300 besteht nicht.It should be noted that the controller exclusively utilizes the location information of the
Im Rahmen der Erfindung sind vielfältige Abwandlungen möglich. Beispielsweise ist es möglich, beliebig komplexe funktionale Zusammenhänge bei der Ermittlung der Kennlinie einzusetzen, ein linearer Zusammenhang ist nicht zwingend vorausgesetzt.In the context of the invention various modifications are possible. For example, it is possible to use arbitrarily complex functional relationships in the determination of the characteristic, a linear relationship is not necessarily required.
Claims (10)
mit den Schritten:
with the steps:
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT07109932T ATE442620T1 (en) | 2007-06-08 | 2007-06-08 | METHOD FOR AUTOMATICALLY CALIBRATING AN ADJUSTING DEVICE FOR AN ADJUSTABLE FLUID SUPPLY |
DE502007001497T DE502007001497D1 (en) | 2007-06-08 | 2007-06-08 | Method for automatically calibrating an adjusting device for a controllable fluid supply |
EP07109932A EP2000875B8 (en) | 2007-06-08 | 2007-06-08 | Method for automatic calibration of a control unit for an adjustable fluid infeed |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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EP07109932A EP2000875B8 (en) | 2007-06-08 | 2007-06-08 | Method for automatic calibration of a control unit for an adjustable fluid infeed |
Publications (3)
Publication Number | Publication Date |
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EP2000875A1 true EP2000875A1 (en) | 2008-12-10 |
EP2000875B1 EP2000875B1 (en) | 2009-09-09 |
EP2000875B8 EP2000875B8 (en) | 2009-10-14 |
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Application Number | Title | Priority Date | Filing Date |
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EP07109932A Not-in-force EP2000875B8 (en) | 2007-06-08 | 2007-06-08 | Method for automatic calibration of a control unit for an adjustable fluid infeed |
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Country | Link |
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EP (1) | EP2000875B8 (en) |
AT (1) | ATE442620T1 (en) |
DE (1) | DE502007001497D1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010066650A2 (en) * | 2008-12-08 | 2010-06-17 | Siemens Building Technologies Hvac Products Gmbh | Method for adjusting and controlling an actuating drive for a burner |
WO2022090148A1 (en) * | 2020-10-27 | 2022-05-05 | Auma Riester Gmbh & Co. Kg | Method for starting up an actuator |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4506642A (en) | 1981-12-12 | 1985-03-26 | Vdo Adolf Schindling Ag | Electric gas pedal |
US5213078A (en) * | 1989-03-25 | 1993-05-25 | Robert Bosch Gmbh | Method for determining at least one end position of a displacement device in a motor vehicle |
WO1999050580A1 (en) | 1998-03-27 | 1999-10-07 | Maxon Corporation | Intelligent valve actuator |
US6044857A (en) * | 1997-02-13 | 2000-04-04 | Erie Manufacturing Company | Electronic controller for a modulating valve |
-
2007
- 2007-06-08 AT AT07109932T patent/ATE442620T1/en active
- 2007-06-08 EP EP07109932A patent/EP2000875B8/en not_active Not-in-force
- 2007-06-08 DE DE502007001497T patent/DE502007001497D1/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4506642A (en) | 1981-12-12 | 1985-03-26 | Vdo Adolf Schindling Ag | Electric gas pedal |
US5213078A (en) * | 1989-03-25 | 1993-05-25 | Robert Bosch Gmbh | Method for determining at least one end position of a displacement device in a motor vehicle |
US6044857A (en) * | 1997-02-13 | 2000-04-04 | Erie Manufacturing Company | Electronic controller for a modulating valve |
WO1999050580A1 (en) | 1998-03-27 | 1999-10-07 | Maxon Corporation | Intelligent valve actuator |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010066650A2 (en) * | 2008-12-08 | 2010-06-17 | Siemens Building Technologies Hvac Products Gmbh | Method for adjusting and controlling an actuating drive for a burner |
WO2010066650A3 (en) * | 2008-12-08 | 2011-07-28 | Siemens Building Technologies Hvac Products Gmbh | Method for adjusting and controlling an actuating drive for a burner |
WO2022090148A1 (en) * | 2020-10-27 | 2022-05-05 | Auma Riester Gmbh & Co. Kg | Method for starting up an actuator |
Also Published As
Publication number | Publication date |
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EP2000875B1 (en) | 2009-09-09 |
DE502007001497D1 (en) | 2009-10-22 |
EP2000875B8 (en) | 2009-10-14 |
ATE442620T1 (en) | 2009-09-15 |
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