EP2732748B1 - System zur erkennung von motorausfällen bei geschirrspülmaschinenpumpen, sowie zugehöriges verfahren - Google Patents

System zur erkennung von motorausfällen bei geschirrspülmaschinenpumpen, sowie zugehöriges verfahren Download PDF

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Publication number
EP2732748B1
EP2732748B1 EP13192913.5A EP13192913A EP2732748B1 EP 2732748 B1 EP2732748 B1 EP 2732748B1 EP 13192913 A EP13192913 A EP 13192913A EP 2732748 B1 EP2732748 B1 EP 2732748B1
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European Patent Office
Prior art keywords
pump
sensor
vibration
machine
pumps
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EP13192913.5A
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English (en)
French (fr)
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EP2732748A1 (de
Inventor
William T. Watson
Björn S. Himmelsbach
Thomas Plewnia
Kevin J. Carrington
Stanislaw Piotrowski
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Premark FEG LLC
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Premark FEG LLC
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    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/42—Details
    • A47L15/4214—Water supply, recirculation or discharge arrangements; Devices therefor
    • A47L15/4225—Arrangements or adaption of recirculation or discharge pumps
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L15/00—Washing or rinsing machines for crockery or tableware
    • A47L15/0018—Controlling processes, i.e. processes to control the operation of the machine characterised by the purpose or target of the control
    • A47L15/0049—Detection or prevention of malfunction, including accident prevention
    • A—HUMAN NECESSITIES
    • A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47L—DOMESTIC WASHING OR CLEANING; SUCTION CLEANERS IN GENERAL
    • A47L2401/00—Automatic detection in controlling methods of washing or rinsing machines for crockery or tableware, e.g. information provided by sensors entered into controlling devices
    • A47L2401/32—Vibration or sound detection

Definitions

  • This application relates generally to a method of monitoring a pump in a warewash machine, the pump being arranged for delivering liquid to one or more nozzles for spraying on wares, the method comprising utilizing a sensor mounted on the machine to detect pump vibrations.
  • a method is known from documents: DE 196 18 498 , US 2009/0056773 , DE 100 65 677 , DE-A-198 28 871 .
  • Document EP 0 321 295 discloses a system and a method of detection of a pump failure by means of analysis of pump motor vibration level.
  • wash arms are typically located on the top and bottom of the washing chamber to wash wares located in a dish rack by directing a washing solution out of nozzles located on the arms.
  • the sprayed washing solution is typically a recirculated solution that, once sprayed, falls and collects in a sump below the chamber, is drawn from the sump through a strainer by a pump and is pushed by the pump along a flow path into the wash arms and then out through the nozzles.
  • One or more rotatable rinse arms may also be provided for spraying fresh rinse liquid and, in some cases, the rinse liquid delivery system includes its own associated pump.
  • wares are moved through a chamber (e.g., via a conveyor that moves racks of wares or via a conveyor with flights that hold wares) with multiple spray zones (e.g., a pre-wash zone, a wash zone, a post-wash or pre-rinse zone and a final rinse zone, each having respective nozzles) as they are cleaned.
  • a chamber e.g., via a conveyor that moves racks of wares or via a conveyor with flights that hold wares
  • spray zones e.g., a pre-wash zone, a wash zone, a post-wash or pre-rinse zone and a final rinse zone, each having respective nozzles
  • Each wash zone typically includes its own recirculation system having a tank and a recirculation line with a pump to feed liquid from the tank to one or more spray arms with nozzles (e.g., upper and lower arms) in the zone.
  • Spray in the final rinse zone may be controlled by line pressure or,
  • the pumps may eventually fail, requiring replacement.
  • the warewash machine is temporarily out of commission, placing a serious strain on the commercial establishment (e.g., a cafeteria, restaurant, catering facility or other type dining and/or cooking facility) to effectively clean wares (e.g., dishes, cutlery, pots, pans and glasses) in a timely manner.
  • wares e.g., dishes, cutlery, pots, pans and glasses
  • This application encompasses a sensing system that is capable of monitoring sensed signals from mechanical liquid pumps used on a warewash machine.
  • the sensed phenomenon may be directly related to the mechanical vibration of the pump.
  • the signals obtained through such monitoring are processed in a manner that allows some major failure modes of a pump to be detected prior to complete failure of the pump so that the pump can be replaced at a convenient time prior to an unplanned loss of use of the warewash machine.
  • an accelerometer or velocity sensor is mounted to the machine and provides a single-valued real-time output signal indicative of the vibration magnitude over a range of frequencies, where increased vibration may be an indication of upcoming mechanical failure.
  • this sensor band-passes the vibration signal to provide an indication of vibration using primarily signal frequency components from about 400 to 1000Hz.
  • the sensor will only have a single sensing axis that should be mounted so that this sensitive axis is aligned with the direction anticipated for greatest vibration. For a pump or rotating motor, this axis is usually along a radial direction outward from the main rotating shaft.
  • the sensing system monitors the vibrating machinery continuously when it is operational.
  • the sensing system may be preset to provide an alert when the total vibration signal exceeds some preset level or the signal may simply be sent to some monitoring and control system that can interpret the signal.
  • Our warewash machine system in its most complete embodiment includes one or more sensors capable of detecting mechanical vibrations (e.g., sensor may include at least a vibration transducer, processor, memory, analog-to-digital converter, and a digital communication circuit), a housing for the sensor(s), electrical connections between the sensor(s) and a power source, an external processor with nonvolatile memory in communication with the sensor(s), a controller that can control the power to warewash pumps/motors, and sensors and/or logic that recognize the state of the warewash liquid drain and fill for a sump or tank.
  • sensors capable of detecting mechanical vibrations
  • sensor may include at least a vibration transducer, processor, memory, analog-to-digital converter, and a digital communication circuit
  • a housing for the sensor(s) electrical connections between the sensor(s) and a power source
  • an external processor with nonvolatile memory in communication with the sensor(s)
  • a controller that can control the power to warewash pumps/motors
  • sensors and/or logic
  • the sensing system may be capable of measuring the total magnitude and direction of the acceleration, or vibration signal.
  • a tri-axial micro-electro-mechanical system (MEMS) accelerometer may be used to obtain acceleration along three orthogonal axes.
  • MEMS micro-electro-mechanical system
  • the sensor does not need to be mounted in line with an expected primary vibration axis. This makes sensor placement more flexible in terms of position and orientation and also means that the accuracy of the mounting placement is much less important.
  • the sensor may not need to be mounted directly on the pump or motor at all.
  • the pump or motor is often mounted to a water tank (made of thin walled material, such as stainless steel sheet) or to a relatively thin plate (also often made of stainless steel).
  • Much of the vibrations or vibrational energy in the pump or motor will be transferred through the mounting surfaces and fasteners into the tank wall or mounting plate. It is possible to mount the sensor on the tank wall or mounting plate, preferably near a mounting surface or fastener, and sense the pump/motor vibration levels indicative of pump condition and potential failure.
  • the omnidirectional sensing allows the sensor to sense the total magnitude of vibration superimposed on the mounting surface, along many directions, when the vibrational energy is transferred to that surface. This sensing enables the system to still derive a measure of the total vibration energy produced by the pump/motor.
  • Figure 1 shows some potential mounting arrangements for a sensor.
  • Figure 1 shows a pump 1 with a sensor mounted on the pump motor case with two threaded studs at a first location 2.
  • Figure 1 shows second, third and fourth potential locations for mounting the sensor.
  • the sensor In a second potention mounting location 3, the sensor is mounted on a pump mounting plate 6 by means of two threaded studs. In a third potential sensor mounting location 4, the sensor is mounted on the tank of the dishwasher near the pump mating surface 7 by means of two threaded studs. In another potential sensor mounting location 5, the senosr could be mounted on the respective pump motor case 8 by means of two threaded studs
  • the pumps are pumping a highly variable liquid.
  • the primary component is usually tap water, but the liquid will often also contain detergents and food soils of varying composition and concentration.
  • the vibration experienced by the pump can vary greatly due to the chemical and mechanical properties of this liquid. Some conditions can cause foaming or cavitation of the liquid in or near the pump causing very different vibration levels and frequencies than are experienced by pumping clean water, for instance.
  • the vibration signals may sometimes be difficult to differentiate from those expected from imminent pump failure and the exact condition of the liquid is usually unknown after the machine is placed into operation.
  • the system and method may be implemented can monitor when the warewasher is drained of used/soiled liquid and when it is refilled with clean water.
  • Such a drain and refill may typically occur at times such as (i) the end of the day when the machine is shut down, (ii) the start of the day when the machine is turned on, (iii) after a predefined number of hours of operation or (iv) upon detecting an unacceptably high soiling of water using a soil detection sensor.
  • the system/method can analyze or acquire vibration sensing information to be used for pump failure detection after the machine has been drained and refilled with fresh water (e.g., upon system startup). In this manner our system will avoid potential false positive detections of a failing pump that might be triggered by analyzing the vibration levels when liquid is highly soiled or foamed..
  • a warewasher often has more than one pump or other motors installed.
  • the typical machine configuration does not effectively isolate vibrations between the pumps and therefore the vibration signature at each pump may be affected by some partial superposition of vibrations generated by any other running pumps or motors.
  • the system and method determines or otherwise recognizes the ON/OFF status of all pumps and motors and/or other vibration generating equipment on the machine. In this manner, the system/method can be operated to assure that the vibration monitoring and analysis for any given pump is achieved in a consistent manner (i.e., under the same overall machine operating conditions) to reduce the likelihood that some variation in machine operating condition affects the vibration analysis.
  • the system has one sensor dedicated to each pump (although in some machines it may be possible to use one sensor to monitor more than one pump).
  • the system may choose to only analyze or acquire vibration sensing information to be used for pump failure detection of a given pump only when the given pump under evaluation is ON (e.g., when all other pumps in the machine are turned OFF).
  • each pump in the machine may be turned on, one-at-a-time, during startup, after the liquid has been drained and replaced with clean water, and vibration sensing information will be used from the sensor associated with the particular pump that is ON to assess its condition.
  • Each single pump evaluation may only require a small time period (e.g., a few seconds), but to improve the consistency and accuracy of the evaluation the pump vibration signal associated with each pump may be monitored for about 1 minute or longer.
  • each pump vibration sensor may have an associated baseline vibration against which future readings are analyzed or compared, with the baseline likewise having being defined and stored when only that one pump was ON and operating.
  • the system/method may evaluate or at least screen all pumps at the same time.
  • This initial screening could reduce machine startup time, assuming that no pump appears to have elevated vibration levels.
  • all pumps might be started and operated simultaneously, with their respective vibration signals simultaneous collected for some time period. If any of the pumps shows potentially elevated vibration levels, then the controller could choose to evaluate that pump more carefully by operating it alone.
  • the baseline vibration level for each pump for the purpose of the screening may likewise be defined when all of the pumps are ON and operating.
  • each pump may have two associated baseline vibration levels, one for the initial screening (determined when all pumps were operating) and one for more focused single pump screening (determined when only that one pump was operating).
  • New/different pumps of the same type and model will generally not have identical vibration signatures. Variations in the pumps due to tolerances in the shaft, bearings, electric motor, assembly process, and other mechanical variations will sometimes lead to significant variations in the vibration levels when, for example, a new pump is installed on a warewash machine to replace an old pump.
  • the system/method may record the initial sensed vibration levels after new pump installation and store that information as a new baseline vibration for the pump. These initial/baseline levels are then compared with future vibration levels, looking for changes (increases) in the vibration levels in order to detect imminent pump failure.
  • the absolute vibration level for indication of potential pump failure should not, in most cases, be preset prior to pump installation, but instead can be tailored to each pump based upon its baseline vibration level when newly installed (at the time of original warewash assembly or after pump replacement in the field). Tailoring the pump failure detection algorithm thresholds to each pump as newly installed on the warewash machine provides a more reliable and potentially earlier detection of a potential imminent failure.
  • the vibration sensor is based upon a tri-axial MEMS accelerometer.
  • vibrations sensors could be used to monitor vibration in the system. These sensors could include, but are not limited to, microphones (sensing acoustic pressure variations), nanoelectromechanical system accelerometers, optical accelerometers, electrodynamic velocity sensors, laser vibrometers, piezoelectric or piezoresistive type accelerometers.
  • microphones sensing acoustic pressure variations
  • nanoelectromechanical system accelerometers optical accelerometers
  • electrodynamic velocity sensors laser vibrometers
  • piezoelectric or piezoresistive type accelerometers piezoelectric or piezoresistive type accelerometers.
  • a single microphone could be positioned to detect sounds generated multiple pumps, one-at-a-time, to infer the magnitude of the vibration exhibited by that pump.
  • Sensing technologies that measure vibration of the surface to which they are mounted should use a reliable and mechanical stable linkage (machine structure) that could transmit appropriate vibration signals while maintaining a consistent transmission coefficient over the frequencies of interest.
  • a single vibration sensor could be positioned at a location intermediate two pumps (e.g., where two pumps are mounted on the same plate the sensor could likewise be mounted on the plate). In this arrangement the single sensor could report vibration levels for a first of the pumps when only the first pump is operating and could report vibration levels for a second of the pumps when only the second pump is operating.
  • the senor can be set by software to immediately change its sensing range to any one of ⁇ 2g, ⁇ 4g, ⁇ 8g, or ⁇ 16g.
  • the number of bits providing the resolution of the system is constant, such that choosing a smaller sensing range provides finer absolute resolution of the sensed signals.
  • the minimum resolution of the ⁇ 2g range given an 8-bit analog to digital converter will be about 0.0156g, while the resolution of the ⁇ 4g sensing range will be about 0.0313g.
  • Finer resolution usually allows for the detection of smaller changes in the vibration signal, especially at higher frequencies where the vibration signal may be smaller. Choosing a larger range allows larger vibration signals to be measured accurately without experiencing significant instances where the physical signal exceeds the maximum range of the sensor, often known as signal clipping.
  • the sensing system may be configured to continuously monitor the sensed vibration levels, and adjust the sensor to a nearly optimal acceleration sensing range in real time.
  • the maximum range of the sensor is dynamically changed by increasing to the next wider available range.
  • the maximum range of the sensor is dynamically changed by decreasing to the next narrower available range.
  • the sensing time interval could vary widely, but might be on the order of 0.5s and the predetermined number of sensing time intervals used to make a change in the sensing range could also vary widely, but might be on the order of 10 intervals for a total of 5 seconds.
  • the accelerometer should be sampled at a rate high enough to enable some reconstruction of the amplitude of the vibration signal at frequencies up to about 1000Hz. A minimum sampling rate of about 5kHz on all three axes should be sufficient to achieve excellent pump failure detection, but is not required.
  • the sensor may measure vibration in each of the x, y, and z directions at a rate of at least 5kHz but need not use this raw data to evaluate the pump's condition. Instead, for each sample a representative magnitude may be calculated and at the end of a predetermined time period of, for example, 0.5 seconds, the average of those magnitudes is taken.
  • This provides a simple way to capture a representation of the vibration magnitude of the pump without having to calculate the actual magnitude of the vibration, which is much more computationally intensive and could require more powerful devices to be able to process real-time.
  • Using this method for evaluating the pump condition has further benefits in that a single value represents the pump's condition. This is in contrast to a curve shape, specific vibration frequency, time in between peaks or other possible classification methods. Benefits of using a single value to classify the pump condition include that it requires very little memory storage for significant record keeping of pump historical data and requires little computing bandwidth to compare with another vibration sample.
  • the system/method may be implemented to ignore this initial spike in vibration level when calculating the vibration level. For example, any vibration data during the first few seconds of pump operation may simply be ignored.
  • the system/method may be implemented such that pump vibration can be monitored at any particular time when power is available, and therefore the system/method can also be used to detect if each pump is actually ON or OFF. While more precise evaluation of the pump vibration level may not be possible at all times, the system will generally be capable of confirming whether a give pump is generally rotating or not, even with any combination of other motors/pumps ON.
  • a plastic housing in conjunction with a potting compound, should provide those protection functions along with allowing the sensor to be rigidly attached to the warewash machine.
  • the PCB may be glued to and/or potted against a flat surface 10 within the housing. Where the PCB uses through-hole components (e.g., a large LED that protrudes through the housing at LED hole 13) and connections, the portion of the board with these features are co-located.
  • the housing 11 may additionally include means 14 for strain relief of the electrical cable 15.
  • the means 14 may be constructed as an S-shaped channel. This PCB undercut region in the housing will fill with potting material during sensor assembly.
  • the housing is made by plastic injection molding
  • uniform cooling is partially achieved by uniform part wall thickness
  • the outside of the housing at the PCB undercut region is elevated to maintain more uniform wall thickness in this area.
  • Uniform cooling leads to a part that experiences less warping or mechanical tolerance variations in important parameters, such as flatness of the mounting surface.
  • the senor may be designed to accept a wide voltage supply range of, for example, 10-30VDC.
  • the sensor may be configured such that data and parameters can be stored on board the sensor in non-volatile memory.
  • Data may be stored in a peripheral memory chip (e.g., not in the CPU itself) and is saved as it becomes available, having no static location for the most recent received data. This allows data to easily be retrieved via an "address" that is in reference to the most recently stored data, in contrast to an absolute address or an address in reference to the first piece of stored data.
  • Calibration values and other important sensor configurations may be stored within the MCU flash for immediate access and static addressing. In this way communication with the peripheral memory chip is not required for sensor start-up and initialization, eliminating initialization errors due to communication glitches.
  • Sensor configurations may be programmed and saved in non-volatile memory via a communication bus, such as Modbus.
  • Bus messages may be variable in length, according to the type of command issued. These commands can be automated in nature, or issued by a person using the human machine interface of the warewash controller to generate a command through the communication bus. This allows for system auto-correcting of measurement settings as well as manual configuration, all without needing to program the sensor with new code, yet enabling retention of the altered settings even with power removed from the device.
  • the sensors may have an auto-addressing scheme to allow self-configuration of the sensors' address upon installation onto a machine, so that each may be talked to individually by the machine's controller.
  • Each sensor will be manufactured with the same default bus address (e.g., address 01).
  • address 01 e.g.
  • each sensor could be re-addressed with a predetermined address according to the pump upon which it will be mounted using a programmer explicitly for this setup purpose.
  • the technician When replacing a sensor in the field, the technician must swap out the sensor and initiate a replace sensor process with the machine controller.
  • the machine controller will then identify which addresses are currently in use by the sensors on the bus. Based on the information received, the controller will then assign a unique address to the newly installed sensor according to which non-default address is available.
  • all sensors could have a default address of 01. If, in a particular machine, the controller logic is configured to expect the sensors associated with its installed pumps to be addressed 10, 11, 12, 13, and 14. Assume sensor 11 is removed and replaced with a new sensor, then when the technician initiates a replace sensor logic process of controller, the controller will identify the sensors on the bus as having addresses 01, 10, 12, 13, 14. The controller will then know to automatically assign the sensor with address 01 to address 11, automatically linking the newly installed sensor to the same pump that the replaced sensor was being used to monitor. If more than one sensor must be replaced, then the technician will need to replace one sensor, initiate the replace sensor process with the controller, and then select which of the 2 or more possible missing sensors have been replaced. This process would be repeated until all sensors are installed and re-addressed. Sensor addresses may be re-written in non-volatile memory when changed such that even when power has been removed from the device it will retain its unique address.
  • the sensor can perform self diagnostics and attempts to indicate faults to both the machine controller via Modbus and the user via, for example, an LED.
  • Self diagnostics may include but are not limited to an accelerometer element deflection, a check of parameters fetched from memory, bias voltage of the MCU and peripheral ICs.
  • the system/method can (i) trigger an operator alert via a machine interface (e.g., simple light or buzzer or more advanced message on a display screen) or (ii) may automatically send a message to a service entity (e.g., e-mail, text message, etc.).
  • a machine interface e.g., simple light or buzzer or more advanced message on a display screen
  • a service entity e.g., e-mail, text message, etc.
  • U.S. Patent No. 8,042,557 shows one example of a flow-through type warewasher in which the system and method could be used to monitor one or more of pumps 22, 44, 48, 64 or any other pump used in the machine.
  • U.S. Patent No. 7,892,359 shows one example of a batch-type warewasher in which the system and method could be used to monitor one or more of pumps 10, 30, 20, 66, 220 or any other pump used in the machine.

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  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Control Of Positive-Displacement Pumps (AREA)

Claims (15)

  1. Verfahren zur Überwachung einer Pumpe (1) in einer Geschirrspülmaschine, wobei die Pumpe (1) angeordnet ist, um eine oder mehrere Düsen zum Besprühen des Geschirrs mit Flüssigkeit zu versorgen, wobei das Verfahren umfasst:
    - Nutzung eines an der Maschine montierten Sensors zum Bestimmen von Pumpenschwingungen,
    dadurch gekennzeichnet, dass
    der Sensor ein dreiaxialer Sensor ist,
    wobei das Verfahren weiterhin umfasst:
    - Bestimmen einer Gesamtgrößenordnung von Schwingungen während des Pumpenbetriebs, um einen potenziellen Ausfall der Pumpe zu analysieren.
  2. Verfahren nach Anspruch 1, das das Bestimmen sowohl der Gesamtgrößenordnung als auch der Richtung von Schwingungen während des Pumpenbetriebs beinhaltet, um einen potenziellen Ausfall der Pumpe (1) zu analysieren.
  3. Verfahren nach Anspruch 1 oder 2, bei dem der Sensor nicht direkt an der Pumpe (1) montiert ist.
  4. Verfahren nach Anspruch 1 oder 2, bei dem der Sensor (i) entweder an einer Behälter- oder Sumpfwand, an der die Pumpe angebracht ist, oder (ii) an einer Platte (6), an der die Pumpe (1) angebracht ist, montiert ist, und
    wobei ein Satz Stiftschrauben (i) entweder an der Wand oder (ii) an der Platte (6) befestigt ist, und wobei der dreiaxiale Sensor an einer Leiterplatte innerhalb eines Kunststoffgehäuses (11) mit Montageöffnungen zum Durchführen der Stiftschrauben positioniert ist, um dadurch das Gehäuse (11) des Sensors an der Wand oder Platte (6) zu montieren.
  5. Verfahren nach Anspruch 1 zur Überwachung mehrerer Pumpen (1) in einer Geschirrspülmaschine, wobei jede Pumpe (1) dazu dient, eine Flüssigkeit innerhalb der Maschine zu bewegen, um das Geschirr in der Maschine mit Flüssigkeit zu besprühen, wobei das Verfahren umfasst:
    - Nutzung von einem oder mehreren Sensoren zum Bereitstellen eines Ausgangssignals oder von Ausgangssignalen zum Anzeigen des Schwingungsniveaus einer eden Pumpe (1) ;
    - für jede Pumpe (1):
    Analysieren des von der Pumpe (1) angezeigten Schwingungsniveaus nur dann, wenn die Pumpe als saubere/frische Flüssigkeit bewegend zu betrachten ist, um so Schwingungsveränderungen auszuschließen, die durch verschmutzte Flüssigkeit verursacht sein könnten, und/oder
    - für jede Pumpe (1):
    Analysieren des von der Pumpe (1) angezeigten Schwingungsniveaus nur dann, wenn diese Pumpe läuft und alle anderen Pumpen (1) nicht laufen, um so Schwingungsveränderungen auszuschließen, die durch den Betrieb der anderen Pumpen verursacht sein könnten, und/oder
    - für jede Pumpe (1):
    Analysieren des von der Pumpe (1) angezeigten Schwingungsniveaus nur nachdem die Pumpe mindestens für einen vorbestimmten Zeitraum gelaufen ist, um so Schwingungsveränderungen auszuschließen, die durch induktive Spitzen oder Kavitation verursacht sein könnten, die dazu tendieren, beim Anlaufen der Pumpe aufzutreten.
  6. Verfahren nach Anspruch 5, beinhaltend:
    Bestimmen des von jeder der Pumpen (1) angezeigten Schwingungsniveaus in aufeinander folgender Weise nach einem Maschinenabpump- und -wiederbefüllungsvorgang.
  7. Verfahren nach Anspruch 5, beinhaltend:
    Durchführen eines Überprüfungsvorgangs mit allen laufenden Pumpen (1), wobei die Schwingungsniveaudaten für jede der Pumpen bestimmt und analysiert werden.
  8. Verfahren nach Anspruch 1, umfassend:
    - Nutzung eines Sensors zum Bereitstellen eines Ausgangssignals zur Anzeige des Schwingungsniveaus der Pumpe (1);
    - Nutzung eines gespeicherten Basislinienschwingungsniveaus für die Pumpe (1), wobei die Basislinie während eines definierten Satzes von Maschinenbetriebsbedingungen bestimmt wurde; und
    - Vergleichen des im Wesentlichen von der Pumpe nachfolgend angezeigten Schwingungsniveaus nur während des definierten Satzes von Betriebsbedingungen mit dem Basislinienschwingungsniveau, um einen potenziellen Pumpenausfall zu bewerten,
    - wobei das gespeicherte Basislinienschwingungsniveau (i) während der Maschinenüberprüfung nach der Herstellung und vor der Maschineninstallation an einer Betriebsstätte oder (ii) nach einer spezifizierten Anzahl von Maschinenläufen oder Betriebszeiten an einer Betriebsstätte oder (iii) nach einem Pumpenaustausch an einer Betriebsstätte der Maschine bestimmt wird.
  9. Verfahren nach Anspruch 1 zur Überprüfung erster und zweiter Pumpen (1) in einer Geschirrspülmaschine, wobei jede Pumpe (1) dazu dient, eine Flüssigkeit innerhalb der Maschine zu bewegen, um das Geschirr in der Maschine mit der Flüssigkeit zu besprühen, wobei das Verfahren umfasst:
    - Bereitstellen eines Sensors zur Überprüfung des Schwingungsniveaus der ersten und zweiten Pumpen (1);
    - wenn die erste Pumpe (1) läuft und die zweite Pumpe (1) nicht läuft, Nutzung des einen Sensors, um die Schwingung der ersten Pumpe (1) zu bewerten; und
    - wenn die zweite Pumpe läuft und die erste Pumpe nicht läuft, Nutzung des einen Sensors, um die Schwingung der zweiten Pumpe (1) zu bewerten.
  10. Verfahren nach Anspruch 9, bei dem der eine Sensor an einer Stelle zwischen der ersten Pumpe (1) und der zweiten Pumpe (1) montiert ist, und/oder wobei die erste Pumpe und die zweite Pumpe an einer gemeinsamen Platte montiert sind, und wobei der eine Sensor ebenfalls an der gemeinsamen Platte montiert ist.
  11. Verfahren nach Anspruch 1,
    - Nutzung eines Sensors zum Bereitstellen eines Ausgangssignals zum Anzeigen des Schwingungsniveaus der Pumpe (1), wobei der Sensor einen eingestellten Schwingungserkennungsbereich hat;
    - bei Feststellung, dass das Sensorausgangssignal eine Schwingung anzeigt, die einem oder mehreren spezifischen Kriterien entspricht, automatisches Ändern des Schwingungserkennungsbereichs des Sensors.
  12. Verfahren nach Anspruch 11, beinhaltend:
    - bei Feststellung, dass das Sensorausgangssignal eine Schwingung anzeigt, die hohe Schwingungskriterien im Verhältnis zum eingestellten Erkennungsbereich erfüllt, automatische Erhöhung des Schwingungserkennungsbereichs des Sensors, oder
    - bei Feststellung, dass das Sensorausgangssignal eine Schwingung anzeigt, die niedrige Schwingungskriterien im Verhältnis zum eingestellten Erkennungsbereich erfüllt, automatische Verringerung des Schwingungserkennungsbereichs des Sensors.
  13. Verfahren nach Anspruch 1,
    - Nutzung einer Sensoranordnung, die einen Schwingungssensor, einen Mikrokontroller und einen peripheren Speicher, montiert auf einer Platte, innerhalb des Gehäuses beinhaltet;
    - Speichern von Schwingungsdaten auf dem peripheren Speicherchip ohne festen Standort für zuletzt gespeicherte Daten.
  14. Verfahren nach Anspruch 13, beinhaltend:
    - Speichern von Sensorkalibrierungs- und - konfigurationsdaten innerhalb des Speichers des Mikrokontrollers, so dass beim Anlaufen und bei der Initialisierung des Sensors keine Kommunikation mit dem peripheren Speicherchip erforderlich ist.
  15. Verfahren nach Anspruch 1 zur Überwachung mehrerer Pumpen in einer Geschirrspülmaschine, wobei jede der Pumpen (1) vorgesehen ist, um eine oder mehrere Düsen zum Besprühen des Geschirrs mit Flüssigkeit zu versorgen, wobei das Verfahren umfasst:
    - Nutzung mehrerer ähnlicher Sensoren, wobei jeder Sensor mit einer gemeinsamen Default-Busadresse initialisiert ist;
    - während der Maschinenherstellung für jeden Sensor auf einem Kommunikationsbus der Maschine, Umändern der Default-Busadresse in eine einzigartige Busadresse;
    - bei nachfolgendem Sensoraustausch in der Maschine, Bewerten der Busadressen von mit dem Bus verbundenen Sensoren, um eine fehlende einzigartige Busadresse des entfernten Sensors und eine vorliegende Default-Busadresse des Austauschsensors zu identifizieren, sowie automatisches Ändern der Default-Busadresse des Austauschsensors in die fehlende einzigartige Busadresse.
EP13192913.5A 2012-11-20 2013-11-14 System zur erkennung von motorausfällen bei geschirrspülmaschinenpumpen, sowie zugehöriges verfahren Active EP2732748B1 (de)

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US20210341896A1 (en) * 2020-05-01 2021-11-04 Rockwell Automation Technologies Inc. Industrial motor drives with integrated condition monitoring

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Publication number Priority date Publication date Assignee Title
DE3725754A1 (de) * 1987-08-04 1989-02-16 Busch Dieter & Co Prueftech Einrichtung zum ueberwachen von pumpen auf gefaehrdung durch kavitation
US4913625A (en) * 1987-12-18 1990-04-03 Westinghouse Electric Corp. Automatic pump protection system
DE19618498A1 (de) * 1996-05-08 1997-11-13 Amp Gmbh Anordnung zur Überwachung einer Pumpe
DE19828871B4 (de) * 1998-06-25 2008-07-03 BSH Bosch und Siemens Hausgeräte GmbH Geschirrspülmaschine
DE10065677A1 (de) * 2000-12-29 2002-07-04 Bsh Bosch Siemens Hausgeraete Wasserführendes Haushaltgerät mit optimierter Pumpensteuerung
DE102005015157A1 (de) 2005-04-02 2006-10-05 Premark Feg L.L.C., Wilmington Mehrtank-Transportspülmaschine und ein Betriebsverfahren hierfür
KR20090022855A (ko) * 2007-08-31 2009-03-04 엘지전자 주식회사 식기세척기
DE102007062953A1 (de) 2007-12-21 2009-06-25 Premark Feg L.L.C., Wilmington Geschirrspülmaschine in Form eines Programmautomaten und Verfahren zu deren Betrieb

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