Procedure for data diagnosis of an engine

Abstract

The invention relates to a method for data diagnosis of a motor (2) in a power supply network (4), - detecting, by a detection device (8) of an engine management system, instantaneous values of current and / or voltage in a motor branch (6) of the power supply network (4) leading to the motor (2); - Calculating, by a processor (10) of the detection device (8), effective values from the detected instantaneous values; - transmitting, via a first data interface (12), the calculated effective values from the detection device (8) to a control device (14) of the engine management system, which executes protection and control functions of the engine management system on the basis of the obtained effective values; - storing the recorded instantaneous values in a data memory (16) of the recording device (8); - transmitting, via the first data interface (12), the stored instantaneous values from the recording device to the control device (14); - transmitting the instantaneous values from the control device (14) to an analysis device (18); and - analyzing the instantaneous values by the analysis device (18) in order to detect patterns in the instantaneous values which allow a statement to be made about an operating state of the engine (2).

Description

[0001] The present invention relates to a method for data diagnosis of an engine, an engine management system and a data diagnosis system for monitoring an engine.

[0002] Data diagnostic methods can be used to make predictions about the current and / or future condition of an electric motor based on a comprehensive database of measured values, such as time series of current and / or voltage. Data diagnostic methods are becoming increasingly important, among other things, in the context of predictive maintenance (PDM), which enables increased plant availability.

[0003] A well-known data diagnostic method is motor current signature analysis (MCSA). Electric motors, as well as machines driven by them, especially rotating machines such as pumps, agitators, compressors, and fans, can assume different states during operation, which can be identified based on the temporal progression of motor current and / or motor voltage and / or motor effective power. Examples of such states include: for motors: broken rotor bars, short circuits in the stator windings, misalignment, and bearing damage; for pumps: dry running, cavitation, and misalignment; and for agitators: the condition of the agitator shaft or agitator element, and the viscosity of the material being agitated.

[0004] A prerequisite for these data diagnostic procedures is that recordings of measured variables, such as motor current, are available that are suitable for these procedures in terms of duration and sampling frequency. Currently, recording is performed either by installing a temporary measuring device, such as a storage oscilloscope, or by installing a separate, additional, permanently installed data acquisition device in the relevant motor feeder.

[0005] The installation of a temporary measuring arrangement on a motor feeder during operation always causes problems, whether it is risks for the operation of the system itself (short circuit) or for people, since it is not permitted to carry out work while electrical voltage is applied.

[0006] Installing a separate, additional, permanently installed data acquisition device in the relevant engine feeder requires additional investment and installation space. Currently, separate data acquisition devices are offered that serve only the MCSA purpose and must be integrated into an engine feeder in addition to devices that serve engine management.

[0007] DE 10 2004 030 076 A1 (Bosch Rexroth AG) 09.02.2006 describes a method for data diagnostics of a motor in a power supply network.

[0008] US 6 646 397 B1 (Discenzo; Rockwell Automation Technologies, Inc.) November 11, 2003 describes a common measurement data acquisition for the motor control and for the diagnostic module.

[0009] US 2008 / 0 315 811 A1 (Hudson et al.; Virginia Tech Intellectual Properties, Inc.) December 25, 2008 describes a common measurement data acquisition for the engine control 108 and for a computer 112 for data evaluation.

[0010] US 2006 / 0 196 265 A1 (Dimino et al.; Eaton) 07.09.2006 describes a monitoring device with protective functions and also with predictive maintenance functions.

[0011] The object of the present invention is to provide an improved possibility for data diagnosis of an engine.

[0012] This object is achieved according to the invention by a method having the features specified in claim 1. The method is used for data diagnosis of a motor in a power supply network. The method comprises the following steps: detecting, by a detecting device of a motor management system, instantaneous values of current and / or voltage in a motor branch of the power supply network leading to the motor. A further step is the calculation, by a processor of the detecting device, of effective values from the detected instantaneous values. A further step is the transmission, via a first data interface, of the calculated effective values from the detecting device to a control device of the motor management system, which control device executes protection and control functions of the motor management system on the basis of the obtained effective values. A further step is the storage of the detected instantaneous values in a data memory of the detecting device.Once the storage process is complete, the acquisition device can send information to the control unit, indicating that a new data set is ready. A next step is to transfer the stored instantaneous values from the acquisition device to the control unit via the first data interface. A further step is to transfer the instantaneous values from the control unit to an analysis device. A further step is to have the analysis device analyze the instantaneous values to detect patterns in the instantaneous values that allow a statement to be made about the operating state of the engine.

[0013] This object is achieved according to the invention by a motor management system having the features specified in claim 10. The motor management system is configured to provide protection and control functions for a motor in a power supply network. The motor management system has the following system components: A detection device configured to detect instantaneous values of current and / or voltage in a motor branch of the power supply network leading to the motor. A processor of the detection device configured to calculate effective values from the detected instantaneous values. A control device configured to execute the protection and control functions of the motor management system based on the obtained effective values. A first data interface configured to transmit the calculated effective values from the detection device to the control device.A data memory of the acquisition device configured to store the acquired instantaneous values, wherein the first data interface is further configured to transmit the stored instantaneous values from the acquisition device to the control device.

[0014] The engine management system devices are thus enabled to perform data acquisition of instantaneous values suitable for data diagnostics. For this purpose, the acquisition device has a data memory, and the firmware of the acquisition device and control unit is adapted accordingly, allowing data acquisition and transmission of the acquired instantaneous values to the analysis device. If data diagnostics are required, data acquisition and transmission of the acquired instantaneous values to the analysis device can be activated.

[0015] This object is achieved according to the invention by a data diagnostic system having the features specified in claim 11. The data diagnostic system serves for data diagnostics of a motor in a power supply network. The data diagnostic system has the following system components: A motor management system as described above. An analysis device configured to analyze instantaneous values in order to detect patterns in the instantaneous values that allow a statement to be made about an operating state of a motor. A second data interface configured to transmit the instantaneous values from the control device to the analysis device.

[0016] A motor management system protects a motor feeder through a combination of various multi-stage and delay-dependent protection and monitoring functions. By monitoring electrical variables, exceedances of warning limits can be used for the early detection of irregularities in operating behavior. Typical functions of a motor management system include: current-dependent electronic overload protection, thermistor motor protection, phase failure / unbalance protection, stall protection, monitoring of adjustable limits for the motor current, voltage and power monitoring, cos φ monitoring (motor idle / load shedding), ground fault monitoring, temperature monitoring (e.g., via Pt100 / Pt1000), monitoring of operating hours, downtime, and number of starts.

[0017] Siemens AG's proprietary motor management system is called SIMOCODE pro (SIMOCODE = SIRIUS Motor Management and Control Device). It provides a wide range of operating, service, and diagnostic data, helping to detect impending faults at an early stage and prevent them through preventative measures. In the event of a fault, a fault can be diagnosed, located, and eliminated within a very short time – system downtimes are eliminated or reduced to a minimum. The operating data provided includes the motor switching state, derived from the current flow in the main circuit, all phase currents, all phase voltages and line-to-line voltages, active power, apparent power, and power factor, phase asymmetry and phase sequence, ground fault current, frequency, time to trip, motor temperature, and remaining cooling time.The service data provided includes motor operating hours, motor downtimes, number of motor starts, number of overload trips, interval for mandatory testing of the enabling circuits, energy consumed, and internal comments stored in the device. Diagnostic data provided includes numerous detailed early warning and fault messages, internal device error logging with time stamp, and time stamping of freely selectable status, warning, or fault messages. SIMOCODE pro is described in the SIMOCODE pro System Manual "Industrial Controls, Motor Management and Control Devices, SIMOCODE pro", Edition 02 / 2023, A5E40507475001A / RS-AG / 007, published by Siemens AG, Smart Infrastructure, Electrical Products, P.O. Box 10 09 53, 93009 Regensburg, Germany, as of March 2023.

[0018] SIMOCODE pro, installed in a motor control center or low-voltage switchgear, is the intelligent connection between the higher-level automation system and the motor feeder. It combines: Multifunctional, electronic full motor protection, independent of the automation system; Integrated control functions instead of hardware for motor control; Detailed operating data, service data, and diagnostic data; Fail-safe shutdown up to SIL3; Open communication via PROFINET, Modbus TCP, and EtherNet / IP; Parameterization with the SIMOCODE ES software package (TIA Portal). In addition, only the switching and short-circuit protection devices of the main circuit (contactors, circuit breakers, fuses) are required.

[0019] The invention is based on the idea that motor management devices installed in a motor feeder are upgraded to perform data acquisition in addition to the motor management functions, in particular overload protection, to such an extent that the acquired measured values are suitable for data diagnostics of a motor, e.g., condition monitoring, MCSA, etc. In this way, the installation of a separate, additional, permanently installed data acquisition device in the relevant motor feeder is unnecessary: the necessary investment is significantly reduced, and no additional installation space is required.

[0020] The key difference from the state of the art is that the hardware and firmware required for acquiring, storing, and transmitting the recorded measured values are integrated into devices that are already required or used for the protection and control of a motor feeder. Essential components such as current and / or voltage sensing, as well as digital processing and transmission, are already part of a motor protection system, e.g., the proprietary SIMOCODE pro motor management system from Siemens AG, and are enhanced with suitable storage and transmission functions according to the invention.

[0021] A recording device and a control device therefore provide functions both for engine management of the engine, based on effective values, and for data diagnosis of the engine, based on an analysis of instantaneous values.

[0022] The basis for data diagnostics is the recorded measured values of current and voltage from the relevant motor feeders. Whether only the current or also the voltage is required depends on the evaluation method to be used. Recording the instantaneous current values is sufficient, for example, for MCSA with a sampling frequency of 3.2 / 4.2 kHz (at a 50 / 60 Hz mains frequency). However, it is possible that the temporal variation of the active power is also of interest, which then requires voltage values in addition to current values.

[0023] Advantageous embodiments and further developments of the invention are specified in the dependent claims. The method according to the invention can also be further developed according to the dependent device claims, and vice versa.

[0024] According to a preferred embodiment, the analysis is performed using MCSA. For MCSA, the minimum duration of a sampling sequence is approximately 5 seconds; with the present invention, sampling sequences of instantaneous values can be acquired whose length far exceeds this minimum length.

[0025] According to a preferred embodiment, the storage of the acquired instantaneous values in the data memory and the transmission of the stored instantaneous values from the acquisition device to the control device takes place asynchronously. The sequence can be as follows: A sampling sequence, in which instantaneous values acquired by the acquisition device are stored in the data memory of the acquisition module, is started by a trigger event. The acquired instantaneous values are stored in the data memory of the acquisition device. The storage of the acquired instantaneous values in the data memory of the acquisition module is terminated as soon as the data memory of the acquisition device is full. The instantaneous values stored in the data memory are then transferred to the control device in blocks, e.g., 200 kB blocks, until the entire memory contents of the data memory have been transferred. Only then is it possible to start the next sampling sequence.

[0026] According to a preferred embodiment, the point in time at which the storage of the acquired instantaneous values in a data memory, i.e., a sampling sequence, begins, is triggered by an external command or by an engine condition. An external command can be sent from a control center or a control unit. It is also possible that the analysis device determines during data diagnosis that it requires further measured values for a specific engine condition in order to confirm a pattern in the data. In this case, the analysis device can send a corresponding notification to the control device, and the control device can cause the acquisition device to start a sampling sequence at the desired point in time. A trigger event can also be defined by an engine condition, e.g., at the beginning of an engine start-up, 10 seconds after engine start-up, once per hour, etc.

[0027] According to a preferred embodiment, the storage of the acquired instantaneous values in the data memory, i.e., a sampling sequence, only begins when the data memory is empty. This ensures that a maximum amount of data memory is available for the instantaneous values of the sampling sequence.

[0028] According to a preferred embodiment, the data memory is an EEPROM with 1 to 10 megabytes. The advantage is that the investment costs for a data memory of this size are relatively low.

[0029] According to a preferred embodiment, the calculated effective values and the stored instantaneous values are transmitted via the first data interface using an electrical RS485 connection. The advantage of this is that this standard is widely used and there is considerable experience with it.

[0030] According to a preferred embodiment, the stored instantaneous values are transmitted in blocks via the first data interface. The advantage of this is that by specifying the block size, the transmission capacity of the first data interface can be optimally utilized.

[0031] According to a preferred embodiment, the instantaneous values are transmitted from the control unit to the analysis device via a cable connection via a second data interface in the form of an Ethernet interface of the control unit according to the OPC UA standard. The advantage of this is that this standard is very widespread and there is considerable experience with it.

[0032] According to a preferred embodiment, the analysis device is an edge device, or the analysis device is provided in a cloud infrastructure.

[0033] The above-described properties, features, and advantages of this invention, as well as the manner in which they are achieved, will become clearer and more readily understood from the following description of the embodiments, which are explained in more detail with reference to the drawings. The drawings are schematic and not to scale: Fig. 1 a well-known engine management system; Fig. 2 a data diagnostic system; and Fig. 3 a flowchart of the method for monitoring a motor in a power supply network.

[0034] Fig. 1 describes a known motor management system. A three-phase power supply network 4, e.g., a three-phase network, has a main circuit 1 with three phase conductors L1, L2, L3. A three-phase motor branch 6 branches off from the main circuit 1 at connection points 3 of the main circuit 30, via which electrical energy is transported to an electric motor 2. The motor can be a low-voltage three-phase asynchronous motor or any other electrically operated motor.

[0035] Viewed in the direction of energy transport from the connection points 3 to the motor 2, a switch 24 and a detection device 8 are connected in series in the motor feeder 6. The switch 24 switches all three phase conductors L1, L2, L3 of the motor feeder 6. The switch 24 can be designed as a mechanically or electronically switching switch, e.g., as a contactor or as a power semiconductor switch. The switch 24 can be a circuit breaker, e.g., an MCCB (= Molded Case Circuit Breaker), which interrupts the current in the motor feeder 6 in the event of a fault, e.g., a short circuit or overload, to prevent damage.

[0036] The acquisition device 8 is used to acquire current and / or voltage values in the phase conductors L1, L2, L3 of the motor feeder 6. The voltages of the phase conductors L1, L2, L3 can be measured against each other, against a neutral conductor, or against another defined potential, e.g., against ground potential. The acquisition device 8 has a processor 10 that converts measured instantaneous values of current and / or voltage into effective values. The effective values are sent from the acquisition device 8 to a control device 14 via a first data interface 12. For example, this transmission of the effective values can be based on SPI (Serial Peripheral Interface), e.g., one data block every 30 ms. As soon as enough effective values have been calculated for a block to be transmitted, they are transmitted; therefore, no buffer memory is required in the acquisition device 8.

[0037] The control unit 14 has a processor 26 that evaluates the effective values. If an evaluation of the effective values performed by the control unit 14 indicates a fault or other undesirable condition of the power supply network 4, the control unit 14 sends a control signal to the switch 24 via a control line 28. If triggered by a received control signal, the switch 24 interrupts the current through the phase conductors L1, L2, L3 of the motor feeder 6 to protect the motor 2 from damage.

[0038] The detection device 8 and the control device 14 are components of a motor management system which performs protection and control functions for the motor 2 based on the effective values of current and / or voltage.

[0039] Fig. 2 describes a data diagnostic system for the data diagnosis of an engine 2. The Fig. The description of the three-phase power supply network 4 given in Figure 1, in which a motor management system is installed, which has a detection device 8 and a control device 14 for providing protection and control functions for the motor 2, applies here in the same way, since in the data diagnostic system of Fig. 2 the engine management system as it is in Fig. 1 is also installed and performing its functions. Therefore, for the description of Fig. 2 towards the Fig. 1 given description.

[0040] In addition to the components and functions included in Fig. 1, the data diagnostic system has additional components and functions, which are described below.

[0041] The recording device 8 of the engine management system, which is configured to record instantaneous values of current and / or voltage in the motor branch 6 of the power supply network 4 leading to the motor 2, has not only a processor 10 but also a data memory 16.

[0042] The control unit 14 of the engine management system, which executes protection and control functions of the engine management system based on the obtained effective values, is connected not only to a switch 24 of the engine branch 6 via a control line 28, but also to an analysis device 18 via a second data interface 20. The analysis device 18 can be an edge device and / or be provided in a cloud infrastructure 22.

[0043] Just like the engine management system, which is Fig. 1, the data diagnostic system also provides functions of an engine management system, i.e., instantaneous values of current and / or voltage in the motor branch 6 are recorded by the recording device 8, effective values are calculated from the recorded instantaneous values by a processor 10 of the recording device 8, and the calculated effective values are transmitted via the first data interface 12 from the recording device 8 to the control device 14, which executes protection and control functions of the engine management system based on the obtained effective values. In addition, the recorded instantaneous values are also stored in the data memory 16 of the recording device 8, transmitted via the first data interface 12 from the recording device to the control device 14, and from the control device 14 to an analysis device 18.In the analysis device 18, the instantaneous values are analyzed in order to detect patterns in the instantaneous values that allow a statement to be made about an operating state of the engine, i.e. a process is carried out which is referred to as data diagnosis.

[0044] If the data analysis by the analysis device 18 determines that the motor has a problem, the analysis device 18 can send a signal to the control device 14, which triggers the control device 14 to send a control signal to the switch 24 via a control line 28. If triggered by a received control signal, the switch 24 interrupts the current through the phase conductors L1, L2, L3 of the motor branch 6. Once the motor 2 has come to a standstill due to the lack of power, it can be serviced to eliminate the detected problem.

[0045] The following are exemplary embodiments for recording instantaneous values. These examples are intended solely to provide a better understanding of the concept to those skilled in the art. The examples are not to be interpreted as limiting in any way; any other suitable implementation is equally possible.

[0046] According to a first example, instantaneous values of current and / or voltage are recorded at a sampling frequency of 3.2 kHz (at a 50 Hz mains frequency) or at a sampling frequency of 4.2 kHz (at a 60 Hz mains frequency). A sampling frequency of 3.2 kHz (4.2 kHz) means 3200 (4200) sampling operations per second. At a 50 Hz mains frequency, this means 3200 / 50 = 64 sampling operations per mains period, and at a 60 Hz mains frequency, this means 4200 / 60 = 70 sampling operations per mains period.

[0047] According to a second example, instantaneous values of current and / or voltage are recorded at a sampling frequency of 3.2 kHz (at a 50 Hz mains frequency) or at a sampling frequency of 3.84 kHz (at a 60 Hz mains frequency). A sampling frequency of 3.2 kHz (3.84 kHz) means 3200 (3840) sampling operations per second. At a 50 Hz mains frequency, this means 3200 / 50 = 64 sampling operations per mains period, and at a 60 Hz mains frequency, this means 3840 / 60 = 64 sampling operations per mains period. In this second example, 64 sampling operations per mains period occur at both a 50 Hz mains frequency and a 60 Hz mains frequency.

[0048] These sampling frequencies are suitable both for use of the measured values in the engine management system, embodied by the acquisition device 8 and the control device 14, and for use of the measured values in the data diagnostic system, embodied by the acquisition device 8, the control device 14 and the analysis device 18. The acquisition device 8 and the control device 14 thus provide functions both for the engine management system, based on effective values, and for the data diagnostic system, based on instantaneous values.

[0049] The data memory 16 of the acquisition device 8 can have a storage capacity in the single-digit MB range, e.g., 1 to 9 MB. The transmission of the instantaneous values from the acquisition device 8 to the control device 14 can be RS584-based, e.g., at 1.5 Mbit / sec. The transmission of the instantaneous values from the acquisition device 8 to the control device 14 can occur in parallel and synchronously with the transmission of the effective values from the acquisition device 8 to the control device 14. The transmission of the instantaneous values from the control device 14 to the analysis device 18 can occur via Ethernet using OPC UA.

[0050] Fig. 3 shows a flowchart of the method for monitoring a motor 2 in a power supply network 4. In a first step 31, a detection device 8 of a motor management system detects instantaneous values of current and / or voltage in a motor branch 6 of the power supply network 4 leading to the motor 2.

[0051] The following example estimate can be made: For example, a sample value has a data size of 4 bytes. If, in a three-phase network with three phase conductors (L1, L2, L3), current values I and voltage values U are recorded in each phase conductor per recording process (sampling), the resulting data volume per recording process is 2 [2 samples: I and U] x 3 [3 phase conductors] x 4 bytes [data size of one sample value] = 24 bytes. With a sampling frequency of 3.2 kHz, this means a data volume of 24 bytes x 3.2 kHz = 76.8 kByte / s.

[0052] In a second step 32, a processor 10 of the acquisition device 8 calculates effective values from the acquired instantaneous values. In a third step 33, the calculated effective values are transmitted via a first data interface 12 from the acquisition device 8 to a control device 14 of the engine management system, which executes protection and control functions of the engine management system based on the obtained effective values. In a fourth step 34, the acquired instantaneous values are stored in a data memory 16 of the acquisition device 8.

[0053] The following exemplary estimate can be made: For example, data memory 16 has a data storage capacity of 5 MB. Since a data volume of 76.8 kByte of instantaneous values is acquired per second, a sampling sequence with a duration of 5 MBs / 0.0768 MB = 65 s can be stored in data memory 16.

[0054] In a fifth step 35, the stored instantaneous values are transmitted from the recording device to the control device 14 via the first data interface 12.

[0055] The following estimate can be made: For example, the data transmission is based on the RS485 protocol with a transmission speed of 1.5 Mbit / s = 0.1875 MB / s. Thus, the transmission of the entire 5 MB data storage takes approximately 5 MB s / 0.1875 MB = 26.7 s.

[0056] In a sixth step 36, the instantaneous values are transmitted from the control device 14 to an analysis device 18.

[0057] In a seventh step 37, the instantaneous values are analyzed by the analysis device 18 in order to detect patterns in the instantaneous values that allow a statement to be made about an operating state of the engine 2.

[0058] Since the engine management and instantaneous value analysis functions are performed in parallel, the above steps do not necessarily follow a chronological sequence. The first step 31 is the basis for both functions, i.e., engine management and instantaneous value analysis. However, the second and third steps 32 and 33, which relate to the engine management functions, can be performed in parallel with the fourth to seventh steps 34 to 37, which relate to instantaneous value analysis. List of reference symbols 1 main circuit 2 engines 3 connection point 4 Power supply network 6 Motor branch 8 Recording device 10 processor out of 8 12 first data interface 14 Control device 16 data storage 18 Analysis device 20 second data interface 22 Cloud infrastructure 24 switches 26 processor out of 14 28 Control line 31 first step 32 second step 33 third step 34 fourth step 35 fifth step L1 phase conductor, first L2 phase conductor, second L3 Phase conductor, third

Claims

[1] Method for data diagnosis of a motor (2) in a power supply network (4), - detecting, by a detection device (8) of an engine management system, instantaneous values of current and / or voltage in a motor branch (6) of the power supply network (4) leading to the motor (2); - Calculating, by a processor (10) of the detection device (8), effective values from the detected instantaneous values; - transmitting, via a first data interface (12), the calculated effective values from the detection device (8) to a control device (14) of the engine management system, which executes protection and control functions of the engine management system on the basis of the obtained effective values; - storing the recorded instantaneous values in a data memory (16) of the recording device (8); - transmitting, via the first data interface (12), the stored instantaneous values from the recording device to the control device (14); - transmitting the instantaneous values from the control device (14) to an analysis device (18); and - analyzing the instantaneous values by the analysis device (18) in order to detect patterns in the instantaneous values which allow a statement to be made about an operating state of the engine (2). [2] The method of claim 1, wherein the analyzing is performed by MCSA. [3] Method according to one of the preceding claims, wherein the storing of the detected instantaneous values in the data memory (16) and the transmission of the stored instantaneous values from the detection device (8) to the control device (14) takes place asynchronously. [4] Method according to one of the preceding claims, wherein a time at which the storage of the detected instantaneous values in a data memory (16) begins is triggered by an external command or by an engine state. [5] Method according to one of the preceding claims, wherein the storage of the detected instantaneous values in the data memory (16) only begins when the data memory (16) is empty. [6] Method according to one of the preceding claims, wherein the data memory (16) is an EEPROM with 1 to 10 megabytes. [7] Method according to one of the preceding claims, wherein the transmission of the calculated effective values and the stored instantaneous values via the first data interface (12) takes place via an electrical RS485 connection. [8] Method according to one of the preceding claims, wherein the stored instantaneous values are transmitted in blocks via the first data interface (12). [9] Method according to one of the preceding claims, wherein the transmission of the instantaneous values from the control device (14) to the analysis device (18) is carried out by cable via a second data interface (20) in the form of an Ethernet interface of the control device (14) according to the OPC UA standard. [10] Motor management system configured to provide protection and control functions for a motor (2) in a power supply network (4), comprising - a detection device (8) configured to detect instantaneous values of current and / or voltage in a motor branch (6) of the power supply network (4) leading to the motor (2); - a processor (10) of the acquisition device configured to calculate effective values from the acquired instantaneous values; - a control device (14) configured to execute the protection and control functions of the engine management system on the basis of obtained effective values; - a first data interface (12) configured to transmit the calculated effective values from the detection device to the control device (14); - a data memory (16) of the detection device (8) which is configured to store the detected instantaneous values, wherein the first data interface (12) is also configured to transmit the stored instantaneous values from the detection device (8) to the control device (14). [11] Data diagnostic system for monitoring a motor (2) in a power supply network (4), comprising - an engine management system according to claim 10, - an analysis device (18) configured to analyze instantaneous values in order to detect patterns in the instantaneous values that allow a statement to be made about an operating state of an engine (2); - a second data interface (20) configured to transmit the instantaneous values from the control device (14) to the analysis device (18). [12] Data diagnostic system according to claim 11, wherein the analysis device (18) is an edge device or is provided in a cloud infrastructure (22).

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