EPE Association: EPE 1991 - 39 - Session 4.6: FAULT DETECTION AND DIAGNOSTIC

EPE 1991 - 39 - Session 4.6: FAULT DETECTION AND DIAGNOSTIC
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   INFLUENCE OF THE SWITCHING MODE ON CONDUCTED AND RADIATED PERTURBATIONS
By F. Costa; F. Forest; A. Puzo; G. Rojat [View]
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Abstract: Over the last few years, the studies on E.M.C. (electromagnetic compatibility) have undergone a huge development. The three elements essential to the study of electromagnetic interferences are as follows: the sources, the means of propagation and the victims. The sources can be either natural or artificial. Their coupling with victims are made either by conduction or radiation. The study we present in this article consists in investigating the conducted and radiated perturbations which are created by the three main modes of switching. Hence, we have developed three non-isolated converters 100V-1kW representing each of these modes. It was first necessary to define accurately the condition and environment of measurement. We thus have been able to underscore the main parameters contributing to generate perturbations. The phenomena have been numerically simulated. This study ought to enable us to define the elements which are to be taken into account during the designing of a converter, so as to integrate initially the problems of electromagnetic compatibility into it.

   REMEDIAL STRATEGIES FOR INVERTER - A.C. MOTOR SYSTEM AT THE OCURRENCE OF A TRANSISTOR DRIVE FAULT
By T. Elch-Heb; J. P. Hautier [View]
[Download]

Abstract: This paper concerns the reliability of motion system using the inverter - a.c. motor association. The problem is as fellows:
- To assure the continuity of the application at the ocurrence of a transistor drive fault,
- To respect the technical and economic limits.
In the proposed example, the authors describe a remedial working mode of the inverter at the appearence of transistor drive fault (power transistor remains swiched off). The solution consists in not driving the "detective leg" and in continuing the application in a single phase working mode. The electrical and mechanical behaviour will be affected but remains acceptable. However it's suitable to provide a variable topology speed control structure, which will be adapted to the working mode. Some experimental results validate the modelling of power part - near control.

   MODERN DIAGNOSTICS SUPPORT FOR INDUSTRIAL DRIVE SYSTEMS
By Branko Premzel; Karel Jezernik [View]
[Download]

Abstract: Microprocessor based drive systems are gaining popularity not only because of their performance but also because of their diagnostics features which are able to shorten drive installation and repair time. Some additional diagnostics support integrated into the drive controller and the supporting software running on the host microcomputer, not found in most of the present implementations, is presented here. The user has access to all internal variables, statuses and I/O ports which can be presented numerically or graphically. Some fault processing, fault message storage and display methods are also shown. The purpose of this article is not to show a complete rescue, but to present some ideas and implementation details.

   AUTOMATIC DIAGNOSTICS OF H.V. HIGH-POWER THYRISTOR CONVERTERS
By A. Pawlaczyk [View]
[Download]

Abstract: It is difficult to explain the causes of failures of high-power converters in service. One of the possible solutions of this problem is to determine the state of thyristors and diodes of the converter before switching on the supply voltage and then, to supervise them with an automatic localisation of failures and to determine their causes and the circumstances of their appearance. The principle of the automatic determination of the causes of failures as well as the design and operation of the diagnostic equipment are considered.

   USE OF SIMULATION IN FAILURE DETECTION AND DIAGNOSIS OF AN ELECTROMECHANICAL SYSTEM
By O. Normand; S. Catellani; G. Champenois [View]
[Download]

Abstract: Digital simulation can be efficiently used for defect detection and diagnosis in an electromechanical system. Here, the goal is to detect faults in the behaviour of a four quadrants chopper supplying a DC motor. A reference model is built as close to the real system as possible. Both reference model and average corresponding model are simulated simultaneously. The diagnosis will be based on the difference between the results of the two models. Thanks to the use of an adaptable integration step in the simulation, the accuracy of the reference model will be improved as well as the calculation time.

   DYNAMIC BEHAVIOUR OF DIGITAL PHASE-LOCKED LOOPS IN A COMMUNICATION SYSTEM FOR DRIVES
By B. Gick [View]
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Abstract: The clock recovery in the Serial Real Time Communication System for Drives (SERCOS interface) is investigated. In order to regenerate the receiver clock and the incoming stream of data, all digital phase-locked loops (ADPLLs) are used. The dynamic behaviour of a chain of ADPLLs is analysed, the theoretical considerations are verified by measurements at an experimental ring. As a result, the constraints for mixing different kinds of ADPLLs in a ring are shown.

   DIAGNOSTIC INDEXES FOR KNOWLEDGE BASE REPRESENTATION OF INDUCTION MACHINE STATOR SHORT-CIRCUITS
By G. Franceschini; C. Tassoni; F. Filipetti; M. Martelli; G. Gentile; N. Rotondale [View]
[Download]

Abstract: The diagnosis of stator short circuits of induction machines are considered, with the aim to pointed out diagnostic indexes to be inserted in the knowledge base representation of machine faults. To remove the assumption of uniform temperature, an arcing resistance of the short circuit is introduced and suitable variables are looking for pointing out the short circuit parameters. It is so possible to overcome the discrepancies between the theoretical results, obtained with the usual machine model, and the experimental results. The diagnostic features of the procedure proposed are presented and discussed.

   SIMULATION AND REALISATION OF AN INDUCTION MOTOR SERVO CONTROLLED BY A SINGLE-PULSE CYCLOCONVERTER
By S. Lloyd; Z. Baykan; S. Saleh-Ud-Din [View]
[Download]

Abstract: The paper describes the modelling, simulation and realisation of an induction motor servo controlled by a single-pulse cycloconverter. The motor shaft positioning dynamics are investigated by means of a computer simulation and the results compared with those obtained from a practical servo.

EPE 1991 - 39 - Session 4.6: FAULT DETECTION AND DIAGNOSTIC
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1991 - Conference > EPE 1991 - 39 - Session 4.6: FAULT DETECTION AND DIAGNOSTIC
	[return to parent folder]

	INFLUENCE OF THE SWITCHING MODE ON CONDUCTED AND RADIATED PERTURBATIONS By F. Costa; F. Forest; A. Puzo; G. Rojat	[View] [Download]
Abstract: Over the last few years, the studies on E.M.C. (electromagnetic compatibility) have undergone a huge development. The three elements essential to the study of electromagnetic interferences are as follows: the sources, the means of propagation and the victims. The sources can be either natural or artificial. Their coupling with victims are made either by conduction or radiation. The study we present in this article consists in investigating the conducted and radiated perturbations which are created by the three main modes of switching. Hence, we have developed three non-isolated converters 100V-1kW representing each of these modes. It was first necessary to define accurately the condition and environment of measurement. We thus have been able to underscore the main parameters contributing to generate perturbations. The phenomena have been numerically simulated. This study ought to enable us to define the elements which are to be taken into account during the designing of a converter, so as to integrate initially the problems of electromagnetic compatibility into it.

	REMEDIAL STRATEGIES FOR INVERTER - A.C. MOTOR SYSTEM AT THE OCURRENCE OF A TRANSISTOR DRIVE FAULT By T. Elch-Heb; J. P. Hautier	[View] [Download]
Abstract: This paper concerns the reliability of motion system using the inverter - a.c. motor association. The problem is as fellows: - To assure the continuity of the application at the ocurrence of a transistor drive fault, - To respect the technical and economic limits. In the proposed example, the authors describe a remedial working mode of the inverter at the appearence of transistor drive fault (power transistor remains swiched off). The solution consists in not driving the "detective leg" and in continuing the application in a single phase working mode. The electrical and mechanical behaviour will be affected but remains acceptable. However it's suitable to provide a variable topology speed control structure, which will be adapted to the working mode. Some experimental results validate the modelling of power part - near control.

	MODERN DIAGNOSTICS SUPPORT FOR INDUSTRIAL DRIVE SYSTEMS By Branko Premzel; Karel Jezernik	[View] [Download]
Abstract: Microprocessor based drive systems are gaining popularity not only because of their performance but also because of their diagnostics features which are able to shorten drive installation and repair time. Some additional diagnostics support integrated into the drive controller and the supporting software running on the host microcomputer, not found in most of the present implementations, is presented here. The user has access to all internal variables, statuses and I/O ports which can be presented numerically or graphically. Some fault processing, fault message storage and display methods are also shown. The purpose of this article is not to show a complete rescue, but to present some ideas and implementation details.

	AUTOMATIC DIAGNOSTICS OF H.V. HIGH-POWER THYRISTOR CONVERTERS By A. Pawlaczyk	[View] [Download]
Abstract: It is difficult to explain the causes of failures of high-power converters in service. One of the possible solutions of this problem is to determine the state of thyristors and diodes of the converter before switching on the supply voltage and then, to supervise them with an automatic localisation of failures and to determine their causes and the circumstances of their appearance. The principle of the automatic determination of the causes of failures as well as the design and operation of the diagnostic equipment are considered.

	USE OF SIMULATION IN FAILURE DETECTION AND DIAGNOSIS OF AN ELECTROMECHANICAL SYSTEM By O. Normand; S. Catellani; G. Champenois	[View] [Download]
Abstract: Digital simulation can be efficiently used for defect detection and diagnosis in an electromechanical system. Here, the goal is to detect faults in the behaviour of a four quadrants chopper supplying a DC motor. A reference model is built as close to the real system as possible. Both reference model and average corresponding model are simulated simultaneously. The diagnosis will be based on the difference between the results of the two models. Thanks to the use of an adaptable integration step in the simulation, the accuracy of the reference model will be improved as well as the calculation time.

	DYNAMIC BEHAVIOUR OF DIGITAL PHASE-LOCKED LOOPS IN A COMMUNICATION SYSTEM FOR DRIVES By B. Gick	[View] [Download]
Abstract: The clock recovery in the Serial Real Time Communication System for Drives (SERCOS interface) is investigated. In order to regenerate the receiver clock and the incoming stream of data, all digital phase-locked loops (ADPLLs) are used. The dynamic behaviour of a chain of ADPLLs is analysed, the theoretical considerations are verified by measurements at an experimental ring. As a result, the constraints for mixing different kinds of ADPLLs in a ring are shown.

	DIAGNOSTIC INDEXES FOR KNOWLEDGE BASE REPRESENTATION OF INDUCTION MACHINE STATOR SHORT-CIRCUITS By G. Franceschini; C. Tassoni; F. Filipetti; M. Martelli; G. Gentile; N. Rotondale	[View] [Download]
Abstract: The diagnosis of stator short circuits of induction machines are considered, with the aim to pointed out diagnostic indexes to be inserted in the knowledge base representation of machine faults. To remove the assumption of uniform temperature, an arcing resistance of the short circuit is introduced and suitable variables are looking for pointing out the short circuit parameters. It is so possible to overcome the discrepancies between the theoretical results, obtained with the usual machine model, and the experimental results. The diagnostic features of the procedure proposed are presented and discussed.

	SIMULATION AND REALISATION OF AN INDUCTION MOTOR SERVO CONTROLLED BY A SINGLE-PULSE CYCLOCONVERTER By S. Lloyd; Z. Baykan; S. Saleh-Ud-Din	[View] [Download]
Abstract: The paper describes the modelling, simulation and realisation of an induction motor servo controlled by a single-pulse cycloconverter. The motor shaft positioning dynamics are investigated by means of a computer simulation and the results compared with those obtained from a practical servo.