Introduction to IEC 61800-5-2, Adjustable Speed Power Drive Systems

May 26, 2011
Part 5-2: Safety Requirements - Functional

This workshop is ideal for product design, safety, or management personnel involved in the development of electronic or programmable systems that may have safety implications. It is also applicable to a company’s product engineering processes as they relate to safety requirements and standards.

 Prerequisites for the course:

  • An understanding of the following Functional Safety Concepts (in accordance with IEC 61508)
  • o Functional safety management

    § In particular, the safety development lifecycle (V-model)

    § Specific aspects and activities: safety requirements specification, FMEDA, Markov, software criticality analysis, traceability, verification and validation plans, safety case construction

    o Fail-safe, fail operational

    o Random failures, systematic failures

    o Safety Integrity Level

    § Determination

    § Requirements and verification

    -  Probability of Failure per Hour (PFH), Probability of Failure on Demand (PFD)

    -  Hardware fault tolerance

    -  Diagnostic capabilities

    -  Common cause failures

    -  Systematic safety integrity

    o Environmental impacts (electromagnetic immunity, temperature, humidity, mechanical shock and vibration)

  • General understanding of electrical motor drives
  • o Application, functionality

    o Technology

     The learning outcomes for those attending the workshop include:

  • An understanding of why safety functions are integrated in electrical motor drives
  • Knowledge of how to implement safety functions in a motor drive
  • An understanding of functional safety, from both a systems and component perspective
  • An understanding of the need for functional safety management; differences from IEC 61508
  • Clear grasp of typical safety functions (e.g., when a fail-safe state exists for machinery, elevators/lifts, processes)
  • An overview of design requirements: where IEC 61800-5-2 is more explicit or precise than IEC 61508
  • Requirements related to usage instructions; in particular, related to commissioning from “non-safe” platforms
  • Workshops may be attended at UL facilities. However, if your organization plans on sending five or more individuals to a workshop, it may be cost effective to have UL present the course as a private workshop at your facility. For more information, please visit us on the web at

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