BS EN 61800-5-2:2017 - Adjustable speed electrical power drive systems. Safety requirements. Functional

BS EN 61800-5-2:2017

Adjustable speed electrical power drive systems. Safety requirements. Functional

Status : Current   Published : September 2017



This part of IEC 61800, which is a product standard, specifies requirements and makes recommendations for the design and development, integration and validation of safety related power drive systems ( PDS(SR)) in terms of their functional safety considerations. It applies to adjustable speed electrical power drive systems covered by the other parts of the IEC 61800 series of standards as referred in IEC 61800‑2.


The term “integration” refers to the PDS(SR) itself, not to its incorporation into the safety-related application.


Other parts of IEC 61800 cover rating specifications, EMC, electrical safety, etc.

This International Standard is applicable where functional safety of a PDS(SR) is claimed and the PDS(SR) is operating mainly in the high demand or continuous mode (see 3.15)

While low demand mode operation is possible for a PDS(SR), this standard concentrates on high demand and continuous mode. Safety sub-functions implemented for high demand or continuous mode can also be used in low demand mode. Requirements for low demand mode are given in IEC 61508 series. Some guidance for the estimation of average probability of dangerous failure on demand (PFD avg) value is provided in Annex F.

This part of IEC 61800 sets out safety-related considerations of PDS(SR)s in terms of the framework of IEC 61508, and introduces requirements for PDS(SR)s as subsystems of a safety-related system. It is intended to facilitate the realisation of the electrical/ electronic/ programmable electronic (E/E/PE) parts of a PDS(SR) in relation to the safety performance of safety sub-function(s) of a PDS.

Manufacturers and suppliers of PDS(SR)s by using the normative requirements of this part of IEC 61800 will indicate to users (system integrator, original equipment manufacturer) the safety performance for their equipment. This will facilitate the incorporation of a PDS(SR) into a safety-related control system using the principles of IEC 61508, and possibly its specific sector implementations (for example IEC 61511, IEC 61513, IEC 62061 or ISO 13849).

By applying the requirements from this part of the IEC 61800 series, the corresponding requirements of IEC 61508 that are necessary for a PDS(SR) are fulfilled.

This part of IEC 61800 does not specify requirements for:

  • the hazard and risk analysis of a particular application;

  • the identification of safety sub-functions for that application;

  • the initial allocation of SILs to those safety sub-functions;

  • the driven equipment except for interface arrangements;

  • secondary hazards (for example from failure in a production or manufacturing process);

  • the electrical, thermal and energy safety considerations, which are covered in + IEC 61800‑5‑1;

  • the PDS(SR) manufacturing process;

  • the validity of signals and commands to the PDS(SR).

  • security aspects (e.g. cyber security or PDS(SR) security of access)


The functional safety requirements of a PDS(SR) are dependent on the application, and can be considered as a part of the overall risk assessment of the installation. Where the supplier of the PDS(SR) is not responsible for the driven equipment, the installation designer is responsible for the risk assessment, and for specifying the functional and safety integrity requirements of the PDS(SR).

This part of IEC 61800 only applies to PDS(SR)s implementing safety sub-functions with a SIL not greater than SIL 3.

Figure 1 shows the installation and the functional parts of a PDS(SR) that are considered in this part of IEC 61800 and shows a logical representation of a PDS(SR) rather than its physical description.

[Image removed.]

Standard NumberBS EN 61800-5-2:2017
TitleAdjustable speed electrical power drive systems. Safety requirements. Functional
Publication Date22 September 2017
Normative References(Required to achieve compliance to this standard)IEC 61000-4-6:2013, IEC 61000-4-3:2006/AMD1:2007, IEC 61000-6-7:2014, IEC 61000-4-2:2008, IEC 61800-2:2015, IEC 61508-3:2010, IEC 61508-1:2010, IEC 61800-1:1997, ISO 13849-1:2006, IEC 61400-21:2008, IEC 61000-4-5:2014, IEC 61800-4:2002, IEC 61508-6:2010, IEC 61000-4-29:2000, IEC 61000-4-3:2006, IEC 61800-3:2004, IEC 61508-2:2010, IEC 61000-4-4:2012, IEC 61800-3:2004/AMD1:2011, ISO 13849-2:2012, IEC 61800-5-1:2007, IEC 60204-1:2016, IEC 61000-2-4:2002, IEC 61000-4-34:2005, IEC 61000-4-3:2006/AMD2:2010, IEC 61508-7:2010
Informative References(Provided for Information)IEC 61784-3:2016, IEC 61508-5:2010, IEC 61558-2-3:2010, IEC 62280-2:2002, IEC 60664-3:2016, IEC 61558-2-7:2007, IEC 62061:2005, IEC 61508-4:2010, IEC 62280-1:2002, IEC 60300-3-1:2003, IEC 61558-2-16:2009, IEC 61558-2-1:2007, EN 50495:2010, IEC 61558-2-4:2009, IEC 61511-1:2016, IEC 61165:2006, IEC 62425:2007, IEC 60050-191:1990, IEC 61513:2011, IEC 61078:2016, IEC 61558-2-13:2009, ISO/IEC GUIDE 51:1999, IEC 61558-2-5:2010, IEC 61025:2006, IEC 61511-2:2016, ISO 13849-2:2012, IEC 60664-1:2007, IEC 61558-1:2009
ReplacesBS EN 61800-5-2:2007
International RelationshipsEN 61800-5-2:2017,IEC 61800-5-2:2016
Draft Superseded By13/30278416 DC
DescriptorsElectrical equipment, Velocity, Electric motors, Adjustment, Electronic equipment and components, Control systems, Power transmission systems, Equipment safety, Variable-speed drives, Programming, Electrical components, Electrical safety, Electrical transmission systems
Title in FrenchEntraînements électriques de puissance à vitesse variable
ISBN978 0 580 81980 3
File Size1.625 MB

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