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national committees, the International Electrotechnical Commission (IEC) is the leading standards organization in the electrotechnical area. Many countries around the world have their own national versions of the IEC standards.
Because of growing uncertainty on the market as to which standard should be considered most important for a machine control panel, the German Commission for Electrical, Electronic and Information Technologies of DIN and VDE (DKE) has published a statement on this subject.
Various standards have to be observed for the construction of control panels for machinery. IEC 60204-1 is the relevant standard, but it is the manufacturer's responsibility to ensure the best possible electrical safety of the control panel.
This is why we recommend that a risk analysis be carried out. For the European market, this is even stipulated in the relevant directives. If further risks are identified during the risk analysis that, in the opinion of the manufacturer, are not covered by IEC 60204-1, then IEC 61439-1/-2 and, if necessary, other standards may also be consulted as an additional design aid. The DKE (Deutsche Kommission Elektrotechnik Elektronik Informationstechnik/German Commission for Electrical, Electronic & Information Technologies) has also published a recommendation in this regard.
Basic safety standard IEC 60204-1, “Electrical equipment of machinery – Part 1: General requirements for the electrical equipment of machines” constitutes an important standard for control panels as part of a machine.
Scope of IEC 60204-1
Outlook: Revision of IEC 60204-1
In recent years, the International Electrotechnical Commission worked on a new version of IEC 60204, which was published in late 2016. It is expected that national standards will be derived from this from late 2017 onward. The new standard has not yet been incorporated in the Official Journal of the European Union.
The new version mainly involved the revision or introduction of the following topics:
IEC 61439 is the standard for low-voltage switchgear and controlgear assemblies and, following a transitional period, has had sole validity since 2014. Parts 1 and 2 establish safety requirements for power switchgear and controlgear assemblies, which may also be of relevance to machine control panels.
EU Directives set forth the product requirements that apply throughout Europe. Products marketed in the European Economic Area must satisfy the protection goals of the applicable Directive or Directives.
The essential Directives governing control panels for machines are the Low Voltage Directive 2014/35/EU and the EMC Directive 2014/30/EU. The Directives refer in turn to harmonized EN standards, which in most cases are borrowed from the IEC standards.
The CE mark is a legally prescribed label for all products that comply with EU Directives, and is thus essentially a “technical passport” for products within the European Economic Area. The EU declaration of conformity forms the basis for CE labeling of a product: it is the manufacturer’s declaration that the product it is marketing complies with the fundamental health and safety requirements of all relevant European Directives, i.e. that it is in conformity with them.
The CE mark must be applied directly to the product. If this is not possible on technical grounds, the packaging and/or accompanying documentation (instructions for use, certificate of warranty) may also be used for the CE mark.
Starting in 2008, EU Directives have been standardized as part of the New Legislative Framework (NLF). On April 20, 2016, the new versions of a total of eight EU Directives were transposed into national legislation of the EU member countries, including the Low Voltage, EMC and ATEX Directives.
The Low Voltage Directive stipulates the following safety objectives:
Protection against hazards arising from the electrical equipment
Protection against hazards which may be caused by external influences on the electrical equipment
It’s essential to identify the right Directive in each case, since this will affect the standard to be applied and the cost and effort required for the declaration of conformity and documentation.
The following EU Directives may be of relevance to control panels and machines:
Save time when selecting, laying out and dimensioning our globally certified products. Use our tools to arrange the technical features of products and systems, easily and intuitively, to suit the requirements of your application.
The safe, efficient and convenient examination of heat in compliance with the standards is a major challenge in planning and building a control panel. The legal and normative requirements not only have to be taken into account but also added to the documentation for an industrial control panel as part of a technical risk assessment. The same applies to electromagnetic compatibility.
Consideration of short-circuit capability is fundamental to building a safe control panel. That’s why the expected minimum and maximum short-circuit current at the machine’s infeed (RMS value in kA) must be agreed upon between the customer and machine manufacturer.
With the SIMARIS design software, you draw up a grid calculation, including a calculation of short-circuit current, based on real products with a minimum number of inputs – by calculating the medium voltage up to the power outlet. In addition to grid calculation, the software also calculates short-circuit current, load flow, voltage drops and energy balance.
The standard for electrical equipment of machines does not include proof of short-circuit.
All it states is that:
Proof of rated short-circuit currents as per IEC 61439-1 may be provided as follows:
Comparison against a reference design (check-list or calculation)
There is no need to demonstrate the short-circuit capability of electrical circuits in the following cases:
Use our overview of let-through values for this, e.g. for circuit-breakers and fuses.
Both international standards and European Directives contain rules on documentation. We provide a general overview of the requirements and our tools help ensure easy, time-saving implementation.
The information needed for setting up, operating and maintaining the electrical equipment within a machine must be supplied in appropriate versions according to IEC 60204. The information must be provided in an agreed language.
The customer documentation must contain the following elements:
A comprehensive description of the equipment
Operating manual, maintenance manual
According to IEC 61439-1, the technical documentation must include all identifying features of the switchgear and controlgear assembly.
These include the following:
The customer documentation as per IEC 61439-1/2 also contains the following:
Technical documentation must be written in a language that can be easily understood in the target country. It must be kept available for the authorities for ten years after the electrical equipment was last placed on the market.
The technical documents must contain at least the following elements:
A suitable risk analysis and assessment is part of the conformity assessment procedure. This is necessary in addition to a risk analysis and assessment that may be conducted, if applicable, within the scope of the Machinery Directive.
“Reasonably foreseeable” operating errors must also be considered during the assessment procedure.
To perform the risk analysis within the scope of the Directive, the European Committee for Electrotechnical Standardization (CENELEC) offers the CENELEC Guide 32 as guidance for safety related risk assessment and risk reduction for low voltage equipment.
Many small steps are involved in drawing up documentation. Looking for documents, finding and compiling them is often a time-consuming and complex task. Our tools make it possible to draw up the documentation in parallel with the engineering process.
Documentation included – our practical planning tools
Our tools not only help with standards-compliant product selection, dimensioning and layout of your control panel: many outputs and reports can also be used as supporting materials for your documentation. For example, you can use:
Much of the data that is needed for documentation in compliance with standards and Directives can be downloaded using the CAx Download Manager. Just enter the article numbers for the Siemens products from your parts list and you can get all the available product data in a single package:
White paper changes for power drive systems
The new edition of IEC 60204-1, which is used as a reference for the electrical safety of machinery and industrial control panels, also contains technical changes for applications involving power drive systems, e.g. the safe standstill of drives. Find out how these changes are applied in practice in our compact white paper.
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