Measurement of coasting of machinery

The issue of measuring the deceleration of machinery is a frequently discussed topic, especially when it is necessary to measure (deceleration of machinery) and on the basis of what legislative requirements.

In general, the manufacturer must make these measurements whenever safeguards are applied to ensure the safety of machinery by technical means which:

  1. It does not create a solid protective barrier between the operator and the danger zone, and it is therefore possible for body parts to enter the danger zone through the protective device. These protective devices include:
    - AOPD - active optoelectronic protective devices - light barriers (according to ČSN EN ISO 13 855; chapter 6);
    - PSPD - pressure-sensitive protective devices, eg protective strips and treads (according to EN ISO 13 855; Chapter 7)
    - Two-handed operation (according to EN ISO 13 855; Chapter 8)
  2. They monitor the position of the guard without locking it against opening during operation. The safety distance necessary for stopping dangerous parts must be maintained between the protective cover without protection and the danger zone (according to EN ISO 13 855; Chapter 9)

These safety devices can only be effective if the machinery is able to stop dangerous movements after the safety system has been activated before any part of the body can reach the danger zone for the operator.

This means that these protective devices must be located at a safe distance from the danger zone with regard to the speed of approaching parts of the human body according to the standard ČSN EN ISO 13 855: 2010.

When designing the machinery, this safety distance must first be calculated in accordance with the above-mentioned standard and verified after measurement with protective measures.

Legislative requirements

Measurement of deceleration is one of the steps in the process of demonstrating the conformity of a specified product. The exact requirements are set out in Directive 2006/42 / EC of the European Parliament and of the Council (Government Decree No. 176/2008 Coll.) In Annex VII, which deals with the technical documentation on the basis of which the EC declaration of conformity is issued for machinery. The run-down measurement protocols shall become an integral part of the technical documentation drawn up by the manufacturer or his authorized representative. It stipulates that the technical documentation shall include all test, measurement and technical reports on the basis of which the manufacturer demonstrates that it has complied with the relevant safety requirements as set out in the technical regulations and harmonized standards.

Measurement of deceleration also relates to regular safety checks of operated machinery according to Government Decree No. 378/2001 Coll. In §3 para. (b) the requirement to place the protective device at a safe distance from the danger zone is indicated. Furthermore, Section 4 (2) of the Government Decree No. 378/2001 Coll. the obligation for operators to carry out subsequent inspections of machinery is to be carried out at least once every 12 months to the extent specified by the local operating safety regulation, unless otherwise specified by special legislation or accompanying documentation or standard values. These checks also take measurements of the machine run-out, since during operation the braking parameters of the machine may deteriorate and the original safety distance specified by the manufacturer may be insufficient.


If protective measures are used to ensure the safety of machinery by the technical means mentioned in the introduction, the correct positioning of this protective device must be verified by measuring the overrun of dangerous parts of the machinery.

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