Hydroservice is able to provide complete support in the development of hydraulic command and control systems that allow it to meet the essential health and safety requirements (RESS) of the Machinery Directive 2006/42 / EC .

The Directive prescribes that the control circuits with safety functions are designed and constructed in order to avoid the occurrence of dangerous situations and in particular in such a way that a failure in the hardware, in the software of the control system or in the plant hydraulics itself does not create dangerous situations for the operator.

The standard is a reference for the design of command and control circuits (SRP / CS) that allow the mitigation of risks for the operator is UNI EN ISO 13849-1: 2016. The standard specifies safety requirements and guidelines on the principles of design and integration of safety-related parts of control systems, including software design.

In this context, Hydroservice, making use of its technical skills in the hydraulic and mechatronics field, and using the SISTEMA certified software, is able to propose solutions aimed at improving the safety of the systems by selecting the most suitable architecture and components. to realize the safety function.

Hydroservice is therefore able to support its customers in the initial engineering phase during the analysis of type C product standards and the drafting of the risk analysis for the calculation of the required Performance Levels.
Once the required safety levels are known, the design of the system is subsequently performed by selecting the certified components which, appropriately coordinated, are able to meet all the technical parameters defined by the EN 13849-1 standard to achieve a certain performance level.

The parameters

In detail we evaluate for each safety circuit:

  • CCF (Common Cause Failure)
    This parameter defines the robustness of the circuit against a common cause of system failure. The calculation of the frequency of common failures is performed considering the technology used, the chosen architecture (category), the type of application and the environment in which the machine operates
  • MTTFd (Mean Time to Failure Dangerous)
    This parameter indicates the average life of a component before a dangerous failure occurs. From this parameter it is possible to calculate the dangerous failure rate (ld)
  • B10d
    This value represents the average number of cycles a component can perform before suffering a dangerous failure. To correctly calculate this parameter it is necessary to define the cyclogram of the machine to define the number of operations that the component itself must perform, the hours of operation and the frequency of use
  • DC (diagnostic coverage)
    This parameter defines the diagnostic coverage that the control system is able to perform on the components that perform the safety function.

At the end of the design, Hydroservice releases the report for calculating the performance level [PL] reached which must be integrated by the customer in the technical file of their machine to document the fulfillment of the essential safety requirements defined within the Machinery Directive.

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