Risk Analysis/Assessment - Siemens SINAMICS S120 Function Manual

1.2.7

Risk analysis/assessment

Risks are intrinsic in machines due to their design and functionality. For this reason, the
Machinery Directive requires that a risk assessment be performed for each machine and, if
necessary, the level of risk reduced until the residual risk is less than the tolerable risk.
To assess these risks, the following standards must be applied:
● EN ISO 12100-1 "Safety of Machinery - basic terminology, general principles for design"
● EN ISO 13849-1:2006 (previously EN 954-1) "Safety of machinery"
● EN ISO 14121-1 (previously EN 1050, Paragraph 5) "Safety of machinery - Risk
EN ISO 12100-1 focuses on the risks to be analyzed and the design principles for minimizing
risk. EN ISO 14121-1 describes the iterative process for assessing and minimizing risk to
achieve the required level of safety.
The risk assessment is a procedure that allows hazards resulting from machines to be
systematically investigated. Where necessary, the risk assessment is followed by a risk
reduction procedure. When the procedure is repeated, this is known as an iterative process.
This can help eliminate hazards (as far as this is possible) and can act as a basis for
implementing suitable protective measures.
The risk assessment involves the following:
● Risk analysis
● Risk assessment (EN ISO 14121-1 Paragraph 8)
As part of the iterative process to achieve the required level of safety, a risk assessment is
carried out after the risk estimation. A decision must be made here as to whether the
residual risk needs to be reduced. If the risk is to be further reduced, suitable protective
measures must be selected and applied. The risk assessment must then be repeated.
Safety Integrated
Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
assessment"
– Determining the limits of the machine (EN ISO 12100-1, EN ISO 14121-1 Paragraph 5)
– Identifying the hazards (EN ISO 12100-1, EN ISO 14121-1 Paragraph 6)
– Estimating the level of risk (EN 1050 Paragraph 7)
Standards and regulations
1.2 Safety of machinery in Europe
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