1S9STOEN_26-5-17_ADL300_STO_STO Pag. 6/30
2 Risk analysis and assessment
According to Machinery Directive 2006/42 EC, it is mandatory for the manufacturer of the
machines to carry out risk analysis in order to identify the hazards related to the machine.
Risk analysis should be developed according to Standard EN 12100 - Safety of Machinery- Risk
assessment.
Risk assessment procedure is intended to prevent and identify:
degree of injury
frequency/duration of risk exposure
possibility of turning away
In order to define risk level and to obtain a correct classification concerning Safety category, SIL
(Safety integrity level), standards EN61800-5-2, IEC 61508, EN ISO 13849-1 should be used and
applied.
These standards give information and procedure according to design principle and risk
assessment for safety related part of control systems.
In the case of STO safety function the risk assessment must consider the fact that the motor
coast to a standstill at STO activation. A mechanical brake may be requested in some
applications. Latching devices preventing access to dangerous parts might also be necessary
enabling automatically STO function.
EN81-1 intended for safety in lift applications specifies, functions, safety integrity level and
conFiguretions to be used to attain given system level functionalities.
Liability :
The Manufacturer shall be responsible for the safety of the machinery, in term of :
risk analysis of hazards originating from machinery.
implementation of measures either to minimize or eliminate any risks.
documentation of residual risk.
production of whole machinery documentation.
The User/Operator is responsible for safety concerning application and use.
Safety function implementation and selection according to application. STO safety
function integration:
Risk analysis and risk assessment according to EN 12100.
Risk reduction by machine design.
Risk reduction by protective equipment.
Identification of safety requirements.
SIL, Category selection.
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