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3.2. Safety and Safe Torque Off (Blocking on restart)
The DR2020 includes the Safe Torque Off (STO) function, according to standards EN 61800-5-2; EN/ISO 13849-1:2006. (SILCL 3
PL “e” (as certified below). The function also corresponds to an uncontrolled stop, according to the 0 stop category of IEC/
EN 60204-1.
Function validation is based on:
• a guarantee that a single failure does not result in loss of the safety function
• some, but not all, possible failures may be identi
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ed
• the sum of several unidenti
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ed failures may result in loss of the safety function
The residual risk if two failures occur concurrently in the same power section is that the motor rotates at an angle dependent on
the number of polar pairs of the motor; for example, a 6-pole motor will generate a maximum rotation of 60°.
WARNING
The manufacturer of the end machine and/or equipment must carry out and provide results of a risk analysis of the
machine according to ISO12100 and ISO14121 and take all measures necessary to prevent unforeseen movements
that may harm persons or damage property. In particular the manufacturer of the end machine and/or equipment
must ensure conformity to relative product standards.
AVERTISSEMENT
Le fabricant de la machine et / ou de l'équipement final doit exécuter et fournir les résultats d'une analyse de
risque de la machine selon ISO12100 et ISO14121 et prendre toutes les mesures nécessaires pour empêcher des
mouvements imprévus qui peuvent nuire aux personnes ou endommager des biens. En particulier, le fabricant de la
machine et / ou de l'équipement final doit assurer la conformité à toute norme spécifiques relatives aux produits
mêmes.
Where safety functions are based on electrical/electronic devices (SCRF), the safety integrity levels (SIL) and functional
requisites must be indicated for these functions.
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Based on CEI EN 62061, this speci cation must include all data that may affect design of the electrical/electronic device,
including, where applicable:
• Operating conditions of the machine
• The priority of functions that may be enabled concurrently and cause con
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ictual actions
• The operating frequency of each SCRF
• The required response time of each SCRF
• A description of each SCRF
• The interface of each SCRF with other machine functions
• A description of the reactions to failure and constraints relative to machine restart, when the reaction to failure causes the
machine to stop
• A description of the operating environment
• Tests and associated equipment (e.g. access hatches)
• The frequency of operating cycles and factor of use in operating cycles
