Safety engineering
Introduction
8
102
EDS84DG752 EN 5.0
8 Safety engineering
8.1 Introduction
With increasing automation, protection of persons against hazardous movements is
becoming more important. Functional safety describes the measures needed by means of
electrical or electronic equipment to reduce or remove danger caused by failures.
During normal operation, s afety equipment prevents people accessing hazardous areas. In
certain operating modes, e.g. set-up mode, work needs to be carried out in hazardous
areas. In these situations the machine operator must be protected by integrated drive and
control measures.
Drive-basedsafety provides the conditionsin the controlsand drives tooptimise thesafety
functions. Planning and installation expenditure is reduced. In comparison to the use of
standard safety engineering, drive-based safety increases machine functionality and
availability.
Drive-based safety with Inverter Drives 8400
Decentralised drives are frequency inverters that are not mounted locally like control
cabinet devices but are directly attached to the application in the field. This
product-specific feature results in high demands regarding robustness and class of
protection.
The 8400 motec controllers are optionally available with an integrated safety system.
”Integrated safety” stands for application-oriented safety functions that are applicable on
machines for the protection of persons.
The motion functions continue to be executed by the controller. The integrated safety
system monitors the safe compliance with the limit values and provides the safe inputs
and outputs. If limit values are exceeded, the integrated safety system starts control
functions according to EN 60204-1 directly in the controller for the case of an error.
The safety functions are suitable for applications according to IEC 61508 to SIL 3 and
achieve the performance l evel (PL)e according to EN ISO 13849-1. The requirements of the
standard EN 954-1 valid until 30 November 2009 are met until control category 4.
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