Instruction Manual

Safety engineering
Introduction
10
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270
EDS84ASC552 EN 9.1
10 Safety engineering
10.1 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 c aused by failures.
During normaloperation,safety equipment prevents people accessinghazardous 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-baseds afety provides theconditionsin thecontrolsand drivesto optimise 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
The controllers of the 8400 series are available with drive-based safety ”safe torque off
(STO)”.
Drive-based s afety can be used for the protection of persons working on machines.
The safety system provides the safe inputs. If the STO safety function is requested, the sa-
fety system directly c auses the torqueless status according to EN 60204-1.