Safety engineering
Introduction
10
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EDS84ASC552 EN 6.0
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 caused by failures.
During normal operation, safety 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−based safety provides the conditions in the controls and drives to optimise the safety
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 safety can be used for the protection of persons working on machines.
The drive function continues to be executed by the controller. The safety unit provides the
safe inputs. When the safety function is activated the safety unit starts control functions
according to EN 60204−1 directly in the controller for the case of an error.
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