Lenze i700 Manual - Manual (Page 126)

Safety engineering
Introduction
10
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126 EDS700ACBA EN 4.0
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.
Integrated safety engineering
i700 controllers are available with drive−based safety.
The integrated safety system can be used for the protection of persons working on machi-
nes in accordance with the Machinery Directive.
The motion functions continue to be executed by the controller. The integrated safety sy-
stem monitors the safe compliance with the limit values and provides the safe inputs. If
monitored limit values are exceeded, the integrated safety system starts control functions
directly in the controller according to EN 60204−1 to counteract possible errors.
The safety functions are suitable for applications according to IEC 61508 to SIL 3 and
achieve a performance level (PL) e and the control category 4 according to EN ISO 13849−1.