Lenze 8400 protec Manual - Manual (Page 172)

Safety engineering
Introduction
11
l
172 EDS84DPS424 EN 5.0
11 Safety engineering
11.1 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 L−force | 8400 protec
Unlike control cabinet devices, decentralised drives are frequency inverters which are not
locally mounted but directly attached to the application on site. Due to this
product−specific property, they must meet demanding requirements for robustness and
class of protection.
8400 protec controllers are optionally available with drive−based safety.
"Drive−based safety" stands for applied safety functions, which can be used for the
protection of persons working on machines.
The motion functions are continued to be executed by the controller. The drive−based
safety monitors the safe compliance with the limit values and provides the safe inputs and
outputs. When the limit values are exceeded, the drive−based safety starts the control
functions according to EN 60204−1 directly in the controller.
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 3 or 4 depending on the safety
option according to EN ISO 13849−1.