Lenze E94AYAB − SM100 - Manual (Page 9)

Safety engineering
Basics
Hazard and risk analysis
1
l
9 EDS94AYAB EN 2.1
1.1.6 Hazard and risk analysis
This documentation can only accentuate the need for a hazard analysis. The user of
drive−based safety must concentrate on dealing with the standards and legal position:
Before putting a machine into circulation, the manufacturer of the machinemust carry out
a hazard analysis according to the Machinery Directive2006/42/EC (until 28 December
2009: 98/37/EC) to find out the hazards related to the application of the machine. To
achieve a level of safety as high as possible the Machinery Directive contains three
principles:
ƒ Removing or minimising the hazards by the construction itself.
ƒ Taking the protective measures required against hazards that cannot be removed.
ƒ Documentation of the existing residual risks and training of the user regarding
these risks.
The execution of the hazard analysis is specified in EN 1050, guidelines for risk assessment.
The result of the hazard analysis determines the categoryof safety−based control modes
according to EN ISO 13849−1 which thesafety−oriented parts of the machine control must
comply with.
1.1.7 Standards
Safety regulations are confirmed by laws and other governmental guidelines and
measures and the prevailing opinion among experts, e.g. by technical regulations.
The regulations and rules to be applied must be observed in accordance with the
application.
1.1.8 Safety notes for the installation according to U
L
or U
R
J
Warnings!
ƒ Maximum surrounding air temperature: 55 °C.
ƒ External fuse for 24 Vdc supply voltage. Rated 4 A DC fuse UL248−14.
1.1.9 Overview of sensors
Passive sensors
Passive sensors are two−channel switching elements with contacts. The connecting cables
and the sensor function must be monitored.
The contacts must switch simultaneously (equivalently). Nevertheless, safety functions
will be activated as soon as at least one channel is switched.
The switches must be wired according to the closed−circuit principle.
Examples of passive sensors:
ƒ Door contact switch
ƒ Emergency−off control units