Safety engineering
Important notes
Hazard and risk analysis
10
l
130
EDS700ACBA EN 5.1
During operation
After the installation is completed, the operator must check the wiring of the safety
function.
The functional test must be repeated at regular intervals. The time intervals to be selected
depend on the application, the entire system and the corresponding risk analysis. The
inspection interval should not exceed one year.
Residual hazards
In case of a short−circuit of two power transistors a residual movement of the motor of up
to 180 °/number of pole pairs may occur! (Example: 4−pole motor Þ residual movement
max. 180 °/2 = 90 °)
This residual movement must be considered in the risk analysis, e.g. safe torque off for
main spindle drives.
10.2.1 Hazard and risk analysis
This documentation can only accentuate the need for hazard analysis. The user of the
integrated safety system must read up on standards and the legal situation:
Before the launch of a machine, the manufacturer of the machine must conduct a hazard
analysis according to Machinery Directive 2006/42/EC to determine the hazards
associated with the application of the machine. The Machinery Directive refers to three
basic principles for the highest possible level of safety:
ƒ Hazard elimination / minimisation by the construction itself.
ƒ Required protective measures must be taken against hazards which cannot be
eliminated.
ƒ Existing residual hazards must be documented and the user must be informed of
them.
Detailed information on the hazard analysis procedure is provided in the
DIN EN ISO 12100:2013−08 − ""Safety of machinery − General principles for design, risk
assessment and risk reduction". The results of the hazard analysis determine the category
for safety−related control systems according to EN ISO 13849−1. Safety−oriented parts of
the machine control must be compliant.
10.2.2 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.
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