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06/10 MN03402004Z-DE/EN
Probability P
diag
of test function failure should be less than
or equal to one percent. This yields test interval T:
For test interval T, this yields a time of three years, which
fully meets the above requirement for test interval T.
Conclusions
The hazard analysis was performed on the basis of EN ISO
14121-1, Annex 1, Table A.1, EN ISO 12100-1, Chapter 4,
and EN ISO 12100-2 using a list of hazards covering both
standards.
For typical applications in the chemical industry to
IEC 62061 a required safety integrity level SIL 2 has been
derived.
For typical applications in the field of machinery safety to EN
ISO 13849-1, a Performance Level PL
r
= PL e has been
determined.
Preventive measures for both random and systematic faults
have been investigated. The rate of undiscovered hazardous
failures does not exceed the threshold of 10
-6
/h defined for
SIL 2.
P
diag
=
l
diag
x T = 350 FIT x T
F
1 %
h
Motor-protective circuit-breaker must be subjected to
annual testing,
Summary of Contents for PKE12 Series
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