Panasonic is part of a large worldwide groupselling relays and associated switching products under different brand names in different territories.The conditions of use in some territories may differ from those customary in Europe. In particular there are often major differences in regard to national and international specifications, such as UL, CSA, VDE, SEV, EVE, SEMKO, etc. Thus, when considering contact loads as stated in this catalogue (e.g. 10 A, 30 VDC for the SP relay) its hould be understood that these values are not necessarily an absolute maximum but tested ratings. Mostly the stated value has been tested for a certain life expectancy as stated by the manufacturer or the respective test house. Thus, under different conditions, the stated “maximum” may, in practice, be safely exceeded.
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c lle lia ility ts
m lia ility In
th stry, lia ility a
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s ility ility r
p itio lia ility t
d rio r
th rin stry. rt,
re lia ility i. Reliability (narrow sense), durability
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Low failure rate: Lamda (X), MTBF
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re lia ility fin in, tim is
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th life tim ilu . MTBF
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th ility ,
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to tin rs
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m ilu te. MTTF
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fa ilu tim rio d
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fu tio tio n
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a it.
2.
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re ira as
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Availability
3. Reliability Broad Sense the
Term
E fin ite life tim .e.9%
M TBF 100 hours
M TTF 100 hours
Failure rate fit, /hour
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(c) Safe life
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64
. Design reliability
Human factor, redundancy,
fool-proof, fail-safe
[2] RELIABILITY MEASURES
T llo list e
m lia ility :
Reliability measure
Sam ple
representation
Degree reliability R(T) 99.Excerpts from Technical Information
RELIABILITY
[1] WHAT RELIABILITY?
1. Failure Rate
F ilu ilu te
a ilu rate.
3. Intrinsic Reliability and Reliability
of Use
R lia ility ilt” is
re rre trin lia ility h
c lia ility rro w
s . Maintainability
MTTR
Preventive maintenance, predicted
maintenance
3
