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.
64
. Degree Reliability
D lia ility ts
p tio lia ility.Excerpts from Technical Information
RELIABILITY
[1] WHAT RELIABILITY?
1.
T tin e
n fin ite t
h it
Reliability
(broad sense)
a it. Failure Rate
F ilu ilu te
a ilu rate.
F ilu fte e
u t/h rts ith w
fa ilu “fa ilu it) 10-9 /
h fte ilu te. Intrinsic Reliability and Reliability
of Use
R lia ility ilt” is
re rre trin lia ility h
c lia ility rro w
s . Reliability Broad Sense the
Term
E fin ite life tim . 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.
Availability
3.
P t/c lly ys. r
e lig s
fa ile f
re lia ility fin in, tim is
1 s
re live lia ility is
3 . Maintainability
MTTR
Preventive maintenance, predicted
maintenance
3.
2.
2. rt,
re lia ility i. Reliability (narrow sense), durability
Long life time: MTTF, B10, R(T),
Low failure rate: Lamda (X), MTBF
2.
M ilu fin llo :
M ilu tal ilu t/
to tin rs
In ilu to
m ilu te.e.
F ira ir
s ility ility r
p itio lia ility t
d rio r
th rin stry.
3. ts
th ility ,
e rt, tin d
n tio rta f
tim lty t
s ifie tim rio . Reliability Narrow Sense the
Term
In tria rld lia ility an
in rtic t
s ith ilu .
1.
P lia ility r's ite is
c lle lia ility ts
m lia ility In
th stry, lia ility a
s ific . lia ility
o itse lf, ility e
p lia ility .
4. MTTF
M tim to
fa ilu tim rio d
u til lty F
n lly lie ira ts
s rts ria . lia ility f
re ira as
“ lia ility .
S tim t
th life tim ilu .9%
M TBF 100 hours
M TTF 100 hours
Failure rate fit, /hour
Safe life B10 hours
(b) MTTF
(c) Safe life
1.
T tiv f
M TTF . F
o lie ira .
T fin e
d lia ility llo :
T ility ,
e ifie d
fu tio tio n
u ifie itio . MTBF
M tim e
b ilu n
tim rio ,
e lly
b pair.
M lls be
u ith repair
