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.
Failure Rate
F ilu ilu te
a ilu te.
2. Reliability (narrow sense), durability
Long life time: MTTF, Bio R(T),
Low failure rate: Lamda (^), MTBF
2.
Availability
3.
F ira ir
s ility ility r
p itio lia ility t
d rio r
th rin try rt,
re lia ility i.
P lia ility r's ite is
c lle lia ility ts
m lia ility In
th try lia ility a
s ific .
3. lia ility
o its lf, ility e
p lia ility .
F ilu fte e
u t/h rts ith w
fa ilu “fa ilu it) 10-9 /
h fte ilu te.
2.
T tin e
n fin ite t
ha it
Reliability
(broad sense)
a it.Reliability
RELIABILITY
[1] WHAT RELIABILITY?
1.
T fin e
d lia ility llo :
T ility ,
e ifie d
fu tio tio n
u ifie itio . F
o lie ira .
P t/c lly ys. Reliability Broad Sense the
Term
E fin ite life tim .
T tiv f
M .
M ilu fin llo :
M ilu ilu t/
to tin rs
In ilu to
m ilu 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 . Design reliability
Human factor, redundancy,
fool-proof, fail-safe
[2] RELIABILITY MEASURES
T llo list e
m lia ility :
Reliabilitymeasure Sample
representation
DegreeofreliabilityR(T) 99. MTBF
M tim e
b ilu n
tim rio ,
e lly
b ir. MTTF
M tim to
fa ilu tim rio d
u til lty F
n lly lie ira ts
s rts ria .
ds_x61_en_relay_technical_information_091112D 631
T
TechnicalInfo. Maintainability
MTTR
Preventive maintenance, predicted
maintenance
3. lia ility f
re ira as
“ lia ility .
M lls be
u ith ir.
S tim t
th life tim ilu .
1.
4.9%
MTBF 100hours
MTTF 100hours
FailurerateX 20fit,1%/hour
SafelifeB10 50hours
(a) R(T)
(b) MTTF
1. Intrinsic Reliability and Reliability
of Use
R lia ility ilt” is
re rre trin lia ility h
c lia ility rro w
se .e.
. Degree Reliability
D lia ility ts
p tio lia ility r
e lig s
fa ile f
re lia ility fin in, tim is
1 s
re liv lia ility is
3
