Captron safeCAP SC4, Оригинальная инструкция по эксплуатации

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■
Performance level e must be achieved.
■
d
op
= 250 d
■
h
op
= 24 h
■
t
cycle
= 10 s
n
op
[cycles / year]
n
op
= (d
op
* h
op
*3600 s) / t
cycle
n
op
= 250 d / y * 24 h / d * 3600 s / h / 10 s / cycle = 2,160,000 cycles / year
According to the operating instructions, the relay has a lifetime of approximately
20 million cycles before a dangerous failure can occur.
T
M
= 20,000,000 / n
op
T
M
= 20,000,000 / 2,160,000 = 9.3 years
According to this calculation, the relay has to be replaced after 9.3 years.
For other relays, values such as B
10D
or T
10D
can be specified. These values are
not considered here and can be requested from CAPTRON.
2.8 Equivalent T-network
If an equivalent T-network is used for the relay, the entire FIT value for the
equivalent T-network must be determined via an FMEDA or an equivalent
method.
The equivalent T-network must not exceed a FIT value of 45, and the MTTF
d
should be more than 45 years to meet the following formula:
MTTF
d
(Equivalent t-network) = MTTF
d
(safeCAP) * 30 / ( MTTF
d
(safeCAP) -
30).
Exception: MTTF
d
(safeCAP) = 100;
safeCAP SC4
safeCAP SC4 with
MCR-225
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