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9 Cabinet Design and EMC
9.4 Application examples
Determining
MTTF
d
9-370
Table 9-18
Determining MTTF
Parameter
Value
Channel 1
Safety relay –K1
B
value
20.000.000
10d
n
24972 per years
op
MTTF
(–K1)
8008 years
d
Contactor relay –K6
B
value
1.333.333
10d
n
24972 per year
op
MTTF
(contactor
534 years
d
relay)
Intermediate result, channel 1
MTTF
(channel 1)
501 years
d
Capped to 100
years
Channel 2
Line contactor –K2
B
value
1.333.333
10d
n
12 per year
op
MTTF
(–K2)
1.111.111 years
d
Contactor relay –K5
B
value
1.333.333
10d
n
12 per year
op
MTTF
(contactor
1.111.111 years
d
relay)
Intermediate result, channel 2
MTTF
(Kanal 2)
555.555 years
d
Capped to 100
years
Intermediate result, RESPOND (channel 1 and 2)
MTTF
100 years
d
→ high
(RESPOND)
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
d
Comment
Manufacturer's data
24960 per year by the protective door + 12 per
year by EMERGENCY STOP
B
10d
MTTF
=
d
0,1 x n
op
Manufacturer's data
24960 per year by the protective door + 12 per
year by EMERGENCY STOP
B
10d
MTTF
=
d
0,1 x n
op
1
MTTF
(Channel 1)
d
Manufacturer's data
12 actuations per year as a result of
EMERGENCY STOP
B
10d
MTTF
=
d
0,1 x n
op
Manufacturer's data
12 actuations per year as a result of
EMERGENCY STOP
B
10d
MTTF
=
d
0,1 x n
op
1
MTTF
(Kanal 1)
d
MTTF
values for both channels were capped
d
at 100 years → it is not necessary to symme-
trize both channels
© Siemens AG 2012 All Rights Reserved
02.12
05.01
1
= ∑
MTTF
(–K1, –K6)
d
1
= ∑
MTTF
(–K2, –K5)
d
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