Siemens 6SN1123-1AA00-0DA2 Configuration Manual page 376

02.12
05.01
Determining
MTTF
d
Table 9-21
Channel 1
Safety relay –K1
B
n
MTTF
Contactor relay –K6
B
n
MTTF
relay)
Zwischenergebnis Kanal 1
MTTF
Channel 2
Line contactor –K2 and contactor relay –K5
B
n
MTTF
Contactor relays –K3, –K4
B
n
MTTF
relay)
Intermediate result, channel 2
MTTF
Intermediate result, RESPOND (channel 1 and 2)
MTTF
(RESPOND)
© Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
Determining MTTF
Parameter Value
value 20.000.000
10d
525612 per
op
year
(–K1) 951 Jahre
d
value 1.333.333
10d
525612 per
op
year
(contactor 25,3 years
d
(channel 1) 21,8 years
d
value 1.333.333
10d
12 per
op
year
(–K2) 1.111.111 years
d
value 1.333.333
10d
525612 per
op
year
(contactor 25,3 years
d
(channel 2) 12,6 years
d
17,6 years
d
→ average
2
MTTF = MTTF
d
–
3
9 Cabinet Design and EMC
9.4 Application examples
d
Comment
Manufacturer's data
525600 per year by the protective door + 12 per
year by EMERGENCY STOP
B
10d
MTTF =
d
0,1 x n
op
Manufacturer's data
525600 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
= ∑
MTTF (–K1[–A11...–A16], –K6)
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
525600 per year by the protective door + 12 per
year by EMERGENCY STOP
B
10d
MTTF =
d
0,1 x n
op
1
MTTF (Kanal 1)
d
= ∑
MTTF (–K2, –K3, –K4, –K5)
d
Symmetrization of both channels is not neces-
sary
(channel 1) + MTTF (channel 2)
d1 d
1
MTTF (channel 1)
d
1
1
1
1
+
MTTF (channel 2)
d
9-375
9