9
05.01
9.4 Application examples
9-376
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Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
Table 9-22
Determining the diagnostic coverage level (DC)
Parameter
Value
Comment
DC (channell 1)
99 %
Testing –K1 (–A11...–A16) via –K3 in the feedback cir-
cuit of –A2, as well as –K6 at –A3 each time the protec-
tive door is closed.
DC (channel 2)
90 %
Testing –K2 and –K3 in the feedback circuit of –A1
when EMERGENCY STOP is requested.
Undetected fault accumulation is possible between the
demands.
Testing –K4 in the feedback circuit of –A2 each time the
protective door is closed.
DC
avg
93,3 %
→
average
MTTF
d
(channel 1)
1
MTTF
d
(channel 2)
1
+
DCavg =
MTTF
d
(channel 1)
DC
1
MTTF
d
(channel 2)
DC
2
+
S
Structure of the SRP/CS corresponding to Category 3
S
MTTF
d
is average
S
DC
avg
is average
S
Sufficient measures against common cause failures
Acc. to EN ISO 13849–1:2008 Annex K PLd with PFH
d
= 5,5 x 10
-7
/ h is attai-
ned.
Note
Contactor relays –K3, –K4 and –K6 should be replaced in plenty of time.
Operating time T
10d
= B
10d
/ n
op
= 2,54 years.
Measures against common cause failures CCF of the
safety function
According to EN ISO 13849–1 Annex F, for SRP/CS from Category 2, a mini-
mum of 65 points is required.
The considerations according to Chapter 9.4.1 Table 9-9 apply.
This means that in total, the adequate number of 65 points is reached.
Determining DC
Determining
Performance Level
9 Cabinet Design and EMC
02.12