9
05.01
9.4 Application examples
9-359
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Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
Table 9-8
Determining the diagnostic coverage level (DC)
Parameter
Value
Comment
DC (channel 1)
90 %
Testing –K1 in the feedback circuit of –A1
DC (channel 2)
90 %
Testing –K2 in the feedback circuit of –A1
DC
avg
90 %
→
average
DC
avg
= DC (channel 1) = DC (channel 2)
S
Structure of the SRP/CS corresponding to Category 3
S
MTTF
d
is high
S
DC
avg
is average
S
sufficient measures against common cause failures
Acc. to EN ISO 13849–1:2008 Annex K, PLe with PFHd = 4.29 x 10–8 / h is
attained.
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.
Table 9-9
Measures according to EN ISO 13849–1 to attain SRP/CS from Category 2 and higher
Measure
Points
Physical separation between the signal paths:
S
Separate wiring in the control cabinet
S
Sufficient creepages and clearances on printed circuits
15
Protection against overvoltage, overcurrent
15
Using well–proven components
5
Diversity regarding the technology is applied as a result of the internal structure of the elements to evaluate
and respond.
20
The requirements regarding sensitivity to all of the relevant ambient conditions, such as temperature, shock,
vibration, humidity (for example as defined in the applicable standards) have been taken into account.
10
The design engineers have been trained to identify the reasons and effects of failures as a result of common
causes.
5
Total
70
In total, the adequate number of 65 points is reached.
Determining DC
Determining the
Performance Level
9 Cabinet Design and EMC
02.12