9
05.01
9.4 Application examples
9-357
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Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
Table 9-5
Parameters for the SENSE subsystem
Parameter
Value
Comment
EMERGENCY STOP pushbutton –S3
B10 value
100.000
Manufacturer’s data
Percentage of dangerous
failures
20 %
Manufacturer’s data
B
10d
value
500.000
B10
d
=
B10
percentage of dangerous failures
n
op
12 per year
assumed actuations per year
MTTF
d
416.666 years
→
high
MTTF
d
=
B
10d
0,1 x n
op
DC
99 %
Plausibility monitoring using –A1
Result
PFH
d
4,29 x 10
-8
/h
EN ISO 13849–1:2008, Anhang K
Performance Level
PLe
with Category 3
EVALUATE subsystem
In this example, the EVALUATE subsystem is implemented in the form of a SI-
RIUS 3TK3827 safety relay. The safety relay has instantaneous and delayed
electromechanical enable circuits.
Table 9-6
Parameters for the EVALUATE subsystem
Parameter
Value
Comment
Safety relay 3TK2827 –A1
PFH
d
2,7 x 10
-9
/h
Manufacturer’s data
Service life
T1 = 20 years
Manufacturer’s data
Instantaneous enable circuit
Performance Level
PLe
with Category 4
Delayed enable circuit
Performance Level
PLd
with Category 3
Result
PFH
d
2,7 x 10
-9
/h
PFH
d
= PFH
d
(–A1)
Performance Level
PLd
with Category 3
RESPOND subsystem
The RESPOND subsystem has a two channel structure. The first channel is
implemented using safety relay –K1. The line contactor in the line infeed forms
the second channel. Both channels are simultaneously controlled from safety
relay –A1. The positively opening NC contacts of the contactor and relay are
tested as feedback signal contacts by –A1 at each start.
9 Cabinet Design and EMC
02.12