9
05.01
9.4 Application examples
9-364
©
Siemens AG 2012 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
Safety function, protective door
If the protective door is opened, the drive should be safely stopped and after a
safely monitored time, should be shut down.
In two–shift operation, the protective door is opened every 10 min. The plant is
operational from Monday to Friday. The number of actuations is as follows:
6
•
1/h
•
16 h/d
•
260d = 24960 per yearh.
–A2
–A3
–K4
–K6
–S4
–S5
–K3
–K1
–K5
–K2
–A1
–A1
–A1
Fig. 9-17
Block diagram of the safety function, protective door
Safety relay –A1 is used for the diagnostics of –K2, –K3 and –K5. It is not inclu-
ded in the calculation for the protective door safety function.
SENSE subsystem
The protective door is monitored using two independent position switches –S4
and –S5. Both position switches have a positively opening contact.
Table 9-11
Parameters for the SENSE subsystem
Parameter
Value
Comment
Position switches –S4 and –S5
B10 value
10.000.000
Manufacturer’s data
Percentage of
dangerous failures
20 %
Manufacturer’s data
B
10d
value
50.000.000
B10
d
=
B10
Percentage of dangerous failures
n
op
24960 per years
assumed actuations per year
MTTF
d
20.032 years,
capped to 100
years
MTTF
d
=
B
10d
0,1 x n
op
DC
99 %
Plausibility monitoring using –A2
Intermediate results, RESPOND (channels 1 and 2)
MTTF
d
(RESPOND)
100 years
→
high
MTTF
d
values for both channels were
capped at 100 years
→
it is not necessary
to symmetrize both channels
DC
avg
90 %
→
average
DC
avg
= DC (channel 1) = DC (channel 2)
Ergebnisse ERFASSEN
PFH
d
2,47 x 10
-8
/h
EN ISO 13849–1:2008, Annex K
Performance Level
PLe
with Category 4
Assumption
9 Cabinet Design and EMC
02.12