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362 The Safe torque off function

Safety data

The safety data for the Safe torque off function is given below.
Note: The safety data is calculated for redundant use, and does not apply if both STO
channels are not used.
SFF
Frame
SIL
PL
size
U
= 230 V
N
R1
3
e
>99
R2
3
e
>99
R3
3
e
>99
R4
3
e
>99
R5
3
e
>99
R6
R7
3
e
>99
R8
U
= 400 V
N
R1
3
e
>99
R2
R3
3
e
>99
R4
R4
3
e
>99
v2
R5
3
e
>99
R6
3
e
>99
R7
R8
3
e
>99
R9
U
= 600 V
N
R2
3
e
>99
R3
3
e
>99
R5
3
e
>99
R7
R8
3
e
>99
R9
The following temperature profile is used in safety value calculations:
670 on/off cycles per year with ΔT = 71.66 °C
1340 on/off cycles per year with ΔT = 61.66 °C
30 on/off cycles per year with ΔT = 10.0 °C
PFH
PFD avg
(T
= 20 a)
1
(%)
(T
1
(1/h)
2.79E-09
2.34E-05
2.79E-09
2.34E-05
2.59E-09
2.28E-05
2.59E-09
2.28E-05
3.94E-09
2.28E-05
3.92E-09
3.44E-05
2.55E-09
2.24E-05
2.62E-09
2.31E-05
2.59E-09
2.28E-05
2.59E-09
2.28E-05
3.92E-09
3.44E-05
4.22E-09
3.69E-05
2.67E-09
2.24E-05
2.61E-09
2.30E-05
2.59E-09
2.28E-05
4.25E-09
3.72E-05
PFD avg
MTTF D
(a)
= 2 a)
(T
= 5 a)
1
5.83E-05
2755
5.83E-05
2756
5.72E-05
2856
5.67E-05
2870
5.69E-05
2856
8.59E-05
9380
5.59E-05
2918
5.75E-05
2823
5.67E-05
2870
5.68E-05
2868
8.59E-05
9380
9.24E-05
8792
5.57E-05
2920
5.72E-05
2840
5.69E-05
2856
9.29E-05
6443
3AXD10000776787 A, 3AXD10000015777 P
DC
Cat.
SC
HFT
CCF
(%)
≥90
3
3
1
80
≥90
3
3
1
80
≥90
3
3
1
80
≥90
3
3
1
80
≥90
3
3
1
80
≥90
3
3
1
80
≥90
3
3
1
80
≥90
3
3
1
80
≥90
3
3
1
80
≥90
3
3
1
80
≥90
3
3
1
80
≥90
3
3
1
80
≥90
3
3
1
80
≥90
3
3
1
80
≥90
3
3
1
80
≥90
3
3
1
80
T M
(a)
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20
20

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