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.
T
M
(a)
CCF
HFT
SC
Cat.
DC
(%)
MTTF
D
(a)
PFD
avg
(T
1
= 5
a)
PFD
avg
(T
1
= 2
a)
PFH
(T
1
=
20 a)
(1/h)
SFF
(%)
PL
SIL/
SILCL
Frame
size
20
80
1
3
3
≥90
2569
1.67E-
04
6.68E-
05
8.00E-
09
>90
e
3
R0
20
80
1
3
3
≥90
2568
1.67E-
04
6.68E-
05
8.00E-
09
>90
e
3
R1
20
80
1
3
3
≥90
2568
1.67E-
04
6.68E-
05
8.00E-
09
>90
e
3
R2
20
80
1
3
3
≥90
2935
5.54E-
05
2.23E-
05
2.54E-
09
>99
e
3
R3
20
80
1
3
3
≥90
2932
5.55E-
05
2.23E-
05
2.54E-
09
>99
e
3
R4
20
80
1
3
3
≥90
2934
5.54E-
05
2.23E-
05
2.54E-
09
>99
e
3
R5
20
80
1
3
3
≥90
9380
8.58E-
05
3.44E-
05
3.92E-
09
>99
e
3
R6
20
80
1
3
3
≥90
9380
8.58E-
05
3.44E-
05
3.92E-
09
>99
e
3
R7
20
80
1
3
3
≥90
8792
8.84E-
05
3.69E-
05
4.22E-
09
>99
e
3
R8
3AXD10000320081 D, 3AXD10000015777 J
•
The following temperature profile is used in safety value calculations:
•
670 on/off cycles per year with Δ
T
= 71.66 °C
•
1340 on/off cycles per year with Δ
T
= 61.66 °C
•
30 on/off cycles per year with Δ
T
= 10.0 °C
•
32 °C board temperature at 2.0% of time
•
60 °C board temperature at 1.5% of time
•
85 °C board temperature at 2.3% of time.
•
Relevant failure modes:
•
The STO trips spuriously (safe failure)
•
The STO does not activate when requested
•
A fault exclusion on the failure mode “short circuit on printed circuit board” has been
made (EN 13849-2, table D.5). The analysis is based on an assumption that one
failure occurs at one time. No accumulated failures have been analyzed.
•
STO response times:
•
STO reaction time (shortest detectable break): 1 ms
•
STO response time:
-
Frames R0…R2: 5 ms (typical), 10 ms (maximum)
160 The Safe torque off function
Summary of Contents for ACQ80-04 Series
Page 1: ...ABB DRIVES FOR WATER ACQ80 04 drives 0 75 to 160 kW 1 0 to 215 hp Hardware manual...
Page 2: ......
Page 4: ......
Page 18: ...18...
Page 24: ...24...
Page 38: ...38...
Page 50: ...50...
Page 64: ...64...
Page 98: ...98...
Page 110: ...110...
Page 140: ...Frame R3 IP20 140 Dimension drawings...
Page 146: ...146...
Page 162: ...162...
Page 168: ......