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
14729
9.15E-05
3.66E-05
4.18E-09
99.55
e
3
R10
R11
3AXD10000410558 E
•
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: 2 ms (typical), 30 ms (maximum)
•
Fault detection time: Channels in different states for longer than 200 ms
•
Fault reaction time: Fault detection time + 10 ms
•
Indication delays:
•
STO fault indication (parameter
31.22
) delay: < 500 ms
•
STO warning indication (parameter
31.22
) delay: < 1000 ms
■
Abbreviations
Description
Reference
Abbr.
Classification of the safety-related parts of a control system in respect
of their resistance to faults and their subsequent behavior in the fault
condition, and which is achieved by the structural arrangement of the
parts, fault detection and/or by their reliability. The categories are: B,
1, 2, 3 and 4.
EN ISO 13849-1
Cat.
Common cause failure (%)
EN ISO 13849-1
CCF
Diagnostic coverage
EN ISO 13849-1
DC
Hardware fault tolerance
IEC 61508
HFT
Mean time to dangerous failure: (Total number of life units) / (Number
of dangerous, undetected failures) during a particular measurement
interval under stated conditions
EN ISO 13849-1
MTTF
D
184 The Safe torque off function
Summary of Contents for ACH580-04
Page 1: ... ABB DRIVES FOR HVAC ACH580 04 drive modules Hardware manual ...
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Page 128: ...3 6 5 5 128 Maintenance ...
Page 134: ...134 ...
Page 156: ...R10 standard configuration 156 Dimension drawings ...
Page 157: ...R10 with E208 0H354 H356 H370 0H371 Dimension drawings 157 ...
Page 158: ...R10 with option B051 158 Dimension drawings ...
Page 159: ...R10 with option E208 H356 P906 192 Tools R10 3 1 Dimension drawings 159 ...
Page 160: ...R10 with option E208 0H371 H356 0H354 H370 P906 Tools 191 R10 2 1 160 Dimension drawings ...
Page 161: ...R10 with option B051 P906 190 Tools R10 1 1 Dimension drawings 161 ...
Page 162: ...R11 standard configuration 162 Dimension drawings ...
Page 163: ...R11 with option E208 0H371 H356 0H354 H370 Dimension drawings 163 ...
Page 164: ...R11 with option B051 164 Dimension drawings ...
Page 165: ...R11 with option E208 H356 P906 Dimension drawings 165 ...
Page 166: ...R11 with option E208 0H371 H356 0H354 H370 P906 166 Dimension drawings ...
Page 167: ...R11 with option B051 P906 Dimension drawings 167 ...
Page 186: ... Declaration of conformity 186 The Safe torque off function ...
Page 206: ...Dimension drawing 206 External control unit option P906 ...
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