430 Appendix: Safe torque off (STO)
Abbreviations
Declaration of conformity
Declaration of conformity (3AXD10000414701) is available on the Internet. See
section
Document library on the Internet
on the inside of the back cover.
Certificate
TÜV certificate (3AXD00000600767) is available on the Internet. See section
Document library on the Internet
on the inside of the back cover.
Abbreviation
Reference
Description
CCF
EN ISO 13849-1
Common cause failure (%)
DC
EN ISO 13849-1
Diagnostic coverage
HFT
IEC 61508
Hardware fault tolerance
MTTF
d
EN ISO 13849-1
Mean time to dangerous failure: (The total number of life
units) / (the number of dangerous, undetected failures)
during a particular measurement interval under stated
conditions
PFD
IEC 61508
Probability of failure on demand
PFH
IEC 61508
Probability of dangerous failures per hour
PL
EN ISO 13849-1
Performance level. Levels a…e correspond to SIL
SC
IEC 61508
Systematic capability
SFF
IEC 61508
Safe failure fraction (%)
SIL
IEC 61508
Safety integrity level (1…3)
SILCL
EN 62061
Maximum SIL (level 1…3) that can be claimed for a safety
function or subsystem
STO
IEC/EN 61800-5-2 Safe torque off
T1
IEC 61508
Proof test interval. T1 is a parameter used to define the
probabilistic failure rate (PFH or PFD) for the safety
function or subsystem. Performing a proof test at a
maximum interval of T1 is required to keep the SIL
capability valid. The same interval must be followed to keep
the PL capability (EN ISO 13849) valid. Note that any T1
values given cannot be regarded as a guarantee or
warranty.
See also section
).
Summary of Contents for ACS355 series
Page 1: ...ABB machinery drives User s manual ACS355 drives ...
Page 4: ......
Page 16: ...16 ...
Page 32: ...32 Operation principle and hardware description ...
Page 58: ...58 Electrical installation ...
Page 74: ...74 Start up control with I O and ID run ...
Page 106: ...106 Control panels ...
Page 120: ...120 Application macros ...
Page 178: ...178 Program features ...
Page 338: ...338 Fieldbus control with embedded fieldbus ...
Page 368: ...368 Fault tracing ...
Page 404: ...404 Dimension drawings ...
Page 410: ...410 Appendix Resistor braking ...
Page 434: ...434 Appendix Permanent magnet synchronous motors PMSMs ...