Abbreviations - ABB ACS560 Hardware Manual

• 30 on/off cycles per year with ΔT = 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.
• The STO is a type A safety component as defined in IEC 61508-2.
• 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 reaction time (shortest detectable break): 1 ms
• STO response time: 2 ms (typical), 5 ms (maximum)
• Fault detection time: Channels in different states for longer than 200 ms
• Fault reaction time: Fault detection time + 10 ms
• STO fault indication (parameter 31.22) delay: < 500 ms
• STO warning indication (parameter 31.22) delay: < 1000 ms
• Maximum cable length 300 m (984 ft) between activation switch (K) and drive control
board.
• The voltage at the INx terminals of each drive must be at least 13 V DC to be interpreted
as "1". Pulse tolerance of input channels is 1 ms.

Abbreviations

Abbr. Reference
CCF EN ISO 13849-1
DC EN ISO 13849-1
FIT IEC 61508
HFT IEC 61508
MTTFd EN ISO 13849-1
PFD IEC 61508
PFHD IEC 61508
PL EN ISO 13849-1
SC IEC 61508
SFF IEC 61508
SIL IEC 61508
SILCL EN 62061
STO IEC/EN 61800-5-2
T1 IEC 61508
Description
Common cause failure (%)
Diagnostic coverage
Failure in time: 1E-9 hours
Hardware fault tolerance
Mean time to dangerous failure: (The total number of life units) / (the
number of dangerous, undetected failures) during a particular measure-
ment interval under stated conditions
Probability of failure on demand
Probability of dangerous failures per hour
Performance level. Levels a...e correspond to SIL
Systematic capability
Safe failure fraction (%)
Safety integrity level (1...3)
Maximum SIL (level 1...3) that can be claimed for a safety function or
subsystem
Safe torque off
Proof test interval
Safe torque off function 157