JVL MIS17 Series User Manual page 74

3.4
The following temperature profile is used in safety value calculations:
• 1000 on/off cycles per year with T = 85 °C
• 85 °C board temperature at 100 % of time.
• The STO is a type A safety component as defined in IEC 61508-2.
• Relevant failure modes:
1. The STO trips spuriously (safe failure)
2. The STO does not activate when requested
The analysis is based on an assumption that one failure occurs at one time. No accumu-
lated failures have been analyzed. The conclusion gives that no single dangerous failures
can remain undetected, and therefore the motor will always go to safe state in case of
one dangerous failure at a time.
• Reaction times are described in section STO function activation and indication re-
sponse times in the table above.
74 JVL Industri Elektronik A/S - User Manual - Integrated Stepper Motors MIS17x, 23x, 34x, 43x
Commissioning
Option