206 Appendix: Safe Torque Off (STO)
Data related to safety standards
Safety data
Proof test interval (PTI) T
1
= 2 years.
Mean repair time MRT = 0 h (circuit boards are not intended to be repaired).
Mean time to restoration MTTR = 48 h (MRT plus time used to locate the failure).
Failure rates
Tested with:
• Control board build version:
3AXD100000451859 Rev.03.
• Power unit build version:
3AXD100000446920 Rev.03.
• Firmware build version: MicroFlex e190 Build 5850.1.34 and later.
Frame SIL /
SILCL
PL SFF
[%]
PFH
D
[1/h]
PFD
G
[1/h]
MTTF
d
[a]
DC
[%]
SC Cat. HFT CCF Lifetime
[a]
UEI 3 e 98.32% 3.04E-09 2.33E-05 13943 ≥90 3 3 1 80 20
Channel λ
sd
[FIT]
λ
su
[FIT]
λ
dd
[FIT]
λ
du
[FIT]
SFF
[%]
Total 209.2 225.0 0.7 7.4 98.3%
CHX 15.2 6.8 0.0 2.8 88.6%
CH1 191.0 217.8 0.7 4.6 98.9%
CH2 194.0 218.3 0.7 4.6 98.9%
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