Eaton EMS2 Series Manual page 53

Size/feature
PFH : (Probability of dangerous failure per hour)
D
PFD (6 months / 36 months)
avg
(Average Probability of Failure on Demand)
Safety level according to
Motor protection
HFT (hardware fault tolerance)
Ambient temperature
MTTF (Mean Time to Failure)
MTTF (Mean Time to Failure Dangerous)
D
Shutdown time
λ – failure rate of detectable safe failures
sd
(sd = safe, detectable)
λ – failure rate of undetectable safe failures
su
(su = safe, undetectable)
λ – failure rate of detectable dangerous failures
dd
(dd = dangerous, detectable)
λ – failure rate of undetectable dangerous
du
failures (du = dangerous, undetectable)
SFF (Safe Failure Fraction)
DC (Diagnostic Coverage)
PFD (6 months / 36 months)
avg
(Average Probability of Failure on Demand)
Safety level according to
EMS2-...-24VDC
4.2 FIT at 40 °C ambient temperature
at 40 °C ambient temperature:
6 months: 1,37907 x 10
36 months: 8,6235 x 10
IEC 61508-1: to SIL 3
ISO 13849-1: to category 3 PL e
0
40 °C - 60 °C
67 years at 40 °C ambient temperature
169 years at 40 °C ambient temperature
EMS2-D(R)OS(F)-...-3-24VDC:
according to class 10, IEC 60947
EMS2-D(R)OS(F)-...-9-24VDC:
according to class 10A, IEC 60947
0 FIT
1027 FIT at 40 °C ambient temperature
670 FIT at 40 °C ambient temperature
5.4 FIT at 40 °C ambient temperature
99.7 % at 40 °C ambient temperature
99.2 % at 40 °C ambient temperature
at 40 °C ambient temperature:
6 months: 1,97487 x 10
36 months: 12,1362 x 10
IEC 61508-1: SIL 2
EMS2... Electronic motor starter 10/19 MN034003EN www.eaton.com
EMS2-...-230VAC
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7 Technical data
49