Eaton EMS2 Series - Page 53

7 Technical data
EMS2… Electronic motor starter 10/19 MN034003EN www.eaton.com 49
PFH
D
: (Probability of dangerous failure per hour) 4.2 FIT at 40 °C ambient temperature –
PFD
avg
(6 months / 36 months)
(Average Probability of Failure on Demand)
at 40 °C ambient temperature:
6 months: 1,37907 x 10
-5
36 months: 8,6235 x 10
-5
–
Safety level according to IEC 61508-1: to SIL 3
ISO 13849-1: to category 3 PL e
–
Motor protection
HFT (hardware fault tolerance) 0 –
Ambient temperature 40 °C - 60 °C –
MTTF (Mean Time to Failure)
67 years at 40 °C ambient temperature
MTTF
D
(Mean Time to Failure Dangerous) 169 years at 40 °C ambient temperature –
Shutdown time 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
–
λ
sd
– failure rate of detectable safe failures
(sd = safe, detectable)
0 FIT –
λ
su
– failure rate of undetectable safe failures
(su = safe, undetectable)
1027 FIT at 40 °C ambient temperature –
λ
dd
– failure rate of detectable dangerous failures
(dd = dangerous, detectable)
670 FIT at 40 °C ambient temperature –
λ
du
– failure rate of undetectable dangerous
failures (du = dangerous, undetectable)
5.4 FIT at 40 °C ambient temperature –
SFF (Safe Failure Fraction)
99.7 % at 40 °C ambient temperature –
DC (Diagnostic Coverage) 99.2 % at 40 °C ambient temperature –
PFD
avg
(6 months / 36 months)
(Average Probability of Failure on Demand)
at 40 °C ambient temperature:
6 months: 1,97487 x 10
-5
36 months: 12,1362 x 10
-5
–
Safety level according to IEC 61508-1: SIL 2 –
Size/feature EMS2-…-24VDC EMS2-…-230VAC