Rockwell Automation Publication 1606-RM055B-EN-P - February 2017
13
Basic Power Supply 5 A
Lifetime Expectancy and
Mean Time between Failure
(MTBF)
Functional Diagram
Figure 17 - Functional Diagram
Attribute
AC 100V
AC 120V
AC 230V
Notes
Lifetime
expectancy
(1)
181 000 h
194 000 h
219 000 h
at 24V, 2.5 A and 40 °C (104 °F)
511 000 h
548 000 h
621 000 h
at 24V, 2.5 A and 25 °C (77 °F)
66 000 h
68 000 h
83 000 h
at 24V, 5 A and 40 °C (104 °F)
188 000 h
193 000 h
234 000 h
at 24V, 5 A and 25 °C (77 °F)
MTBF
(2)
SN 29500,
IEC 61709
1 065 000 h
1 147 000 h
1 379 000 h
at 24V, 5 A and 40 °C (104 °F)
2 038 000 h
2 166 000 h
2 519 000 h
at 24V, 5 A and 25 °C (77 °F)
MIL HDBK
217 F
681 000 h
651 000 h
645 000 h
at 24V, 5 A and 40 °C (104 °F); Ground Benign GB40
872 000 h
842 000 h
839 000 h
at 24V, 5 A and 25 °C (77 °F); Ground Benign GB25
165 000 h
164 000 h
168 000 h
at 24V, 5 A and 40 °C(104 °F); Ground Fixed GF40
206 000 h
205 000 h
211 000 h
at 24V, 5 A and 25 °C (77 °F); Ground Fixed GF25
(1) The Lifetime expectancy that is shown in the table indicates the minimum operating hours (service life) and is determined by the
lifetime expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified in operational hours and is calculated
according to the capacitor’s manufacturer specification. The manufacturer of the electrolytic capacitors only guarantees a maximum
life of up to 15 years (131 400 h). Any number exceeding this value is a calculated theoretical lifetime which can be used to compare
devices.
(2) MTBF stands for Mean Time Between Failure, which is calculated according to statistical device failures, and indicates reliability of a
device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily represent the life of a product.
The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of for example, 1 000 000 h means
that statistically one unit fails every 100 hours if 10 000 units are installed in the field. However, it cannot be determined if the failed
unit has been running for 50 000 h or only for 100 h.
+
+
-
-
V
OUT
Input Fuse
&
Input Filter
Output
Voltage
Regulator
Power
Converter
Output
Filter
DC
ok
L
N
Output
Over-
Voltage
Protection
Input
Rectifier
&
Inrush
Limiter
(NTC)
DC-ok
Relay
DC-ok
Contact
115/230V
Auto
Select
