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DC-UPS - 24V, 20 A, 480 W Reference Manual
Efficiency and Power
Losses
Lifetime Expectancy and
MTBF
18
Efficiency
Power Losses
Calculated lifetime expectancy
SN 29500, IEC 61709
(2)
MIL HDBK 217F
MTBF
MIL HDBK 217F
(1) The calculated lifetime expectancy 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 represents 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. An MTBF figure of for
example, 1 000 000h 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 000h or only for 100 h.
Rockwell Automation Publication 1606-RM008A-EN-P - November 2021
Power supply mode, 20 A output current, batteries fully
Typ
99%
charged
Power supply mode, 0 A output current, batteries fully
Typ
1.9 W
charged
Power supply mode, 0 A output current, during charging
Typ
4.8 W
batteries < 10 Ah
Power supply mode, 0 A output current, during charging
Typ
6.8 W
batteries > 10 Ah
Power supply mode, 20 A output current, batteries fully
Typ
4.6 W
charged
Typ
4.2 W
Battery mode, 0 A output current
Typ
7.6 W
Battery mode, 10 A output current
Typ
21.3 W
Battery mode, 20 A output current
440,000 h
Power supply mode, 10 A and 40 °C
1, 244,000 h
Power supply mode, 10 A and 25 °C
(1)
122,000 h
Power supply mode, 20 A and 40 °C
345,000 h
Power supply mode, 20 A and 25 °C
649,000 h
Power supply mode, 20 A and 40 °C
1,097,000 h
Power supply mode, 20 A and 25 °C
372,000 h
Power supply mode, 20 A and 40 °C; Ground Benign GB40
498,000 h
Power supply mode, 20 A and 25 °C; Ground Benign GB25
107,000 h
Power supply mode, 20 A and 40 °C; Ground Fixed GF40
137,000 h
Power supply mode, 20 A and 25 °C; Ground Fixed GF25
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