Rockwell Automation 1606-XLS240UPSD Power Supply Reference Manual - Manual (Page 16)

All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time unless noted otherwise.
It is assumed that the input power source can deliver a sufficient output current.
16 Rockwell Automation Publication 1606-RM017A-EN-P — February 2014
Bulletin 1606 Switched Mode Power Supplies
16. Reliability
Lifetime expectancy, normal mode min. 114 000 h At 10A output current, 40°C
min. 148 000 h At 5A output current, 40°C
min. 380 000 h At 10A output current, 25°C
MTBF SN 29500, IEC 61709, normal mode 788 000 h At 10A output current, 40°C
MTBF MIL HDBK 217F, normal mode 343 000 h At 10A output current , 40°C, ground benign GB40
The Lifetime expectancy shown in the table indicates the operating hours (service life) and is determined by the
lifetime expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified in operational hours.
Lifetime expectancy is calculated according to the capacitor’s manufacturer specification. The prediction model allows
a calculation of up to 15 years from date of shipment.
MTBF
stands for Mean Time Between Failures which is calculated according to statistical device failures and indicates
reliability of a device. It is the statistical representation of the likelihood of failure of a unit and does not necessarily
represent the life of a product.