Reference Manual

All parameters are specified at 24V, 80A output current, 25ªC ambient and after a 5 minutes run-in time, unless noted otherwise.
6 Rockwell Automation Publication 1606-RM011A-EN-P — February 2014
Bulletin 1606 Switched Mode Power Supplies
5. Lifetime Expectancy and MTBF
The redundancy module has two input channels completely independent from each other. Each control circuit,
auxiliary voltage source, or other circuitry is designed separately for each input. The dual input redundancy module
can be considered as two single redundancy modules combined together in one housing. The only common point
is the circuit trace that ties the two distinct sicruits together at the output.
The MTBF gures below are for the entire dual input module. If the MTBF number of only one path is needed, simply
double the value from the table.
Input / output current
conditions
Input: 2x20A
Output: 40A
Input: 2x40A
Output: 80A
Lifetime expectancy
*)
513 000h
*)
143 000h
*)
at 24V and 40°C
1 450 000h
*)
405 000h
*)
at 24V and 25°C
MTBF
**)
SN 29500, IEC 61709 2 673 000h 2 088 000h at 24V 40°C
4 544 000h 3 669 000h at 24V 25°C
MTBF
**)
MIL HDBK 217F 100 000h 89 000h Ground Fixed GF40 (24V and 40°C)
133 000h 117 000h Ground Fixed GF25 (24V and 25°C)
536 000h 478 000h Ground Benign GB40 (24V and 40°C)
707 000h 628 000h Ground Benign GB25 (24V and 25°C)
*) The 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 specied in operational hours and is calculated according to the
capacitor’s manufacturer specication. The manufacturer of the electrolytic capacitors only guarantees a maximum life of up to 15 years
(131 400h). Any number exceeding this value is a calculated theoretical lifetime which can be used to compare devices.
**) 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 gure is a statistical representation of the likelihood of a device to fail. A MTBF gure of e.g. 1 000 000h means that
statistically one unit will fail every 100 hours if 10 000 units are installed in the eld. However, it cannot be determined if the failed unit
has been running for 50 000h or only for 100h.