User Manual

All parameters are specified at 24V, 2.5A, 230Vac input, 25ªC ambient and after a 5 minutes run-in time unless noted otherwise.
6 Rockwell Automation Publication 1606-RM009A-EN-P — February 2014
Bulletin 1606 Switched Mode Power Supplies
5. Life Expectancy and MTBF
The redundancy module has two input channels which are completely independent from each other. Each control
circuit, auxiliary voltage source, or other circuitry in the module are 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 separate circuits 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.
The redundancy module does not have electrolytic capacitors included. Therefore, the lifetime expectancy is extremely
high.
Input / output
current conditions
Input: 2x10A
Output: 20A
Input: 2x5A
Output: 10A
Lifetime expectancy *) min. 25 years 25 years at 24V and 40°C
min. 25 years 25 years at 24V and 25°C
MTBF **) SN 29500, IEC 61709 46 500 000h 55 700 000h at 24V 40°C
70 000 000h 84 000 000h at 24V 25°C
MTBF **) MIL HDBK 217F 36 200 000h 43 500 000h at 24Vand 40°C (Ground Benign GB40)
41 100 000h 49 300 000h at 24Vand 25°C (Ground Benign GB25)
*) The Lifetime expectancy shown in the table indicates the minimum operating hours (service life).
**) 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 can not be determined if the failed unit
has been running for 50 000h or only for 100h.