Depends on one's need. I would like my system to stay up if one grid lost
power but the other was OK (not running on battery). Some people might want
to start a shutdown when only one of them fails. The Arduino path is what i
meant when i said a tinkerer is the best choice to implement this, i'm 26
but i would've done it with logic gates, even simpler (less points of
failure, unless you want TCPIP monitoring, which an arduino can give you).

On Wed, Dec 11, 2013 at 5:32 PM, DrFranken <midrange@xxxxxxxxxxxx> wrote:

Would you want the system to power down if only one UPS lost grid power?
Would you want the system to power down if BOTH UPS lost input power?

Looking to understand the logic in the magic box because an Arduino
could do this very very easily.

- Larry "DrFranken" Bolhuis

On 12/11/2013 2:07 PM, Jerry Draper wrote:

We have an 8202-E4D with redundant power supplies (2 AC).

Mgmt wants to connect each AC to a different UPS for UPS redundancy.

We only have one port for the RJ45 UPS sensor cable (P1-T2).

IBM suggested that we could build a box with two RJ45 in and one RJ45
out (or two DB9 to one DB9) that would detect UPS status from either UPS
and send one signal to the IBMi.

Anyone have this box or know where to get one?



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