This was originally posted on APC forums on 7/20/2016
I have an AP7721 for which both input powers sources comes from 2 UPS's, one is Smart-UPS SC 450VA (Source A) the other one is a very old Blazer 2000 (Source B). Default is Source A
In case of power outage the AP7721 switch over on Source B and display an alarm that switchover not possible anymore because "Fault exists on Source A"
The configuration of AP7721 is a follow:
By looking on Source Measurements the values for
Both devices AP7721 and Smart-UPS SC 450VA are brand new (2 month).
This scenario is reproducible in case of power outage.
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