AP7721, Fault exists on Source A where is connected Smart-UPS SC 450VA

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Hi,

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:

Frequency Deviation: 3
Voltage Transfer Range: wide
Sensitivity: low
Line VRMS: 230
Wide VRMS Limit: 35

By looking on Source Measurements the values for

Source A (the one with the fault) are:
- Input Frequency: 60 Hz
- Input Voltage: 243 VAC
Source B are:
- Input Frequency: 50 Hz
- Input Voltage: 223 VAC

Both devices AP7721 and Smart-UPS SC 450VA are brand new (2 month).

This scenario is reproducible in case of power outage.

Regards,

Ciprian

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