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BN-1500 drops power for 1-2 seconds when AC restored?

APC UPS for Home and Office Forum

Schneider Electric support forum for our APC offers including Home Office UPS, Surge Protectors, UTS, software and services and associated products designed to share knowledge, installation, and configuration.


BN-1500 drops power for 1-2 seconds when AC restored?

I'm just now doing some testing of AC power fail, and my BN-1500 does a fine shutdown, including shutting down a Win 10 workstation on a 1 minute trigger.   

After 2-3 minutes of being off,  backup power is still going fine, I restore AC.  Then this happens: 

1.  surge outlets turn on

2. front panel continues to shows On Batt, minimal load (1 bar), batter is 3 of 4 bars, and 32 min power remaining (no indicator of AC yet)

3. Windows workstation is triggered and starts booting

4. about 10-20 seconds after AC restore, the BN-1500 front panel suddenly goes black for ~4 sec and all power outlets go off.

5. BN-1500 front panel comes back on, showing  On Line, minimal load, 4/5 battery bars, 121V.   

6. Windows starts rebooting again.  All other devices are in reboot after this power drop.


-->what's going on?   Why did BN-1500 drop power for 4 seconds after AC was restored?????

I have a video where I captured the front panel indicators!



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