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Back-UPS 800 always on battery even with AC power

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.

Solved
ML_apc
Cadet
0 Likes
1
92

Back-UPS 800 always on battery even with AC power

This was originally posted on APC forums on 3/28/2008


Back-UPS 800 flashes On-Line light and On-Battery light is on steady when powered ON. Finally settles On-Battery and green light goes out. AC power is steady and good. Load on the unit was about 200w or less. All load has now been removed and the unit acts the same. Reset switch hasn't/wasn't tripped. Battery was reported to be good by the PowerChute software and is about 1½ yrs old. We do have brief power outages and fluctuations here and it has always worked properly in the past. What's going on?


Accepted Solutions
TheNotoriousKMP_apc
Sisko
Sisko
0 Likes
0
92

Re: Back-UPS 800 always on battery even with AC power

This was originally posted on APC forums on 3/28/2008


Hello,

Have you adjusted the sensitivity through the software? The problem sounds like either the UPS isn't recognizing AC power, or there is excessive harmonic distortion (electrical noise) on the line that the UPS is currently unable to filter. By lowering the sensitivity, it should eliminate electrical noise as a problem. However, extremely excessive harmonic distortion is always a possibility, even with the sensitivity set to Low.

See Answer In Context

1 Reply 1
TheNotoriousKMP_apc
Sisko
Sisko
0 Likes
0
93

Re: Back-UPS 800 always on battery even with AC power

This was originally posted on APC forums on 3/28/2008


Hello,

Have you adjusted the sensitivity through the software? The problem sounds like either the UPS isn't recognizing AC power, or there is excessive harmonic distortion (electrical noise) on the line that the UPS is currently unable to filter. By lowering the sensitivity, it should eliminate electrical noise as a problem. However, extremely excessive harmonic distortion is always a possibility, even with the sensitivity set to Low.