Camera resets when powered from UPS

[ironton]

I am not a frequent poster but check the board daily to see what I might learn.  I am hoping someone can help with this issue. 
 
I have 4 webcams; two are USB types and two are wired network cameras.  One of the network cameras (a D-link DCS-1000) has been powered from a UPS for a few years; the other (a Hawking HNC300) was powered from a normal outlet.  Both network cameras have been in use for several years in their respective locations. 

I use the internal FTP option for both network cameras to send images to my webpage every 10 minutes from 6am to 10pm.  I also have webcam software that sends these images to a separate page.  This set up has worked for some time. 

Recently I added a UPS for the other network camera so that power interruptions would not reset the network camera.  The first day that camera was powered from the new UPS it began to reset the image counter at random times in the day back to image #1.  This spoils the daily image history for my 6am to 10pm webpage. 

Over the course of the past 10 days I have tried to find the cause of the camera resets.  I tried a second UPS with the same result.  If I plug the camera back into a normal outlet, it works without any resets.  I have made these changes from UPS power to standard outlet power multiple times with the same result.

I am stumped why the camera would reset while powered from a UPS units.

Anyone with similar experience?  suggestions?

The webcam that resets is on this page:
http://irontonwebcams.com/c/d/dt.htm
You can go back a few days and see the image stream was interrupted.

The camera that has been on a UPS is on this page:
http://irontonwebcams.com/c/n/nt.htm
-ed /ironton

[Bushman]

My suspicion is that the UPS isn't switching fast enough for the camera

[ironton]

Thanks for the quick reply.
I have not had any power interruptions - or are you referring to something else (- power output quality?). 
I also reduced the UPS sensitivity to the lowest setting with no success.
-ed

[Bushman]

Even a short brown out (or surge) can trigger your UPS.

[Cienega32]

Have you tried a non-switched outlet on the UPS (if it has one)?

[ironton]

Even a short brown out (or surge) can trigger your UPS.

That could be the cause especially if it was just that one circuit.  None of my other UPS units beeped (I have a few ) during that time (I was here most days).  So, maybe I need to investigate the circuit.
The UPS voltage sensitivity was adjusted from 96-136 to 88-142 on my last try. 

Have you tried a non-switched outlet on the UPS (if it has one)?

No, good idea.  That might narrow it down - but then I want the back-up. 

[Lefty]

If this is a brand new UPS (to you, at least), check the UPS's self-check settings. Years ago when I worked in a data center, we would get UPSs that would self-check by briefly switching over to UPS load then back to normal power. Depending upon the sensitivity of the server and UPS combo, we'd get the occasional server shutdown page-out (funny how they always happened in the middle of the night).

In any case, if your UPS is doing the same self-check, it might be interrupting the camera's power just enough during the switch-over to reset it.

[ironton]

If this is a brand new UPS (to you, at least),

Yes, the UPS was new out of the box.  But, after today, I concluded it is not the UPS.  Today it was plugged into an outlet /no UPS and the camera reset.  (Each other time it reset it was plugged into a UPS.)
Must be the camera just got tired /old and the UPS is a coincidence in timing.   It has been running for years so it owes me nothing.  Aside form the internal software it still works fine.  Time to do some shopping for an upgrade, I guess.

I appreciate all the comments and suggestions. 
I learn a lot from this board - but have a lot more to learn.
-ed /ironton