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ES750 very strange behavior with power fail ??

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
Davec33_apc
Cadet
0 Likes
4
200

ES750 very strange behavior with power fail ??

This was originally posted on APC forums on 6/24/2012


I have ES750 running with PowerChute Personal Edition 3.0.2 and Windows 7.

My computer is set to go to sleep (probably Hybrid Sleep) after 2 hours.
Now if there is a power failure while the computer is asleep the UPS never shuts the system off, or makes any beeping sounds.
The computer is asleep (power switch is lit orange) and monitor is on standby mode.
If power returns after a short time, then no problem. But if the power failure is long then the battery will run down.

In the second scenario, the computer is on and operating normally.
There is a power failure, and after the preset time (5 minutes) the box pops up to say the computer will hibernate, and after a short time computer shuts off completely. Power is then restored some time later, and of course the computer is off. Press power button on computer - then shows something like "Resuming Windows", and then SHUTS OFF !! Start the computer again and I get a screen that gives me 2 options - I think one is to Resume and the other is to delete the resume storage and start Windows.

Can anyone give me any clues how to make the system shut down and start up properly ?


Accepted Solutions
voidstar_apc
Janeway
Janeway
0 Likes
0
200

Re: ES750 very strange behavior with power fail ??

This was originally posted on APC forums on 7/15/2012


>
It's not clear to me how cutting power to a computer aligns with the function of a UPS.
>

If the UPS didn't cut the power, the computer wouldn't notice a power failure and therefore remain off until someone manually turns it back on. So the sequence of events is this:

1) The UPS notifies PowerChute that there is a power failure.
2) PowerChute, at some point, decides to shut down the computer.
3) PowerChute tells the UPS to give it a certain amount of time (say, 5 minutes) to shut down

At this point, the UPS must shut down regardless of whether power comes back.

4) After waiting for the computer to shut down, the UPS shuts down
5) If and when AC power becomes available, the UPS turns back on.

>
Is there a way to edit or turn off this functionality?
>

There are ways of omitting step 3, however that means the UPS would keep running on battery. I think the easiest thing to do here is enable "Turn on after power failure" in the BIOS and let the UPS turn the computer back on after the power failure.

See Answer In Context

4 Replies 4
Davec33_apc
Cadet
0 Likes
0
200

Re: ES750 very strange behavior with power fail ??

This was originally posted on APC forums on 6/27/2012


I have been doing some testing and I think have solved my problems.

First the UPS must be able to wake the computer from sleep mode.
Device Manager -> Batteries -> APC UPS -> Power Management Tab , check "Allow this device to wake the computer".
This fixed the first part of my problem.
Now if the computer is asleep when the power failure occurs, the UPS wakes the computer and then after the preset time goes into hibernation.

The second part of my problem where the computer would start to resume and then suddenly shut off is because I did not wait long enough before restoring power to the UPS.
If I wait for a few minutes after shut down of the computer then I hear a click from the UPS and then after restoring power the computer can be turned on again without problems.

voidstar_apc
Janeway
Janeway
0 Likes
0
200

Re: ES750 very strange behavior with power fail ??

This was originally posted on APC forums on 6/27/2012


You may want to set the computer's BIOS to turn the computer on after a power outage. The UPS cuts power to the computer briefly to turn it back on.

Dougga_apc
Ensign
Ensign
0 Likes
0
198

Re: ES750 very strange behavior with power fail ??

This was originally posted on APC forums on 7/13/2012


I'm very interested in the following statement:

"The UPS cuts power to the computer briefly to turn it back on."

I'm finding that my UPS cuts power to all devices for about 1.5 seconds when a power fault occurs.
You can see my thread near the top of the list currently.
It's not clear to me how cutting power to a computer aligns with the function of a UPS.

Is there a way to edit or turn off this functionality? I think this may be defeating the usefulness of the UPS altogether.

voidstar_apc
Janeway
Janeway
0 Likes
0
201

Re: ES750 very strange behavior with power fail ??

This was originally posted on APC forums on 7/15/2012


>
It's not clear to me how cutting power to a computer aligns with the function of a UPS.
>

If the UPS didn't cut the power, the computer wouldn't notice a power failure and therefore remain off until someone manually turns it back on. So the sequence of events is this:

1) The UPS notifies PowerChute that there is a power failure.
2) PowerChute, at some point, decides to shut down the computer.
3) PowerChute tells the UPS to give it a certain amount of time (say, 5 minutes) to shut down

At this point, the UPS must shut down regardless of whether power comes back.

4) After waiting for the computer to shut down, the UPS shuts down
5) If and when AC power becomes available, the UPS turns back on.

>
Is there a way to edit or turn off this functionality?
>

There are ways of omitting step 3, however that means the UPS would keep running on battery. I think the easiest thing to do here is enable "Turn on after power failure" in the BIOS and let the UPS turn the computer back on after the power failure.