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Computer restarts when there is fluctuations in power supply

  1. #1
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    Default Computer restarts when there is fluctuations in power supply

    Dear all
    I have an inverter for my home and a ups for the computer as well but the cpu restarts when there is fluctuations in the power supply. This all starts in the summer due to bad power supply I think.

    I am very unhappy because of this. Can anybody provide me the solution for this. Also I want to let you people know that when I run cpu after switching off the main power then the CPU run ok.

    Thanks in advance

  2. #2
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    I don't know much about UPS and inverters, but I would suggest maybe connect the computer directly to an inverter socket without the UPS connection.

  3. #3
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    Quote Originally Posted by Someone007 View Post
    I don't know much about UPS and inverters, but I would suggest maybe connect the computer directly to an inverter socket without the UPS connection.
    Before buying ups I am using the CPU connecting directly with the Inverter. When the pc is restarting frequently then I purchased the ups but the problem still persists.

  4. #4
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    You need to get the UPS checked out, there maybe something wrong with the UPS itself.

    Sent from my 6043D using Tapatalk

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    In addition to the Inverter and UPS, there may be problems with the SMPS itself.
    SMPS power issues can cause mysterious errors and crashes. I myself faced this with a Zebronics one, and since I upgraded it to Corsair; I did not face any problems till now.

  6. #6
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    I used to have a german made desktop computer untill a few years ago and it had the same problem but I never bought a UPS. I got an iBall smps and that sorted this problem. I am also wondering which inverter do you have? Is it sinewave and have you got it checked for output recently?

    The only culprit seems to be the power unit in your box but that is just a feeling not something based on facts. More info on what inverter it is and the power rating would probably help in getting to a logical conclusion.

    I would also strongly advise not to use a UPS alongside an inverter. I was advised by our dear "mistrie" I dont know why though..

  7. #7
    Bronze Member HareKrishna's Avatar
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    Power supply units sold in India are better capable of taking power fluctuations. The ones sold in developed markets are not designed that way.

  8. #8
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    Maybe you should get your UPS changed, if its new then take it back to the shop.

  9. #9
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    1. Check Power Setting in control panel.
    2. SMPS required lot of power? check If your SMPS is working fine
    3. Maybe your UPS battery is weak

    You can also find some settings regarding power failure in BIOS or My Computer >> Properties >> and you need to Disable "Reboot on power-failure"

  10. #10
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    http://www.indiabroadband.net/attach...chmentid=12703

    Check this image.

    My Computer > Properties > Startup and recovery.
    Last edited by Admin; 16th September 2014 at 03:41 PM.

  11. #11
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    I had this problem around 5 years back, and the reason for the restart was a low end UPS. When I directly connected to the computer to a socket which was connected to the inverter I had no issues. In my opinion having a UPS is a waste of money, especially if you have a good battery inverter, if you dont then it is best to invest in a good UPS.
    nevinjohn likes this.

  12. #12
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    Get a dude with good enough knowledge of electronics to change out all the relays in your UPS to short throw (fast action) relays.
    As I see, you have 2-3 issues in your setup.
    1) Your UPS relay takes some time to fire, because of which the time taken for it to switch from mains to battery power is too long, and computer restarts.
    2) Your UPS battery might take too much time between zero load to full load. This happens with older batteries, (over 2-3 years). If yours is new, you are good.
    3) You are using an SMPS with a lower rating, and your system uses more than 90-95 of the wattage of the SMPS. This causes it to not handle sudden input voltage drops, or similar incidences.

    I have a 7 year old Microtek UPS, with a battery changed 3 years ago, and it is configured in the same way as yours, with an inverter. This one behaves properly, and the relays used in it are of the variety mentioned above. I used to simultaneously run a desktop, a laptop and a bsnl broadband modem + wifi router on this UPS, when I didn't have an inverter, and it still worked great. Just the power equation and relay action times are important.
    Admin and nevinjohn like this.

  13. #13
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    How long does the computer run on your Microtek UPS?

  14. #14
    Junior Member gspal's Avatar
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    Admin is right. I used to have this problem until I upgraded my SMPS from 400 VA to 600 VA. Also i do not use UPS. I have an APC 800 VA home inverter with a UPS switch and tall tubular 12v battery which I turn on when running my desktop computer which is connected to it. However, as a laser printer demands a lot of load, I have not connected the same to the APC inverter. In the house one would need to segregate the light (fans, CFL, etc.) from the power (AC/cooler, washing machine, geyser, fridge, TV) elect lines.
    Admin and pshrinivasan like this.

  15. #15
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    The fault is to be blamed on the low response time of the UPS.
    This response time is the time required by the relay (its a magnetic switch) to change over from mains AC line to battery power supply, expressed in ms (milliseconds). More can be found here
    http://forums.apc.com/spaces/4/back-...s-hold-up-time
    SmoothVibes likes this.

  16. #16
    Junior Member Damien Lee's Avatar
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    From my own experience, I'd advice on using inverters that are only intended for desktops or laptops. These are far more expensive than standard inverters but provide the cleanest source of electricity to your computer with very minimal spiking. I've noticed that inverters intended for computers are around 4 - 5 times more expensive than a standard model, at least when I do price comparisons in my country.

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