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System Restart Problem

By phuntiji ·
All my PCs are connected to UPS. If I disconnect the UPS from main power supply, it provide supply to the PC from the battery. But when when electricity goes, some of the PCs gets restarts. This happen only when the electricity goes. I have already changed the power supply many times, also changed the position of PC. But the problem still persists.
P4 2.8GHz, Intel original 865GBF Motherboard, CDROM, 80GB HDD, 1.44 MB Floppy Drive, LAN Card.
Thanks in anticipation.

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by joshua.phillips@blueyonde In reply to System Restart Problem

I encountered a similar problem before when the loading on the UPS was close to/above the rated limit (i.e. too many pc's on the UPS unit). Overloading the UPS may cause a drop in power levels enough to trigger the pc to re-boot.
Check & double check the power ratings.
Test one pc at a time on the UPS disconnecting the mains power, and see if the problem occurs with a single pc. Gradually add more pc's until the problem occurs. (Note: it may be a good idea to create a few DOS boot floppies for this exercise - as re-starting/booting from floppy will be quicker that to h/d.)

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by phuntiji In reply to

Poster rated this answer.
Only one PC get restarted each time. Other PC keep on running. Otherwise overloading can cause different PC to restart. I had 6 UPS and 2-3 systems, each connected to different UPS are facing the problem. I had already changed positions few times.

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by RCOM In reply to System Restart Problem

Make sure to let the UPS completely charge before using it. Also as mentioned if its overloaded it will not be able to supply enough power to stand the first few seconds after the power goes out. That's probably why some of systems reboots. To help stop this get more UPS devices or at least lessen the load maybe connect all but the main system's monitor to a seperate power source. Never connect things like laser printers to the UPS.

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by phuntiji In reply to

Poster rated this answer.
Only one PC get restarted each time. Other PC keep on running. Otherwise overloading can cause different PC to restart. I had 6 UPS and 2-3 systems, each connected to different UPS are facing the problem. I had already changed positions few times.

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