-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Alvin Starr wrote: > A lot of UPSs switch from the mains to battery once the power drops > and that delay can be enough to cause some power supplies to lose > enough power to fail
If that happens then your UPS is broken. The whole point of a UPS is to supply *uninterruptable* power. Even the simplest pass-through UPSes I know about can switch from line to battery in the space of a single waveform (ie. within 1/60th of a second). Not much point in having a UPS if it makes all your equipment reboot when the power goes out. - --Bob. - -- Bob Jonkman <[email protected]> Phone: +1-519-635-9413 SOBAC Microcomputer Services http://sobac.com/sobac/ Software --- Office & Business Automation --- Consulting GnuPG Fngrprnt:04F7 742B 8F54 C40A E115 26C2 B912 89B0 D2CC E5EA On 2016-06-14 11:30 AM, Alvin Starr via talk wrote: > On 06/14/2016 11:23 AM, Russell Reiter via talk wrote: >> On 6/14/16, D. Hugh Redelmeier via talk <[email protected]> wrote: >>> We have a computer that started doing random and frequent >>> restarts on the weekend. We don't know why. >>> >>> Any suggestions? >> You don't mention whether or not the system is protected by UPS. >> >> I live in an area with somewhat spotty electrical service, an >> older building near the exhibition grounds. When they liven up >> the CNE grounds in the spring, I experience brown-outs quite >> often. >> >> Most recently the city has replaced the streetcar overhead wires >> and de-energized and re-energized the system, both times I had >> spontaneous reboots. One of the TTC engineers told me the new >> streetcars require more voltage and they are replacing the wires >> with heavier gauge ones throughout the city. >> >> Are you near streetcar tracks where they may be replacing wiring >> or perhaps near one of the transformers which convert AC to DC? >> >> >> > As a note I have been burned by lower cost UPSs and heavily loaded > servers with no hold time in the power supplies. > > A lot of UPSs switch from the mains to battery once the power drops > and that delay can be enough to cause some power supplies to lose > enough power to fail. > > > > > --- Talk Mailing List [email protected] > https://gtalug.org/mailman/listinfo/talk > -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 Comment: Ensure confidentiality, authenticity, non-repudiability iEYEARECAAYFAldgvFEACgkQuRKJsNLM5erSEwCg3PnO/5iU8lYrurCDINP2U4Jq 09QAn0AesJQAetDdBp+K1MLlRAXFt5w8 =WWQC -----END PGP SIGNATURE----- --- Talk Mailing List [email protected] https://gtalug.org/mailman/listinfo/talk
