[Nut-upsuser] Question about recycle power of Tripp Lite UPS

Shen Chuan shen at minutekey.com
Wed Jun 18 21:31:35 UTC 2014

Hello Charles,

Thank you for your comment. Just tried to use ups.delay.shutdown to
postpone the UPS shutdown. The thing is that if the PC shutdown first, then
the UPS, it wasn't able to send "shutdown.reboot" any more because
everything is power off after the UPS shuts down.

Also play on the watchdog for Tripp Lite. Looks like it has the command of
reset.watchdog but not enable.watchdog. Do you guys know the command to
enable the watchdog for Tripp Lite UPS(TrippLite HID 0.8)?

Thank you so much for your help


Minutekey Inc

On Wed, Jun 18, 2014 at 7:03 AM, Charles Lepple <clepple at gmail.com> wrote:

> [moving this to nut-upsuser, since other users of Tripp Lite equipment may
> have specific experience with this.]
> On Jun 17, 2014, at 7:51 PM, Shen Chuan <shen at minutekey.com> wrote:
> > We are trying to develop a mechanism to power cycle Tripp Lite UPS. When
> we checked the upscmd, looks like the only command we can use is
> shutdown.reboot(sudo upscmd -u user -p password ups shutdown.reboot).
> Because the PC is connected to UPS directly and we would prefer shutdown PC
> before power cycle the UPS. But if we run shutdown PC first it won't run
> the power cycle the UPS script any more. Wonder if there is a delaed power
> cycle command for Tripp Lite to give PC some time to shutdown itself?
> Attached the upscmd -l and upsc ups.
> ...
> > ups.delay.shutdown: 90
> ...
> > ups.timer.reboot: 65535
> > ups.timer.shutdown: 65535
> You should be able to set ups.delay.shutdown to the amount of time it
> takes the PC to shut down (plus a buffer), then send “shutdown.reboot” from
> the PC.
> You can monitor the ups.timer.* variables after sending the shutdown
> command; they should count down.
> There are some more details in the “Shutdown scripts” section of
> docs/config-notes.txt, or at
> http://www.networkupstools.org/docs/user-manual.chunked/ar01s06.html#_shutdown_scripts
> It also looks like your UPS has a watchdog. I haven’t tried this on the
> newer usbhid-ups models, but once you set the watchdog timer, the UPS will
> power-cycle the outlets if the driver does not communicate with the UPS in
> that timeout period.
> I am not sure if the watchdog is enabled after the reboot - this is
> definitely one of those cases where you will want to experiment with a
> dummy load on the UPS (and with the PC powered from another outlet).
> Does anyone else have any specific experience with these timers on a Tripp
> Lite UPS with usbhid-ups?
> --
> Charles Lepple
> clepple at gmail
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