[Nut-upsuser] [EXTERNAL] Re: Tripp Lite SMART1500LCD will not stay shut down when power is disconnected

Layne Fowler layne.fowler at gmail.com
Wed Jan 15 05:47:01 GMT 2020

My serial # is 2835BY0SM886900639, model # SMART1500LCD.

Using stock nut, my UPS will turn back on after load off, even with no
power connected. Servers boot up and fail when the UPS finally dies.

Using my patched nut, the UPS will fail to turn on if the power returns
after the shutdown command but before actual load off.

It seems like this UPS is missing the "load.on" and/or "load.on.delay"
instant commands.

Thanks again David for offering your help. Let me know if I can give you
any other information you need.

On Tue, Jan 14, 2020 at 7:48 PM David Zomaya <David_Zomaya at tripplite.com>

> Thanks Ken.
> I'll plan to sit down and look up the protocol information over the next
> week or so and follow up.
> ------------------------------
> *From:* Ken Olum <kdo at cosmos.phy.tufts.edu>
> *Sent:* Tuesday, January 14, 2020 1:35:10 PM
> *To:* David Zomaya
> *Cc:* kdo at cosmos.phy.tufts.edu; layne.fowler at gmail.com;
> nut-upsuser at alioth-lists.debian.net
> *Subject:* [EXTERNAL] Re: [Nut-upsuser] Tripp Lite SMART1500LCD will not
> stay shut down when power is disconnected
> This is an EXTERNAL email.  Please take a moment and think before clicking
> any links or opening any attachments from this email.  If suspicious,
> please forward to ishelpdesk at tripplite.com for review.
> ______________________________________________________________________
> Hi, David.  Thanks for the offer of help.  I have BCPERS450 serial
> number 2701DVHBC809300177.  Unfortunately I'm about to go on a trip and
> will be away until the end of the month, so I don't have much time to
> discuss these things at the moment, but maybe Layne will have something
> to say.
> My understanding from when I was working on this a couple years ago is
> that the main problem in getting NUT working right with Tripp-Lite
> equipment is to understand the mappings of the various controls.  For
> example, we have ReportID: 0x15, which maps to
> UPS.OutletSystem.Outlet.DelayBeforeShutdown.  I think this mapping is
> given by the UPS.  NUT than maps this control to load.off.delay.  Is
> that mapping correct, i.e., does setting the control in the UPS do the
> function that NUT expects?
> More importantly, is there anything in the UPS that NUT should be
> mapping to load.on.delay?  It does not find such an object, so
> load.on.delay is not mapped, which was the original source of the
> problem.
> Incidentally, according to my old notes, when I ask my UPS to shut
> down in ten seconds by setting UPS.OutletSystem.Outlet.DelayBeforeShutdown,
> it shuts down even if the power comes back on during those ten seconds.
> This is the right behavior because once I send the command I shut down
> my system and it needs the power cycle to restart.  My understanding is
> that Layne's system does not do this, so there is some difference in
> configuration or between the different models.
> The only corner case affecting my system that I am aware of is this:
> suppose the line power comes back at the same time that my system has
> decided to shut down.  The UPS tries to notify the system that the power
> is back on, but it's too late and the system is already in the process of
> sending the UPS.OutletSystem.Outlet.DelayBeforeShutdown.  Having done
> so, the system thinks the UPS will shut off and so shuts down.  However,
> because the power was on by the time that UPS actually received the
> command, it does not in fact shut off.  Thus the system is shut down and
> never reboots.  I don't know how this case is supposed to be handled.
> Thanks again.
>                                         Ken
> ------------------------------
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