[Nut-upsuser] Tripp-Lite SMART1500LCD: powers off with /etc/killpower...then powers back on...

[Tom Velozo]

Hi Everyone,

I recently bought a Tripp-Lite SMART1500LCD for my Linux Mint 19.3 machine,
connected via a USB cable. I installed Nut 2.7.4 from the Mint package
repository via sudo apt update && sudo apt install nut. Everything works
great: NUT issues low battery warning when it reaches the set low
battery point and then issues shutdown commands...computer shuts
down..then the UPS shuts down a few seconds after that (i hear a 'clunk'
noise from the outlets)...BUT...after the UPS has shut down, I hear
another clunk noise and the computer starts to power back on. Since the UPS
battery is about dead at this point, the computer starts to boot up only
till the UPS completely dies since its batteries are depleted.  This is
what is happening:

- Low Battery setpoint reached --> issue computer shutdown
- Shutdown commands sent --> computer starts shutting down
- At some point, /etc/killpower is sent before computer fully shuts down
- Computer shuts down
- A few seconds later, I hear a clunk in the UPS (UPS powers off... I used
a multimeter to verify no AC voltage on the UPS output outlets)
- Another few seconds later, I hear another clunk in the UPS --> computer
starts to power on --> AC voltage is present on the UPS output outlets
- A few seconds later the battery in the UPS depletes --> computer dies
while booting up

The computer BIOS is obviously set to turn back on when AC is restored.
What could be causing the UPS to turn back on after a few seconds of being
off ?? As testing, I grabbed my Linux laptop (a separate machine) and
installed Nut 2.7.4 via sudo apt install nut. I then manually issued the
command "sudo upsdrvctl shutdown". There is a big clunk noise and the UPS
immediately turns off its outlets...and after a few seconds there is a
clunk and the ups outlets are back on. I don't understand why the UPS is
not staying off when issuing the command /etc/killpower or via sudo
upsdrvctl shutdown.

ups.conf:

[Tripp_Lite]
driver = usbhid-ups
port = auto
pollinterval = 10
desc = "Tripp-Lite SMART1500LCD"
vendorid = 09ae
ignorelb
override.battery.charge.low = 10
----------------------------------------------------------------------------

nut.conf

MODE=standalone
 ----------------------------------------------------------------------------

upsd.users

[upsmon]
password = xxxxx
actions = SET
instcmds = ALL
upsmon master
 ----------------------------------------------------------------------------

upsmon.conf

RUN_AS_USER root
MONITOR Tripp_Lite at localhost 1 upsmon xxxxxx master
MINSUPPLIES 1
SHUTDOWNCMD "/sbin/shutdown -h +0"
POLLFREQ 5
POLLFREQALERT 5
HOSTSYNC 5
DEADTIME 15
POWERDOWNFLAG /etc/killpower
#
NOTIFYMSG ONLINE "UPS %s on line power"
NOTIFYMSG ONBATT "UPS %s on battery"
NOTIFYMSG LOWBATT "UPS %s battery is low"
NOTIFYMSG FSD "UPS %s: forced shutdown in progress"
NOTIFYMSG COMMOK "Communications with UPS %s established"
NOTIFYMSG COMMBAD "Communications with UPS %s lost"
NOTIFYMSG SHUTDOWN "Auto logout and shutdown proceeding"
NOTIFYMSG REPLBATT "UPS %s battery needs to be replaced"
NOTIFYMSG NOCOMM "UPS %s is unavailable"
NOTIFYMSG NOPARENT "upsmon parent process died - shutdown impossible"
#
NOTIFYFLAG ONBATT SYSLOG+WALL
NOTIFYFLAG ONLINE SYSLOG+WALL+EXEC
NOTIFYFLAG ONBATT SYSLOG+WALL+EXEC
NOTIFYFLAG COMMBAD SYSLOG+EXEC
NOTIFYFLAG COMMOK SYSLOG+EXEC
NOTIFYFLAG REPLBATT SYSLOG+WALL
NOTIFYFLAG FSD SYSLOG+WALL+EXEC
NOTIFYFLAG NOCOMM   SYSLOG+WALL
NOTIFYFLAG NOPARENT SYSLOG+WALL
#
RBWARNTIME 43200
NOCOMMWARNTIME 300
FINALDELAY 5
#
------------------------------------------------------------------------

Here is the output from "upsc Tripp_Lite"

Init SSL without certificate database
battery.charge: 100
battery.charge.low: 10
battery.runtime: 1692
battery.type: PbAC
battery.voltage: 26.3
battery.voltage.nominal: 24.0
device.mfr: Tripp Lite
device.model: Tripp Lite UPS
device.type: ups
driver.flag.ignorelb: enabled
driver.name: usbhid-ups
driver.parameter.pollfreq: 30
driver.parameter.pollinterval: 10
driver.parameter.port: auto
driver.parameter.synchronous: no
driver.parameter.vendorid: 09ae
driver.version: 2.7.4
driver.version.data: TrippLite HID 0.82
driver.version.internal: 0.41
input.frequency: 59.9
input.voltage: 119.0
input.voltage.nominal: 120
output.frequency.nominal: 60
output.voltage: 119.0
output.voltage.nominal: 120
ups.beeper.status: disabled
ups.delay.shutdown: 20
ups.load: 25
ups.mfr: Tripp Lite
ups.model: Tripp Lite UPS
ups.power: 0.0
ups.power.nominal: 1500
ups.productid: 2012
ups.status: OL
ups.timer.reboot: 65535
ups.timer.shutdown: 65535
ups.vendorid: 09ae
ups.watchdog.status: 0

-----------------------------------------------------
Thank you kindly,
Tom
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://alioth-lists.debian.net/pipermail/nut-upsuser/attachments/20200428/3f33a4ef/attachment.html>