Hello, I am a new user of NUT and trying to wrap my ahead around a couple of things. I installed NUT 2.7.4-13 from package on RasPi 4, running Raspbian Linux 11 (bullseye). I have Cyberpower SL700U connected to it. For testing I set battery.charge.low to 90, so I wouldn't have to wait a long time. See all relevant config below.
First of all, what seems to happen is that UPS gets to the low battery state and the system immediately goes into the shutdown, not letting the 30s timer specified in upssched.conf fire. Here's the syslog: Feb 21 20:54:11 berry upsmon[1462]: UPS cyberpower@localhost battery is low Feb 21 20:54:11 berry upsd[1459]: Client monserver@127.0.0.1 set FSD on UPS [cyberpower] Feb 21 20:54:11 berry upssched[1712]: New timer: shutdowncritical (30 seconds) Feb 21 20:54:19 berry upsmon[1462]: Executing automatic power-fail shutdown Feb 21 20:54:19 berry upsmon[1462]: Auto logout and shutdown proceeding Then, I connected the UPS to wall power and reset power on RasPi. After boot-up it seemed to see low battery state (even though on wall power) and fired off the 'shutdowncritical' timer, which after 30 seconds, issued the FSD command and the system shut down again. Feb 21 20:54:55 berry upsmon[758]: Startup successful Feb 21 20:54:55 berry upsmon[759]: Init SSL without certificate database Feb 21 20:54:55 berry upsd[756]: User monserver@127.0.0.1 logged into UPS [cyberpower] Feb 21 20:54:55 berry upsmon[759]: UPS cyberpower@localhost battery is low Feb 21 20:54:55 berry upssched[766]: Timer daemon started Feb 21 20:54:55 berry upssched[766]: New timer: shutdowncritical (30 seconds) Feb 21 20:54:56 berry upsd[756]: User monclient@192.168.11.180 logged into UPS [cyberpower] Feb 21 20:55:25 berry upssched[766]: Event: shutdowncritical Feb 21 20:55:25 berry upssched-cmd[793]: Calling upssched-cmd shutdowncritical Feb 21 20:55:25 berry upsmon[759]: Signal 10: User requested FSD Feb 21 20:55:25 berry upsd[756]: Client monserver@127.0.0.1 set FSD on UPS [cyberpower] Feb 21 20:55:27 berry upssched-cmd[800]: UPS battery critically low, forced shutdown. [OL CHRG LB]:82% Feb 21 20:55:31 berry upsmon[759]: Executing automatic power-fail shutdown Feb 21 20:55:31 berry upsmon[759]: Auto logout and shutdown proceeding Feb 21 20:55:36 berry upsd[756]: mainloop: Interrupted system call Feb 21 20:55:36 berry upsd[756]: Signal 15: exiting How come it reacts to the LB state when the UPS is on wall power? I know I manually reset the power on the RasPi, but wouldn't the same happen if UPS was shut off and then regained power? Do I need to modify my upssched-cmd script to not react to LOWBATT timer unless the UPS is in OB state too? And finally, why is this sequence of log events different from the first one, where the timer didn't even fire, but the upsmon set FSD? ups.conf: [cyberpower] driver = usbhid-ups port = auto desc = "CyberPower SL700U" vendorid = 0764 productid = 0501 offdelay = 60 ondelay = 70 ignorelb override.battery.charge.low = 90 override.battery.charge.warning = 95 override.battery.runtime.low = 1000 This is the relevant output of upsc: battery.charge: 100 battery.charge.low: 90 battery.charge.warning: 95 battery.runtime: 2470 battery.runtime.low: 1000 driver.flag.ignorelb: enabled driver.name: usbhid-ups driver.parameter.offdelay: 60 driver.parameter.ondelay: 70 driver.parameter.pollfreq: 30 driver.parameter.pollinterval: 5 driver.parameter.port: auto driver.parameter.productid: 0501 driver.parameter.synchronous: no driver.parameter.vendorid: 0764 driver.version: 2.7.4 driver.version.data: CyberPower HID 0.4 driver.version.internal: 0.41 ups.beeper.status: enabled ups.delay.shutdown: 60 ups.delay.start: 70 ups.load: 14 ups.mfr: CPS ups.model: ST Series ups.realpower.nominal: 375 ups.timer.shutdown: -60 ups.timer.start: -60 upsmon.conf excerpts: RUN_AS_USER root MONITOR cyberpower@localhost 1 monserver sekret master MINSUPPLIES 1 SHUTDOWNCMD "/sbin/shutdown -h +0" NOTIFYCMD /sbin/upssched POLLFREQ 5 POLLFREQALERT 5 DEADTIME 15 POWERDOWNFLAG /etc/nut/killpower ... RBWARNTIME 43200 NOCOMMWARNTIME 300 FINALDELAY 5 upssched.conf excerpt: AT LOWBATT cyberpower@localhost START-TIMER shutdowncritical 30 AT ONLINE cyberpower@localhost CANCEL-TIMER shutdowncritical and then upssched-cmd basically does: case $1 in ... shutdowncritical) MSG="UPS battery critically low, forced shutdown. $CHMSG" /sbin/upsmon -c fsd ;; ...
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