[Nut-upsdev] Question about voltage threshold setting in NUT

Shen Chuan shen at minutekey.com
Wed Jun 4 22:38:58 UTC 2014

Hello Charles,

Thank you so much for your reply.

Yes. 40v was too low. In windows, those range started from 76v, 85v, and
96v. Just tried upsrw command to modify input.transfer.low and
input.transfer.boost.low. There were some error messages returned. Tried
another one battery.charge.low and it returns ok.

$  sudo upsrw -s input.transfer.low=70 -u * -p * ups
Unexpected response from upsd: ERR READONLY

$ sudo upsrw -s input.transfer.boost.low=70 -u * -p * ups
Unexpected response from upsd: ERR VAR-NOT-SUPPORTED

$ sudo upsrw -s battery.charge.low=70 -u * -p * ups

On Wed, Jun 4, 2014 at 3:48 PM, Charles Lepple <clepple at gmail.com> wrote:

> On Jun 3, 2014, at 5:16 PM, Shen Chuan wrote:
> > We have an Eaton 3S 550 UPS using NUT tool to send power loss event. By
> default the power voltage threshold is set to 85 volts. If the voltage is
> less than 85 volts, it will trigger ONBATT event from NUT. Is there a way
> in NUT we can change the threshold from 85 volts to a lower voltage like 40
> volts?
> It might be possible with upsrw - try modifying "input.transfer.low" and
> "input.transfer.boost.low".
> However, 40V to 110-120V is a long way to boost. Is this UPS rated for
> such a wide voltage range?
> You could also check for sensitivity settings. I don't know about the 3S
> in particular, but theoretically, usbhid-ups supports those sorts of
> settings.
> --
> Charles Lepple
> clepple at gmail
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