Nut upsdev - Jun 2014 - Question about voltage threshold setting in NUT

Hello,

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?

We were trying to change ups.conf to modify the output of upsc ..., but
looks like it never pickup the new settings.

Thank you so much for your help

Regards

Shen
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On 6/3/2014 2:16 PM, Shen Chuan wrote:
> Hello,
>
> 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?
>
Isn't that a setting configured into the UPS?  NUT is obtaining it from
the UPS, isn't it, not the other way around?

Ted
> We were trying to change ups.conf to modify the output of upsc ..., but
> looks like it never pickup the new settings.
>
> Thank you so much for your help
>
> Regards
>
> Shen
>
>
> _______________________________________________
> Nut-upsdev mailing list
> Nut-upsdev at lists.alioth.debian.org
> http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/nut-upsdev

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

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
OK




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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