[Nut-upsuser] Interpreting data from 220V input APC UPS

[John Ackermann N8UR]

Thanks, Tim.  The unit was available with single as well as split phase 
output, and from the data I can find the input was single phase, though 
the input connector has L1/L2/N/G wires.  I'm digging through the MIB to 
see what the raw data looks like.

Thanks!
John
----

On 11/11/24 19:14, Tim Dawson wrote:
> Sounds pretty normal from what I see. It appears that this is *NOT* a 
> true 240v UPS, but rather one that provides two legs of 120v output from 
> two legs of 120 input, and what is seen as "L2" is actually neutral, and 
> the line names are reporting incorrectly. With that in mind, each leg in 
> should be 120v, as well as the outputs, which is exactly what you are 
> seeing.(The fact tht L1 to L3 is 240v really isn't relevant).
> 
> - Tim
> 
> 
> On November 11, 2024 6:56:51 PM EST, Greg Troxel via Nut-upsuser 
> <nut-upsuser at alioth-lists.debian.net> wrote:
> 
>     John Ackermann N8UR via Nut-upsuser
>     <nut-upsuser at alioth-lists.debian.net> writes:
> 
>         I am monitoring via the SNMP driver an APC SmartUPS that has split
>         phase (2L + neutral) 240V input and 120/120 volt outputs. The data
>         for the voltages is not what I'm expecting, and I am wondering how I
>         should interpret it.
> 
> 
>     Wow, that sounds kind of industrial. Model?
> 
>     Is the input an L14-20P? Or equivalent non-twistlock?
> 
>         Here is an example from upsc:
> 
>         input.L1-L2.voltage: 121
>         input.L2-L3.voltage: 120
>         input.voltage: 121.20
>         output.current: 5.90
>         output.L1-L2.voltage: 119
>         output.L1.current: 5.90
>         output.L2-L3.voltage: 119
>         output.L2.current: 1
> 
>         The "input.voltage" value doesn't reflect the 240 volts that is
>         actually being applied. To get that, would I combine the L1-L2 and
>         L2-L3 voltages?
> 
> 
>     I would address figuring this out as two steps. One is to see what the
>     device actually sends and what makes sense there. And then to see if
>     NUT is mapping or making synthetic.
> 
>     I find it odd for the neutral to be labeled L2, as it seems to be. I
>     would think there would be L1 and L2, both reported as phase-to-neutral.
>     You might see if there is confusion.
> 
>     odd for output.L2.current, vs L3, given that voltage seems to be L1/L3
>     vs L2.
> 
>     Probably the first voltage is mapped to just 'voltage' and probably it
>     would be better to use the L1/L3 voltage. Similar for output.voltage.
> 
>     output.current should probably be average if output.voltage is 240ish.
>     Or better yet
> 
>         Note that the "output.current" value matches the L1 output current,
>         ignoring the L2 current. Perhaps that is a clue that the overall
>         "input" and "output" values are not meaningful in this case?
> 
> 
>     yes, and they are perhaps mapped from something else?
> 
>         How should I interpret these values to know the actual input and
>         output voltages and currents?
> 
> 
>     You're going to need to put a meter on it and compare to the reports, I
>     suspect.
> 
>     First, see if you can get specs, and look at the snmp mib directly and
>     see what you can figure out. Turn up debugging/verbose in nut.
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