L1/L2/N/G is considered single phase, just 2 hots.
FWIW . . .
On November 11, 2024 7:28:59 PM EST, John Ackermann N8UR via Nut-upsuser
<[email protected]> wrote:
>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
>> <[email protected]> wrote:
>>
>> John Ackermann N8UR via Nut-upsuser
>> <[email protected]> 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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