Of course I meant the US, I know that it is 120 V in the US, and I write it that way in many postings, but the mainly North American forum users here keep talking of 110 V persistently, so I think that it is customary in the U.S. to think they have 110 V.
Should I better write “120 V country”? Would U.S. citizen know that I meant them? VFD manufacturers speak of “100 V class”, maybe I should write it that way. I just mentioned that because actually I was referring to the fact that in North America, for 120 V they have NEMA 5-15, 5-20 and 5-30 outlets and circuits with the corresponding current ratings and fuses (max. 30 A), and for a 100 V class VFD with 2.2 kW output, which can suck more than 4.5 kVA at its input on single-phase, 30 A are not enough, and the missing input current rating on the nameplate of these VFDs lets the users in the dark regarding that information.
I have seen in Huanyang VFD manuals that they write you can run these VFDs with one phase at its input connected, OR three phases connected [Huanyang VFD Manual].
I don’t know where you could find 110 V three phase, no North American forum user here ever reported they had three-phase electricity in their homes anyway, but in North America it would be 120 V * sqrt(3) = 208 V if there is three-phase. But I think when people in this North American-dominated forum buy these kinds of VFDs, they run it on one phase input. According to Huanyang’s Model No. nomenclature, “HY02D211B” means 2.2 kW 110 V 1-phase input .
Anyway, what I was refering to is that there always should be a current rating for the input current on the nameplate. If they can run with either one or three phase input, you would need two different current ratings.
We have 400 V three-phase electricity here in Europe and 230 V between phase and neutral, from which the 230 V single-phase circuits are laid out. The VFD I bought has a nameplate with all mandatory information for both input and output.
PS: I have found a datasheet of the Huanyang spindles. According to that document, the “GDZ-80-2.2A 110 V” that is shown above is rated 8 A, which means, the 2.2 kW rating would be pure fantasy. With 110 V 8 A you calculate 1.5 kW apparent power, with an assumed power factor of cos φ=0.82 you calculate 1.25 kW real power and with an assumed efficiency of η=85% (estimated rather high for such a cheap motor) you calculate about 1.0 kW mechanical power available at the shaft. With 110 V, to run a 2.2 kW spindle you calculate that you would need about 19 A (per phase) coming from the VFD. The nameplate of the VFD shown above says it can provide 20 A, so it should be able to drive a (real) 110 V 2.2 kW spindle. It’s just that the spindle datasheet mentioned above does not say the spindle shown above is rated with that current. Possibly the 8 A on 110 V version is an erroneous specification, but since the current rating on spindle nameplate is missing…
EDIT: I followed the link you provided @Ziggy, (https://www.amazon.com/dp/B07LG233LM) and there they say 20 A. Is this link correct for your spindle? On the image it reads “GDZ-80-2.2c” instead of “GDZ-80-2.2A”. So if it is rated 20 A, then it’s a 110 V 2.2 kW spindle and it matches the VFD – and the spindle datasheet I mentioned above contains wrong information by saying 8 A for the 110 V version.