Been busy doing grand dad impressions all day, but just had time to measure input current (single phase from the mains). No photo as that really was a lash up (take the fuse out of the plug and put attach the DVM to the clips, it's only dangerous if you touch it).
No load on lathe 0.3A
loaded enough to slow it down significantly 0.7A.
If it were delivering 0.54A to the motor I'd expect at least 0.93A, more to allow for vfd losses. I'll contact Newton Tesla ASAP but on hospital visit tomorrow (not me, SWMBO)
The print in the manual is too small to photograph, but the same inverter does both single phase and 3 phase input. Either connect 200V 3 phase to R, S, T, or 200-230V 1 phase to R & S, T left not connected. The motor is connected to U, V, W.
I've also checked the continuity of the motor coils, I get the same resistance (77 ohm) across any 2 out of 3 connections, which suggests no coils burned out.