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duncan webster	13/04/2021 18:21:34
5307 forum posts 83 photos	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.
duncan webster	15/04/2021 21:46:16
5307 forum posts 83 photos	Found the reason for the lack of power, the primary drive belt was slipping. Should have checked that first, but it's not that easy to see the motor pulley, which is where it was slipping. What it needs is a flinger to keep the oil from the countershaft bearings away from the drive pulley. Another job on the to-do list. Newton Tesla tried to help as usual, but he couldn't diagnose that one.

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