I am in the process of building a small CNC router for woodworking, at least I was in the process. This whole spindle motor debacle has put a screeching halt to my projects.

I originally purchased a 1.5 kw, 220 volt water cooled spindle motor from Vevor complete with VFD. The VFD would not communicate with my controller (Rattmotor RMHV3.1) so I purchased a new VFD.

The new VFD is a TECO Westighouse L510, 230 volt, 1.5 kw unit.

I set the correct motor parameters into the VFD -
Motor Rated Current = 8 amps
Motor rated frequency = 400 Hz
Motor rated speed = 24000 RPM

Right from the start the VFD would trip out while the motor was spooling up giving an error message OL1.

I ordered another motor thinking perhaps I somehow damaged the first one and I get the same result.

The VFD manual suggests the following causes:
* Voltage setting V/F mode too high?? I dont know what this means
* Motor rated current set incorrectly. It is set at 8 amps.
* Load too heavy. The motor is running under no-load conditions

I measured the resistance between the phases on the motor and get around 1.6 ohms across all phase pairs.
I put a clamp on ammeter on the conductors going to the motor and get around 11.5 amps on each phase.

Can anyone help me to interpret the V/F ratio settings and what should the correct settings be?