Electronics for New Machine + Chinese Spindle + VFD

[JAZZCNC]

I was told that 3.8Amps / 10 Microsteps would be a good place to start. With SW4 (half current mode) set to to off.
Does that make sense?

The Amps should match or be close to the Motors rating as possible. Good drives will let you set exactly to match motors but If no exact match then set to next lowest. You'll just have lower than rated Torque but better than going higher and having more motor heating.

Wouldn't go above 10x Ms because you'll gain very little just stress the system more. Often the machine will dictate to some degree the best MS setting based on the resonance and how it affects the motors at different speeds. Again better drives will handle this better allowing optimum Ms without sacrificing anything in terms of motor smoothness/speed.

You want half current Mode On because it lowers motor heating when stood still.

4. Jazz would those 5A time delay stepper fuses in your diagram in theory protect the machine / me at all if it should stall or crash ?

No won't protect you or the drives from stalling or crashing or will it need to because the drives should be able to handle that them selfs and you should have E-stop fitted to protect YOU.!!. . . But will in the event of short circuit in say motor etc.