matsuura mc500v mill - VFD advice for spindle motor 80's yaskawa UAASE-5K)

besriworld wrote:

You can see in the driver's documentation that the maximum current is much lower. One is driving a 3.7 kW motor (200V) with a 7.5 kW Delta driver. It doesn't work well. An alarm is triggered under heavier load. I think you need a much larger driver.

Trying to learn something - not challenging you.

Are you referring to a Y-wired motor being driven by a delta-wired VFD?

Or a Delta-brand VFD?

Assuming the Vevor VFD can output 50A (per spec), why would it be a bad idea not to just current-limit the VFD in parameters?

spumco wrote:

Assuming the Vevor VFD can output 50A (per spec), why would it be a bad idea not to just current-limit the VFD in parameters?

I doubt it can do 50A, a 11KW Yaskawa does 45A, both are 200V parts, but i might be wrong, new stuff can handle a lot of power.
Spumco is right, limit the current on VFD to 15 or 20A, see how the motor runs, either way your motor can do 32A only for short runs.

Oops, forget what I said. I thought we were talking about a 3x400v driver. Now I saw the spec.

"Or a Delta-brand VFD " Yes

You can safely run a 200 or 220V motor through a 380 or 480V VFD, just make sure to limit the current, and always there should be at least two settings for current limiting, continous and peak or short term, those are not the same thing so a bit of reading the manual should help. Also limit the frequency/speed to what motor can safely handle, spindle bearings are very iffy if pushed over, also expensive, very.
Either way, as a rule, start small, half current is ok.

Almost forgot, 11KW 380V VFD will not do instead of 11KW 200V VFD, the current will be nearly twice lower on the 380V one, so a 15 or 18KW should do, aim for twice the power.

RE the Delta thing I had assumed that was a type of VFD design I hadn't come across (I know of the motor wiring) hence the 'down the rabbit hole comment', learning is a huge part of the fun of this project.

Thanks for all the advice re the VFD. I'll try and write a little summary of what I've taken away from it once my work meetings finish up.