huanyang vfd won't communicate get errors.

To be honest, I haven't even checked

I tend to set lathe spindle speed by chip colour and surface finish.

Thanks Andy. I'm probably nit picking for my uses but I wanted to make sure things are set up properly. I tried setting parameter 144 higher by 20% but it did nothing. I'm sure it could be handled in HAL but I'm not very accomplished in that area. If the sword could be altered by 20% that should do it. I'm surprised that the VFD isn't more accurate. Using mostly AB in the past they were much closer although not perfect. I checked my tach against the fluorescent lights and it is pretty accurate.

20% is exactly the difference between 50Hz and 60Hz. Though that is unlikely to be the source of the error with a 400hz motor.

P144 should be the motor speed at 50Hz. You would need to set that _lower_ to get higher frequency requests for the same commanded speed.

andypugh wrote: To be honest, I haven't even checked

I tend to set lathe spindle speed by chip colour and surface finish.

Sorry to go off topic, but could you please do a short explanarion with pictures on what is a good cut and what not. I do a lot of smal spindle shafts for the enravers on a smal lathe, usualy ending up with good results, but occasionaly i mess up something and the results are pittyful.
Thank you.

I tried lowering parameter 144 to 1920 and raising it to 2880 and neither change affected the spindle speed.

I have found that parameter 144 does not affect the accuracy at all. I set the maximum spindle speed overide in the ini file to .8 so now the speeds are correct until I can figure this out.