Adding a 4th axis spindle to my mill, servo troubles

[Davek0974]

What happens if you up rpm/v to 400?

There may also be a setting somewhere for maximum motor frequency.

In fact, I've just had a scan of the manual I have and notice the following paramters-
PN020 - Rated speed setting
PN051 - Motor top running speed limit
PN198 - Torque Control speed limit (should only apply in torque mode, but I assume you are using Speed Control mode?)

Yes speed mode, I have tweaked..
PN158 - Gain
PN159 - Zero offset
PN051 - Top Speed

Will check PN020 - rated speed.

I think i listed what happened when i tweaked RPM/V or Gain setting - it altered the acceleration ramp one way and lowered the top speed the other way, both expected results really, I have it on 305rpm/V now which was determined with a bench supply at 10v and tweaked gain to give 3000rpm. It made no difference though.

Maybe the rated speed AND the max speed need to be slightly above where i want to run say 3010rpm? Just guessing here as this is going way beyond my knowledge but could it be the controller calling for 3000 and the motor never quite giving it hence the following error rise????