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

[Davek0974]

But what can i do about it?

[magicniner]

It should be covered in the user manual, parameter manual or commissioning manual for the drive.

[Davek0974]

It should be covered in the user manual, parameter manual or commissioning manual for the drive.

Not with these drives, manual is chinglish i'm afraid

[magicniner]

Sorry Dave, I only buy stuff with well written English Language manuals ;-)

[m_c]

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?)

[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????

[Davek0974]

I think I have fixed it :)

Two parameters -

PN020 - Motor rated speed - this is set by default motor settings
PN051 - Motor Max Speed - this is a user adjustable one

PN051 Max was set at 3000 - i had tweaked this before but not the other one as it's a default setup one.

I have now set both to 3050rpm and away she goes :)

My working theory is that the controller was calling for 3000 but the drive was maxing out somewhere around 2990 - where it faulted so it was stuck in an endless fault loop - controller saying "I want more” and the drive saying “you can't have it”

Short video…

https://youtu.be/ksGlgcCWO4s

I think it makes sense??

Also in the video you can see it runs with a error of about 1980 - is that god, bad, ugly??

I can tune it but have not idea of tuning spindles - as said above, they are nothing like axes drives.

Thanks for all the help BTW.