VFD Error 06 - What does it mean?

What does Err 06 mean on my VFD??

It means that it’s trying to slow down faster than can be handled.

Check p0.0.12 and perhaps increase it
https://support.pwncnc.com/kb/article/196-err06/

My spindle is still spinning when it attempts to make a tool change. The spindle is off, but still spinning down. Why??

I see you just told us on your ticket that changing it to 8 works.
Does this also solve the tool change issue you brought up

Yes and he gave me the link for the Z motor with a brake.

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