[mactec54]

I think i've just partialy solved the issue by doing few more tests. Problem is that VFD documentation is not accurate. Documentation on PD052 options says this:

06: Uniform Frequency 1 Reach: The contact will act when the output frequency of the inverterreaches the designated frequency (PD060).
07: Uniform Frequency 2 reach: The contact will act when the output frequency of the inverterreaches the designated frequency (PD061).
08: In Accel: The contact will act when the inverter is in ramp-up.
09: In Decel: The contact will act when the inverter is in ramp-down.

But i've found that in reality these are implemented other way round:

06: In Accel: The contact will act when the inverter is in ramp-up.
07: In Decel: The contact will act when the inverter is in ramp-down.
08: Uniform Frequency 1 Reach: The contact will act when the output frequency of the inverter reaches the designated frequency (PD060).
09: Uniform Frequency 2 reach: The contact will act when the output frequency of the inverter reaches the designated frequency (PD061).

So this somewhat solves my problem. Now i can set PD060 to detect whether spindle runs over 8000 RPMs. However i can't tell if it's running under 8000 RPMs or is stopped completely. But that can be probably solved by adding few more relays (if i don't find easier way to do it).

There is nothing wrong with the documentation, its having the right documentation

It would depend on what model VFD you have as to which way the Parameters are set, there are many variations not all manuals are correct for the VFD Drive you may have, You have to get the right manual that suits your VFD, what you are saying is correct, and not the other way round, here is a snip from one of there manuals