Its not encoder related as far as i can see 

I had a spare 600ppr encoder so wired that in and connected it by clamping in the spindle.

It still suffers the same fault, just slower as there are only 2,400 pulses instead of 10,000 per rev - the error count just goes up slower.

It still worked ok until 2980rpm.

Using my bench PSU at 10v it was giving 2965rpm one way and 2971rpm the other.

It was also creeping with the inputs shorted out.

I ran the auto zero speed set function which killed most of the creep.

Then adjusted the gain to 305rpm/V

It now gives 3000rpm forwards and backwards.

Did it fix the issue?

No


A short video of the Pid screen at 2990rpm and 3000rpm

https://youtu.be/i7GEe7jAoY4

Using my bench PSU at 10v it was giving 2965rpm one way and 2971rpm the other.

It was also creeping with the inputs shorted out.

I ran the auto zero speed set function which killed most of the creep.

Then adjusted the gain to 305rpm/V

It now gives 3000rpm forwards and backwards.

Did it fix the issue?

No


A short video of the Pid screen at 2990rpm and 3000rpm

https://youtu.be/i7GEe7jAoY4

as mentoined in Reply#120

as mentoined in Reply#120

Of course, i'll butt out on this topic, apologies again.

I know I have stopped this thread due to it being against rules but was hoping to add one more entry for closure - might help someone in the future.

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??

No idea about tuning yet but that is not for the mach Forum, thanks for all your patience on this one guys

I think TPS actually meant post 119 rather than 120, he mentioned about 2950rpm being the max at 10v. nothing to do with post 120 so I wouldn't worry about that

Good to hear you have it running, it is always the things like that that are a headache, had similar nightmare  with the VFD on the lathe, somehow it changed itself to be looking for a serial command connection rather than a voltage command and it took ages for me to work out why it wasn't working

Ah that's good to know, I know talking about other products is frowned upon so will keep it minimal

Yes, oddly though it still faulted when i set the max rpm to 2950 but at least its happy now.