Centroid Community CNC Support Forum

Well... It remains to be seen how many of our remaining issues will be affected by this, but I did find something in investigating the encoder quadrature error that seems to resolve that issue:

On our A520 inverter orientation control pcb (encoder inputs) there were extra jumpered terminals that had never been disconnected when integrated with the cnc controller. By removing the jumpers, I was able to eliminate the quadrature error. It remains to be seen whether that will also affect the spindle fault issue we were having today, but a win is a win.

KreiderMachine wrote: ↑Tue Aug 05, 2025 4:01 pm Ok, it looks like the asterisk is basically solid when running at low speed. I can detect the slightest flicker in it down around 10-20 rpm, but nothing like a pulse you could observe at 120rpm, or even 60. Just looks solid.

It didn't lose counts, really. Gained one count in 490 revolutions if my math is right...

Do I have any options here, other than trying for a different encoder/cable routing?

Is it possible to invert the index/Z pulse output in the VFD settings? This description sounds like it is high most of the time and goes low when the pulse is reached.

I think that he confirmed normal index pulse behavior (one brief flash per turn, always in the same place) when he was turning the spindle by hand.

I think he is saying that the nearly-solid asterisk only appears when the VFD is powering the motor.

Correct, yes. When turning by hand, the pulse is in a repeatable place and only shows up for a single count.

I missed that, sorry. Please disregard my comments and questions there.