Good morning

I'm hoping someone can help me. I recently built my own machine and took my existing 2.2kw water cooled spindle/and Huanyang VFD from my old machine and moved it over.

For the new machine I decided on a Phoenix CNC board to control things. Everything but the spindle is working correctly.

The board will allow me to turn on/off the spindle which seems to work fine. It also outputs up to 10v from the PWM socket when not connected to the VFD.

When connected to my VFD and the VFD is turned on it will automatically draw almost 3v from the board (without an M3 command).

I can't get an accurate speed on the spindle. When running can't get a speed over 15000 rpm when set at 24000k.

The board is connected via VI and GND.

I've done a full reset on the VFD. I've checked the G code settings. I've re-setup the vfd with the settings as per this page:

http://www.halfbakedmaker.org/blog/post_id

I did change PD070 to 0 for 0-10v but everything else is the same. I even upgraded the boards power supply to 24v on the off chance it could not supply the voltage.

It's like the VFD is drawing in voltage, it's as if it needs a standard 3v then needs to be 'topped up' by the board. Every measurement I take from the board is approx 3v lower than the expected if you turned 10v/24000 rpm.

I've checked the board when not connected to a VFD and the output is as you'd expect at 0/12/24k rpm.

I'd appreciate any insight or thoughts on this.