Controlling the spindle with UCCNC

[TheG]

Hi everyone,

I’ve built a RatRig StrongHold Pro CNC with an AXBB-E controller.

Right now, I’m having trouble controlling the spindle through UCCNC. The spindle works fine when I control it manually using the VFD knob — I can start it and adjust the speed manually without any issues. But I’d really like to control the spindle speed directly from UCCNC.

I’ve followed the CNC manual’s wiring instructions, but I’m not sure if the manual is outdated or if I’ve messed up the connections somehow.

The manual states:

Connect the red wire to the VI terminal on the VFD and the A01 analog input on the AXBB-E
Connect the black wire to the black PTFix Block and the ACM terminal on the VFD
Connect the FOR terminal to the DCM terminal on the VFD
(See attached screenshots of the manual and my UCCNC settings.)

However, my AXBB-E board looks a bit different than the one in the manual. At the ANALOG IN/OUT section, my board doesn’t have Ai1, Ai2, AO1 labels — instead, it just has pins labeled 1, 2, and 1 again (attached photo). Could this be causing the issue?

Also, I noticed that the FOR and DCM terminals on my VFD are permanently bridged. Is that correct? If so, what are the proper UCCNC pin assignments for this setup? I imported the RatRig profile into UCCNC, but I’m wondering if there are any differences with the updated AXBB-E controller.

Thanks in advance for any advice!

— G

[cncdrive]

Yes, the difference between the AXBB-E in the manual and the AXBB-E you have is only the sticker on the top of the AXBB-E.
You have the new stickers on which there is Analog in 1. and 2. and Analog out 1. , on the old sticker these were marked AI1 and AI1 and AO1.
The problem with the old markings where that users often misunderstand the labeling and read A11 while it was AI1 where I stands for Input.
For this reason we changed the markings to avoid this misunderstanding.

I think the FOR in your VFD is the direction terminal, if it is bridged then your spindle can only run to one direction.
You could control the spindle rotation direction with connecting it to an isolated output of the AXBB-E.
You can use any isolated outputs, you then have to assign the outputs in the UCCNC configuration on the spindle settings page according to your connections.