AXBB-E any opinions?

[n0f8r]

I couldn't run my VFD from the isolated outputs due to earthing issues. Looking at the manual it seemed to imply that the NI outputs were 0...5V (although one of the examples half contradicted this) - my VFD has something like 16V on the inputs when not pulled down and I didn't want to risk blowing the AXBB-E.

Ok - thanks - looking at getting one of these since my current chinese controller does random shit (like sending the gantry in random directions at full rapid speed) when I try to use Mach3 probe wizard routines from ProbeIt or ProbeWizard - and the ProbeIt guy says the CNCDrive controllers work...

Bit confused though - shouldn't an opto-isoloated output from the AXBB help avoid grounding issues?

[edit] - I still haven't really got my head around ground loops - but I suppose it depends on how you're powering those outputs and the VFD, and I guess the opto-isolation is only between those outputs and the Ethernet inputs from the computer

so I guess I'll just try it and hope for the best - I'd guess my current controller has the same kind of direction output feeding into my VFD, so hopefully that means I don't have the same grounding issue.

[ngwagwa]

Ok - thanks - looking at getting one of these since my current chinese controller does random shit (like sending the gantry in random directions at full rapid speed) when I try to use Mach3 probe wizard routines from ProbeIt or ProbeWizard - and the ProbeIt guy says the CNCDrive controllers work...

Bit confused though - shouldn't an opto-isoloated output from the AXBB help avoid grounding issues?

[edit] - I still haven't really got my head around ground loops - but I suppose it depends on how you're powering those outputs and the VFD, and I guess the opto-isolation is only between those outputs and the Ethernet inputs from the computer

so I guess I'll just try it and hope for the best - I'd guess my current controller has the same kind of direction output feeding into my VFD, so hopefully that means I don't have the same grounding issue.

I got the AXBB-E and upgraded from Mach3 to UCCNC at the same time and am glad I did. One thing I didn't know at the time was all the built in probing options. You can download it and runn in demo mode to take a look at them.

[Voicecoil]

Bit confused though - shouldn't an opto-isoloated output from the AXBB help avoid grounding issues?
.

The problem for me was that my VFD shares the same ground for the 0-10V speed control and the ON/OFF port - joining this ground to the isolated output ground which switches various things on the machine didn't seem to be too clever from the interference point of view and was causing some weirdness. It's just a shame the isolated outputs don't have separate grounds, but I guess there's just not space. That done the AXBB-E seems to work well.

[ngwagwa]

The problem for me was that my VFD shares the same ground for the 0-10V speed control and the ON/OFF port - joining this ground to the isolated output ground which switches various things on the machine didn't seem to be too clever from the interference point of view and was causing some weirdness. It's just a shame the isolated outputs don't have separate grounds, but I guess there's just not space. That done the AXBB-E seems to work well.

I had issues when I connected my 24V ground to the chasis so I could use it for probing. Ended up using an old laptop 16V power supply fr probing. Can't remember what the problem I had was.

[n0f8r]

The problem for me was that my VFD shares the same ground for the 0-10V speed control and the ON/OFF port - joining this ground to the isolated output ground which switches various things on the machine didn't seem to be too clever from the interference point of view and was causing some weirdness. It's just a shame the isolated outputs don't have separate grounds, but I guess there's just not space. That done the AXBB-E seems to work well.

Ooooh - right ok, that makes sense, thanks! my VFD has separate grounds for the low voltage analogue speed control and the higher voltage direction control - so it looks like I just wire it up the same as my existing controller and I'll be good.

Thanks again!