Greenie problems configuring 6i25 with 7i77, using Granite Devices VSD-E drives

DeckelHead wrote: Huh. Then I'm not sure why it didn't work as I have unique limits on my machine. I do share the home and limit on the +Z, -X, -Y switches, but that is a logical distinction. The travel limits on each of the axis are definitely unique.

It might depend on the user interface. Linuxcnc definitely distinguishes between positive and negative hard limits. But I'm not sure which if any of the UIs make a use of that distinction. I'm really only familiar with the Axis UI, and I don't think it does anything different between the two.

I figured it out. Basic lack of familiarity with the tool was the problem, but at least for homing, that is fixed now. Things are moving along, which is great! One thing that is not working, however, is that I must have some limits wrong someplace. After I home the Z axis (currently limiting myself to a single axis), I only have about 100 encoder counts and then I am unable to advance further. My hunch is that I don't have the axis travel specified correctly, but that is a little odd. There are 6 inches of Z travel on the Hurco and I'm sure I put that in.

A Z axis is typically configured with home at the top around 0, and the bottom of travel at (in your case) -6.0

Often home will be zero and the switch slightly positive.
Maxlim 0.1
Minlim -5.9
Home position 0
home offset +0.1
As an example.

Ah! Of course! That pesky negative z axis. I looked at that and got my home switch correctly, etc, but I wasn't thinking that the travel limit would be negative too. Good catch. Thank you.

I will be attaching my tuning plots at some point. I can't get them as clean as the one in the tuning directions. I'm not sure what is "good enough" and what is indicative of poor tuning within the amp itself. Frankly, tuning is the biggest single unknown for me.

Anyhow, I can jog at 60IPM and my 1000 encoder stops about 3 or 4 counts in (so 3 of 4000), which feels like it is probably pretty good (?). I think I'll work on the X and Y axis pretty soon. Z was the safest, for obvious reasons.

One sad thing is that I think my spindle VFD got fried for some reason and I have no idea how. It is possible that it got -10V before I had it configured properly but I'm not sure. All I know is that it has power to it and it looks dead as a doornail. Sigh. 3HP VFDs have dropped a lot in price, though, so hopefully I can get a new one without too much pain.

DeckelHead wrote: One sad thing is that I think my spindle VFD got fried for some reason and I have no idea how. It is possible that it got -10V before I had it configured properly but I'm not sure. All I know is that it has power to it and it looks dead as a doornail. Sigh. 3HP VFDs have dropped a lot in price, though, so hopefully I can get a new one without too much pain.

You might as well take the cover off and check for internal fuses.

A VFD isn't _that_ complicated. You can (carefully) check that the input stage (diodes and capacitors) is powering up to a (high) DC voltage. If it is a three-phase input device running on single-phase you can also try different combinations of input terminals. Perhaps a rectifier diode has failed.

I wouldn't expect complete failure from a miss-wiring of the control terminals.

Yeah, I haven't given up the ghost yet on it. I agree that the concept of a VFD is pretty simple, and I also agree that an input signal problem shouldn't cause a major problem. That is part of the curiosity though. It is completely dead. For all practical purposes, aside from the capacitor charged warning LED, you'd never know it was even hooked to the mains. No LEDs, nothing. That reeks of an internal fuse, but if I can't find one, then it could be that something is truly turned out (but I have no acrid smoke smell that is tell-tale of such events).

I have to do a little more research on it. As my axis home stuff is moving along well, I'll probably look at the VFD before I finish with the axis. The reason is that there will be a lead time if I decide my current unit really is toast.

Alan