I have the PWNCNC ER20 110V spindle. I was using a 1/2" end mill on maple and stalled the spindle. Now when I try to re-run the GCODE, it will spin up to the desire RPM, then throw Err 12 and ramp down.
Support gave me this link, which seems to indicate that the most likely culprits are loose connections. Unfortunately, after powering down, restarting, checking all the cables…nothing has improved the situation
Does this mean I’ve blown either the VFD or the spindle?
Thanks,
Randy
Maybe… maybe not…
I’m curious, what happens if you manually ramp it up instead of gcode.
My thinking is inline with the link they sent, in its most likely on the motor side which could have jolted something, where jolting wouldn’t have happened on the vfd side since it was stationary
It’s been a while since i troubleshot a vfd error, but i remember it was first finding what worked right, then work your way back to what’s broken to identify the problem
Manually ramping up also throws the error, without moving the spindle at all or introducing cutting load
Unfortunately there’s nothing I’m aware of that can be said as far as THIS is the problem, and it’ll take some investigating on your part. They might be willing to do some component swapping.
When you said you power cycled, how long was it off?
There’s built in capistors that keep it “on” even after power is removed.
Im going to assume that you powered down at the end of the day and that it didn’t fix anything which as the kb suggests its a wire issue, to which i don’t know how you changed any wiring by running the spindle with a ½" shank bit.
Im sorry, i just don’t have any other remedy for the problem.
Yeah, I did overnight turn off for the power cycling, as well as several different ones other times just hoping for the magic IT fix 
I, too, can’t see how this is just a wiring connection issue any more.
For people on the edge of their seats…
Contacted support (who have been super helpful!), I swapped the VFD and still had the issue. So now it’s down to cable or spindle.
Figured out how to open the connector and found this
I can’t say that I didn’t break the wire taking it apart, but it’s the next obvious thing to try as a fix. So for future people receiving an Err12, check inside the connector. There was no obvious wear on the cable, though the strain relief seemed a bit looser than I might’ve expected.
Wow! I’ve seen some damage before from electrical… i bet it’s got a strong electrical smell.
Surprisingly, didn’t stink. Not sure if that means I had a mechanical failure which caused the Err12 (and therefore the stall), or if the stall caused an electrical surge.
Either way, reflowing the solder makes everything work again! Will be buying a backup cable, but for now I can get back to work.
