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Parallel Port breakout boards, motherboards, and dedicated accessories / Re: grounding signal grounds to chassis ground?
« on: January 07, 2020, 10:56:43 PM »
J11-13 are the home switches. J1-6 are indeed the stepper drivers (Clearpath SD) I removed both grounds and the problem stopped, but I did get spurious limit switch activation entries in the log with no pattern to them.
Later found that I didn't ground the VFD cable shield on either end (yes I am using VFD robotic cable...$$$) and had 50+ volts on it as well so that was likely a HUGE contributor to this as that cable runs parallel for a long time. That is now grounded on the VFD end, the spindle itself is grounded as well.
I haven't reconnected any of the board grounds to chassis ground and it seems to be OK... but... I built a touchplate and its on the J11 side, but when I touch the plate to the frame I occasionally will set off the ++ limits even when nothing is moving and the spindle is off.
This gonna be one of those grounding nightmares . . .
Later found that I didn't ground the VFD cable shield on either end (yes I am using VFD robotic cable...$$$) and had 50+ volts on it as well so that was likely a HUGE contributor to this as that cable runs parallel for a long time. That is now grounded on the VFD end, the spindle itself is grounded as well.
I haven't reconnected any of the board grounds to chassis ground and it seems to be OK... but... I built a touchplate and its on the J11 side, but when I touch the plate to the frame I occasionally will set off the ++ limits even when nothing is moving and the spindle is off.
This gonna be one of those grounding nightmares . . .