Originally Posted by
Rimbaldo
Ok. Grounded PC (wasn't grounded) to lathe bed (wasn't grounded) to controllers. Grounded everything.
Seems to have improved a bit, but still the same effects happen. Touching the bed with my finger seems to make it difficult to the letters appear in notepad. Changed USB ports have shown no improvement. Added a USB HUB also to no effect.
Used two ferrite cores one on each end of the usb keyboard cable, also to no good.
Tried another keyboard (older one) and it behaved much better, but still when I touch the lathe bed, it stops sending the letters to the screen, or it slows it down a lot..
Still didn't try a wireless keyboard, but for this use, a wired one is a better option for safety...
The farther the keyboard is from the lathe (and it's motor), the better it responds, but in my case, it's in a drawer right below the bench where the lathe stands..
I could try to change the usb cable from the keyboard to a shielded cable.. orr a cat 6 cable... don't know if it would work....
Running out of options... is there a way to isolate, filter the EMI from the BLDC motor? Is there a filter for it?
Thanks for the help!
Rodrigo