I'm wiring up my VFD (KBAC-27D purchased with the KMG Grinder), and I think I have it figured out (I'm not an electrician, but I can follow instructions, sort of).
But...I have four wires coming out of the wall (two hot, one neutral, and a bare ground) but only three wires from the VFD (two hot and a ground). Suggestions? I've heard various ideas:
1) Connect both the neutral and the ground from the wall to the ground coming from the VFD
or
2) Wire nut off the neutral coming out of the wall and attach the ground from the wall to the ground from the VFD
or
3) Connect the ground from the VFD to the neutral coming out of the wall and leave the ground coming from the wall unattached
Ideas? How did you hook yours up?
Steve Morley
If your case is metal connect the ground wire to it. Simply add a lug inside the case. I also ran a ground wire to my metal table, all from the same source.
Steve
If your VFD is 220v and has only two hots and a ground wire on the line side, then you would only use the two hot and the ground wire from the source.
The neutral wire (usually white in color and also called the grounded wire ) caries the unbalanced load from the equipment back to the source where it is intentionally grounded.
The ground wire (usually green or bare in color and also called the grounding wire ) is used if something was to short out in the equipment it would carrie it to ground, it is used for protection.
By tying the neutral and ground wires together you are putting a possible potential on the ground wire that should not be there.
Just cap the neutral wire off.
Mark
Thank you for the advice. finally got hooked up and running...let the games begin!
Steve
