ABB VFD delta high leg

[synchro]

Maybe I missed something, but didn’t the op say the phase loss moved with the changing of the phase? Sounds like it’s in the drive, possibly surge protection on the front end blown and open.

From the OP's post #1:
"I moved the wire on A and the no current "moved" to the new location, C. "

From the OP's post #20:
"I swapped A and C on the VFD input, and the no current "followed" to the new location. "

From the OP's post #24:
"I was back this morning and rotated the phases on the input to the VFD. The result was the same input phase loss fault. I rotated again and still the same result. I measured current and the no current "moves" as well."

In posts 20 and 24, I read that as having the zero current measurement move to a different VFD input terminal when the phases are swapped or rotated. In post 1, I think he is referring to A and C as terminals on a VFD since he calls them a "location" instead of an input phase.

It would be good if it were clarified whether the A phase is the one consistently having a zero current.

 

[kwired]

From the OP's post #1:
"I moved the wire on A and the no current "moved" to the new location, C. "

From the OP's post #20:
"I swapped A and C on the VFD input, and the no current "followed" to the new location. "

From the OP's post #24:
"I was back this morning and rotated the phases on the input to the VFD. The result was the same input phase loss fault. I rotated again and still the same result. I measured current and the no current "moves" as well."

In posts 20 and 24, I read that as having the zero current measurement move to a different VFD input terminal when the phases are swapped or rotated. In post 1, I think he is referring to A and C as terminals on a VFD since he calls them a "location" instead of an input phase.

It would be good if it were clarified whether the A phase is the one consistently having a zero current.

If the swapping leads results in the "no current" following the swap then something in the supply conductors is the problem? Is possible to still measure voltage with no load, but put load on it and then check for voltage. Might need some temporary test load just to test the supply circuit if the drive won't run long enough to measure before fault code shuts it down. Resistance in that conductor will drop the voltage, but only when there is load on it. Voltage won't drop with no current flow.