bpk
Senior Member
- Location
- Northern Minnesota
I was always under the assumption that a VFD voltage output stayed constant, but today I was talking to coworker saying that the output voltage varies with the output frequency, is this true?
It is true*. The V/f ratio is constant.I was always under the assumption that a VFD voltage output stayed constant, but today I was talking to coworker saying that the output voltage varies with the output frequency, is this true?
In general, no. With some VFDs, you might get a few % over 480V on the output, but no more.
(With the caveat that the DC switching voltage described above is being ignored.)
-Jon