On May 12, 10:41*am, rangerssuck wrote:
On May 12, 11:14*am, "Pete C." wrote:



"Michael A. Terrell" wrote:

"Pete C." wrote:

"Michael A. Terrell" wrote:

"Pete C." wrote:

"Michael A. Terrell" wrote:

Cross-Slide wrote:

Maybe YOU are talking about an RPC, but the subject of the OP is " VFD
question "

* *It doesn't matter, since the transformer goes before anything else.
It operates at line voltage, and in Gunner's case at a constant 60 Hz.

It does matter, a set of transformers can most certainly come after a
RPC, if you only have buck transformers large enough to handle the three
phase current, not the single phase current.

* *Why would you put three after the RPC when one at the input ddoes it
right? *Are you that stupid?

I'm not stupid, but you may be if you are that clueless as to the
context and the point I made about the transformer sizing. If you have
for example three 1KVA transformers on hand but no 3KVA transformers,
it's a pretty easy choice to use the three you have downstream rather
than buy a new transformer to use upstream.

* *OK, if a hack job pleases you.

A "hack job" utilizing parts you already have on hand vs. spending money
buying new parts will please most HSM folks. We are talking HSM here,
not in a factory where you would have real three phase power anyway

Wait! You're both right! But, I just re-read the original post. Gunner
doesn't make it clear whether the overvoltage alarm is coming from the
mill or from the VFD. If the latter, then you'd have to make the
adjustment on the single-phase input. If the former, you could do the
adjustment on either end, depending on what transformers you have on
hand.

For the eleventh time... You cannot use transformers on the output of
a VFD !