On May 9, 9:16*pm, "Pete C." wrote:
Gunner Asch wrote:

On Mon, 9 May 2011 14:43:24 -0700 (PDT), Cross-Slide
wrote:

Or is the output 24 volts?

I see I havent gotten everything back from the stroke....sigh

If you do a search on "buck boost wiring" you will find references for
how to wire one of your transformers to "buck" your 249V down to 225V.
Basically, the 24V secondary goes in series with the feed to your RPC,
and the primary just connects to the line. The secondary amp rating at
24V has to be enough to handle the load of your RPC/machine.

http://www.jhlarson.com/ind_tables/G...uckboost01.htm

If your transformers are large enough to handle the single phase load
see single phase diagram A and you'll need only one transformer.

http://www.jhlarson.com/ind_tables/G...uckboost03.htm

If the transformers are only large enough for the three phase load
you'll need to use three of them after the RPC. See diagram F, which is
really the same as the single phase setup in triplicate.

NOOOO !!

Never put a transformer in the Output of a VFD!
It is variable frequency... Those transformers are NOT going to be
amused with 20 HZ !!

Keep the Buck transformers in the Line side, where they get 60 hz.
just the way they like it..

Correct. Even I remembered this G

Except we're talking about an RPC, not a VFD.

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

" Ive got a 5hp PC3 vfd running my Gorton MasterMill.
The top end voltage it is supposed to run on..is 230vts + about 5
volts
It will run down to 200 volts.
Im running it on single phase, been doing it for years. "