"Pete C." wrote:

"Michael A. Terrell" wrote:

PrecisionmachinisT wrote:

"Michael A. Terrell" wrote in message
m...

"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?


Because in the case of an RPC, the entire downstream bus in all probability
has excessive voltage imbalances when measured phase to phase and even even
a few percent of voltage imbalance has a very profoundly negative effect on
motor temtrature rise and energy losses to core heating....

Are YOU that stupid?

Sigh. Are you saying that you will adjust each transformer as you
change the load?

No, I'm saying you use what you have and if you have three small
transformers that will do the job after the RPC, you use those instead
of buying a new transformer.


So, you are going to use them on the output to protect the load, but
not the VFD or the RPC?

What good will they do on the output, if the three phase motor in
your RPC is saturating and smoking, or on fire?


You do know that if the three transformers are identical, they can be
run in parallel?


--
You can't fix stupid. You can't even put a Band-Aid™ on it, because it's
Teflon coated.