Re: Motor calculations? Help!

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "snaketracks" <jevs@c...>
wrote:

>
> That is correct the 120V is what comes out of the secondaries. THe
> input can be set for many different inputs, but is currently set

for

> 220V 3 phase. I pretty much forgot about the idea of using the

three

> phase transformer. From what I read it could work, but we be

derated

> to 1/3 which would be too wimpy. Whover said get a 220:120 step

down

> rated at 2.5 KVA pretty much hit the nail on the head. 2.5 KVA is
> the original transformer value. I don't really need 120 on the
> secondary though, it would be nicer if it was about 90.
>
>

From the post below it sounds like you could get 2/3 power from the 3
phase transformer by using 2 windings. It would cost nothing to try.

Wally


From: "spc_aux" <aux34@s...>
Date: Sat Mar 19, 2005 11:12 am
Subject: Re: Motor calculations? Help!

You're missing that he only has 120/240v single phase power to feed
the three phase transformer. He should be ok feeding one or two
sections of the transformer with the 120/240v (quasi two phase).

I'd not try to feed the third section if it's a common core type of
transformer. If it's the less common type of thransformer that is
really three seperate single phase transformers mounted in one
enclosure then you could parallel all three without issues.

Pete C.