Re: Combining dual secondaries of a toroidal transformer

John Fields wrote:

On Sun, 18 Feb 2007 05:00:19 GMT, "Homer J Simpson"
<nobody@xxxxxxxxxxx> wrote:


<furtherside@xxxxxxxxx> wrote in message news:1171770731.461084.227630@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx


Hi, I have a fairly good sized toroidal transformer that has two pairs
of primaries and two pairs of secondaries. The inputs are both 115V
and the outputs are both 33V, at 7A. I'd like to combine the outputs
in parallel, to give me 33V at 14A.

Connect the two secondary commons together. Now check across the other two leads with an ammeter for difference current. If it's only a few mA you are probably OK.


---
Absolutely, positively, definitely NOT.

You're a licensed electrician, where???

In the first place, the secondaries don't have "commons", they only
have starts and ends. Two leads from the secondaries should be
twisted together and one of the primaries energized (with the leads
of the other kept separate and, preferably, taped up to avoid danger
of shock or short) then the voltage across the unconnected
secondaries should be measured with a _voltmeter_. If the reading
on the voltmeter is 66 volts, then the start of one secondary
winding is connected to the end of the other and they're wired in
series. In order to connect them in parallel they should be
disconnected and each connected to the other secondary lead.

Once that's done, the primary leads should be twisted together in
pairs and those pairs connected to the mains while monitoring the
secondary voltage. If the voltage is zero the primaries are wired
out of phase and should be connected in reverse. That should cause
the secondary voltage to rise to 16V.


but then again, one could read the wire tags looking for the
H1, H2, H3, H4 and X1, X2 , X3 and X4 leads.

H1+H3, H2+H4 for the primary.

X1+X3, X2+X4 for the secondary.
But i know your aware of this, this is only for other readers.


--
"I'm never wrong, once i thought i was, but was mistaken"
Real Programmers Do things like this.
http://webpages.charter.net/jamie_5

.

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