Dear Rich,
Thanks for the reply.
The schematic of the xfmr, as supplied by PWD, shows the dual
primary windings "side by side" (however vertically) with the
associated pin-outs corresponding to the original ALPHA 77
transformer plug. This means that the uppermost winding
has pin 6 on one side of the coil and pin 12 on the other, or lower
side of the coil. The lower set of primary windings has pin 9 at the
top and pins 7&10 both bonded to the lower coil wire.
This arrangement matches the pin out of the ALPHA xfmr plug
exactly, wherein the pins 9 & 12 are jumpered together for 240vac
service.
Before connecting any a.c., a resistance check was made to
verify continuity and lack of continuity between specific leads
just in case there was a primary-to-frame short, and to verify the
two primaries were indeed being connected correctly.
If a phase reversal occurred in winding the xfmr, the error was
embedded and the leads extended so that following the diagram
produced the damage.
(Yes, no, Maybe???)
Thanks,
Hal
> >
> > Doing a bench test of my new P.W.Dahl custom-wound
> > filament transformer with no loads attached the breaker was on
> > for under five seconds before the unit burned out.
> >
> > A small puff of white smoke, a nasty smell and now
> > a fried transformer. All the connections matched the PWD
> > schematic and the voltage was as specified for the primary
> > windings. The transformer had dual 120-vac windings that
> > jumper together just like the original ALPHA xfmrs so
> > 120 or 240 vac service could be selected.
> -- Were the dual 120vac windings connected in-phase or out of
> phase?
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