Hello all,
Figured I would ask the amps 'brain trust' about this.
I recently was given a URT23 military amp, power supply and exciter. It
looks 'as new' and has all the interconnect cables.
The final amp is a pair of 4cx1500b's and is rated for a KW any mode.
Here is the problem. The power supply is a 3 phase supply for 208 volts
or 440 volts, (as I recall.) Trying to figure out my best option for
powering this up.
(Note: I don't usually thing 'out of the box', which is why I'm asking
here.)
http://www.practicalmachinist.com/FitchWConverter.pdf
http://www.practicalmachinist.com/vb/redirect-to/?redirect=http%3A%2F%2Fwww.metalwebnews.com%2Fhowto%2Fph-conv%2Fph-conv.html
http://www.practicalmachinist.com/vb/redirect-to/?redirect=http%3A%2F%2Fwww.homemetalshopclub.org%2Fprojects%2Fphconv%2Fphconv.html
I currently have a 5 hp rotary phase converter which I use with a
milling machine. What I have found on building a rotary phase
converter indicates that 'normally' you would wind up with ~10% more
voltage than the single phase you started with. I surely don't need
260+ volts, when I'm looking for 208 volts. I suppose I could use a 240
volt variac to reduce the voltage on the 3 phase output.
But, another thing to consider. I was looking a the schematic and saw
where some of the smaller transformers were fed from one phase, while
the HV was fed by two phases. Again, from what I read, the voltages of
the 3 phases created from a rotary converter, vary according to the
load. My concern is with the filament supply. If it's off one leg, and
I was to vary the 240 input to get exactly what I need for the filament,
what happens when I start drawing power and that leg now changes by 10
%, or so.
Other choice is to just build a new 240 volt single phase supply for all
the required voltages. It's just that the 3 phase supply is part of a
really clean 'system' and it would be nice to keep it original, if
possible. This seems like it would be the most stable and reliable.
Thoughts?
73 de Steve, NR4M
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