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Rotary converter help

plastikosmd

Hot Rolled
Joined
Sep 6, 2003
Location
New England
So in running my new to me but old rotary converter, one lathe was humming a bit like it was getting too much power. It sounded normal if I added more load i.e. Started another machine. Now I started a vdf conversion on a doall bandsaw and got an over voltage error. Running 2 lathes in the background cleared the error. So out comes the voltmeter and questions! Vdf questions to follow elsewhere.



Unloaded voltages (L3 is generated leg)
Input
200 amp
L1-ground 120v
L2-ground 120v
L1-L2 240v

No load post converter

L1-L2 240v
L1-L3 (ranges -jumps around 268-278v)
L2-L3 (ranges -jumps around 292-312v)

Adding more loads brings the high voltages down to 240-260ish range

So,do I just run machines, add a motor in series or spend money and add a voltage equalizer thing that I googled?
 
Show the circuit design, including voltage balancing capacitors.
Only the L1-L2, L1-L3, L2-L3 measurements have any meaning.
Tuning the RPC to the most often used machine is what I would do.
 
I have not opened up the converter yet, will post a pic when I do as I doubt I will be able to fully interprete the circuit myself
 








 
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