Installing inverter, keep converter?

[King]

Lou    Model 6332...  definitely ferroresonant..  the small circuit board is what shuts off the charging circuit when the target voltage is reached.
Art

 

[Karl]

From the circuit diagrams I've seen, the 6300 doesn't use a ferroresonant transformer to hold secondary voltage steady. The main transformer is simply a center-tapped winding; each side connected through a rectifier with their outputs connected together to provide a 60Hz pulsed dc voltage. A ferroresonant transformer would have two separate secondary windings; one of which would have a high voltage capacitor (around 400v) across it, and nothing else. The other winding is used to connect to the rectifiers for dc output.   

 

[King]

Nonetheless it is a variant.  The capacitor across the secondaries (on the AC side of the diodes) provides the resonance.. it doesn't act as a filter...  the secondary actually has four separate windings, two paralleled pairs connected together, as you say, center tapped.  That is why Magnatek units always hum whether loaded or not.
Art

 

[Karl]

Sorry, gotta disagree. There's no way that dinky .47 mF cap. can pass enough to saturate the core and, by definition, a ferroresonant transformer must have at least one separate winding to do the job; two if you want good buck/boost regulation. Obviously their arrangement doesn't work 'cause the voltage varies all over the place.

 

[King]

You may be right...  my schematic doesn't show the cap value.
Art