Electronics > Beginners
UPS transformer with 3 wires altogether
max.wwwang:
--- Quote from: SeanB on February 17, 2020, 05:41:50 pm ---The transformer also looks like the low current section of the windings is done in copper wire, but those parallel pairs used for the 24VAC section look suspiciously like CCA wire, the curse of modern electronics and motors, as it fails quite quickly from insulation failure, breaking from fatigue at the ends, or simply corroding away from the terminals.
Otherwise the transformer at least has a thermal fuse, and also has double insulation between the winding sections, and probably will actually work with the thinner winding disconnected from the thick, though it will definitely run hot.
--- End quote ---
If the thinner winding is disconnected from the thick (so isolated), why will it run hot? Thanks.
Jwillis:
I think ArthurDent has it correct. The secondary is tapped off the primary common. Its a 240 to 24 Volt auto transformer.
Sorry I had to correct a mistake
max.wwwang:
I've taken two more photos of the board (both sides) for easy analysis. For easy reference, I've flipped the top side (up side down) so the traces and components are in the same places in the photos.
I've also added red lines showing connected traces (at the other side) and big components with simple symbols using Windows Paint.
max.wwwang:
The other side.
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