dmp
Well-known member
I was hooking up this power transformer with the primaries parallel and the secondary series to have a 30V CT going into a power rectifier PCB.
I connected the red-red and blk-blk to the fused IEC 115V (parallel)
I connected one of the secondary blue to green and into the rectifier as grn \ blue-green \ blue for AC \ CT \ AC
This seems like it is correct hookup, but the transformer got warm and blew the fuse.
Then after a lot of frustration, I switched which blue was connected to which green and it worked fine - did not get warm, did not blow the fuse.
I think I had the two secondary windings in the wrong polarity, but I can't figure out why? Does someone understand what was going on? It seems like the secondary polarity would be right if either blue was connected to either green.
I connected the red-red and blk-blk to the fused IEC 115V (parallel)
I connected one of the secondary blue to green and into the rectifier as grn \ blue-green \ blue for AC \ CT \ AC
This seems like it is correct hookup, but the transformer got warm and blew the fuse.
Then after a lot of frustration, I switched which blue was connected to which green and it worked fine - did not get warm, did not blow the fuse.
I think I had the two secondary windings in the wrong polarity, but I can't figure out why? Does someone understand what was going on? It seems like the secondary polarity would be right if either blue was connected to either green.
