I am trying to connect an AC line filter (rated for 115/250VAC) on the load side of a 24VAC transformer (part# BPD2G, datasheet here).
The first filter model I used is Delta's 03DBAW5.
From the datasheet, I couldn't really figure out what each wire was. I assumed the green/yellow cable is the neutral line, so I connected that to the ESD cable on my workbench to ground it. I also figured, since this is supposed to be chassis mounted, that the metal shield of the filter should also be grounded, so I clipped one of the side mounting holes to the ESD ground cable as well.
I then connected the input brown and blue wires to the output screws of the 24VAC transformer, which was plugged into a 120VAC wall socket. The output brown and blue wires of the filter I connected to the power input of my device (which can take up to 60VAC/DC and has a full-bridge rectifier plus step-down converter and LDOs to power the device at 5VDC and 3.3VDC).
I measured the voltage at the output of the filter (input to my device) and saw 12VAC across it. Before I could measure the voltage at the input to the filter (it should read 24VAC from the transformer), I noticed that the outlet/transformer had started smoking and immediately unplugged it.
What have I done wrong? Is this filter only usable on the high side?
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