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Registered Member #3761
Joined: Tue Mar 15 2011, 12:29AM
Location: Toronto, Canada
Posts: 15
I have a 115v 100VA/ 28v out transformer and it has 3 wires for the primary red, white and brown. I wired the primary's red and brown wire to the hot wires and the white wire to earth ground. when i plugged it in I blew a fuse, I'm thinking that I have a short but I'm not really sure. Any help would be great!
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
I take it there's no documentation. As James says, start with an ohmeter and determine which sets of wires are isolated from each other, and which set has generally higher resistance.
I can't think of any reason a winding with three wires (e.g. a tap at some intermediate number of turns) would ever want two of them to be shorted together. What were you thinking? In the worst case, the white wire is a center tap; by applying voltage between it and the red & brown together, the winding inductance cancels out and you have just the two DC resistances in parallel. (a few ohms?). In a more common case, the red and brown wires are electrically close together -- let's say if red is 120V from the white wire, then brown will be 100V from white and 20V from red. By applying 120V to -both- you induce 24V between brown and red, which are shorted together!
Registered Member #2463
Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
Try wiring up a lighbulb, 120 Volt 100 Watt in series with the power cord you plug into the wall socket. Then power up the transformer, through the light bulb with a 8 0hm 100 watt resistor on the secondary.
When the wiring is correct on the primary, the lightbulb will glow about 3/4 brightness and there should be about 12 volts across the resistor on the secondary.
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Wiring a transformer?
