[Iniamyen]

Well I got my 80VA 30+30 transformer from SumR, and I'm trying to figure out if I've got it wired correctly. The leads are given as follows:

Primary: black/white
Sec #1: red/yellow
Sec #2: blue/grey

I hooked black to the neutral line and white to the hot line.

I measure a big fat ZERO between every combination of secondary leads. This shouldn't be this complicated - what am I doing wrong??

 

[choomanchoo]

Autobot or Decepticon?

 

[Iniamyen]

Any useful responses?

 

[dgbiker1]

You should measure voltage across both red-yellow and blue-grey. Other combinations don't make sense unless you tie the secondaries in series.

Did you check to make sure you have 120V going into the primary? I once spent 3 days troubleshooting a power supply only to find out I didn't have any power coming from the wall!

 

[Iniamyen]

Yes I measured ~115VAC between the primary leads while it was plugged in.

 

[kuroguy]

disconnect the power and measure the resistance through the primary (black/white) and then measure resistance through both sets of secondaries.

While you're at it, measure the resistance between red/blue and then red/grey, and then yellow/blue and then yellow/grey. Post your measurements.

 

[Iniamyen]

This is from memory but I will verify tonight when I get home:

white-to-black = infinite

blue-to-grey = 0.2 ohms

red-to-yellow = 0.2 ohms

blue-to-yellow = blue-to-red = grey-to-yellow = grey-to-red = infinite

 

[Pars]

It looks like your primary is open? I'd contact SumR.

 

[MN Ham Phones]

If you truly have infinite ohms from black to white...the problem is your primary winding is open. You will measure line voltage across that winding when plugged in regardless if the primary is good or bad.

 

[Iniamyen]

Can't believe I didn't even notice that until I posted it explicitly.

I'll look at it this evening and see if there's something obviously wrong. Where would be the most common place for it to be disconnected? It's encapsulated, so if it happened to be internal to the encapsulation I would be essentially screwed

 

[kuroguy]

yup, white-to-black : infinite = you're boned

 

[Iniamyen]

Turns out I had a bad crimp, on the other side of the switch, that I didn't know about. I need to go learn about transformers again

Secondaries output a rock-solid 33VAC, and I hooked up the s22 to burn-in on some resistors, and it's outputting a rock-solid +/- 29.42VDC.

Thanks for the help!