Toroid transformer no ouput

[eurikain]

Hello guys,

Yes, now I understand what I did wrong. I didn't think that black and yellow were meant to be together and go nowhere else and that only orange and red were meant to be used separately on the rectifier.

I'll go do the checks you asked right now and report back in a few minutes... oh boy I hope I didn't break the transformer... or a new one shall be ordered tonight... ! Learning the hard way.. oh boy x)

[eurikain]

So....

[s]Transformer primary is OK, my ohmmeter shows a low resistance as you said Clive.[/s]

No output on either of the secondary coils. When measuring the resistance it works fine, but no voltage comes out....... :'((((((

What's up doc' ?

[Graeme]

You can also measure the secondary resistance, should be have a low resistance on each and a high resistance between them. Have you checked that you are getting mains voltage to the primary. I would have expected that your input fuse would have blown with your original wiring.

[eurikain]

Ok I'm sorry I made a mistake, the low resistance of the primary side was coming from my body --', so here are the measurements using a ohmmeter set to 1k ohms:

primary: no resistance
secondaries:
black+red = high resistance
orange+yello = high resistance
black+yellow = no resistance
red+orange = no resistance

That fuse you are talking about, is it possible to replace it as mentioned by @uli12us ?

[Graeme]

What do you mean by "no resistance" and "high resistance" ? I would expect to see less than 10 ohms between the Blue and Brown on the primary. I would also expect to see less than 3 ohms between the Red and Black as well as the Yellow and Orange. Can you let us know the actual values you are seeing.

[Clive S]

eurikain Follow Graeme instructions to the letter one step at a time. The fuse he was talking about would be the one you have installed not the one inside the transformer (if that has gone send it back under guarantee) .
I will butt out now as too many cooks spoil the broth and I am sure Graeme knows what he is doing.

[eurikain]

What do you mean by "no resistance" and "high resistance" ? I would expect to see less than 10 ohms between the Blue and Brown on the primary. I would also expect to see less than 3 ohms between the Red and Black as well as the Yellow and Orange. Can you let us know the actual values you are seeing.

I happen to have a meter that does not have a digital display but just an indicator. I will go borrow my friend's ohmmeter to have better readings this afternoon.

The meter sends 1000 ohms, so if the measured resistance is supposed to be 3 ohms, it is nearly impossible to see the indicator move. But fr the "high" voltage, I see it easily as the indicator goes to the maximum value. Do you understand what I mean ?

[eurikain]

Alright, just got the digital meter. Here is what I measured:

Primary 230V: 0 ohm resistance
Secondaries:
red+black = stable 5 ohms, peeks at 20-40 ohms (probably due the the meter ?)
orange+yellow = stable 5 ohms, peeks at 10-30 ohms (again, most likely due to the meter)
red+orange = 0 ohms
black + yellow = 0 ohms

Verdict ?

EDIT: @Graeme
I had not set up a fuse for the transformer. I only have fuses between the drives and the screw terminals.

[Clive S]

Alright, just got the digital meter. Here is what I measured:

Primary 230V: 0 ohm resistance
Secondaries:
red+black = stable 5 ohms, peeks at 20-40 ohms (probably due the the meter ?)
orange+yellow = stable 5 ohms, peeks at 10-30 ohms (again, most likely due to the meter)
red+orange = 0 ohms
black + yellow = 0 ohms

Verdict ?

EDIT: @Graeme
I had not set up a fuse for the transformer. I only have fuses between the drives and the screw terminals.

OK with the absence of Greame to save you time I think you are reading the meter incorrect in that the primary is open circuit ie infinity resistance and not 0. Does the meter have a continuity range? (ie if you short the meter leads together to make a buz) . if so does it buz when you connect it across the primary?
So you will have to send the transformer back.