Transformer wires

[Electronics4you]

Hi there,

In the datasheet for the transformer I'm going to by the wires are described like this:
Pri.: 0V - JOINT - 220V-240V
Black-yellow/yellow-green-brown

Is this right?
The 0V (black) is the negative input

The JOINT is for what?
Are there inputs for both 220V and 240V - why with two wires?

 

[chemelec]

Hi there,

In the datasheet for the transformer I'm going to by the wires are described like this:
Pri.: 0V - JOINT - 220V-240V
Black-yellow/yellow-green-brown

Is this right?
The 0V (black) is the negative input

The JOINT is for what?
Are there inputs for both 220V and 240V - why with two wires?

Yes, Probably 2 seperate inputs.
Some countrys use 220 Volts and some use 240 Volts.
This allows you to Pick ther Most Appropriate Input Voltage.

 

[JimB]

In the datasheet for the transformer I'm going to by the wires are described like this:
Pri.: 0V - JOINT - 220V-240V
Black-yellow/yellow-green-brown

Is this right?

If that is what the manufacturer says, then I guess it is so.

The 0V (black) is the negative input

There is no NEGATIVE in an AC system.
Neutral yes, negative no.

The JOINT is for what?

The primary is probably wound as two 120v windings.
Connect them in series for 240v operation,
connect them in parallel for 120v operation.

Are there inputs for both 220V and 240V - why with two wires?

Like Chemelec said, to cater for different mains voltages.

JimB

 

[Hero999]

Make sure you get the phasing correct though else your transformer will melt down.

 

[RODALCO]

If you do the testing put a 100 or 200 watt lamp in series with the TX under test.
This one will light to full brightness if you have the wrong terminations made.
It will possibly glow a little when all is ok, just magnetising current drawn by the TX.
Use a voltmeter to check for correct voltages on primary and secondary sides.

 

[Electronics4you]

I use 240V
Is this then the right connections?

 

[Hero999]

Connect the neutral to the black and the live (phase) to the red.

 

[Electronics4you]

And then just solder the yellow wires togehter?

 

[Hero999]

No, the yellow wires are the output connections; connect them to the load.

 

[Electronics4you]

The yellow wires are the output connections...?
The transformer has the 5 mentioned wires and then also 3x2 wires for three output voltages.

 

[Hero999]

Measure the resistance between the yellow wires (without anything connected to any of the other wires), if it's a low impdance then it's another output. It's common sense really.

 

[Electronics4you]

I'll try that
Just another question, is it possible to parallel to output connections with different voltage and current marking and then get a higher current output?
What would the output voltage then be?

 

[audioguru]

Why not buy a transformer that is made by a company that knows how to explain how to hook it up?

 

[Hero999]

I'll try that
Just another question, is it possible to parallel to output connections with different voltage and current marking and then get a higher current output?

No.

What would the output voltage then be?

Measure it.

 

[JTECH]

parallel windings

I'll try that
Just another question, is it possible to parallel to output connections with different voltage and current marking and then get a higher current output?
What would the output voltage then be?

A DEFINATE "NO!" When voltages differ, parallel connection will result in unwanted circulating current in the windings, driven by the difference in voltage of the windings (a short circuit of a kind!).