Check toroid winding polarity

[Nescafe]

Hi,
I'm newbie and right now I have 2 kits of HYPEX uCd 700 kits to begin with, I use 2pcs of TR 700 transformer, one for each amp (dual monoblock) and I'm wondering how to determine the polarity or (or start of winding?) in each transformer so I can connect it identically for each amp.

Is there any way to determine the start of winding of thevtoroidal transformer?

Thank You

 

[gmphadte]

There is no absolute start of winding in a transformer.

However u can determine the phase relation of the secondary wrt the primary. All u have to do is connect one of the ends of the secondary to the one of the primary connection and measure the voltage from the other end of the primary and the single primary end. The voltage will add or subtract depending on in-phase or out-of phase connection.

The polarity of connection is not of any relevance.

Gajanan Phadte

 

[dhaen]

The transformer manufacturer will always use the same colour for the winding start.

For a bi-polar PS, the phase is unimportant when 2 bridge rectifiers are used, but must be in-phase when a single bridge is used.

 

[Nescafe]

Hi,
Thank You for the reply, the problem is there are a lot of wire with the same color, the primary have 2 black and 2 brown wire for each 115V winding, the secondary have 2 yellow color for 61V etc.....

Here are the link for the transformer that I use:

http://www.hypex.nl/index.php?option=com_weblinks&view=weblink&id=32&catid=42

 

[DF96]

That is a link to a power supply, not a transformer.

What is your mains voltage? If 115V, join brown to brown and black to black so the primaries are in parallel. If 230V, join the brown of one to the black of the other and then use the remaining two for the supply - primaries in series. In either case a lamp limiter will assist in safe switch-on.

 

[Nescafe]

Sorry wrong link, below is the right one
http://www.hypex.nl/index.php?option=com_weblinks&view=weblink&id=28&catid=42

I'm using 230V primary since I lived in Indonesia.

Thank You.

Sent from my GT-P7300 using Tapatalk

 

[Nescafe]

Yup I know the connection, but what I want to know which one is the first 115V and which one is the second 115V winding, what I mean is the start of winding.

Thank You

Sent from my GT-P7300 using Tapatalk

 

[DF96]

It doesn't matter. Both windings will have sufficient insulation to withstand 230V.

 

[AndrewT]

In either case a lamp limiter will assist in safe switch-on.

If the lamp lights you have a mistake.
Read up on the lamp bulb tester.

 

[tranqspogi]

in that case sir is depend upon the toroidal Transformer? like tr 700 or tr 600? so in that case secondery ACV is different from Tr 700 than the tr 600 right?

 

[Nescafe]

what I'm lookin for is to find the configuration of each cable TR700, the example is like the link below, each cable have a color code so determine the polarity is easy

http://www.classicapi.com/catalog/images/gallery/GroupDIY/PSU/51x-toroid-specs.pdf

Thank You

 

[godfrey]

This picture from your PDF explains it quite well. The only problem I see is figuring out which is which with the brown and black wires.

You'll need a multimeter for this, set to measure resistance. With none of the wires connected to each other or anything else, there should be a fairly low resistance between the wires marked "A" and "B", and also between "C" and "D". There should be an open circuit (or very high resistance) between either "A" or "B" and "C" or "D".

Easiest is to start with one of the brown wires and check the resistance between that and each of the black wires, to find the one with low resistance. Then do the same for the other brown wire.

When you've got them sorted out, it may be a good idea to tie the pairs together with sticky tape or something, so they don't get mixed up again.