Transformer Connection Question

[jzontek]

I'm back with more questions.

I have the AMP5 kit, and am about half way done with building it. I am now nailing down the final details on how to connect everything. The latest area I feel I need input on is connecting the transformer. I have read the vendor documentation and Jan's response on connecting the transformer in the AMP5 FAQ post (http://www.41hz.com/forums/topic.asp?TOPIC_ID=372). With that information I think I know what to do.

The attached is a drawing I put together from what I know. It mixes real schematic symbols with crude graphics of components so that I can understand exactly what to connect.


NOTE: THE DIAGRAM ABOVE IS INCORRECT!!! DO NOT USE THIS AS THE BASIS FOR CONNECTING THE TRANSFORMER, SEE THE LINK A FEW POSTS BELOW.

My other main source of information was the Avel Lindberg documentation (http://www.avellindberg.com/pdf/avel_y23_range.pdf). The graphic below is from the document referenced here. The Avel Lindberg support person suggested I use the top method for connecting

Please let me know if my drawing above is doing anything wrong, not optimal, or worse, downright dangerous.




John Z

[Jan]

Hi,

If the two drawings refer to the same transformer, the Red and Orange should connect to the PCB PGND (and PGND to chassis / ground). Black and yellow as you have done, to AC1 and AC2.

The primary side; the connections depend on your mains voltage and what the voltage rating is for the primary windings.

[jzontek]

Jan,

Yes, the two drawings refer to the same transformer, an Avel Lindberg Model Y236759, 330VAC, 22V + 22V (+/-22?).

To address the primary side connection questions, I am providing the following two or three of paragraphs for information.

I live in the US and have nominally 120V (I've seen mine up to 124V) mains.

According to the Avel Lindberg documentation (see the link in the first post), it says the following: "Primaries: 115V + 115V. Frequency: 50/60Hz" (US is 60Hz).

Electrical sockets are wired with three wires, Line (hot is a black wire, Neutral is a white wire, and Ground is a bare copper wire. Nominally, voltage is 120V.

Does this provide you with enough information to allow you to provide guidance on how to hook it up?

Thank you,

John Z

[retaeht]

Hi jzontek

For what I can see jan did provide you with enough information to correctly hook up the transformer to the mains and to the amplifier.

I recommend you to look at the drawings and to read jans reply several times and it should be clear then .

This is also a good oportunity for you to search information from the internet or books and actually learn what to due.You can also use a multimeter to measure and understand the difference with those connections on the secondary side(drawing).

Dealing with the mains voltage is always DANGEROUS.Be very care careful..

[jzontek]

Thank you for your assistance. I have researched, and found the right answer at the following link: http://i90.photobucket.com/albums/k2...nectionsv2.gif


It is a combination of the top two drawings on the Avel Lindberg documentation. The primary side is connected in parallel, and the secondary in series.

I used this and it works fine.


John Z

[Lulu]

Can you certify connections on the link above ? I'm about to test the +5V and I would like to connect the transformer correctly, because I'm not an expert at all with transformers []!

[The worst foe lies within the self]

[jzontek]

quote:Originally posted by Lulu
[br]Can you certify connections on the link above ? I'm about to test the +5V and I would like to connect the transformer correctly, because I'm not an expert at all with transformers []!

[The worst foe lies within the self]

I can tell with 100% certainty that I used this for the AMP5 to connect the Avel Lindberg model Y236759 transformer and it worked fine. In fact I have the picture taped to the wall to check the connections before I do further testing and troubleshooting.

It should work for all Avel Lindberg Y23 transformers, as they all share the same documentation. If you have a different manufacturer's transformer, then check things out before doing any connections.

I am a complete neophite to this stuff and this was the area that presents the most potential physical danger as far as I can tell. Thanks to the input from others here, especially Jan, I came up with the drawing on the link above. I then called Avel Lindberg, and after explaining the set up and the input from Jan, they said this is the right way to set it up.

I did make one change after blowing several 0.5A slow blow fuses. I moved the fuse to the secondary side. I did this after reading on the AMP5 forum that someone else had the same problem, and moving to the secondaries solved it for them. After doing this I have not lost a fuse, and tests have been successful.

When I finish all testing and install a larger fuse, I will also probaby move the fuse back to the primary side.

I hope this is helpful.



John Z

[Lulu]

What about the sector's connection (things with three 'pins' at te top left corner) ? Mine have "NEL" on each 'pin'. How can I recognize on which pin I must connect the black or white cable from my transformer ?

To ask more, here is my transformer :

Velleman 2x21V 300VA

<code>* primary: 1672 18AWG black - black : 1 x 230V / brown - brown : 1 x 110V
* secondary: *red - yellow / *blue - grey (* = start)</code>

Someone could explain me how to connect the transformer to the sector's element (sorry I don't know the english translation for that element). [)]

[The worst foe lies within the self]

[Lulu]

I guess mine have the same cable colors as yours, except for the VIO. If I try to connect exactly as you have done, will it be all right ?

It seems that the primary (black and brown) is the same as the Avel, and the secondary too (red/yellow, blue/grey).

An ackknowledgement, please ?

[The worst foe lies within the self]

[thomaseliot]

LULU, no, I don't think yours is like Avel transformer. Avel has two primaries 115 V each, while yours looks like to have also two primaries, but one is 230V (black-black), the other 110V (brown brown).

* primary: 18AWG black - black : 1 x 230V / brown - brown : 1 x 110V

Have you 2 black wires and two brown wires? Don't connect them each other!

Secondaries connections are clear from Velleman description:

* secondary: *red - yellow / *blue - grey (* = start)

yellow and blue must be connected together and put on PGND. Red and grey go one on AC1, the other on AC2, indifferently.