Need Help Replacing a 240v Mains Transformer - RESOLVED

Hi @rheadelwell

Here's a link to the power transformer wiring details that may help.

Here's an image showing how to connect the AC supply input to the power transformer for a single 240V AC input supply i.e. red, black, green wires (or brown, blue, green/yellow wires)

(click on image)

Note: make sure that all connections are well insulated using heatshrink tubing over the joint, and that any wires out from the transformer, that do not have any joins e.g. blu/yel and whi/blk are also insulated with heatshrink tubing and tied off and not loose, so that there is no bare metal showing out from the end of the wire insulation and that the wires can't move about for whatever reason, as these wires are live when power is applied to the transformer

@rheadelwell

If the 4th image you posted above is the new transformer it shows 6 wires presumably coming from the primary winding i.e. white with a blue stripe, white, blue with a yellow stripe, blue, black, and white with a black stripe and 6 from the secondary i.e. 2 x brown, 2 x red and 2 x green. So there's a total of 12 wires coming from the transformer

What make and model transformer did you get?

The schematic for the Hammond 290EEBZ (image of transformer model which you posted above) shows 7 wires connected to the primary windings, 6 wires connected to the secondary windings and a wire connected to the core or frame of the transformer i.e. earth connection, for a total of 14 wires.

The image in my answer above showed how the 3 standard wire colours used in most 240V power supply countries around the world i.e. red (Active), black (Neutral), green (Earth) wires (or brown (Active), blue Neutral), green/yellow (Earth) wires) would be connected to the wire colours as shown by the Hammond 290EEBZ data sheet.

This is of course if the new power transformer is a Hammond 290EEBZ model as shown in the 1st image you posted.