[sdiy] Ax 80 mains transformer

[Ingo Debus]

Am 02.09.2012 um 23:12 schrieb John Henson:

> This AX has windings for 100, 110, 220 and 240 Volts so there are a lot of primary windings. For safety during first power up, I would like to rewire it for 240 VAC (in Ireland we use 230V but it should work. The available online manual shows no details of the mains switch wiring.
> I have measured all the primary windings and have come to a possible wiring solution for 240V.
> Grey is Live, join Orange and Yellow to connect the 2 sets of primaries and Blue as Neutral. Has anyone out there had to do this or have any insight into the trafo wiring?
> My scenario would seem to give the highest primary resistance which I can only assume is for 240 Volts.

To be safe, you could first power the transformer with a much lower voltage, say 24 volts from another transformer. The output voltages should scale down more or less accordingly.

Ingo