Re: [CAD_CAM_EDM_DRO] Dual purpose power supply

The centre tap is connected to mains earth so you can use the transformer
without any mods whatsoever. Use a 2 diode full wave rectifier with mains
earth as the common.

From the OUTPUTS of the transformer:

L----|>|-------------------DC positive
|
N---|>|------------

E-------------------------DC negative

The diodes need to be rated for at least 300V and 1.5x the output current.

The output voltage will be about 80V on load and at a guess about 90V off
load. Can your drives handle this?

DISCLAIMER: I have not done this myself. Check the site transformer is not
an autotransformer type (it shouldn't be).

Les

> Hi,
>
> You can use a yellow site transformer (the larger the better) designed for
> running 110 volt tool such as drills and saws. These are centre-tapped 59
> volts AC transformers. Remove the transformer from the box and cooling

oil,

> spilt the centre-tap and then treat as two 59 volt transformers.
>
> It is possible to join them together in parallel, thus doubling the
> available current. By the time you put rectifiers and caps it should be
> quite near 70 volts DC.
>
> I'm using this system to build a large supply to run my servos via Gecko's
> on my BP clone.
>
> Regards,
>