Re: [CAD_CAM_EDM_DRO] Re: welding machine as a power supply

ibewgypsie wrote:

>Probably, the best thing would be 3 smaller individual transformers. I
>got one large 2kva 220/24+24=48(dual tap) transformer and it weighs
>about 50 pounds. It cost about $200 Local. Problems with one large
>transformer is the bridge, you want to use a 35amp 600 volt cube for
>simplicity. I have lost 3 of them in a year. When the capacitors are
>discharged and you hit the go relay and throws power to the drives,
>charges the capcitors (looks like a short for a second) it fries the
>cube one time outa a hundred. I tried dual switches that would charge
>the capacitor bank half wave but quickly tired of it.
>

You can connect a couple Ohm resistor between the bridge and the
capacitors. Have a time-delay relay short the resistor after one second.
This will reduce the power-on surge by a factor of 100 or so.

Jon