I have a welding machine that contains a little transformer going directly to a relay that allows the voltage to pass through the SMPS to the main board then to the DC transformers directly to the + and - outputs of the welder .
Now as soon as i turn the machine on i don't hear any relay clicking , that's why i want to check it , i am just wandering what is the safest input voltage i should put in ?? and should it be DC or AC , just to avoid any damage on the transformer ( if its still good ).
Here is the transformer :
**broken link removed**
And the thing that i don't quite understand is how could that relay be energized if there is already no voltage attenuation to the card containing the transformer