Transformer Identification

[Jerry Hill]

My transformer theory is very weak. I have a transformer with multiple primary inputs. This transformer is out of a discarded 0-60V 1.5A bench power supply. I want to use it for a battery charge, discharge and test system in my shop. The bench power supply came with a feature to use it with selectable VAC inputs, i.e. 100, 120, 220 & 240 VAC, therefore there are several primary inputs i.e. wht 0V, blu 100V, yel 120V & gry 0V, grn 100V and red 120V. It also have 2 pair of taps on the primary side marked as 8V on both. The secondary has a yel 0V, org 15V, wht 35V & a red 64V. With a 120VAC input on the wht 0V & yel 120V primaries I get the desired outputs. I also get a 120V voltage reading on the second primary. Can this second primary be used as a semi-isolated source for controlling timer relays?:-? :-?

 

[LarryFine]

Probably so, but you may only halve the ampacity of the supply, as I'm sure the primaries are intended to be connected either in parallel or series. If it were me, and I needed an isolated 120v., I'd use a separate 1:1 transformer.

 

[Jerry Hill]

Thanks, I kinda figured that. As I have several of these transformers I've decided to put a couple back to back, primary-secondary-secondary-isolated primary. Again, Thanks for the response.
Jerry