Power transformer question

[duende]

I bought this power transformer to power a symmetrical regulated psu board, on the datasheet i read now that i can't use the 2 secondaries separately , i don't understand why ?

https://www.mouser.fr/datasheet/2/410/VPT30_1670-781634.pdf

I have to connect red to orange to obtain 0V, and 2x15V at black and yellow, it's ok ?

If i use separate secondaries windings what happen ?

The problem is that the regulated board i've bought is in reality a 2x15V and not a +15/-15V,

https://www.audiophonics.fr/fr/alimentations-regulees/module-alimentation-a19-2x320v-lt1083-p-4381.html

So is there a problem to connect red to orange to ac ground 1 and ac ground 2 ?

And to obtain a symmetrical psu i have to connect DC +15V 1 to ground +15V 2 ?

It's not really clear for me.

Thanks.

 

[Khron]

Since that regulator board has separate AC inputs, might as well connect the secondary windings separately to it, and indeed, you'll have to connect the positive of one DC output to the "ground" of the other one.

Just make 100% sure the two power supplies on that board are indeed entirely isolated from each other, before connecting the outputs together.

 

[abbey road d enfer]

I bought this power transformer to power a symmetrical regulated psu board, on the datasheet i read now that i can't use the 2 secondaries separately , i don't understand why ?

Well, it doesn't say you can't. 
Actually, I think what they mean is that a single winding cannot handle all the power, it must be shared between windings. Failure to do so would probably unbalance the magnetic field. So, assuming the current draw on both sides is similar, you should be all right.

 

[duende]

Thanks everyone, it's what i had planned  to do at first... but now i have no doubt.

So finally it's more a language problem  I have to work engligh...

Thanks.

 

[gridcurrent]

there may be more to the subject.

Hammond also has a line of transformers that state all windings must be used.
https://www.hammfg.com/electronics/transformers/power/162-164

yet they offer similar products with no such warning including their version of the "Flat-Pack".

 

[CJ]

they were probably afraid that some joker  would try to get 3.67 amps off each secondary, thereby doubling their power for free but there is no free lunch in physics.

just divide by 2 if you want to use the windings individually so like 15 VAC at 1.5 amps each secondary.