Siemens Transformer

[ADELECTRICWORKS]

hi,
i am providing a power to x-ray machine. i need to add a step up transformer. clinic has a step down transformer. i just want to know if i can use it as a step up. we are getting line to line 208, line to neutral 110.
machine requires 380/400/440/480vac 3 50/60hz
i am attaching the transformer specs.
if there is a way, can you please share a diagram.

thank you

 

[Dsg319]

Running it backwards with delta secondary will lead you to different grounding then most are use to.

 

[ADELECTRICWORKS]

i can use x1,x2,x3 and x0 neutral as primary input (208/110)
h1,h2,h3 as secondary, should i keep 1,2,3,4,5,6,7 on h1,h2,h3?
how can i get neutral on load side, or 277 line to neutral?

 

[ActionDave]

i can use x1,x2,x3 and x0 neutral as primary input (208/110)
h1,h2,h3 as secondary,

Electrically speaking, yes you can. The transformer doesn't care if you are connecting the low side to a power source and the high side to a load. You don't connect anything to the XO when you "reverse feed"

should i keep 1,2,3,4,5,6,7 on h1,h2,h3?

Those are taps to different spots on the transformer windings to adjust you voltage output.

how can i get neutral on load side, or 277 line to neutral?

You can't with that transformer. You would need to get a delta primary, wye secondary step up transformer, which is what I would encourage you to do. While it is possible to reverse feed a transformer it presents some problems if the load being connected needs a neutral. You also end up either needing to corner ground the delta or installing ground fault detectors to have a code compliant installation.

 

[infinity]

i can use x1,x2,x3 and x0 neutral as primary input (208/110)
h1,h2,h3 as secondary, should i keep 1,2,3,4,5,6,7 on h1,h2,h3?
how can i get neutral on load side, or 277 line to neutral?

You would not use a connection on the X0 for the Wye primary which would be 208 volts only. Since there is no neutral the primary is not 3Ø, 4W, 208/120 it's just a 3Ø, 208 volt supply.

As Dave stated this is the wrong transformer if you need 480/277 on the secondary.