Need help with transformer

[wordsmith07]

I have an Oliver table saw that is world for 440V only. My shop has Delta 120/208 3 phase and I bought this transformer and plan to backfeed it ( step up) with my 220/230 to get as close to 440V as possible. It states that the connection is Dyn5. Is there any concerns I should be aware of?
Thanks for any input

 

[JimDawson]

Should work fine. No real concerns that I can think of.

 

[markba633csi]

I looked up Dyn5 and it just describes the phase relationship between input and output. Really only important if one is using several transformers in parallel, which I'm sure you are not
Using the 480 tap will probably be the closest to 440 when stepping up from 208
-Mark

 

[wordsmith07]

Thanks guys

 

[wordsmith07]

Thanks guys

Okay guys,
I had a serious burn accident that kept me out of shop for 2 months.
I hooked up the transformer and when I flipped breaker in panel there was a "flash" on ground bar side so I cut it off. Remembered where I read somewhere not to hook up ground in feed side so I disconnected the ground input to transformer and no arc when I powered it back up.
Checked the output voltage and it was close to 460 so I moved taps to 440 V lugs and all was good.
Saw runs great and pleased that it takes over a minute to coast to a stop.
Now that I am sure I can power it, going to strip it all down and rebuild bearings and reassemble
Hope there won't be an issue with no ground to panel....
Thanks for the help!!

 

[markba633csi]

Make sure you don't have a lethal voltage on the transformer case- that could be a bad situation. You should be able to ground the case without sparks. If you can't, you at least should build a box or cage around it for safety
When installing an unknown used transformer (or even new) one should test the winding resistance to the case before wiring it- should be a couple megohms or more
-Mark