I have seen 480 V delta high legs, but they were old and rare.

This machine sounds like it was designed to run on a 400Y/230 V system. You probably need a transformer. I use Bruce Electric in NY for those specialty transformers.

 

Yes you are right... after looking at the diagram it seems to be 240V 3 Phase with a stinger leg of 400V ... with both neutral and ground. Does this make sense? Kinda like the USA with the 208v and 240v stinger?

This machine is from eastern Europe. So they have said 3 phase 240V high leg (stinger 400V)

Would 1 transformer cover this? My feed is standard 480v Delta 3P

 

There is no such thing as 480V "high leg" delta; there is 480V delta or 480/277V wye. People outside of the US don't understand our distribution systems very well and make all kinds of ignorant statements.

Just because you have only 3 phases coming out of a distribution panel or MCC, doesn't necessarily mean you have 480V delta, it could be that the neutral was just not brought out because nobody was using it and they didn't want to waste money on the conductor for no reason, Whether you have a delta or wye service is relevant at the SERVICE ENTRANCE.

If their product is designed for 400V 50Hz in Europe or elsewhere outside of North America, then it is designed for a Wye system (they call it Star, same thing) where the L-N voltage is 230V. If their system MUST have no more than 230V L-N, then it is not suitable for use here in the US.

 

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After more communication. The equipment is from Eastern Europe. Our service is 480v Delta 3P

They are saying that this is 240V 3ph with a stinger leg of 400v (similar to some power I have seen here in the states with a high leg.) Yes.. this shows 5 wire total. 3 hots (2 normal, 1 high leg) 1 neutral and 1 ground. Can this be accomplished with a specialty transformer from my native 480v 3ph Delta? Any suggestions? Just a lowly Aeronautical Engineer trying to convey this between parties.

 

According to your profile it say " Engineer " .,

You should concant the equiment manufacter to see what they do with that machine to reconferaton to North Americian standard.

You can get this in Delta or Wye on 480 volts.

I dealt alot of both 400 and 480 volts equiments so I am pretty famuiar with it.

If your machinery do set up to work with 60 HZ source then it is not a issue but the only nice gotcha if you have VSD's then you need to pay attetion to them due the EU specs are set for wye ( star ) system so check the VSD installment and operation manual for details to work on 480 volts delta system.

If any reason why your equiment do need neutral then two way you can do this is run in wye supply otherwise Delta Y transfomer ( 480- 400/240 ) will do it.

Ya there is high leg delta but super rare and not being used anymore.

 

Thank you for your time. Yes aeronautical engineer who knows when he is out of his league. They do spec out a neutral. And yes I will check the VFD to see if they are good with 60hz (since their native is 50hz). Thing is I need to have the service in place before they come to install. So.. the Equipment is coming from Hungary .. I believe their service is 240V with a stinger leg @ 400V. So... can this be accomplished with one transformer when I am starting with 480V 3p Delta.?

They said 240V from A and C and 400V from B (high leg) to Neutral is 400v

 

If this machine requires a neutral, probably some of the controls or small loads were configured for 220 VAC 50 Hz. I have seen some European machines where for whatever reason, the neutral was connected to one end of the motor windings. The motors will work fine without this strange connection.

It sounds as if you will need to do some research with the machine vendor to determine, for certain, the power requirements. Also, verify the building electrical characteristics. A 480 volt high leg service is a very rare thing. Usually you have either (a) 480/277 with or without a neutral, (b) 480 corner grounded, 480 ungrounded or (d) 480 volt resistor grounded.

Usually, BUT NOT ALWAYS, a 50 Hz machine can operate on 60 Hz. Pumps and fans can be a problem due to their higher current draw at the higher 60 Hz speed.

Good luck.

 

Building Service American 60hs 480v 3P Delta

Equipment is from Eastern Europe 5 wire (2 @ 240V, high leg at 400V to N) and then Neutral and Ground Wire.

Question is how to replicate from my 480V 3P delta service. Any suggestions on a manufacturer who makes these?

There are electronic VFD's here that I am pretty sure are 50hz/60hz can you expand on the fact that if the pump is wound for 50hz we may have an issue even though we are running through a VFD?

 

I seriously doubt this machine NEEDS a 240 V delta with a 400 V high leg. I suspect that the supplier just THINKS this is how American electrical systems are.

I would definitely get on the phone with the person who knew the best English and get to the bottom of it. My bet is that it is designed to work on a 400Y/230 volt system that is standard across Europe. You will be hard-pressed to find a transformer to turn 480 volts into a delta with a 400 V high leg, but a 400 V wye is easy. I've bought 5 or 6 in the last 10 years.

 

I think you have enough posts now to put up a picture of the diagram you have so we can take a look at it.

 

Thank you Rephase I have to post 20 before I can insert a pic. Or link to a URL

i64.tinypic.com/2lvbrjk.jpg

 

We wired a project about a year ago with just about the same problem.
They brought in European braiding machines for an aviation application.
They had some compliance issues and just decided to bring in a electric generator that would give them the 50hz and the voltage they needed.
The generator was powered by a 480 volt electric motor. The output was fed into a separate panelboard and distributed to the machines.

It seemed a bit Rube Goldberg for me but, it's their money.

 

No that did not work.. anyway.. I will try my best to figure out how to post the diagram or upload it to another location.

This link works. ibb.co/cP2RSx

 

Continued from Manufacturer

If you use a high-leg delta connection (see the previous picture), you have 3 phase and 1 neutral and 1 ground. If you measure the voltage between phase and phase you get 480V. It is good, but if you measure the voltage between 1 phase and neutral you need to measure 240V. If you measure more you need to reduce the inlet 480V to 400V. Originally the iCPC works well on 400V, but each phase is no more, than 240V.

 

Solved

Thank everyone for their input. Finally got some kind of an answer. Was able to talk to someone else who had the install of the same equipment. The manufacturer got all confused because we have 480v 3 phase service as opposed to a lower input voltage. Although they maintained that this was a high leg delta transformer the one the customer in the USA is using is

480V 3P input >> 400VY/231 Out

Thanks for all the help. Just hoping that this actually works with the voltages and phases they said the machine was going to use originally.

 

Be interested in knowing what this machine does?

Swapping one motor, might be cheaper than the transformer route.