Needing 208V on a High leg delta service

[Jimbobwey]

I couldn't find the option to add pictures earlier. LOL

 

[CoolWill]

Maybe I'm being paranoid.

Maybe, but as long as the check clears, put in as many transformers as they want.

 

[retirede]

That 235 is under the label heading “Short Circuit Current Rating”. I can’t say I’ve ever seen that before.

 

[MTW]

The spec sheet shows several voltages, Have you looked at the machine connection points?

Does it have an internal transformer or jumper straps setups? it even show a single phase listing.

Does it have a neutral or common terminal connection, that might indicate it needs a wye supply connection.

Have you called the machine supplier/vendor and asked about whether it can accept a 240V center tapped delta system?

First thing I would do is look at the internal connection points and see if it has options in there.

Does that manual have the schematic shown in it, that it lists on the machine tag?

 

[Jimbobwey]

Which is the same as the diagram I posted above, but with in and out properly labeled.


The only difference being the LV windings are wired in series instead of in parallel.

When boosting, this increases the boost; when bucking, this increases the buck.


I agree with these statements.

 

[Jimbobwey]

Which is the same as the diagram I posted above, but with in and out properly labeled.


The only difference being the LV windings are wired in series instead of in parallel.

When boosting, this increases the boost; when bucking, this increases the buck.


I agree with these statements.

In these configurations either Fig. CC or EE does it matter which phase is the high leg? In my current situation my high leg is Phase 3.

 

[eric stromberg]

Is this equipment built in Europe? The voltage there is 400/230. 230 Line - Neutral.
The nameplate shows 1 phase. Best way of getting this is from an autoformer 277-230, or 120-230.
You can also get a 1:1

 

[jim dungar]

I would check with the manufacturer.
The nameplate looks just like a typical motor: rated 230V and intended to be used on a nominal 240V system.
It also looks like they are expecting to see a system tear has a neutral, even though it is not brought to the equipment. They may have restrictions for a 240/120V 3ph 4w high leg system.

 

[eric stromberg]

You can also get a 1:1 transformer and use an appropriate tap. 2.5%, or 5%

 

[Jimbobwey]

The spec sheet shows several voltages, Have you looked at the machine connection points?

Does it have an internal transformer or jumper straps setups? it even show a single phase listing.

Does it have a neutral or common terminal connection, that might indicate it needs a wye supply connection.

Have you called the machine supplier/vendor and asked about whether it can accept a 240V center tapped delta system?

First thing I would do is look at the internal connection points and see if it has options in there.

Does that manual have the schematic shown in it, that it lists on the machine tag?

It can be ordered in 3 different ways. This machine delivered is set for the middle option 208/230 3 phase

no neutral needed

 

[winnie]

As far as the transformers are concerned, it doesn't really matter which phase is the high leg.

Anything that cares about Line-Line voltage will be happy with what you get out of the transformers.

The only thing that will matter is if there is something in your machine that cares about line-ground voltage. The spec sheet doesn't mention any restrictions, but if you have VFDs anywhere in the mix, dig deeper.

 

[CoolWill]

You can also get a 1:1 transformer and use an appropriate tap. 2.5%, or 5%

A 1:1 transformer would have to be sized to handle the full 12 kW, would it not?

 

[eric stromberg]

I run into this all the time. Using European equipment on US voltages. It's not just voltage. It's L-L vs L-N.

 

[eric stromberg]

Yes, a 1:1 would have to be rated fully. 210.9 talks about branch circuits from autoformers. Fact is, it is either L-N to L-N or L-L to L-L. They are not allowed to be used L-L to L-N

 

[MTW]

I run into this all the time. Using European equipment on US voltages. It's not just voltage. It's L-L vs L-N.

That's what I was asking him, has he looked at the terminal connections? Does it have a neutral termination point. If It has aVFD internally, Those normally require a wye system feeding it. If It just has heaters and a fixed speed blower motor the buck boost setup will work.

 

[Jpflex]

I've got 2 T111683 transformers that should be able to accomplish this. Looking for worrying help.

Service is High leg delta
Phase A - neutral 120
Phase B - neutral 120
Phase C - neutral 208
245 between all phases

Equipment needs
3 Phase 208-230V 12kW

Thanks in advance

Your primary voltage is likely too high so youll need to set the taps at the trabsformer for the higher primary voltage to yield a lower secondary voltage you are targeting

 

[zbang]

Have you called the machine supplier/vendor and asked about whether it can accept a 240V center tapped delta system?

^^^^^^^^^ that's the first thing to do ^^^^^^^^

 

[LarryFine]

In these configurations either Fig. CC or EE does it matter which phase is the high leg? In my current situation my high leg is Phase 3.

I would keep the high leg in the middle for symmetry's sake.

 

[Jimbobwey]

I would keep the high leg in the middle for symmetry's sake.

Thank you

 

[Jimbobwey]

That's what I was asking him, has he looked at the terminal connections? Does it have a neutral termination point. If It has aVFD internally, Those normally require a wye system feeding it. If It just has heaters and a fixed speed blower motor the buck boost setup will work.

Thank you but no it has no neutral connection point.