Transformer connections.

[darekelec]

Hello everyone.
I have a piece of machinery from Europe that needs 460V 3 phase 29.5A (Amada hft 100-3 S).
GC already furnished me with a transformer - nameplate in pics.
My supply voltage is Y 120/220 V grounded system.
How can I make this transformer to work?
I do not want to go into expense of swapping the transformer or ground detectors.
I am sure the machinery has tolerance for voltage so if i can get it close that would be great.
Thank you in advance for your input.

 

[templdl]

Hello everyone.
I have a piece of machinery from Europe that needs 460V 3 phase 29.5A (Amada hft 100-3 S).
GC already furnished me with a transformer - nameplate in pics.
My supply voltage is Y 120/220 V grounded system.
How can I make this transformer to work?
I do not want to go into expense of swapping the transformer or ground detectors.
I am sure the machinery has tolerance for voltage so if i can get it close that would be great.
Thank you in advance for your input.

Is there a reason that you omitted the complete transformer information such as what the primary of the transformer is and where there transformer is located in the distribution system. Given the limited information that you have provoded you have no choice but to purchase a transformer with a 240v details primary to 480y/277 secondary.
If you tell us about you electrical distribution system, what your SE is, where the transformer is that supplies the 240/120 3ph4w (please note that there is no 120/220v wye that exists. This is incorrect).
Thanks

 

[iwire]

Hello everyone.
I have a piece of machinery from Europe that needs 460V 3 phase 29.5A (Amada hft 100-3 S).
GC already furnished me with a transformer - nameplate in pics.
My supply voltage is Y 120/220 V grounded system.
How can I make this transformer to work?
I do not want to go into expense of swapping the transformer or ground detectors.
I am sure the machinery has tolerance for voltage so if i can get it close that would be great.
Thank you in advance for your input.

First off are you sure you have 220 not 208 volts?


You could supply this transformer with 3 phase, no neutral. You would connect the 220? to X1, X2 and X3. XO would remain unused.

The output would be H1, H2 and H3. I would bond H2 to ground so I would have corner grounded 480 delta.

Keep in mind you will not get a neutral out of this arrangement, just straight 480 3 phase.

 

[Sahib]

If your line voltage is 220v, your phase voltage is 127v and not 120v. If your voltage is high, adjust the transformer tapping to provide correct voltage to your machinery.

 

[infinity]

If you're in NYC it's almost certainly 208Y/120 volts. You can reverse wire the 480-208Y/120 transformer to create 480 but you'll need either a grounded Delta or ground detectors. Or have the GC supply the correct Delta/Wye transformer.

 

[darekelec]

The utility company here supplies 220V to more industrial or bigger apartment buildings. I was surprised too.
I took a reading recently for elevator guy on one project at service with fluke t5-600 with full building load on and it was;
A-B 217V
A-C 216V
B-C 216V
A,B,C to N 125V each

They do it probably not to fuzz with voltage drop.

I'm gonna make it delta corner grounded system.
Now I only have to research the OCPD and enclosure for it. Will I need it to be 2 pole 480V straight breaker or fuse? Whichever is easier to get.

 

[mivey]

The utility company here supplies 220V to more industrial or bigger apartment buildings. I was surprised too.
I took a reading recently for elevator guy on one project at service with fluke t5-600 with full building load on and it was;
A-B 217V
A-C 216V
B-C 216V
A,B,C to N 125V each

They do it probably not to fuzz with voltage drop.

I'm gonna make it delta corner grounded system.
Now I only have to research the OCPD and enclosure for it. Will I need it to be 2 pole 480V straight breaker or fuse? Whichever is easier to get.

That is 120/208 nominal wye. Your voltage is just on the high side but still acceptable.

 

[infinity]

That is 120/208 nominal wye. Your voltage is just on the high side but still acceptable.

I agree, my nominal system voltage here is 120/240 but if I measure it at the service disconnect of my panel it's about 124/248 volts.

 

[templdl]

The utility company here supplies 220V to more industrial or bigger apartment buildings. I was surprised too.
I took a reading recently for elevator guy on one project at service with fluke t5-600 with full building load on and it was;
A-B 217V
A-C 216V
B-C 216V
A,B,C to N 125V each

They do it probably not to fuzz with voltage drop.

I'm gonna make it delta corner grounded system.
Now I only have to research the OCPD and enclosure for it. Will I need it to be 2 pole 480V straight breaker or fuse? Whichever is easier to get.

That makes a lot more sense.
If this is true and you appliance requires 120/240 1 ph3w then 208y/120 or 216y/127 still is an issue being that 216 is too low L-L and 127v is greater than 120. You mat have to purchase a 208v- 120/240v 1ph transformer.

 

[Smart $]

If your line voltage is 220v, your phase voltage is 127v and not 120v. If your voltage is high, adjust the transformer tapping to provide correct voltage to your machinery.

It appears to be a nominal 208/120V 3? 4w supply with voltage running a tad high. Changing the reversed-primary voltage taps is an option.

The question here is is whether the 460V nameplate rating is for a 460V nominal supply voltage... or similar to our NEMA rated equipment, expecially motors, which spec 460V but are in fact designed to be connected to a nominal 480V supply.

 

[jumper]

I would have thought a European machine would be 415V/3P/50Hz.

 

[templdl]

That makes a lot more sense.
If this is true and you appliance requires 120/240 1 ph3w then 208y/120 or 216y/127 still is an issue being that 216 is too low L-L and 127v is greater than 120. You mat have to purchase a 208v- 120/240v 1ph transformer.

Forget this post. I got this confused with another as these strings get so long. Thanks for ignoring it.
What I was getting at in my first post is we know nothing about the SE and/or what the primary of the 208y/120 secondary transformer is. Could we take a wild guess that the transformer is a common 480d- 208y/120 transformer being feed from 480y/277? As such would there be 480v 3ph in the facility already?

 

[Smart $]

Forget this post. I got this confused with another as these strings get so long. Thanks for ignoring it.
What I was getting at in my first post is we know nothing about the SE and/or what the primary of the 208y/120 secondary transformer is. Could we take a wild guess that the transformer is a common 480d- 208y/120 transformer being feed from 480y/277? As such would there be 480v 3ph in the facility already?

Could be. We generally assume when someone wants to transform one configuration to another configuration, that no other configuration is reasonably available... :blink:

 

[darekelec]

Specs for transformer (nameplate) are in thumbnail picture under my initial post. Just click to enlarge.
You guessed it right - it is 480V delta to 208Y/120V secondary. 30 KVA. with 7 taps on delta side.
I will reverse it and ground h2.
After install I'll adjust output voltage with taps. Not sure for what voltage exactly - 460V or 480V.

On machinery it says
Amada Europe S.A. (address in paris)
hft 100-3 S
460V 60Hz
29.5A
phases 3
and some other irrelevant data

I would greatly apreciate if somebody directed me what kind of ocpd to buy that is widely available. I think I need 40 Amp 480V straight rated 2 pole breaker or fuses with enclosure but my google search does not help me.
Can I use regular disconnect with fuses?

 

[augie47]

........................................
Can I use regular disconnect with fuses?

I think that would be the simplest route.

 

[darekelec]

the disconnect and fuses have to be 600V rated

http://forums.mikeholt.com/showthread.php?t=140756

problem solved.

 

[texie]

the disconnect and fuses have to be 600V rated

http://forums.mikeholt.com/showthread.php?t=140756

problem solved.

There are a number of finer points to comply with when doing a corner grounded delta. You might want to take a look at this great piece by Square D: http://static.schneider-electric.us...n/Molded Case Circuit Breakers/2700DB0202.pdf