220 delta required from 480 not sure if 480 is wye or delta for transformer

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Fordean said:
I do see references 380/220 But i checked motors They have 380/220 380 high 220low
They all tapped for low?
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The motors are designed to be connected in wye for 380V or in delta for 220V, and the equipment manufacturer could use either. You just need to match what the manufacturer configured things to be. The fact that there is an inverter involved is also an important clue; you need to match the voltage class of that inverter.

When a piece of equipment says it needs ' Power: 4P, 380/220V, 50/60Hz; ' I read that as requiring 380V L-L _and_ 220V L-N. But it might be the case that the machine really can use one or the other. All I have to go on is a spec on a web page probably translated from Chineese.

-Jon
 
Fordean said:
I have attached the picture of the machinery, Its from Japan, Wired for USA supposdly, 220 Delta
I have a 480 delta to 208 wye transformer quoted. 75KVA, I will fuse disconnect at 150 amp LPJ. And a small sub panel next to it.
I also have to feed a 30 amp 3ph 208 volt compressor.

Is the 208 volt secondary ok for this machinery. 208 wye type? I dont know if the 480 is wye ok on this setup.

Largest motor is 220vDelta/380vwye 60 hz 18.5 Kw 62/36 A 92.4 Eff%
Also, Motor control center that came with unit. Has no label showing what power requirements. I opened all motors and add up amps.
Looked at gauge of wire going to main switch. And put this together. Guys from Japan wont communicate. Except to say its 220v, I opened all motors and it is wired 220v.
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Not from Japan, it's from Shanghai, China, built to Chinese specifications and standards, many of which are outdated and not in step with the rest of the world, but they don't care, it becomes YOUR problem once they ship it.

I would not supply this with 240V Delta such as your MGM transformer. Most likely the reason why they are saying "50/60Hz" in the machine specs is because all of the motors have VFDs on them, so the incoming frequency becomes irrelevant. That being the case, the actual line voltage is somewhat irrelevant because VFDS can limit the output voltage to whatever they are programmed for, but they will be EXPECTING that 220V to have a solid reference to ground, as in a 220V Wye, not 220V Delta. Using a Delta secondary will likely result in the premature death of the already barely functional cheap no-name Chinese inverters that will come on the machine and you will find yourself replacing them in a matter of months. Get a transformer with a 240Y138V secondary, often sold as a "Drive Isolation Transformer". You will never use the 138V of course, but it is the grounded secondary that the Chinese VFDs will need to see.
 
Jraef said:
Not from Japan, it's from Shanghai, China, built to Chinese specifications and standards, many of which are outdated and not in step with the rest of the world, but they don't care, it becomes YOUR problem once they ship it.

I would not supply this with 240V Delta such as your MGM transformer. Most likely the reason why they are saying "50/60Hz" in the machine specs is because all of the motors have VFDs on them, so the incoming frequency becomes irrelevant. That being the case, the actual line voltage is somewhat irrelevant because VFDS can limit the output voltage to whatever they are programmed for, but they will be EXPECTING that 220V to have a solid reference to ground, as in a 220V Wye, not 220V Delta. Using a Delta secondary will likely result in the premature death of the already barely functional cheap no-name Chinese inverters that will come on the machine and you will find yourself replacing them in a matter of months. Get a transformer with a 240Y138V secondary, often sold as a "Drive Isolation Transformer". You will never use the 138V of course, but it is the grounded secondary that the Chinese VFDs will need to see.
Click to expand...
 
Jraef said:
Not from Japan, it's from Shanghai, China, built to Chinese specifications and standards, many of which are outdated and not in step with the rest of the world, but they don't care, it becomes YOUR problem once they ship it.

I would not supply this with 240V Delta such as your MGM transformer. Most likely the reason why they are saying "50/60Hz" in the machine specs is because all of the motors have VFDs on them, so the incoming frequency becomes irrelevant. That being the case, the actual line voltage is somewhat irrelevant because VFDS can limit the output voltage to whatever they are programmed for, but they will be EXPECTING that 220V to have a solid reference to ground, as in a 220V Wye, not 220V Delta. Using a Delta secondary will likely result in the premature death of the already barely functional cheap no-name Chinese inverters that will come on the machine and you will find yourself replacing them in a matter of months. Get a transformer with a 240Y138V secondary, often sold as a "Drive Isolation Transformer". You will never use the 138V of course, but it is the grounded secondary that the Chinese VFDs will need to see.
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They have some videos of their machines on YouTube. I watched a couple. Pretty well thought out machines. At least mechanically.
 
Jraef said:
Not from Japan, it's from Shanghai, China, built to Chinese specifications and standards, many of which are outdated and not in step with the rest of the world, but they don't care, it becomes YOUR problem once they ship it.
Click to expand...

I agree with your basic points about the machine and its specs. However I think that it is still up in the air weather the machine requires 220/139V wye or 380/220V wye.

-Jon
 
Here is an example of a transformer that was used on a bridge mill requiring 220V . Building service was 208V that ran a little high. Has extra taps that makes the adjustment straightforward. The manufacturer required an isolation transformer for their equipment.
Trans Tag 240-208 7 taps.jpg
 
winnie said:
This!

The unit is not designed for 220V. It is designed for 380/220V, which as synchro says means 380V wye 3 phase power.

The sort of transformer that he suggests is the simplest approach. I would confirm with the manufacturer that the unit is suitable for use at 60Hz, however if the main motor is controlled by an inverter than this is very likely the case.

-Jon
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I think it is nothing more than a motor designed to connect windings in delta for 220 volt supply or wye for 380 volt supply.

More common nominal systems today would be 240 or 416 for such an item.
 
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