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Old 05-12-2008, 12:28 PM   #16
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3 Phase Converter Wiring


I'm trying to power a piece of used (3 year old) digital printing equipment. Currently, this is the only other info I have for the power specs:

Code:
 Between Neutral and:
Terminal    Voltage
 X               120 V AC
 Y               120 V AC
 Z               120 V AC
 G                   0 V AC
I will try to locate some specs for the power input but so far I have not found any. I also looked at the power output system located inside the machine but I have not seen anything that would help. It also has a breaker box and some fuses inside. I will take some pics of the inside and post them later today.

I will take some measurements for the output of the phase converter and post the findings.

I've wired a few printers in the past and the specs were odd but this one is by far the strangest...

Thanks again Guys!

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Old 05-12-2008, 01:19 PM   #17
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3 Phase Converter Wiring


I took the measurements and here are the voltage readings

L1 (black) - 120V
L2 (red) - 120V
L3 (blue) - 214V
Any other measurements needed?
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Old 05-12-2008, 01:30 PM   #18
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3 Phase Converter Wiring


Here are the photos from inside the machine. I don't think they will be any help but here they are.

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Old 05-12-2008, 08:08 PM   #19
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3 Phase Converter Wiring


This machine requires a 120/208 3 phase 4 wire wye connected system. A phase converter produces a 120/240 3 phase 3 wire delta system. If you add the neutral, you have a 120/240 3 phase 4 wire delta system. Hence, 214 volts from L3 to neutral. We call this one the high leg, wild leg, delta leg, and a few others I can't remember.

This machine will not work directly connected to a phase converter. It will work however with a transformer (I believe this was mentioned a few posts ago). This transformer would be 3 phase, 240 delta primary, and 120/208 wye secondary. Based on the nameplate, 9KVA would be the absolute minimum, I'd feel better with a 12KVA or 15KVA. The 15 will likely be easier to find.

With the transformer, you won't need the neutral from the building power system, the transformer makes its own neutral. You will need the phase converter though. Simply hook it up like a motor, the difference being the motor leads are T1, T2, and T3; the transformer primary leads will be H1, H2, and H3.

On the secondary side, XO is the neutral, and X1, X2, and X3 will all have 120 volts to XO, and 208 volts between any two. This is exactly what the machine wants.

If you haven't bought the phase converter yet, I'd go with a 15HP. 24 amps will be pushing a 10HP one pretty hard, but it'll probably work OK. A 15KVA transformer will be about (dimensions vary alot here) 24" high, 16" wide, and 12" deep, and weigh about 200 lbs.

I'm glad you posted the pic's, now we know what we're powering.

Rob
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Old 05-12-2008, 09:34 PM   #20
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3 Phase Converter Wiring


Quote:
Originally Posted by ideffects View Post
I took the measurements and here are the voltage readings

L1 (black) - 120V
L2 (red) - 120V
L3 (blue) - 214V
Any other measurements needed?
That's what I thought might happen, You would have a problem with this setup and those voltages.

Just get your isolation xformer and your golden.

I think we all learned quite abit with this post.

Keep us posted.

KC

Last edited by kencaz; 05-12-2008 at 09:37 PM.
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Old 05-13-2008, 03:27 PM   #21
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3 Phase Converter Wiring


Thanks guys!

I'm in the process of getting a transformer. I will let you know how it goes when it arrives next week.
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Old 05-26-2008, 05:46 PM   #22
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3 Phase Converter Wiring


I'm back. I got the transformer on Friday and I have a quick question for wiring it up. I just need to know which converter leg goes to each transformer leads and from the transformer to the receptacle. I am assuming it would be the following:

Converter -> Transformer
L1 -> H1
L2 -> H2
L3 -> H3
Ground -> Ground

Now the Receptacle
Transformer -> Receptacle
X0 -> W
X1 -> X
X2 -> Y
X3 -> Z
Ground -> G

Thanks again!
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Old 05-26-2008, 08:05 PM   #23
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3 Phase Converter Wiring


Quote:
Originally Posted by ideffects View Post
I'm back. I got the transformer on Friday and I have a quick question for wiring it up. I just need to know which converter leg goes to each transformer leads and from the transformer to the receptacle. I am assuming it would be the following:

Converter -> Transformer
L1 -> H1
L2 -> H2
L3 -> H3
Ground -> Ground

Now the Receptacle
Transformer -> Receptacle
X0 -> W
X1 -> X
X2 -> Y
X3 -> Z
Ground -> G

Thanks again!
Looks good, Just take voltages from the output to make sure before your wire the plug.

You should get 208V across either X1, X2 or X3, and 120V across X0, and any of the 3 legs. That should give you your 4Wire plus ground you need.

Good Luck

KC

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