Rotary Converter/ Haas VF2/ "T3" (Manufactured line)

[l u k e]

With a phase converter T1 and T2 (Supplied by the utility company) are supposed to be used to run all controls T3 is the generated line. Does anyone know which tap gets "T3" a, b or c?



The VF2 is an '08 if that matters.

[mniadna]

Doesn't matter

[mniadna]

One very important thing is to make sure your legs are balanced. Think they should be within 5% of one another.

[l u k e]

Originally Posted by mniadna Doesn't matter

Phase converter manufacturer said it does, the 3rd leg is not supposed to run controls.

I read (prior to the purchase a few years ago) that the manufactured leg needs to run certain parts of the machine; I just don't recall the info or where I read it.

[l u k e]

Originally Posted by mniadna One very important thing is to make sure your legs are balanced. Think they should be within 5% of one another.

My converter is balanced at 1.9% over all, checked it yesterday.
T1-T2> 0.9%
T1-T3> 0.7%
T2-T3> 0.3%

[JohnJW]

Originally Posted by l u k e Phase converter manufacturer said it does, the 3rd leg is not supposed to run controls. I read (prior to the purchase a few years ago) that the manufactured leg needs to run certain parts of the machine; I just don't recall the info or where I read it.

I think there's a 24V? transformer for the control power supply so I think it probably doesn't matter which leg is being used for it. However, there's a phase check led that will let you know if the 3 phase power is connected in reverse. If that happens you just switch two of the wires.

I would image if you can't use the 3rd leg from the phase converter for the control, you probably can't use it for the spindle drive either.

[l u k e]

Originally Posted by JohnJW However, there's a phase check led that will let you know if the 3 phase power is connected in reverse. If that happens you just switch two of the wires.

Yes, there is a "phase detect" light in the panel just left of the in comming power breaker.

[l u k e]

Here is some info from the install manual:
* "T3 is the manufactured line: DO NOT use T3 for any single phase loads."
* "Run all controls from lines T1 and T2.”

What I find a little interesting about this is even if I hire the HFO for $1000 or more to come out and level and start up the machine they do not mess with the wiring, (per my HFO). Therefore they would have no idea which leg is “T3” and would never check it.

If I hire an electrician I doubt they would even consider it and would never take the time to trace the wiring. I’ve called Haas for phase converter information (not for this) and was pawned off on a phase converter manufacturer. I haven’t called on this yet, I just figured the information would be here somewhere.

I did post this the phase converter forum and never got a reply post on it.

[mniadna]

The reason someone probably told you that is because the manufactured leg could have more harmonic distortion than the legs from the grid. It doesn't seem to be an issue, though. I have a Haas and a FADAL that run off of phase converters. I just balanced the legs and ran power to the machines. John is correct, except for the fact that phase orientation doesn't matter. My machine has a 12V regulated supply to power the "controls" and a VFD to drive the spindle. It would be impossible not to use the the manufactured leg to power any of the "electronics" in the machine. The only thing that statement could possibly apply to would be something like a 1980s CNC Bridgeport that doesn't have a VFD for the spindle.
Another thing that phase converter manufacturers seem to be incorrect about is their sizing. When I bought my first phase converter for my 15HP VF-0, I was told to double the spindle motor HP, or maximum combined HP of all motors. I ended up buying a 25HP converter for the machine. When I bought my 4020HT with a 20HP spindle, I bought a 30HP converter, only to find out that the 25HP that I already had would run both machines simultaneously. I have yet to hook up the 30HP converter... They tell you to oversize the converter, because as demand on the converter increases, the balance of the legs will change. Having an incredibly large converter will minimize this.

[haastec]

Originally Posted by l u k e Here is some info from the install manual: * "T3 is the manufactured line: DO NOT use T3 for any single phase loads." * "Run all controls from lines T1 and T2.”

If the only stipulation is to not use T3 for any single phase loads, then I believe any terminal should be fine because all three legs are routed through the internal transformer. From there the machine steps down any requirements for 115v.

[Donkey Hotey]

OK, I've resisted posting because this really is splitting hairs...

What year is your machine? The mid-2000s, white painted, Haas Vector Drives did have the control voltages internally tapped into A and C; B was the leg you would ideally connect to the generated leg.

I can't speak to the later brushed-stainless or black plastic vector drives, though I suspect they are similar.

To correct the phasing direction (if it fails the startup check), simply swap the outside two wires (A&C).

[l u k e]

Originally Posted by Donkey Hotey OK, I've resisted posting because this really is splitting hairs...

Why is it splitting hairs if I don't know the answer?

What year is your machine? The mid-2000s, white painted, Haas Vector Drives did have the control voltages internally tapped into A and C; B was the leg you would ideally connect to the generated leg.

2008