Newbie- Haas FV2

[jstucken]

Hey Everyone.

Well i have been a member of this board for about 2 months now. I haven't made my appearance till now haha. I just bought a 1995 VF2 to put in my home shop. I work night shift at a local machine shop and help dad farm. I have been doing work on the side. So i bought my fist CNC. I know you guys will be here to help me on the way with questions and stuff so i thank you now. My one main question right now is. The computer to machine hookup. It takes a 9 prong to a 25 prong right?? Just wanted to make sure this was the same for my older machine. This machine came out of a shop runing when taken out. So all i should have to do is just hook up the air and electric and bee good to go right? I have check the three leads coming into the breaker box and the three hot wires check read:Line 1-120V, Line2-120V and Line3-225V. Is this right? I thought they should all be around 230. Is there anything else i should know?? Any help would be great.

Thanks Justin Stuckenschneider

[Geof]

Originally Posted by jstucken ...So all i should have to do is just hook up the air and electric and bee good to go right? I have check the three leads coming into the breaker box and the three hot wires check read:Line 1-120V, Line2-120V and Line3-225V. Is this right? I thought they should all be around 230. Is there anything else i should know?? Any help would be great. Thanks Justin Stuckenschneider

Good to go??? Not with those voltage readings.

Do you have a three phase supply or are you using a phase converter?

You should get the same reading line to line, 230 +/- 5 or 10%; Haas does not need the neutral just the three phase lines.

Something is wrong somewhere in your supply; I think if you hooked up the machine you would get a phase alarm because they have to be the same within 10% or something like that.

[Donkey Hotey]

You need to go back and measure line-to-line, not to ground. I think you have Open Delta wiring supplying your three phase. It'll probably give you three equal readings if you measure leg-to-leg.

I don't know if a 1995 machine is different but the newer ones will run just fine on open delta wiring. Mine is on a phase converter and I end up with similar values if measured to ground.

[jstucken]

I went out too the shed before work lasnight and recheck the three leads. And from line 1 to line 3 it read 244.4V 1 to 2 249.3V and 3 to 2 253.3 SO looks like i should be ok.
Thanks Guys.

[Donkey Hotey]

That's what I figured. Now you should either call Haas or somebody else here should chime in: can a 1995 machine run on open-delta wiring? My guess would be 'yes' but you should be sure.

You still need to have a very good ground, at least the gauge of the wire used to connect the power. What open-delta wiring means to you (the operator) is that if ground is lost, the cabinet will be at about 115V and could electrocute you. It could also very likely damage electronics.

I'm not trying to scare you. As I wrote above: my 2004 VF-2 is running just fine on open delta. But it's not as forgiving of electrical mistakes.

[Geof]

Originally Posted by Donkey Hotey .. Now you should either call Haas or somebody else here should chime in: can a 1995 machine run on open-delta wiring? My guess would be 'yes' but you should be sure.....

Chime, chime.

Yes is the correct guess; 1995 lathe runs that way.

Ground wire is supposed to be same gauge as line, many cables have a smaller gauge ground so you may want to run a separate larger gauge.

[jstucken]

Hey...

On our other breaker box in the shed we have a copper ground wire running outside and down into the ground about 3 or 4 foot. This wire is approximately 1/4 inch. So i don't know what gauge that is but it is bare wire. This is for our 220 voltage single phase. Can we just tap into the other breaker box and run the same size copper wire to the new box that has the 240 volt 3phase, or should we run a seperate ground for it.?? equal too or bigger than the leads coming in. The 4 leads coming in are 3 gauge I think. The wire i have to run to the machine is 8 gauge.

Thanks Guys.

Justin

[gar]

080518-0824 EST USA

jstucken:

Whether you have an open or closed delta does not matter and HAAS will work with either. What you have is a delta with one center tapped secondary for your single phase circuits. You may or may not have an open delta. If there are two transformers on the pole, then it is open delta. If 3 transformers, then it is a closed delta.

The center tap is neutral for the single phase circuits and is bonded (connected) to the safety ground wire (equipment grounding conductor, EGC, green wire), and earth ground. All three are bonded at the main breaker box (service entrance). From this common ground point every piece of equipment must be connected thru its own EGC. Neutrals must never be connected to EGCs anywhere except at the main breaker box.

Effectively your delta is floating off of ground, but with a fixed relation to ground determined by the center tapped secondary.

Also all metalic piping and metal building components must be connected at the main panel to the common EGC.

The basic requirement is that there be low impedance paths so that if you short a hot wire to something conductive that this produces a high enough current to trip the breaker or fuse protecting that circuit.

You need to provide more complete information on your neutrals, EGCs, and breaker box connections.

.