losing work coordinates at power off

[jlong58]

I've been working on a machine with a fanuc o-m controller for about a week trying to get it up and running. We got this machine from another plant in our corporation, and nobody in house really knew a whole lot about it. With the help of some members here, and a whole lot of reading in the archives, I have almost all of the issues ironed out.
One thing I haven't yet figured out is that when we power down the machine, and then power it back up, it loses its work coordinate settings. They don't go to zero, they just seem to randomly change. Tool length settings are fine, it's just the work coordinates.
Does anyone know how to correct this? I suspect there may be a parameter that needs to be set, but I don't know what it is.

[ChattaMan]

Do you mean work offsets? Which page are you viewing to see your "work coordinates"
If you are viewing the "Relative" page then yes these will not be stored at power off.
You should have your "work coordinates" set in the Offset page

eg.

SHIFT(00) G55(02)

X.............X.........
Y.............Y.........
Z.............Z.........


G54(01) G56(03)

X.............X.........
Y.............Y.........
Z.............Z.........


HTH

[jlong58]

no, I'm losing my g54 absolute coordinates

[tobyaxis]

Originally Posted by jlong58 no, I'm losing my g54 absolute coordinates

That is what he meant.

Have you checked the Memory Battery Yet?

[jlong58]

yes I have replaced the batteries. It didn't make a difference.

[tobyaxis]

Originally Posted by jlong58 yes I have replaced the batteries. It didn't make a difference.

Do you have the Machine Tool and Control Manual?
There is a Diagnose Page where you will have to read the bits. If you can find that Parameter then write down the Bits after setting the G54, Kill the Power to see what changed.

This is most likely a question for Al_The_Man, he would know.

Sorry I can't be of better help.

[timlkallam]

Are you using g92 g54 x0y0 to set your coordinate.
If you are using the g92 preset it is cancled after power down thus losing your position.

[saulij]

We are using G10 command in start of every program. It sets work coordinates every program run.

G90G10L2P1X....Y....Z..... for G54
G90G10L2P2X....Y....Z..... for G55
.
.
G90G10L2P6X....Y....Z..... for G59

BR

Sauli

[Al_The_Man]

I am not sure I am understanding this, if you reference the machine at start up and you are registering a G10 position for the work coordinates in the program , what is missing?
As you should be automatically re-registering the work co-ordinates when you run the program.
Al.

[saulij]

Different pieces have different fixtures or different place in fixture (vise), so the work coordinates (offset from reference point) are different also. That’s why we are setting the work coordinates in the program. There is no matter, what happens: electrical interrupts, shutdown, do other job, push wrong button… whatever. If you have a right program for current job, you always have right offsets.

We have several CNC machines (Fanuc and Siemens) and we have used this method in all of them for many years.

[Al_The_Man]

Originally Posted by saulij Different pieces have different fixtures or different place in fixture (vise), so the work coordinates (offset from reference point) are different also. .

Sorry, I was getting you mixed up with the original poster and thought he was using your method and it was not working.
I agree this should be the way to go.
Al.

[jlong58]

I think Timlkallam may have answered my question. I am setting the work offset by moving to the location, and then going to MDI and typing G92 x0yo. If I understand correctly, that method will be cancelled at power off. Is this correct? If so, I will simply set the offsets manually.