Need Help!- V20 fanuc 0m

[Scottjit]

We have a V20 0m with a 2 pallet system. The machine works correctly but the pallet has not worked in 5-10 years. We have everything machenical working correctly. It will drop off the pallet and move to pick up the new one Y-31.8897. This is when we get a (2028 x y not in position) alarm for pallet #2. I think there are data bits to tell it where the correct position is but not sure? The first pallet change is at home postions and it works.

[underthetire]

It may need to be at G30 (second home) to pick up the second one. Just a thought.

[angelw]

Originally Posted by Scottjit We have a V20 0m with a 2 pallet system. The machine works correctly but the pallet has not worked in 5-10 years. We have everything machenical working correctly. It will drop off the pallet and move to pick up the new one Y-31.8897. This is when we get a (2028 x y not in position) alarm for pallet #2. I think there are data bits to tell it where the correct position is but not sure? The first pallet change is at home postions and it works.

Its highly likely that a Custom Macro program is used to carry out the pallet change, and will be a protected program in the 9000 to 9999 program area.

1. Set bit #4 of parameter #0010 to 0 to enable viewing of these programs.
2. Set bit #5 of parameter #0011 to 1 so that the Macro program can be stepped through in single block.

With the above parameters set, program a pallet change that will result in the error situation, and single block through the Macro program to see what commands are used to position for the pallet change and go from there. Post back if the above is the case and you require further help.

There may be a proximity switch that confirms the "In Position" of the Y slide for the pallet change. You need to determine if there is such a switch anywhere in the area that can be made when the Y slide is in the position for the pallet change. If so, check that its working. If I'm correct about a Custom Macro program being used and that a proximity switch is being used for confirmation, you may see reference to Interface Signal variables, typically #1000 to #1015 and #1100 to #1115.

If the pallet change is not carried out with a Custom Macro program, its control will be via a Ladder Logic program. If this is the case, you should have a copy of that included in the manuals for the machine. You will have to find the area of the program that controls the pallet change in the Ladder and see that the logic is being satisfied.

My bet is that it will be a faulty prox, but time and further investigation will tell.

Regards,

Bill

[Scottjit]

Originally Posted by angelw Its highly likely that a Custom Macro program is used to carry out the pallet change, and will be a protected program in the 9000 to 9999 program area. 1. Set bit #4 of parameter #0010 to 0 to enable viewing of these programs. 2. Set bit #5 of parameter #0011 to 1 so that the Macro program can be stepped through in single block. With the above parameters set, program a pallet change that will result in the error situation, and single block through the Macro program to see what commands are used to position for the pallet change and go from there. Post back if the above is the case and you require further help. There may be a proximity switch that confirms the "In Position" of the Y slide for the pallet change. You need to determine if there is such a switch anywhere in the area that can be made when the Y slide is in the position for the pallet change. If so, check that its working. If I'm correct about a Custom Macro program being used and that a proximity switch is being used for confirmation, you may see reference to Interface Signal variables, typically #1000 to #1015 and #1100 to #1115. If the pallet change is not carried out with a Custom Macro program, its control will be via a Ladder Logic program. If this is the case, you should have a copy of that included in the manuals for the machine. You will have to find the area of the program that controls the pallet change in the Ladder and see that the logic is being satisfied. My bet is that it will be a faulty prox, but time and further investigation will tell. Regards, Bill

Thanks that is a lot of informations. There is not a program in the 9000, or 8000 could have been wiped out. There is not a switch on the machine that we can find. I do not have the electrical prints for the pallet change but do have the Ladder hardcopy from when they modified it for the pallet changer.I have tracked it back and do not see a X address for a switch. It looks like it is looking for a D599 or a g201. Not sure on the ladder at this point. Could I e-mail it to you to take a look? I have it in a PDF but too large to post. We know there is not a switch for the #1 station and it works well.
Thanks for the help,
Scott

[Scottjit]

This is a link to the ladder. We are trying to get the Y82.0=pallet load(m61) to highlight.

http://dl.dropbox.com/u/10562286/DOC110105.pdf

[angelw]

Originally Posted by Scottjit There is not a program in the 9000, or 8000 could have been wiped out. I do not have the electrical prints for the pallet change but do have the Ladder hardcopy from when they modified it for the pallet changer.Scott

Scott,

If the first pallet is being changed successfully and an attempt is being made for the second, it wont be a case of a Macro program being wiped out if one doesn't exist. If this were the case a No Program Found alarm would be generated.

You make reference to Ladder being modified for the pallet changer. Is the pallet changer not original equipment with this machine?

Is the Y slide physically going to, or close to the correct position to pallet change for the second pallet?

I'll PM you my email address.

Regards,

Bill

[Scottjit]

Originally Posted by angelw Scott, If the first pallet is being changed successfully and an attempt is being made for the second, it wont be a case of a Macro program being wiped out if one doesn't exist. If this were the case a No Program Found alarm would be generated. You make reference to Ladder being modified for the pallet changer. Is the pallet changer not original equipment with this machine? Is the Y slide physically going to, or close to the correct position to pallet change for the second pallet? I'll PM you my email address. Regards, Bill

No macro we made up a program to do all the moves that are needed IE the m-codes for a pallet change. We found a list of the m-codes and the positions of Pallet #1 X-0 Y-0 and Pallet #2 X-0 Y--31.8897. so this is where our program takes it. The alarm is 2028 X Y not in position. Does the same is we hand wheel it there.