fanuc c1500a power problems 1

[rich0318]

Hello and its nice to join all of you. My company has a Fanuc c-1500A on a 1993 Mazak Super Turbo X510-3D, and we had a third party come in and replace all the optics. We've done a flush using Citronox, and he has tuned the power supplies etc. But I am still having two issues that I am not sure if anyone else has seen.

One issue is the laser goes into Continuous Wave at 67% Duty and higher. The other issue is even though it does calibrate without alarm, the power coming from the laser is way higher than commanded. For instance, with power at 1,500 and duty at 50%, actual power is around 1,000 watts.

Has anyone else ran into this problem? If not are there any suggestions about what may be causing it?

Thank You

 

[RPosty]

I don't have your system, but my quick guess is you are running without power feedback. fanuc parameter 15208 for my machine

"I am stuck on Band-Aid brand, 'cause they are stuck on me"

 

[rich0318]

Thank you. Power feedback is on along with power calibration.. Thank you again for the suggestion.

 

[RPosty]

that is strange, is this happening all the time regardless of material? does it creep up or does it go right to 1000 watts. on our Amada, sometimes when operators cutting aluminum and do not have proper focus, nozzle height, assist gas etc, power indication will creep up because of reflections from the material getting back to the resonator. However it isn't really added power, for our laser the feedback causes the laser to think it is putting out too much power, then demands less causing the laser to skip across the material.

"I am stuck on Band-Aid brand, 'cause they are stuck on me"

 

[rich0318]

It happens all the time regardless of material. Looking at the screen when the beam turns on, it just makes its way up to the incorrect wattage in the power actual display. It does not creep up just goes there like all is normal. I am still puzzled about the laser going from pulse to continuous wave at 67% duty and above. Is there a board that monitors power output and is supposed to fix power output if too high or low? I am not quite sure otherwise why the laser would put out over excessive power. I mentioned to Fanuc about the duty problem, but no help, just a chewing out about why not to use third party people... This is the 0L controller I forgot to mention. I much prefer the 16L.

 

[RPosty]

wish I knew your system, if it was one of mine i would know where to start, so I can only give advice like it was one of mine. Oh, you have an O-L, we do have an OL controller on a PRC 2200, if it was that machine, I may look at the fiber optic cables which send the signals to the modulator tank. we have had them cause problems like that. has any maintenance been done prior to this issue? we had a "new guy" put the fiber optic cables in wrong order and that is exactly what caused it. You can check the fanuc outputs on the diag page to see what bits are being sent to the laser, that will require some reading and aspirin on your part, with an oscope, you can check the bits the lasers brain is sending to the modulator (if like the PRC) I do have a C2000 with fanuc laser, i will look to see how that works monday, this is interesting problem.

"I am stuck on Band-Aid brand, 'cause they are stuck on me"

 

[Foostrap]

On older Fanuc resonators, the power feedback is only active at full DC (100% duty). For other values, it is using "power tables" to calculate how much power it should generate.
If you run it at 100% DC with 1500W, do you get 1500W? If you run it at 100% with 1000W, do you get 1000W? If so, then your power and power feedback is working fine.

When you command 80% DC for example, can you see on the Fanuc laser status screen that you do indeed have 80% DC? If that is good as well, then most likely power tables. You should then have somebody come in to calibrate the power tables.

 

[rich0318]

Thank you for the response. Yes, if I command 1,000 watts CW then I get about 1,020 watts, and I also get full power at 1,500 watts.

I am thinking based off of what your telling me it is the power tables. I however have no idea where they lie in the machine. I'll have to get Fanuc out here to see what the deal is. Again, I appreciate all the work you have put into finding out what this problem may be.