Serious problem in new Fanuc 0iMC.
Hello all,
I bought a new Doosan DNM400 last year. It has now run 340 hours. At 140 hours this thing happened: I was running from a PMCIA card, milling waterline, hence the z value is constant, at that time it was, say 35 (can't remember exact value). The feedrate was 250mm/min. Suddenly the z value started to fluctuate between 34.xxx and 36.xxx. The values on the screen was 35. The feeding started to slow down and speed up from 120-600. I can't say if the X & Y moved wrongly, or if it was only the Z axis.
In other words, the program on the screen didn't take palce in the machine.
The part was damaged. When shutting the machine down and restarting the same program all was fine, no problems
I contacted my sales rep and the contacted Fanuc. They said that running from a non Fanuc memorycard may cause this problem. I got a Fanuc card and have been using it since. Now at 340 hours the same problem occurs, and is remedied by shutting down and restarting.
Has anybody experienced similar problems and found a cure for it?
Thanks!
Re: Serious problem in new Fanuc 0iMC.
Quote:
Originally Posted by
motordude
Hello all,
the Fanudc guy came here in a few days ago. He couldn't find any errors, but there was a small proplem with one of my programs. I used G17 when it should have been G19. But the second time the problem occured, the G17/G19 scenario wasn't an issue, so it must have been something else. He tried to provoke the machine using G17/G19 commands wrongly, but nothing happened.
Anyway, to be on the safe side, he changed a servo driver card, hopefully that will cure the problem. We'll wait and see!
FYI, For those who view this post later, as I did, I also have a FANUC Oi-MC controller on a Robodrill Mate that has a similar problem. I have been using a 16G CF memory card (Sandisk Ultra) because I saw that it worked. However I knew the Oi-MC operators manual only "tested and certified" smaller and older Sandisk and Hitachi CF cards, with a maximum size of 512M.
My theory is that the CF card may be doing some FLASH memory housekeeping occasionally, to do "levelling" of the flash, and causing a momentary pause during streaming. I had some old Sandisk 256M and 512M CF cards and will test them. I really dont need 16G, but do need to get rid of the occasional pause in motion after the machine has run a long time (over 10 hours continuous, as I am mold making).