Machine: Leblonde Makino/4 axis horizontal mill/ Fanuc controlled with Proffessional 3 software.
Has anyone ever had a problem with a servo motor moving by itself without any command. The 4th axis (table motor) is moving itself and then faulting out. It's been giving drive fault error 416. I dont remember the description of that alarm but I think it said something not being detectable. Sounds kind of like an encodor problem or a wrong drive parameter perhaps. But when it does this, the encoder must be working because I can see the positioning data changing. Crazy isn't it. The motor is brand new. the old one was faulting on 414(excess error). There are definately no buttons stuck or anything that would tell it to move. It even moves when it's not in any of the manual traversing modes (ie jog,rapid, or handle) It will simply move if the servos are on. But it always alarms out after a second or two with the 416 fault. I play with it a while and finally it will reference out and then it will run. I have had the speed of the motor slowed down to 1000. Any help on this subject will be greatly appreciated.