Originally Posted by
eriksalo
Hi;
I have a Fanuc Series 3 AC Servo Amp driving my spindle.
The Amp/Spindle works great but after prolonged (>20Minutes) of high speed operation, the spindle alarms and shuts off showing an error #2. For ~10 seconds prior to failure, the motor sounds different and it appears to hunt for speed. After the failure occurs, the spindle easily and freely rotates by hand.
"Speed is deviated from the command value due to overload and others."
The Amp is a model A06B-6044-H007 (Model 3) that drives a Fanuc AC Spindle Motor Model 3 (A06B-1003-B100, 5/7.5Hp). I have a 2 speed gearbox.
The systems works perfectly in normal / short operation. I make power with a rotary phase converter and can't run the motor to its max RPM. The max RPM is 6,000 in high gear but I only run at max 4,000 RPM due to (I think) current limitations. If I try and run fast, I get speed deviations and then the same error #2.
I'm assuming this is a heat related issue. Any advice on where to start looking?
Thanks; Erik