Was going to put a call in to Fanuc Monday but would really like to keep moving on this. Machine is a horizontal machining center and has been powered down for a while. It was most certainly just fine last time it was run. I was going to stretch it's legs and swap some batteries.
Anywho, it fired up just fine and even warmed the spindle. However, as soon as I attempted to Jog the Y, it threw the alarm and shut down power to the servos. There are no amplifier alarms and nothing blown. All appears well.
Because this machine has scales and I can be very certain they are active, I am not quite sure how to troubleshoot the alarm, which is (Y axis encoder fault). I guess I am not sure if that is a scale fault or what but I can verify once power iss removed from servos, I can slightly move the Y and I have a reaction on the position screen so I doubt it is scale related.
When I first experienced the issue, it would not fault until I tried to move, so I moved carefully and it would take about two .001" steps before it faulted. I decided to reseat the connector to the Y servo encoder and now have an alarm as soon as I power up. I am pretty certain the Y has a brake in it because there is otherwise no ballast and I am a little surprised with that.
After pulling that encoder plug, I started to wonder if the control was also using the absolute encoders and I just made it lose it's mind by pulling the cable?
I will have to check schematics but these are Alpha drives and I need to know if servo encoder cables just go to control or hit the servo first?
I am just trying to come up with some cross checks to narrow down where the issue is. I know people will say "check your cable" but that is pretty easy to say from the couch. I honestly don't think a wire broke itself while sitting, but I do suspect some terminations. However, I just don't want to lose my home position and have to deal with that. This machine can be a nightmare to tune. It took me weeks to figure out how to set home position on the tool changer and its NOT fun.
Anywho, it fired up just fine and even warmed the spindle. However, as soon as I attempted to Jog the Y, it threw the alarm and shut down power to the servos. There are no amplifier alarms and nothing blown. All appears well.
Because this machine has scales and I can be very certain they are active, I am not quite sure how to troubleshoot the alarm, which is (Y axis encoder fault). I guess I am not sure if that is a scale fault or what but I can verify once power iss removed from servos, I can slightly move the Y and I have a reaction on the position screen so I doubt it is scale related.
When I first experienced the issue, it would not fault until I tried to move, so I moved carefully and it would take about two .001" steps before it faulted. I decided to reseat the connector to the Y servo encoder and now have an alarm as soon as I power up. I am pretty certain the Y has a brake in it because there is otherwise no ballast and I am a little surprised with that.
After pulling that encoder plug, I started to wonder if the control was also using the absolute encoders and I just made it lose it's mind by pulling the cable?
I will have to check schematics but these are Alpha drives and I need to know if servo encoder cables just go to control or hit the servo first?
I am just trying to come up with some cross checks to narrow down where the issue is. I know people will say "check your cable" but that is pretty easy to say from the couch. I honestly don't think a wire broke itself while sitting, but I do suspect some terminations. However, I just don't want to lose my home position and have to deal with that. This machine can be a nightmare to tune. It took me weeks to figure out how to set home position on the tool changer and its NOT fun.