Hi all...

this morning my 5-axis machine didn't want to reference--- it gives me the alarm 411 servo alarm: B axis excess err... after I reset it, I can move the B axis to the opposite direction and if it goes too far I get the alarm 1002 overtravel hardware or AP69.
it seems the the B axis just lost where it is and the travel range is much small now... Can't figure out what it is...

anyone can help me out? do i have to replace a battery on this servo thing? where is the battery?

machine specs --- vertical 5-axis with fanuc series 16i-MB
LEHMANN EA-407 table with single spindel
servo type A860-2005-T301

thanks all!