Fanuc alarm: 316/326/336/346/356/366/376/386 - APC alarm: nth-axis battery voltage 0

1. First replace the batteries to see if problem goes away. 2. If they drain quickly you must determine which pulse coder or cable is shorted and drawing the battery down. (APC)=Absolute pulse coder. 3. If the alarm occurs immediately after power on when a cable or encoder was disconnected from the battery. Power down and up again to clear battery voltage 0 alarm.