KFAS: Fanuc CNC Parts, Service, & Repair
Phone: (281) 769-2671F
About memory back up batteriesAll Fanuc CNCs (with the exception of Fanuc model 6 and 11 which utilizes Bubble Memory Units)
Fanuc 0, 10, 15 controls uses three 1.5V
D-Cell Alkaline batteries. These batteries are in an enclosure
(click here to view) usually mounted on the machine where it is easily accessible from outside without
having to open the electrical cabinet.
Fanuc 16, 18 (model A, B, C, i series)
controls normal use lithium battery which is connected to the control unit
(click here to view) and located inside the cabinet. However, some Fanuc 16/18 controls where
machine builder installed an external battery box (as described earlier for 0, 10, and 15 controls) and you can use
regular Alkaline batteries. Please refer to relevant machine builder's manual and/or Fanuc manual on
battery replacement procedures.
Under normal circumstances, control will
generate a battery low message or alarm if the battery need replacement.
However this message is nothing more than a small display on the bottom corner of the screen and says
something like "batt". It is easy to overlook. Most of the time customer will realize that battery has gone low or
sometimes actually went completely dead when machine is shut off for holidays or weekends. The common symptom
will be that you will get a variation of "RAM parity error" or "System alarm 9xx" depending on the control model.
Should this occur, the only way to recover
from this situation is to clear memory and reload all the data.
Be sure to refer to relevant Fanuc maintenance for alarm detail and procedures on how to clear and reload and
data and of course you still have to replace the batteries.
We RecommendIt is recommended that you keep a regular schedule and replace memory backup batteries at least once a year
Memory backup procedures for various Fanuc CNCs
CautionControl must be turned ON when memory battery backup batteries are replaced.
For Fanuc 0, 10, 15 controls where the battery compartment is easily
accessible from outside, battery replacement
is relatively easy since you do not need to open the control cabinet where high voltage present and risk of electric shock.
Just be sure to pay attention to the polarity of batteries when you are taking them out and putting the new ones in.
If you have Fanuc 16/18 (model A, B, C, i) and
15 (model B, i), then replacing batteries is trickier.
The location of the battery could be any where from behind the CRT/LCD display to inside the electrical cabinet.
Since you will have to replace the battery while the power is applied to the control, be sure to take all necessary
precautions and the person who is performing the task should be familiar with the danger involving working
around high voltage. Be sure to consult all relevant machine and control manuals.
Better yet, if you have several Fanuc controls, schedule a service call to perform data backup and battery replacement.