The user guide for batteries is very informative. This is very important, if you get the error battery low or the battery gone, never turn off the CNC machine. If you close it, the next time you open it, a lot of errors will occur because the machine will not be able to find its home position.
Fanuc BAT alarm (Battery low). Fanuc Battery Alarm (SRAM / CMOS / APC). The Fanuc BAT alarm can present on CNC control system relating to the preserving the CNC system or the APC batteries (absolute pulse code). BAT flashing appears when voltage is low! As per the OEM’s instructions the battery should be replaced annually to avoid problems.
The CNC has a battery to memorize data of part programs, offset data, system parameters and so on. When the battery was reaching the low level, the CNC would display on the screen before losing the important data in the memory. please replace the battery as Subsec. 2.6.1 within a week.
The Fanuc BAT alarm can present on CNC control system relating to the preserving the CNC system or the APC batteries (absolute pulse code). BAT flashing appears when voltage is low! As per the OEM’s instructions the battery should be replaced annually to avoid problems. Definitely should be replaced ASAP if the BAT warning appears.
Turn on machine (CNC) power. Replace the battery under the emergency stop state for safety, to escape the machine from moving during the replacement work. If the battery is replaced while the power is off, the memorized absolute position data will be lost, thus necessitating a reference position return operation.
Never replace the battery with other than the specified type (A02B–0177–K106). Turn off the power to the machine before replacing the battery. Complete the replacement work within 30 minutes. The contents of CNC memory may be lost if the power is turned off, and the battery is removed for 10 minutes or more.