I have had an APC alarm that states I need to replace back up batteries for X Y Z C an B axis!!
I looked around in the back cabinet of the 2006 Doosan 2000SY an found the X an Z battery packs rite on the servo amps. they look to be a pack of 4 batteries with a little plug.
Looking on the other servo Amps I can not see any type of batteries on them, where could these C Y an B axis batteries be??
Also How many batteries are on this 2006 Doosan 2000sy with Fanuc 18-TB control??? I should just replace all of them at once!.
If you have a small battery pack with 4 cells, they are likely alkaline instead of lithium. FANUC changed over from the dual cell lithiums to the 4-cell alkalines a few years ago due to government regulations on air transport of lithium.
The FANUC PN of the 4-cell alkaline pack is A98L-0031-0025. Each cell looks like a shortened version of a AA battery. Parameter 1815 bit 5 (APC) determines if you have selected that a particular axis will use battery backup. If an axis has this bit set to 1, then you would have to see a battery pack or a cable that goes to an external battery pack connected to the front of the amplifier at the battery connection on the front of the amplifier (the marking varies). The external battery pack is usually a black plastic square box with 4 D-cells. One external battery pack can support multiple amplifiers.
With your situation, I'm guessing that you have a battery pack connected to an alpha i amplifier and then the CXA2A/CXA2B cable routes the battery signal to the other drive (along with other signals). So the dedicated battery connector of some of the amps have nothing on it.
So, I'd replace the cells you can find and re-establish the zeros.