There is titled “APC UPS Power System Error 02000 Link” from Schneider Electric. Error 02000 generally means “No Battery Connected” or “Battery Disconnected” in APC UPS firmware logs. The word “link” likely refers to a communication link issue (USB/Serial) or a battery link failure .
If the UPS is a larger, multi-frame system, check the communication cables (often gray RJ-45 style cables) connecting the frames. Ensure cables are not pinched or frayed. apc ups power system error 02000 link