This UPS is starting to age, but has been running successfully for several years. last week it self shutdown unexpectedly. Examining the DATA2 log showed that on the 22\3\2016 17:15:37 the UPS probably went into Bypass Mode. The Event log doesn't go back that far, so cant confirm this. The Data log updates every 10 minutes, so probably the input voltage went over Bypass Upper Voltage 253VA.If you look at the attached data2.txt you will see that the battery capacity percentage immediately started dropping over the next 6 days and sat on 0% for the next day. On 29/3/2016 the UPS EVENT2 log shows that the UPS Returned from bypass and turned off. Possibly this was triggered by the 14 day self test.
Any thoughts please - why did the battery start discharging. Why did the UPS not return from Bypass Mode automatically. What is Bypass Mode,...