Case Study: Eaton UPS Power-Cycling Every 7 Days
2020 — We have discovered three Eaton 5S Uninterruptible Power Supplies which seem to power-cycle (almost exactly) every 7 days:
|Eaton 5S 1200VA||August 2013||July 2020|
|Eaton 5S 1600VA||January 2014||August 2019|
|Eaton 5S 1200VA||July 2016||January 2020|
The following is a summary of the unexpected power loss on an affected server:
At one site, we conducted an experiment by shutting the server down during the period of the outage. However, when the server was restarted, the UPS tripped shortly after. This suggests that the timing is to do with the amount of time it is handling a load, and not a specific period according to the clock.