Case Study: Eaton UPS Power-Cycling Every 7 Days2020 — We have discovered three Eaton 5S Uninterruptible Power Supplies which seem to power-cycle (almost exactly) every 7 days:
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. |
