Data center downtime can cost a lot of money. As we have shown in another article already, UPS related failure can be the most costly.
There are many strategies to prevent this, e.g. an effective preventive maintenance plan to ensure the ongoing integrity of your UPS. Part of every maintenance strategy are a number of functional tests and component checks. We collected all of them and highly recommend to conduct them regularly:
Transfer to bypass and return to UPS
This test checks the static switch and bypass breaker motor operator or contactor. The test interval should be at least annually.
Battery operation and return
This test is typically performed monthly and tests the UPS, generator and automatic transfer switch functions. Sometimes it is coupled with a transfer-to-generator support and return to normal.
Load balancing evaluation
This test checks for loads on any phase that may be approaching 100%. Loads may be redistributed to limit potential overloads.
Phase rotation/site wiring checks
This test inspects for out-of-limit bypass alarms. These problems can go undetected until a transfer to bypass is attempted.
Operator refresher training
Since most power interruptions are a result of human error, constant attention should be paid to ensuring and documenting that all personnel with access to the UPS have a solid understanding of the operation of the system.
For more information about best practices for a UPS preventive maintenance plan we recommend this article after the link.