Uninterruptible Power Supplies

This page is intended to cover the basics involved with maintenance and repair of the general category of Uninterruptible Power Supplies

Definition
An Uninterruptible Power Supply, also called a UPS, is a device that supplies power to a connected load when the main power source is removed, usually through application of a battery that is otherwise charged from the main power source. This can be used to ensure enough time for a power down sequence, a bit of extra work time, or even an interim supply of power while switching from one power source to another. Typically, the device uses a sealed lead acid battery, but other technologies are available, such as lithium ion, and supercapacitor.

For individual UPS models or model series, please check for their own pages in the wiki. Many diagnostic procedures will remain the same across a number of models from a specific brand.