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ITGlossary · UPS technology
Auto Restart
A UPS feature that automatically restarts the system after utility power returns following a shutdown.
Technical level:Basic
When an outage lasts longer than the battery can hold, the UPS shuts down to protect the batteries from deep discharge. With auto restart, as soon as mains voltage returns, the UPS switches itself back on and powers the loads, without anyone having to press the button. On some models the restart happens only after the battery has charged to a minimum level.
This feature is essential at unattended sites, such as remote racks, cameras, routers and security systems, where a technician visit costs time.
A common mistake: the UPS starts, but the server stays off. Set the AC power recovery option in the server's BIOS so that it powers on as soon as it receives power.
Related terms
- Cold Start FunctionA feature that allows a UPS to be started directly from the battery without utility power.
- AutonomyThe time a battery-powered system (like a UPS) can continue operating critical loads after a power failure.
- Emergency Power Off (EPO)A safety feature that allows immediate shutdown of power to connected systems in an emergency.
- Zero Transfer TimeA feature of online UPS systems, where the inverter feeds the load continuously so a power cut causes no gap at all.
- ATS (Automatic Transfer Switch)A device that automatically moves the load from the grid to a generator during an outage and back again when grid power returns.
- Capacity SystemParallel UPS units that share the load with no spare unit (N configuration), so the failure of one unit overloads the rest.