Määritelmä
A UPS keeps devices such as servers, switches, recorders and PLCs running from a battery when the mains fails or the voltage fluctuates. Its purpose is not to run for days but to bridge short outages and, in a long one, give systems time to shut down cleanly. Sizing uses the load (watts) and the required time (minutes); with a network card the UPS shuts the server down automatically before the battery runs out. Batteries are replaced every three to five years; an unmaintained UPS is the first thing to fail during an outage. It is considered mandatory for server rooms, camera recording points and automation panels.
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In server and camera installations we size the UPS with the load, configure automatic shutdown and put the battery replacement date in the maintenance calendar.