OPTI-UPS DS3000D(L) - Manual (Page 10)

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7. OPERATION MODES OF THE UPS
7.1 UPS System Block Diagram
7.2 Normal Operation
There are two main loops when AC utility is normal: the AC loop and the
battery charging loop. The AC output power comes from AC utility input and
passes through AC/DC rectifier, DC/AC inverter and static switch to support
power to load. The battery charging voltage comes from AC utility input and
converted by AC/DC charger to support battery-charging power.
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7.3 AC Utility Failure
The AC output comes from battery, passing through DC/AC inverter and
static switch within the battery backup time.
7.4 Bypass Enable
Under the following conditions, the bypass will be enabled:
1.Overload.
2.Inverter failure.
3.Over-temperature