DKC SMALLT1, Руководство пользователя

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4.4.3 Batteries and Battery Charger
The battery is installed inside the UPS. Depending on the required
autonomy, the battery can be installed inside the UPS and in an external
battery pack.
The battery is charged every time it has been partially or completely
discharged. When its full capacity is restored, it is disconnected from the DC
line. It is however periodically charged but the prevailing state is of complete
rest.
4.4.4 Bypass
Bypass allows you to switch the load power between the AVR and the
mains, and vice versa. Also, the user can independently transfer the UPS to
bypass mode by selecting the appropriate mode on the UPS display.
4.5 Operating status
The UPS has five different operating modes, as described below:

Normal operation

Bypass operation
 Battery operation
4.5.1 Normal operation
During normal operation, the rectifier is supplied by the AC single-phase
input voltage which, on its turn, feeds the inverter and compensates mains
voltage as well as load variations, keeping the DC voltage constant. At the
same time, it keeps the battery charged (floating or boost charge depending on
the battery type). The inverter converts the DC voltage into an AC sine-wave
with stabilized voltage and frequency, and also supplies the load.