Riello UPS Sentinel Dual (High Power) (3.3 - 10 kVA) - Manual (Page 54)

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ODES OF OPERATION
The mode that gives the load maximum protection is ON LINE mode (default), where the energy intended
for the load undergoes a double conversion and is reconstructed on the output in a perfectly sinusoidal way
with frequency and voltage fixed by the precision digital control provided by a microprocessor fully
independently of the input (V.F.I.). *
Besides the traditional ON LINE double conversion operating mode, it is also possible to set the following
modes:
 ECO (LINE INTERACTIVE)
 SMART ACTIVE (shown on the display as “SMART”)
 STAND-BY OFF (shown on the display as “STBYOFF”)
For optimized efficiency, in ECO mode, the load is powered normally from the bypass. If the mains exits
from its specified tolerances, the UPS switches to the normal ON LINE double conversion operating mode.
About five minutes after the mains has returned inside tolerance, the load is again switched to bypass.
Where a user is unable to decide between the most suitable operating mode (ON LINE or ECO), he can leave
the choice to SMART ACTIVE mode in which, in relation to statistics regarding the quality of the mains
power supply, the UPS autonomously decides which mode to configure itself in.
Finally in STAND-BY OFF mode, operation is as a back-up device:
with mains line present, the load is powered down, whereas when a black-out occurs the load is powered by
the inverter through the batteries.
*
The output voltage rms value is fixed by precision, microprocessor control independently of the input voltage,
whereas the output voltage frequency is synchronised (inside a tolerance that is user-settable) with that of the input to
allow use of the bypass. Outside this tolerance range, the UPS desynchronises, adopting the nominal frequency and the
bypass cannot be used any more (free running mode).