Operation manual
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10
3.1.3
Bypass mode
If the inverter is out of order, or if overload occurs, the static transfer switch will be activated to transfer the load
from the inverter supply to bypass supply without interruption to the critical load (Fig. 3-3).
In the event that the inverter output is not synchronized with the bypass AC source, the static switch will perform
a transfer of the load from the inverter to the bypass with power interruption to the critical AC load. This is to avoid
paralleling of unsynchronized AC sources. This interruption is programmable but typically set to be less than an
electrical cycle e.g. less than 15 ms (50 Hz) or less than 13,33 ms (60 Hz).
Fig. 3-3 Bypass mode
3.1.4
ECO Mode
When the UPS is at AC Mode and the requirement to the load is not critical, the UPS can be set at ECO mode in
order to increase the efficiency of the power supplied (Fig. 3-4). At ECO mode, the UPS works at Line-interactive
mode, so the UPS will transfer to bypass supply. When the AC is out of set window, the UPS will transfer from
bypass to Inverter and supplies power from the battery, and then the LCD shows all related information on the
screen.
Fig. 3-4 ECO mode
3.1.5
Maintenance mode (Manual Bypass)
A manual bypass switch is available to ensure continuity of supply to the critical load when the UPS is out of order
or in repair and this manual bypass switch bears for equivalent rated load (Fig. 3-5).
