OnLine Power Power Wave 4 - Manual (Page 13)

6005-145 Rev. A 1-2
Another important issue is reliability. The prime aim of a ELI is to protect your
load. Therefore, the ELI should be much more reliable than the AC source. An
unreliable ELI may suffer the problem of frequent break down, even more
frequent than AC failure, and the cost of repair may become more than the cost
of the unit itself.
Generally, there are four different modes of operation, the NORMAL
OPERATION MODE, the BACK-UP (BATTERY) MODE, the RESERVE
MODE and the MAINTENANCE BYPASS MODE. These are explained
below.
Normal Operation Mode:
The rectifier converts the AC input to DC power to supply the inverter and
charge the batteries simultaneously. All the fluctuations, surges and spikes of
the AC input are removed during AC to DC conversion. Therefore, the AC
supplied by the inverter is clean and stable.