OnLine Power Power Wave 4 - Manual (Page 14)

6005-145 Rev. A 1-3
Back-up Mode:
Since the batteries are connected directly to the DC bus, when the AC fails, the
batteries change immediately from receiver to donor, supplying energy to the
inverter instead of receiving energy from the rectifier. The output AC is not
interrupted. Therefore, the load connected to the output is protected.
Reserve Mode:
When the inverter is in an abnormal condition, such as over temperature, short
circuit, abnormal output voltage or overloaded for a period exceeding the
inverter’s limit, the inverter will automatically shut down in order to protect
itself from damage. If the utility power is normal, the static switch shall
transfer the load to the reserve source without interruption of AC output.