OnLine Power Battery Backup System - Manual (Page 7)

OLP
Three Phase UPS Systems
1. SYSTEM OVERVIEW
1-3
Back-up Mode:
Since the batteries are connected directly to the DC link, when the AC fails, the
batteries change immediately from receiver to becoming the source, supplying
energy to the inverter instead of receiving energy from the rectifier. The output AC
is not interrupted; protecting the load connected to the output.
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 will automatically transfer
the load to the reserve source without interruption of AC output.