OPTI-UPS DS-D33, User Manual

Page: 7 / 83

1-3
Back-up Mode:
Since the battery is connected directly to the DC bus, when the AC failure, the
battery change immediately from receiver to donor, supply 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 abnormal conditions, such as over temperature, short circuit,
abnormal output voltage or overloaded for a period exceed the inverter’s limit, the
inverter will automatically shutdown, 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.