Chapter 4 : Operation Modes - Delta HPH-60K User Manual

Chapter 4 : Operation Modes

Online Mode
The critical load is supplied by the inverter, which derives its power from the utility AC power, and
the UPS charges the batteries as needed and provides power protection to the equipment. During
on-line mode, the NORMAL LED indicator (
BYPA.
MAIN
(Figure 4-1: Path of Electrical Power through the UPS in Online Mode)
Standby Mode
When the utility AC power's input voltage and frequency are within the main input's normal range
but out of the bypass input's normal range, the UPS runs in standby mode and charges the
batteries. The bypass and the inverter have no output.
BYPA.
MAIN
(Figure 4-2: Path of Electrical Power through the UPS in Standby Mode)
Rectifier Inverter
Batteries
Rectifier Inverter
Batteries
17
Chapter 4
) illuminates (green).
Operation Modes
LOAD
LOAD