Chapter 4 : Operation Modes - Delta Ultron HPH Series User Manual

y
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
y
Standby Mode
When the input voltage and frequency of the utility AC power are within the normal range, the UPS
runs in standby mode and charges the batteries. The bypass and the inverter have no output.
BYPA.
MAIN
Ultron HPH Series UPS

Chapter 4 : Operation Modes

Rectifier
Batteries
(Figure 4-1: Path of Electrical Power through the UPS in Online Mode)
Rectifier
Batteries
(Figure 4-2: Path of Electrical Power through the UPS in Standby Mode)
) illuminates (green).
NORMAL
Inverter
Inverter
12
LOAD
LOAD