Battery Mode_ Single Input_ Single Unit; Bypass Mode_ Single Input_ Single Unit - Delta Modulon DPH Series User Manual

3.1.2 Battery Mode_ Single Input_ Single Unit

The UPS transfers to battery mode automatically if the main AC source cannot supply
power, for example, when unstable voltage or a power outage occurs. In battery mode, the
batteries provide DC power and the UPS converts it into AC power and supplies it to the
connected critical loads via the Output Breaker (Q3). During the conversion process, output
voltage remains the same. Please see Figure 3-2. During battery mode, the UPS's tri-
color LED illuminates yellow and the text 'Battery' appears in the upper right corner of the
screen.
MAIN
Batteries

3.1.3 Bypass Mode_ Single Input_ Single Unit

When the inverter encounters abnormal situations such as over temperature, overload,
short circuit, abnormal output voltage or low battery, it will automatically shut itself down.
If the UPS detects the bypass AC source is normal, it will automatically switch to bypass
mode to protect the connected critical loads from power interruption. Please refer to Figure
3-3. After the above-mentioned abnormalities are eliminated, the UPS will switch back to
online mode from bypass mode. During bypass mode, the UPS's tri-color LED illuminates
yellow and the text 'Bypass' appears in the upper right corner of the screen.
MAIN
Batteries
Q2
Rectifier
Q1
(Figure 3-2: Battery Mode Diagram_ Single Input Single Unit)
Q2
Rectifier
Q1
(Figure 3-3: Bypass Mode Diagram_ Single Input Single Unit)
Static Switch
Inverter
Static Switch
Inverter
3-3
3 Operation Modes
LOAD
Q3
LOAD
Q3