Battery Mode; Bypass Mode - Delta Modulon DPH Series User Manual

3.2

Battery Mode

The UPS transfers to Battery mode automatically if the main AC source is abnormal,
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 Switch (Q4). During the conversion
process, output voltage remains the same. During Battery mode, the UPS's tri-color
LED illuminates yellow and the text 'Battery' appears in the upper right corner of the
LCD screen.
Bypass
MAIN
Batteries
3.3

Bypass Mode

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 input is normal, it will automatically switch to
Bypass mode to protect the connected critical loads from power interruption. After the
above-mentioned abnormalities are eliminated, the UPS will switch back to On-Line
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 LCD screen.
Bypass
MAIN
Batteries
Delta UPS DPH 50-200kVA
Static Switch
Rectifier
Inverter
Figure 3-2: Battery Mode Diagram
Static Switch
Rectifier Inverter
Figure 3-3: Bypass Mode Diagram
LOAD
LOAD
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