Delta DPH-300K, User Manual

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3 - 3
3 Operation Modes
3.1.2 Battery Mode_ Single Input_ Single Unit
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 Breaker (Q4). During the conversion process, output voltage
remains the same. Please see
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for the Battery mode diagram. 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 LOAD
Q1
Q2
Q4
Q3
Batteries
Rectifier Inverter
Static Switch
Q5
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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
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. 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 screen.
MAIN LOAD
Q1
Q2
Q4
Q3
Batteries
Rectifier Inverter
Static Switch
Q5
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