Delta DPS-400K - Single Unit Operation Modes

3-2
Ultron DPS Series
The UPS system supplies power to the connected critical loads with four basic operation modes,
which are normal mode, battery mode, bypass mode and manual bypass mode. The unit
automatically switches between these modes as required to make sure that the critical loads are
protected from power interruption. Besides these four operation modes, the UPS is also designed
for common battery, and ECO mode functions. Please see the following sections for single unit and
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NOTE:
Q1, Q2, Q3 and Q4 Switches shown in the following diagrams represent Input Switch,
Bypass Switch, Manual Bypass Switch, and Output Switch respectively.
3.1 Normal Mode (Single)
LOAD
BYPA.
MAIN
Q3 Switch
Q2 Switch
Q1 Switch
Rectifier Inverter
Circuit
Breaker
Batteries
STS
Q4 Switch
(Figure 3-1: Path of Electrical Power through the UPS in Normal Mode)
In normal mode, the main AC source supplies AC power via the Input Switch (Q1) to the
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receiving the DC power, the inverter converts it into clean and stable AC power before the
static switch. After that, the inverter supplies the AC power via the static switch and the
Output Switch (Q4) to the connected critical loads. During normal mode, LEDs illuminate as
follows.
Fault