Delta Modulon DPH 200kVA, User Manual, Page: 45 / 232

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Operation Modes
3.2 Dual Input
3.2.1 Online Mode_ Dual Input_ Single Unit
In online mode, the main AC source supplies AC power via the Delta or non-Delta external
maintenance bypass cabinet’s Input Breaker or Switch (Q1) to the rectifier and the rectifier
converts the AC power to DC power and supplies the DC power to the inverter. In the
meantime, the rectifier provides charging power to the batteries. After receiving the DC power,
the inverter converts it into clean and stable AC power to the connected critical loads via the
Delta or non-Delta external maintenance bypass cabinet’s Output Breaker or Switch (Q4).
Please see
Figure 3-18
for online mode diagram. During online mode, the UPS’s tri-color
LED illuminates green and the text ‘On-Line’ appears in the upper right corner of the screen.
MAIN LOAD
BYPA.
Q0 Q2
Q1 Q4
Q3
UPS
Q5
Rectifier Inverter
Static Switch
Delta or non-Delta External Maintenance Bypass Cabinet
Batteries
(Figure 3-18: Online Mode Diagram_ Dual Input Single Unit)
3.2.2 Battery Mode_ Dual 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 Delta or non-Delta external maintenance bypass cabinet’s Output
Breaker or Switch (Q4). During the conversion process, output voltage remains the same.
Please see
Figure 3-19
for 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.