Delta Modulon DPH series - Single Input; Online Mode_ Single Input_ Single Unit

3-4
Modulon DPH Series
MAIN LOAD
BYPA.
Q0Q2
Q1 Q4
Q3
UPS
Q5
Batteries
Rectifier Inverter
Static Switch
Delta or non-Delta External Maintenance Bypass Cabinet
(Figure 3-2: Dual Input Application_ UPS and Delta or non-Delta
External Maintenance Bypass Cabinet Structure)
4. Up to eight UPS units can be paralleled for redundancy and capacity expansion. Only
UPSs with the same capacity, voltage and frequency can be paralleled. Please only use
the provided parallel cable to parallel the UPS units. Otherwise, parallel functions will fail.
3.1 Single Input
3.1.1 Online Mode_ Single 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) and the UPS’s Bypass Switch
(Q0) 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 refer to Figure 3-3. 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.