Delta Modulon DPH 200kVA, User Manual, Page: 59 / 232

3-33
3
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Operation Modes
3.3 Hot Standby Redundancy (Only For Dual Input & At Least
Two UPSs)
To provide customers more application choices, the UPS with a dual-input configuration can
have a hot standby redundancy function. If you use two UPSs and wish them to work in hot
standby redundancy mode, please connect the output of UPS1 to the bypass AC source of
UPS 2. Please see
Figure 3-23
. For more information about the hot standby redundancy
application, please contact service personnel.
In normal condition, it is the UPS 2 inverter that supplies power to the critical loads. Both UPS
1 & UPS 2 tri-color LEDs illuminate green.
When the UPS 2 inverter becomes abnormal, the UPS 2 will automatically transfer to bypass
mode and the UPS 1 inverter will supply power to the critical loads. Under such circumstances,
the UPS 1 tri-color LED illuminates green and the UPS 2 tri-color LED illuminates yellow.
MAIN
LOAD
BYPA.
MAIN
1
2
BYPA.
Q0 Q2
Q1 Q4
Q3
UPS
Q1 Q4
Q3
UPS
Q5
Q5
Q2 Q0
Delta or non-Delta External Maintenance Bypass Cabinet
Batteries
Rectifier Inverter
Static Switch
Delta or non-Delta External Maintenance Bypass Cabinet
Batteries
Rectifier Inverter
Static Switch
(Figure 3-32: Hot Standby Redundancy Diagram (only for Dual Input & at Least Two UPSs))