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In the event of a load overcurrent, the UPS transfers to bypass without interruption to the critical load. In the case
of the Parallel Operation, all UPS will transfer to bypass without interruption to the critical load.
The internal control system determines the operation of the two paths, with the load powered from the inverter
being the normal operation.
3.2.3
Backup Operation: Load Power Supplied by UPS battery.
CB
Bypass
Input
supplied
MCCB
CB
AC
input
User
supplied
MCCB
CB
Energy
Storage
System
Power Flow
Not in Use
Figure 3-3 Single Line Diagram - Backup Operation: Load Fed by Energy Storage
Figure 3-3 shows that in the event of AC input source failure or interruption, the UPS Converter(s)* will
de-energize and the UPS energy storage devices will immediately supply DC power to the Inverter to maintain
continuous AC power to the load. This operation will continue until:
a)
The energy storage capacity expires and the inverter turns off, or
b)
Input power is restored. When input power is restored the converter will simultaneously power the inverter
and recharge the energy storage system.
12
Bypass Module
52 S
CB 3
Static Transfer
Switch
CONVERTER / INVERTER
CB 1
CHARGER
CB2
CONVERTER / INVERTER
CB 1
CHARGER
CB2
CONVERTER / INVERTER
CB 1
CHARGER
CB2
G9400 480V 1200-2000kVA Installation and Operation Manual 203078-001
UPS
CABINET
52 C
Power module
52 C
3 ~ 5 UPS
modules
Power module
52 C
Power module
Output
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