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10 G9000 Installation and Operation Manual
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.
C) Battery operation: Load Power supplied by UPS battery.
FIGURE 1.3 Single Line Diagram – Battery Operation
Bypass
Input
CB
User supplied
MCCB
Static Transfer
Switch
52S
AC
Input
CB1
CONVERTER
INVERTER
52C
Output
Power Flow
Not in Use
UPS Module
Battery
Cabinet
CB
User supplied
MCCB
CB2
External
Battery
CB3
CB
CHARGER
Figure 1.3 shows that in the event of AC input source failure or interruption, the UPS
Converter(s)* will de-energize and the UPS battery(s)* will immediately discharge and supply DC
power to the Inverter to maintain continuous AC power to the load. This operation will continue until:
a) The battery 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 critical load, and recharge the batteries.)
A fully charged battery will provide power for the specified time at the rated load, or longer, at a
reduced load.
* (s) : In the case of the Parallel Operation