41 Eaton® 9390 (100–160 kVA) UPS Installation and Operation Manual 164201604—Rev F
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K5
retrevnIreifitceR
K1 K3
Battery
Converter
Battery
Battery
Breaker
Main Power Flow
Trickle Current
Energized
De-Energized
Closed
Open
Breakers Contactors
K5
retrevnIreifitceR
K1 K3
Battery
Converter
Battery
Battery
Breaker
Main Power Flow
Trickle Current
Energized
De-Energized
Closed
Open
Breakers Contactors
Static
Switch
If the bypass source falls outside of a predetermined voltage or frequency window, the system forward
transfers to Battery mode and then to Normal mode with the inverter assuming the load. The transfer takes
place with a 2 ms typical transfer time, to ensure loads being fed by the system output are not interrupted. All
forward transfers transfer to Battery mode before returning to Normal mode. Energy Saver mode is a normal
operating mode, and not an alarm condition. While the UPS is in this mode, the NNOORRMMAALL light on the front
display will illuminate.
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The UPS automatically transfers to Battery mode if a utility power outage occurs, or if the utility power does not
conform to specified parameters. In Battery mode, the battery provides emergency DC power that the inverter
converts to AC power.
Figure 13 shows the path of electrical power through the UPS system when operating in Battery mode.
Understanding UPS Operation
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