In ESS mode, the UPS’s detection and control algorithms continuously monitor the incoming power quality
to enable quick mode switching. The UPS can transfer to Online mode in less than 2 ms.
When the input power supply is within acceptable limits, the UPS operates in a high-efficiency energy
saving mode, protecting the equipment and supplying pure power to the equipment. The Energy Saver
System increases system efficiency up to 99 % when supplying 20–100 % of the rated load.
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In Online mode and ESS mode, the UPS supplies power to the load through batteries or other stored
energy sources if AC power is interrupted or if it is not in compliance with the specified parameters. The
front panel shows the UPS status Battery Mode, and the UPS is in In Service state. In Battery mode
the battery provides emergency DC power, which is converted to regulated output power by the inverter.
Figure
9: Path of current through the UPS in Battery mode shows the path of electrical power through the
UPS system when the UPS is operating in Battery mode.
Figure 9. Path of current through the UPS in Battery mode
1. Bypass input A Internal relay contact closed
2. Static switch B Internal relay contact open
3. Output C Main power flow
4. Inverter D Energized
5. Rectifier E De-energized
6. Rectifier input K1 Input relay
7. Battery converter K3 Output relay
8. Battery breaker
(closed)
K5 Backfeed relay
9. Battery
When AC power is interrupted, the rectifier cannot convert AC power into DC output to supply the inverter.
The input relay K1 is switched off, and the battery supplies UPS output through the inverter. The inverter
EATON 93T USER’S AND INSTALLATION GUIDE 614-40270
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December 2023 www.eaton.eu 2244
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