High-Efficiency Mode; Figure 5-2. Path Of Current Through The Ups In Standard Normal Mode - Eaton 93E Operation Manual

Bypass Contactor
Bypass Input
Rectifier
Input Breaker
Input
Input
Contactor
Breaker Contactor

Figure 5-2. Path of Current Through the UPS in standard Normal Mode

If the UPS becomes overloaded or unavailable, the UPS switches to Bypass mode. The UPS automatically
returns to Normal mode when the overload condition is cleared and system operation is restored within
specified limits.
If the UPS suffers an internal failure, it switches automatically to Bypass mode and remains in that mode until
the failure is corrected and the UPS is back in service.
5.2.3

High-Efficiency Mode

When the UPS is operating in HE mode, commercial AC power is supplied directly to the critical load through the
internal bypass with the power module in a standby state. If a commercial power brownout, blackout, overvoltage,
undervoltage, or out-of-tolerance frequency condition occurs the system forward transfers to normal mode
(double-conversion on demand) or battery mode. If utility condition is OK on online mode, UPS will transfer to
ESS mode when battery charge current become less than 8A. UPS can charge battery with less than 8A charge
current on ESS mode.Battery will transfer to Rest state after battery has been fully charged, and stay at Rest
state for 28 days before turn on charge again. If charge current is higher than 8A, UPS will transfer to online mode
from ESS mode.
HE mode , if selected, is a normal operating mode, and not an alarm condition. While the UPS is in this mode,
the NORMAL light on the front display will illuminate.
Static
Switch
Rectifier
Battery
Converter
Closed
Open
Battery
Eaton 93E UPS (300/400 kVA, 380/400/415V) Installation and Operation Manual
Understanding UPS Operation
Inverter
Battery
Contactor
Output
Output
Contactor
Main Power Flow
Trickle Current
Energised
De-Energised
5-3