Eaton 93E MK2 Operation Manual

Understanding UPS Operation
Eaton 93E UPS (300/400 kVA, 380/400/415V) Installation and Operation Manual 5-3
5.2.3 High-Efciency 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.
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.
Bypass Input
Rectifier
Input
Input Breaker
Breaker
Input
Contactor
Output
Contactor
Output
Contactor
Closed
Main Power Flow
Trickle Current
Energised
De-Energised
Open
Battery
Converter
Inverter
Battery
Contactor
Battery
Rectifier
Static
Switch
Bypass Contactor

Eaton 93E MK2 Specifications

General

Brand	Eaton
Model	93E MK2
Category	UPS
Language	English