Figure 5-2. Path Of Current Through The Ups In Standard Normal Mode - Eaton 93E MK2 Installation And Operation Manual

If the utility AC power is interrupted or is out of specification, the UPS automatically switches to Battery
mode to support the critical load without interruption. When utility power returns, the UPS returns to
Normal mode.
Bypass Input
Rectifier
Input Switch
Input
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.
42 Eaton 93E MK2 UPS (10-40kVA, 380/400/415V) Installation and Operation
Bypass Switch (Optional Dual Input)
Rectifier
Input
Relay
Switch Relay
Closed
Open

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

Static
Switch
Inverter
Battery
Converter
Battery
Relay
Battery
Output
Output
Relay
Main Power Flow
Trickle Current
Energized
De-Energized