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Understanding UPS Operation
Bypass Input
Rectifier Input
Rectifier
Switchgear
Figure 5-5. Path of Current Through the UPS in Battery Mode
5.3
Single UPS Unit System Oneline Configurations
The system oneline drawings in this section show the simplified internal structure of the UPS, battery supply,
and basic maintenance bypass.
Oneline Drawing
See Figure 5-6
See Figure 5-7
See Figure 5-8
See Figure 5-9
5-6
Eaton 93PM UPS (20–50 kW, 480V Four Wire – 50 kW Frame) Installation and Operation Manual P-164000540—Rev 4
Bypass Switchgear
Rectifier
Switchgear
Closed
Open
UPS Model
Input
93PM-50-1
480
93PM-50-1
480
93PM-50-1
480
93PM-50-2
480
Static
Switch
Battery Converter
Battery
Switchgear
Battery
Voltage
Output
480
Single one UPM reverse transfer UPS with internal battery
480
Single one UPM reverse transfer UPS with internal and
external batteries
480
Single one UPM reverse transfer UPS with external battery
480
Single two UPM reverse transfer UPS with external battery
Inverter
Inverter
Switchgear
Main Power Flow
Trickle Current
Energized
De-Energized
System Type
www.eaton.com/powerquality
Output
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