Eaton 93PM-L 20–200kW (208V) UPS Installation and Operation Manual 164000724—Rev 01
107
If the UPS suffers an internal failure and is configured for capacity, it switches automatically to Bypass mode
and remains in that mode until the failure is corrected and the UPS is back in service.
Figure 37. Path of Current Through the UPS in Normal Mode
Bypass Input
Rectifier Input
Rectifier
Switchgear
Main Power Flow
Trickle Current
Energized
De-Energized
Rectifier
Battery
Converter
Battery
Switchgear
Battery
Inverter
Inverter
Switchgear
Output
Static
Switch
Closed
Open
Switchgear
55..22..44
B
Byyppaassss M
Mooddee
CAUTION
The critical load is not protected from voltage or frequency fluctuations or power outages while the UPS is in
Bypass mode.
The UPS automatically switches to Bypass mode if it detects an overload, load fault, or internal failure (if
configured for capacity). If configured for redundancy (N+1) the UPS would remain on line in Normal mode if
one UPM failed. The UPS can also be transferred from Normal mode to Bypass mode manually. The bypass
source supplies the commercial AC power to the load directly.
shows the path of electrical power
through the UPS system when operating in Bypass mode.
In Bypass mode, the output of the system is provided with three-phase AC power directly from the system
input. While in this mode, the output of the system is not protected from voltage or frequency fluctuations or
power outages from the source. Some power line filtering and spike protection is provided to the load but no
active power conditioning or battery support is available to the output of the system in the Bypass mode of
operation.
Summary of Contents for 93PM-L IAC-B
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