Eaton 93PM-L 20–200kW (208V) UPS Installation and Operation Manual 164000724—Rev 01
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support the connected loads. When this event occurs, the UPS issues another set of audible and visual alarms
indicating SHUTDOWN IMMINENT. Unless the rectifier has a valid AC input soon, the output can be supported
for only two minutes before the output of the system shuts down. If the bypass source is available, the UPS
transfers to bypass instead of shutting down.
If at any time during the battery discharge the input power becomes available again, the rectifier switchgear
closes and the rectifier begins to supply DC current to the converter and inverter. At this point, the unit returns
to Normal mode. Depending on the total load and the duration of the battery discharge, battery current limit
alarms may be seen for a short time due to the current required to recharge the battery.
Figure 39. Path of Current Through the UPS in Battery 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..33
S
Siinnggllee U
UP
PS
S U
Unniitt S
Syysstteem
m O
Onneelliinnee C
Coonnffiigguurraattiioonnss
The system oneline drawings in this section show the simplified internal structure of the UPS, battery supply,
and basic maintenance bypass.
Oneline
Drawing
UPS Model
Voltage
System Type
Input
Output
See
93PM-L 200
208 or 220
208 or 220
Single ten UPM reverse transfer UPS with
external battery
Summary of Contents for 93PM-L IAC-B
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