User Guide

3
INTRODUCTION AND SYSTEM DESCRIPTION
Congratulations on your choice of the Liebert 3U POD
™
. The Liebert 3U POD provides main-
tenance bypass capability as well as power output distribution. The Liebert 3U POD can be
used on UPSs in the rack mount or tower configuration.
The Liebert 3U POD provides an isolated path of power for your UPS system for preventive
maintenance or service.
System Description
The 3U POD has two modes of operation: UPS (UPS available) and UTILITY (maintenance
bypass).
•In UPS mode, the power is routed through the UPS system delivering conditioned power
to the load, as shown in Figure 1.
Figure 1 UPS mode of operation
•In UTILITY mode, the power is routed around (bypassing) the UPS system (see
Figure 2). Utility power is supplied directly to the load through the 3U POD.
Figure 2 UTILITY/maintenance bypass mode
• The UPS may be turned off and removed without affecting the load. See Figure 3.
Figure 3 3U POD connections
!
CAUTION
Battery back-up and conditioned power are NOT available
during the UTILITY mode of operation.
Utility
POD
UPS
Connected
loads
Utility
Connected
loads
POD
UPS
UPS INPUT
Connect to load socket on
rear of UPS. Cable supplied.
Rotary switch
and power
indicator lamps.
UTILITY INPUT
Connect to utility wall socket. Use
original UPS utility input cord.
Connect UPS
input cord here.
Cable supplied.
Connect loads. Connect loads.