Installation
11
3.8
EPO Switch
The Liebert PSI XR is equipped with an Emergency Power Off (EPO) switch. The user must supply a
means of interfacing with the EPO circuit to allow disconnecting the UPS input feeder breaker to
interrupt all sources of power to the UPS and connected equipment to comply with national and local
wiring codes and regulations.
Figure 12
EPO connection for normally open operation
3.9
External Battery Cabinet Installation
Optional Liebert external battery cabinets may be connected to the UPS to provide additional battery
run time. External battery cabinets are designed to be placed all on one side of the UPS or stacked
beneath the UPS. The batteries have a maximum run time of three hours at full load.
1.
Shut down any connected equipment and turn Off the UPS.
2.
Install the external battery cabinet in a tower configuration or in a rack (see
Figure 13
or
3.3 -
Rack-Mount UPS Conversion and Installation
).
3.
Connect the external battery cabinet cable to the rear of the external battery cabinet, then to the
rear of the UPS (see
Figure 14
.
Figure 13
Install the external battery cabinet in tower installation
NOTICE
External battery cabinet connectors are color-coded as noted in
Table 1
. Do not try to install
external battery cabinets with connectors that are a different color from the battery connector
on the UPS.
1
2
1 = EPO+
2 = Ground
Short Pin 1 and Pin 2 to enable the EPO function
Install tower stands and set
the UPS and battery cabinet
in them; check to ensure
stability
Connect the top of the UPS
to the top of the battery cabinet
with the Battery UPS Tab and
hardware
If two or more battery cabinets are
used in a tower setup, the tower stand
must be extended with the spacers
included with each battery cabinet.
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Liebert UPS user manual
