14 2 Installation
Vertiv™ | Liebert® PSI5 120V Input / 120V Output & 208V lnput / 208V Output Installer/User Guide
2.5 Connecting Loads
The UPS has non-programmable and programmable outlets. Plug your critical equipment (such as
computer, monitors, etc.) into the non-programmable outlets and your less-critical equipment (such as
printers and other less-often used peripherals) into the programmable outlets. Refer to setting numbers 2
and 3 in Table 3-6 for programming instructions.
2.6 Connecting for Network Protection (Optional)
Protection from electrical surges to your computer network or telephone is provided on 2U and MT
models. Use the network/fax/modem surge-protection ports on the rear panel. Connect the “IN” port to the
line from the wall jack and the “OUT” port to your device port. Use of this feature is not required for proper
operation of the UPS.
2.7 USB Connection
Basic monitoring of the PSI5™ and unattended controlled shutdown of your computer in case of a power
failure can be done using the Liebert Power Assist software via the USB port. Visit www. vertiv.com/
powerassist for additional information.
2.8 Emergency Power O (EPO) Connection (Optional)
To comply with national and local wiring codes and regulations, the EPO connector internally disconnects
all power sources to equipment connected to the UPS. The default operation is “active open” which means
you must remove the factory-installed jumper and connect to external contacts that are normally closed
but which open during a power-o event. The logic may be reversed in the Settings; see Conguring UPS
with the Settings Menu on page 23. If you do not use the EPO connector, leave the factory-installed
jumper in place and the default EPO settings in the Settings.
2.9 External Battery Cabinet Connection on 2U Models
(Optional)
External battery cabinets provide longer battery run time for connected devices. Refer to Specications
on page 31, and Run Times on page 38, to select the appropriate model and quantity for your PSI5
model and applications. You can connect up to six battery cabinets to the 2U PSI5 models. LI, MT, and 1U
models do not support external battery cabinets.
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