Vertiv LIEBERT PSI5 MINI-TOWER PSI5-1500MT120, Installer And User Manual

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2.7 USB Connection
You can connect the Liebert® PSI5 to a computer via USB allowing unattended, controlled shutdown of your computer in
case of UPS input power failure. The UPS works with the computer running software contained in the Microsoft® Windows®
operating system. Use of this feature is not required for proper operation of the UPS. To use this feature, plug the provided
USB cable into USB Type-B port located on the rear panel of the UPS and the other end into an open USB port on your
computer.
2.8 Emergency Power Off (EPO) Connection (Optional)
To comply with national and local wiring codes and regulations, the EPO connector internally disconnects all power sources
to the UPS and connected equipment. 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-off event. The
logic may be reversed in the Settings; see
Configuring UPS with the Settings Menu on page 30. 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 Specifications on page 37, and
Run Times on page 46, 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.
To connect an external battery pack:
1. Connect one end of the external battery cable to the UPS and one end to the battery cabinet as shown in
Figure 2.6 on the facing page.
2. If connecting more than one external battery, connect one end of the external battery cable to the second
connector on the battery cabinet, the connect the other end to the next battery cabinet as shown in Figure 2.6
on the facing page.
NOTE: After installation and initial startup, set the number of installed battery cabinets in the UPS Settings.
NOTE: When two or more external battery cabinets are used with PSI5-1100/2200/3000/5000 models, the UPS load
rating is decreased by 20%.
Vertiv™ | Liebert® PSI5 Installer/User Guide
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