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1 INTRODUCTION
The Liebert PSI™ XR is a 2U, line-interactive UPS that may be installed in a rack or used as a tower UPS.
Status indicators on the front of the Liebert PSI XR display load level, battery level, buck/boost, site-wiring
fault and battery status. Controls include a combination ON/ Alarm Silence/Manual Self-Diagnostic
button, an Off button and a Display Status Change button.
The Liebert PSI XR has USB, DB-9 (RS-232/contact closure) and SNMP interface ports. The DB-9 and USB
ports provide detailed operating information including voltages, currents, and alarm status to the host
system when used in conjunction with Liebert shutdown software.
Figure 1.1 Front view of UPS
Figure 1.2 1000 and 1500VA—rear view
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