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  • Liebert PSI UPS Brochure

  • Liebert PSI Run Time Chart

  • Liebert PSI Specifications Guide

  • Liebert Power Solutions


Liebert PSI UPS

Emerson Network Power


Liebert PSI is a feature-rich UPS system designed especially for today’s IT applications such as servers, storage, and networking equipment.

Its high power output delivers superior performance on power factor corrected (PFC) power supply and satisfactory backup time in the high demand environment.

Liebert Multilink UPS software protects servers through local USB communication or via network. Matching external battery cabinets offer UPS backup time to several hours in the extended requirements.

The Liebert PSI is ideally suited for:

  • Network Computers
  • Servers
  • Network Closets
  • Computer Rooms
  • Large Network Peripherals
  • Network Storage Devices

Features and Benefits

Lowest Total Cost of Ownership

  • Operates at a high 0.9 power factor that makes it ideal for today’s modern IT equipment, providing 29% more power than typical UPS
  • Reduced installation time and costs — shipped with batteries connected and charged
  • Two-year warranty — no-hassle replacement
  • Supports Liebert Multilink shutdown software

Higher Availability

  • Greater than three minutes of internal battery backup time at 100% load provides ample time for an orderly shutdown of equipment.
  • Buck/boost automatic voltage regulation technology protects against utility voltage fluctuation by raising and lowering utility power to the level needed by connected equipment



  • Eight to nine battery-backed outlets
  • User replaceable and hot-swappable batteries
  • Rack/Tower Convertible with rotatable display panel, 2U in height on all models
  • Multiple remote communications and shutdown options provide remote monitoring and power management — WEB/SNMP, USB, contact closure and remote power off
  • Emerson_Liebert_PSI_Rotatable_Display_PanelRotatable Display Panel
    Rotatable Display Panel 90 degrees rotatable LED display panel rotates
    90° to make the readout  of the LED display easy to see in rack or tower position.

    Automatic Frequency Sensing The UPS automatically adjusts to the input frequency, 50Hz or 60Hz.

Run Time Chart

What's in the Box?

The Liebert PSI is shipped with the following items: 

  • Multi-Language User Manual on CD
  • Liebert MultiLink Software and User Manual, downloadable at multilink.liebert.com
  • Contact Closure (ML9P9S) Cable
  • USB Cable
  • Tower Stand
  • Mounting Hardware
  • Rack-Mount Handles
  • Fixed Mounting Rails
  • EPO Connector
  • Input Power Cord, 2200/3000 only: 2
  • IEC Output Cable, 750/1000/1500 only: 2
  • IEC Output Cable, 2200/3000 only: 3
  • (1) Schuko to IEC-320-C19 and (1) UK plug to IEC-320-C19 input cord, 2200/3000 only
  • (2) IEC-320-C13, 750/1000/1500 only
  • (3) IEC-320-C13, 2200/3000 only

FAQ - Frequently Asked Questions

Why is Emerson launching line-interactive UPS?
Aren't online types better?
  • Online UPs types are better than line interactive ones in terms of power regulation. Online UPS's have outstanding perfomance over poor power conditions such as rural areas and generator power.
  • Many users, especially in places where power conditions are monstly stable and reliable, do not mind whether they use online or line-interactive designs. They look at other features such as runtime, power delivery, communications, size and other factors.

How does a UPS with higher power factor benefit users?

  • UPS is rated both in VA and Watts. Exceeding the specified VA or Watts will cause the UPS to overload. 
  • Modern servers and networking devices are equipped with Power Factor Corrected (PFC) power supply, whose pf is as high as 0.98. It means if power supply is rated at 100VA, it is also rated at 98W. 
  • UPS’s with 1000VA/900Watts can support nine (9) of such devices. UPS’s with 1000VA/700Watts can only support seven (7) of such devices.

Can Liebert PSI have additional USB or RS232 ports?

  • No. PSI has one (1) USB, one (1) contact closure, one (1) remote power off, and one (1) Liebert Intellislot out-of-box. There is no optional card with ports.

Is Liebert IS-WEBCARD compatible with Liebert PSI?

  • Liebert PSI uses a new webcard, IS-WEBRT3, which is totally different from ISWEBCARD used by GXT2/GXT3. They are NOT interchangeable.

Can a Micropod for Liebert GXT2 be use with Liebert PSI?

  • A Micropod is useful when there is UPS fault and it needs to replace UPS.
  • Micropod can be used with Liebert PSI as far as electrical bypass is concerned. However, a Micropod needs to be rack mounted. It does not mechanically fit at the back of a Liebert PSI UPS.

What is the warranty period of Liebert PSI?

  • Standard micro UPS warranty (usually 2 years) applies

What sets Liebert PSI apart from competition?

  • High Power Factor in All Models
         ■ Pf 0.9 in all 5 ratings while competition may offer pf 0.9 on selected  models only and may cause confusion
  • Rack / Tower Convertible in Slim size
         ■ Convenient rack / tower in slim 2U compact design
         ■ Tower stands and rail kits are bundled with Liebert PSI
  • Micropod bypass switch increases availability

Technical Specifications




Six Questions to Ask When Implementing a Data Center Infrastructure Management (DCIM) Solution

Data center managers have been challenged to maintain or increase IT availability, server utilization and efficiency in the face of rising costs and demands. One strategy to help address these challenges is virtualization, which increases server utilization and enables greater energy efficiency.

But virtualization also makes it more difficult to predict the demand on physical systems at any given time. As a result of the uncertainty in physical system demand, the data center manager is compelled to reserve a resource buffer against overload at peak capacity.

A holistic DCIM approach provides new insights into the relationships between facilities and IT infrastructure components, enabling data center managers to better optimize their data center resource consumption.

These are the questions Emerson Network Power recommends data center managers ask before deploying a DCIM solution:

1. What are the critical infrastructure assets in my data center and what are their respective mission interdependencies? An inventory repository can provide the data center manager with a “reality check” of today’s high-value assets, as well as context in the data center plan for tomorrow. This forward-looking insight gives a continual business-oriented view into these critical assets allowing better return-on-investment (ROI) on assets as well as freeing up data center budget for other compelling priorities—a top of mind concern for data center managers.

2. If asked by my management, could I quickly retrieve a comprehensive monitoring and analysis report of all the assets in my data center, and would this report identify bottlenecks? An effective DCIM solution should monitor all space, power and cooling attributes within the data center environment. To avoid an environmental-based operational failure, the DCIM solution should provide reports that enable the data center manager to take proactive action. The ability to report these data center conditions should be available on-demand to the data center manager.

3. Can my data center manage day-to-day workloads with flexibility while servicing on-demand needs as they arrive for my company? The DCIM solution should provide process workflow that can perform:

  • Scenario development—the ability to model changes before they go into production,
  • Nested processes that list steps that must be completed before an action is approved,
  • Measurement against service level agreements (SLAs), which are standard or custom metrics for measuring success, and 
  • The ability to provision into underutilized space, power and cooling capacity. This function should recommend optimal placement for devices based on their unique requirements and the existing load/capacity in the infrastructure.

4. Does this DCIM solution provide the trend analysis and intelligence needed for my team to deliver a comprehensive capacity management plan? To gain control of the current and future usage of data center resources, DCIM solutions should provide data center managers with insight into: 

  • Projection pipelines—what projects are in various stages of approval and what the impact will be on the infrastructure, and 
  • Trending for current and projected utilization (curves based on historical usage). For example, data center management should be able to tell when capacity or cooling will run out, based on utilization trends.

5. What intuitive web-based executive summary and planning tools are provided in the solution? DCIM solutions should provide configurable web-based dashboards and analytics standard within the product. Automating the operational intelligence gathering and reporting through a comprehensive web-based dashboard enables an executive summary that becomes the single source of truth into DCIM and planning. 

6. Will the DCIM solution align with IT and business services? Aligning IT service to address business objectives and needs is paramount. Any DCIM solution must enable data center management to align their respective resource consumption with their current ITSM, ITIL and BSM strategies.

“Data center managers are under more pressure than ever to achieve higher capacities with greater efficiency and less risk of downtime,” said Steve Hassell, president of the Avocent business of Emerson Network Power.“

A holistic DCIM strategy is a data center manager’s best partner in meeting the stringent business demands in a modern-day data center environment.

To successfully implement a DCIM strategy, data center managers must be on the lookout for the best family of hardware, software and services that allows them to address the critical infrastructure gap

Documentation & Downloads

Which UPS is right for you? - Click the banner to proceed.
  • Liebert PSI UPS Brochure

  • Liebert PSI UPS Run Time Chart

  • Liebert PSI UPS Specifications Guide

  • Liebert Power Solutions

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