Vertiv Liebert PST5™ Installer/User Guide

Important Safety Information

This manual contains critical safety instructions for the installation and maintenance of the UPS and its batteries. Users must read this manual thoroughly, along with additional safety and regulatory information available at https://www.vertivco.com/ComplianceRegulatoryInfo, before installing, connecting, or operating the UPS.

1 PST5 Description

The Liebert® PST5 is an off-line/stand-by Uninterruptible Power Supply (UPS) designed to provide reliable power protection for small home/office computers, network gear, and home-entertainment equipment. It offers user-friendly operation and sufficient run time to save work in process during power outages.

1.1 Available Models

1.2 Controls and Features

PST5-350MT120 and PST5-500MT120 Controls

The front panel features a power button, a red Fault LED, and a green Mode LED. The rear panel includes surge-protected-only output power receptacles, battery-backed and surge-protected output power receptacles, an input power cord, an input circuit breaker, and RJ11/45 connectors for phone/fax/modem or network surge protection. A USB Type B connector is provided for communication with a PC for UPS monitoring and shutdown.

PST5-660MT120 and PST5-850MT120 Controls

These models include all features of the 350/500 series, plus a scroll button, an LCD display with icons and numerical information, a USB charging port (5V, 2.0A), and Coax Cable connections for cable modem, DSS receiver, or cable-TV converter surge protection.

2 Installation

2.1 What's Included

• USB cable (2 m / 6.5 ft)
• Coax cable (1 m / 3 ft) - for PST5-660MT120 and PST5-850MT120 models only
• Quick Installation Guide
• Safety and Regulatory Guidelines
• Wall-mounting template

2.2 Unpacking and Inspection

Inspect the UPS for shipping damage immediately upon receipt. Report any damage to the carrier or your Vertiv representative. Verify all accessories are included; contact your local dealer or Vertiv representative for discrepancies.

2.3 Preparation for Installation

2.3.1 Installation Environment

• Install the UPS indoors in a controlled environment where it cannot be accidentally turned Off.
• Ensure unrestricted airflow around the unit, away from water, flammable liquids, gases, corrosives, and conductive contaminants. Avoid direct sunlight.
• The socket outlet should be nearby and easily accessible.
• This UPS is not for use in a computer room as defined by ANSI/NFPA 75.

NOTE: Operating the UPS in temperatures above 77°F (25°C) reduces battery life.

2.3.2 Installation Clearances

Maintain at least 4 inches (100 mm) clearance in the front and rear. Do not obstruct air inlets to ensure proper ventilation and heat dissipation, which extends the UPS's service life.

2.4 Installing the UPS

2.4.1 Connecting Loads

The UPS has 4 battery-backed and surge-protected receptacles, and 4 surge-protected-only receptacles. Plug critical equipment (e.g., computers, monitors) into battery-backed receptacles and less-critical equipment (e.g., printers, peripherals) into surge-only receptacles. Do not exceed the UPS's output-load rating.

2.4.2 Connecting for Network or Telephone Protection

Surge protection for computer networks or telephones is provided via RJ11/45 ports on the rear panel. Connect the "IN" port to the wall jack line and the "OUT" port to your device. This feature is optional for UPS operation.

2.4.3 Connecting for Television/Cable Protection

NOTE: For PST5-660MT120 and PST5-850MT120 models only.

Coax surge-protection ports on the rear panel protect cable modems, DSS receivers, or cable-TV converters. Connect the "IN" port to the wall jack line and the "OUT" port to your device. This feature is optional for UPS operation.

2.4.4 USB Communication Connection

Connect the PST5 to a computer via USB for unattended, controlled shutdown during power failures. The UPS works with built-in Microsoft® Windows® operating system software. Plug the provided USB cable into the USB Type-B port on the UPS side panel and the other end into an open USB port on your computer. This feature is optional for UPS operation.

2.4.5 USB Charging Ports

NOTE: For PST5-660MT120 and PST5-850MT120 models only.

The PST5 includes an easily-accessible, side-panel USB Type-A charging port (5V, 2.0A) for phones and other small USB-powered devices. Devices can be plugged in at any time during installation and operation.

2.4.6 Connecting AC Input

Ensure all loads are powered off first. Connect the UPS to a properly grounded input-power supply/wall outlet protected by a circuit breaker, in accordance with national and local electrical codes. Once plugged in, the UPS begins charging the battery.

NOTE: Vertiv recommends allowing the UPS to be plugged into AC input and to charge the battery for at least 12 hours prior to providing full backup time protection for any utility-power abnormality.

3 Operation

NOTE: In all modes, including Off mode, the UPS always provides surge protection and input-breaker protection to all outlets. Surge-only outlets always have the same voltage as the UPS input voltage, even when the UPS is Off, and are not voltage regulated, battery backed-up, or switched by the UPS.

3.1 Modes of Operation

• 3.1.1 Off Mode

  UPS input is connected to a stable 120-VAC source, but battery-backed-up outlets are off. Internal batteries are charging. Surge-only outlets still have power.

• 3.1.2 On/Normal Mode

  UPS input is connected to a stable 120-VAC source, and battery-backed-up outlets are on. Internal batteries are charging.

• 3.1.3 On/Battery Mode

  UPS input is disconnected, or voltage is extremely low/high and unusable. The UPS automatically switches to internal battery power for battery-backed-up outlets. Surge-only outlets will not have power.

• 3.1.4 Fault Mode

  An error or fault condition has occurred. Battery-backed-up outlets are shut off, and internal batteries are not charging. Surge-only outlets may still have power if the UPS input is plugged in.

• 3.1.5 Battery Self-test Mode

  The UPS performs a 10-second internal battery test. Battery-backed-up outlets are temporarily powered by the internal battery. Self-test occurs at startup, automatically every 8 weeks, or manually by holding the power button for 3 seconds when the unit is On.

3.2 Controls

Buttons on PST5-350MT120 and PST5-500MT120 Models

Power button:

• Press-and-hold for 1 second to cycle between On and Off mode.
• Press-and-hold for 3 seconds to enter battery self-test mode.

Buttons on PST5-660MT120 and PST5-850MT120 Models

Scroll button:

• When On, press to cycle through UPS operating parameters.
• Press-and-hold for 2 seconds during Battery mode to mute the battery-alarm beep.
• Press quickly to wake the display.

Power button:

• Press-and-hold for 1 second to cycle between On and Off mode.
• Press-and-hold for 3 seconds to enter battery self-test mode.
• Press quickly to wake the display.

3.3 Display-panel Indicators

NOTE: The display automatically powers-off to conserve power but remains on for warnings or faults.

LED Indicators on PST5-350MT120 and PST5-500MT120 Models

• Warning/Fault (Red LED): Indicates a warning or fault. Refer to Warnings (page 17) and Faults (page 18) for details.
• On/AC/Battery (Green LED): Solid when UPS is in On/Normal mode. Blinking when UPS is in On/Battery mode.

LCD Display on PST5-660MT120 and PST5-850MT120 Models

The LCD displays various icons and numerical information:

• Battery mode indicator (when lit).
• Battery-mode alarm muted indicator (when lit).
• Normal mode indicator (when lit).
• Output-overload warning (flashing).
• Output-load level graph (in 25% increments).
• Numeric display for UPS operational parameters: VAC (input/output voltage) and Hz (input/output frequency).
• Fault indicator (when lit) with fault codes (E01, E04, E05, E06).
• Battery-capacity graph (in 25% increments).

3.4 Audible-tone Indicators

3.5 Warnings

The UPS provides early-warning indicators before output shutdown.

Warning Indicators and Actions for PST5-350MT120 and PST5-500MT120 Models

• Red LED On solid, 1 beep every second: Output-overload. Reduce load below UPS rating.
• Red LED Blinking, 2 beeps every 5 seconds or 3 beeps every 30 seconds: Weak or damaged battery. Charge battery for at least 12 hours or replace it.

Warning Indicators and Actions for PST5-660MT120 and PST5-850MT120 Models

• "OVERLOAD" icon, 1 beep every second: Output-overload. Reduce load below UPS rating.
• "LOW BATT" icon, 3 beeps every 30 seconds: Weak or damaged battery. Charge battery for at least 12 hours or replace it.

3.6 Faults

For PST5-350MT120 and PST5-500MT120 models, a solid red Warning/Fault LED with a continuous audible tone indicates a fault and automatic output shutdown. To troubleshoot: turn off UPS, disconnect loads, restart. If fault persists, contact Vertiv technical support. If fault clears, plug in equipment one at a time to identify the cause.

PST5-660MT120 and PST5-850MT120 models display fault codes when a problem is detected and output power shuts off.

Fault Codes and Actions for PST5-660MT120 and PST5-850MT120 Models

3.7 Normal Start-up

With the UPS connected to AC input, press-and-hold the power button for 1 second. A long tone and 2 short beeps indicate battery self-test mode. After a successful self-test, outlets are on.

3.8 Normal Shut-down

1. Press-and-hold the power button for 1 second to turn off outlets.
2. Disconnect AC-input power.
3. Remove battery cover and disconnect battery connector.

3.9 Full Shut-down

1. Press-and-hold the power button for 1 second to turn off outlets.
2. Disconnect AC-input power.
3. Remove battery cover and disconnect battery connector. The unit is fully shut down.

4 Maintenance and Battery Replacement

4.1 Precautions

Observe the following safety precautions:

• Turn off and unplug the UPS before cleaning.
• Clean with a dry cloth; do not use liquid or aerosol cleaners.
• Never block or insert objects into ventilation holes.
• Do not place the power cord where it might be damaged.

4.2 Battery Charging

The UPS uses valve-regulated, non-spillable, lead-acid batteries that charge continuously when connected to utility power. For long-term storage, connect the UPS to input power for at least 24 hours every 4 to 6 months to ensure full battery recharge.

4.3 Battery Replacement

IMPORTANT! Review battery safety precautions at https://www.vertivco.com/ComplianceRegulatoryInfo before proceeding. Replacement battery part numbers are listed in the Specifications section.

To replace the battery:

1. Power off the UPS and disconnect input power.
2. Turn the UPS upside down.
3. Remove the battery-compartment screw, then slide off the cover.
4. Lift the white tab and pull the battery out.
5. Disconnect the red battery connector, then the black battery connector.
6. Orient the replacement battery identically to the removed one. Connect the black battery connector, then the red battery connector.

   NOTE: A small spark when connecting the last wire to the battery is normal.

7. Seat the battery fully, replace the compartment cover and screw.
8. Press-and-hold the power button for 3 seconds to initiate a battery self-test and clear any previous battery fault warning.
9. Dispose of old batteries at an appropriate recycling facility or return them to Vertiv in the new battery's packing material.

4.4 Specifications

The Liebert PST5 series offers various models with different capacities and features. Key specifications include:

• Capacity: Ranging from 350 VA/200 W (PST5-350MT120) to 850 VA/500 W (PST5-850MT120).
• Dimensions (W x D x H): All models are 12 x 6.24 x 3.82 inches (305 x 158.5 x 97 mm).
• Weight: Ranging from 6.6 lbs (3.0 kg) to 9.7 lbs (4.4 kg).
• Input AC: Nominal Voltage 120 VAC, Voltage Range 90-145 VAC, Frequency Range 60 Hz ±5 Hz. Internal rear-panel input breaker ratings vary by model (5A, 7A, 10A at 250 VAC). Surge Energy Rating is 316 Joules.
• Output AC (On Utility): Nominal Voltage 120 VAC, Voltage Range 90-145 VAC, Frequency Range 60 Hz ±5 Hz, Efficiency >95% at full load.
• Output AC (On Battery): Nominal Voltage 120 VAC, Voltage Range Nominal ±8% at onset, ±15% at EOD, Frequency Range 60 Hz ±1 Hz, Waveform PWM Simulated Sine wave.
• Transfer Time: 6-8 ms typical for 350/500 models, 6 ms typical for 660/850 models.
• Overload Capacity: 100% (alarm warning), 110% (alarm warning and shutdown after 5 minutes), 120% (alarm warning and immediate shutdown).
• Battery Type: Valve Regulated Lead Acid (VRLA).
• Environmental Requirements: Operating Temperature 32-104°F (0-40°C), Operating Elevation 0-9,842 ft (0-3,000 m), Relative Humidity 0-95% non-condensing. Audible Noise <40 dBA at 3 ft (1 m).
• Agency Approvals: cTUVus (UL 1778, CSA 22.2 No. 107.3:2014), FCC part 15 subpart B, Class B.

4.5 Run-time Tables

The document includes tables detailing approximate battery run times for each PST5 model at various load percentages. These run times are based on new, fully charged standard battery modules at 25°C (77°F) with 100% resistive UPS loading. For example, a PST5-850MT120 at 10% load provides approximately 50 minutes of run time, while at 100% load, it provides about 1.5 minutes.

Appendices

Appendix A: Technical Support

Vertiv Technical Support staff are available to assist with installation or operating issues related to Liebert® products. Contact information:

• Technical support email: liebert.upstech@vertivco.com
• Technical support phone: 1-800-222-5877 menu option 1
• Monitoring support email: liebert.monitoring@vertivco.com
• Monitoring support phone: 1-800-222-5877 menu option 2
• Warranty support email: microups.warranty@vertivco.com
• Warranty support phone: 1-800-222-5877 menu option 3