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PowerSure

 PST

Quick-Start Guide for 350-500VA; 120V

W

HAT

S

 I

N

 T

HE

 B

OX

• Quick-Start guide
• PowerSure family user manual on CD (also 

at 

www.liebert.com

)

• Warranty card
• RJ-11 cord, 7 ft. (2.1 m)
• USB cable, 6 ft. (1.8m)

For more details, refer to the PowerSure user 

manual on CD.
Para una información más detallada, consulte 

el manual

 

del usuario de la familia PowerSure 

en el CD.

Refer to Bottom for

Cautionary Markings

Power ON/OFF/

Alarm Silence

Utility Indicator*

(Green)

Site Wiring Fault Indicator

(Red)

Fault Indicator* (Red/Green)

USB port

Circuit

protector

Output receptacles 

(surge protection

only)

Data Line 

Protection 

Connectors

TOP OF UPS

LEFT SIDE OF UPS

RIGHT SIDE OF UPS

Power cord

6.5 ft. (2m) 

Output receptacles

(battery backup and 

surge protection)

I

NSTALLATION

Read all safety, installation and operating instructions in the PowerSure family user 

manual on the included CD or at 

www.liebert.com

 before operating the UPS. Adhere 

to all warnings on the unit and in the manual.
1. Install the UPS indoors in a controlled environment, where it cannot be accidentally 

turned off. Place it in an area of unrestricted airflow around the unit, away from 
water, flammable liquids, gases, corrosives and conductive contaminants. Maintain 
a minimum clearance of 4 inches (100mm) on each side of the UPS. Maintain an 
ambient temperature range of 32°F to 104°F (0°C to 40°C).

2. Plug the PST’s power cord into an AC outlet. Check the Site Wiring Fault Indicator 

on the rear; if it is illuminated, refer to the 

Troubleshooting

 section.

3. Plug any computers and monitors into the orange receptacles for battery backup 

and surge protection; other office machines that do not exceed the capacity of the 
UPS may be plugged into either of the two (2) black receptacles, which provide 
surge protection only.

4. Connect Phone/Fax/DSL/Internet/Modem devices to data line connectors.
5. Press and release the ON/OFF/Alarm Silence button to turn on the UPS. The UPS will beep and the Utility Indicator will illuminate (green).
6. Turn on connected equipment.

Plug this type of equipment 

into black receptacles ONLY

Plug computers, monitors, 

routers and cash registers into 

orange receptacles

Inkjet 

printers

Scanners

Fax 

machines

C

ONTROLS

 

AND

 I

NDICATORS

This button controls output power to 

the connected load and has three 

functions:
•Turns the PowerSure PST ON
•Turns the PowerSure PST OFF
•Silences PowerSure PST alarms

TURN THE UPS ON: 

Press and release the 

main ON/OFF button to start the UPS. An 

audible alarm will sound briefly.

TURN THE UPS OFF:

 When the PST is ON, 

hold the main ON/OFF button down for more 

than 2 seconds to shut it down. An audible 

alarm will sound briefly.

SILENCE AN ALARM:

 When a UPS alarm is 

active, press and release the main ON/OFF 

button to silence the audible alarm (Excep-

tions: low battery, overload and overtempera-

ture). DO NOT hold the button down for more 

than 2 seconds or the PST will shut down.

CHECK THE PST’S CONDITION:

 Three sta-

tus indicators on the front of the UPS illumi-

nate to specify the status of the UPS (see 

Troubleshooting

 section for details).

SITE WIRING FAULT INDICATOR (AMBER)

The Site 

Wiring 

Fault Indi-

cator on 

the top of 

thePST, 

as shown, 

illumi-

nates amber when the UPS detects a line-

neutral reversal or a poor neutral-ground. 

(See 

Troubleshooting Chart

 if indicator is 

illuminated.)

Site Wiring 

Fault

Indicator 

(Amber)

Top of UPS

S

PECIFICATIONS

Model Number

PA350-120U

PA500-120U

Model Rating VA / W

350/225

500 / 300

DIMENSIONS: in (mm)

Unit W x D x H

6.6 x 9.8 x 3.7

(168 x 250 x 95)

6.6 x 9.8 x 3.7

(168 x 250 x 95)

Shipping W x D x H

9.4 x 13.8 x 5.6

(238 x 350 x 142)

9.4 x 13.8 x 5.6

(238 x 350 x 142)

WEIGHT: lbs (kg)

Unit

11.7 (5.3)

13.5 (6.1)

Shipping

12.1 (5.5)

13.9 (6.3)

INPUT AC PARAMETERS

Surge Protection

603J

Voltage Range Without

Battery Operation

98VAC - 140VAC ±3VAC

Frequency

57 - 63 Hz (±0.4Hz)

Input Power Cord

6.5 ft.attached, w/ NEMA 5-15 P

OUTPUT AC PARAMETERS

Output Receptacles

(3) NEMA 5-15R (orange) battery 

surge protection

(2) NEMA 5-15R (black) surge 

protection

Voltage (Battery Mode)

120VAC ±8%

Output Current

2.9 A

4.2 A

Waveform (Battery Mode)

Stepped Sinewave

Frequency (Battery Mode)

60Hz ±1Hz

Overload Warning 

>100%

Overload Shutdown 

>110%

BATTERY PARAMETERS

Type

Valve-regulated, nonspillable, lead 

acid

Quantity x Voltage x Rating 1 x 12V x 5 Ah

1 x 12V x 7 Ah

Transfer Time

4 – 6 ms typical

Back-up Time:

At 77°F (25°C), resistive loading, w/ 

fully charged batteries:

Full load

5 minutes

3 minutes

Half load

16 minutes

15 minutes

Recharge Time

12 hours to 90% capacity, after full 

discharge into resistive load

ENVIRONMENTAL

Operating 

Temperature

+32°F to + 104°F 

(0°C to +40°C)

Storage

Temperature

+5°F to + 122°F (-

15°C to +50°C)

Relative 

Humidity

0% to 95%, non-

condensing

Operating 

Elevation

Up to 10,000 ft. 

(3000 m) at 86°F 

(30°C) w/o 

derating

Audible Noise

< 40 dBA, at 1 

meter

AGENCY

Safety

UL 1778, c-UL 

Listed

Surge

ANSI C62.41, 

Category A, Level 

3, (IEEE 587, 

Category A);

EN61000-4-5, 

Level 3, Criteria A

ESD

EN61000-4-2, 

Level 3, Criteria A

Susceptibility

EN61000-4-3, 

Level 2, Criteria A

Electrical Fast 

Transient/Burst

EN61000-4-4, 

Level 3, Criteria A

Emissions

FCC Part 15, 

Subpart B,

Class B

Harmonics EN61000-3-2
Conducted 

Immunity

EN61000-4-6

Flicker EN61000-3-3

Transportation

ISTA Procedure 

1A

C

OMMUNICATIONS

The PowerSure PST has a USB interface port for communication that will work with the built-in Microsoft 

Power Manager software on the user’s PC, if the PC is so equipped. It will provide UPS status and man-

ages the automatic, orderly shutdown of the computer. The UPS (USB) communications meets HID stan-

dard, version 1.11. All USB models are compatible with Microsoft Windows 2000, Windows XP and Mac 

OS 10.2 or later. All USB models ship with a 6 ft. (1.8m) USB cable.

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