Emerson 350-500VA Leaflet

PowerSure

™

 PST

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

at 

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

Refer to Bottom for

Cautionary Markings

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

manual on the included CD or at 

 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.

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).

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.)

Model Number

Model Rating VA / W

350/225

500 / 300

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 Receptacles

(3) NEMA 5-15R (orange) battery 

backup+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%

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

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

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.