Liebert Surge Protector 350 500 VA User Manual

POWER AVAILABILITY  
USER MANUAL  
PowerSure™ PST  
350-500 VA  
120V  
 
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
Guide to Status Indicators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15  
Troubleshooting Chart. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16  
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17  
Battery Run Times. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18  
Product Warranty Registration. . . . . . . . . . . . . . . . . . . . . . . . . 18  
i
 
 
IMPORTANT SAFETY INSTRUCTIONS  
SAVE THESE INSTRUCTIONS  
This manual contains important safety instructions that should be fol-  
lowed during the installation and maintenance of the Uninterruptible  
Power System (UPS) and its batteries. Please read this manual thor-  
oughly before attempting to install or operate this UPS.  
Read all safety, installation, and operating instructions before operat-  
ing the UPS. Adhere to all warnings on the unit and in this manual.  
Follow all operating and user instructions.  
This equipment is designed for Commercial, Industrial or Residential  
use. Liebert Corporation neither recommends nor knowingly sells this  
product for use in life support applications or with other designated  
critical devices.  
This equipment can be installed and operated by individuals without  
previous training.  
WARNING  
!
SAFETY PRECAUTIONS  
• To prevent the risk of fire or electric shock, install the UPS  
in a temperature and humidity controlled room, free of  
conductive contaminants, moisture, flammable liquids,  
gases and corrosive substances.  
• Operate the UPS only from a properly grounded (earthed)  
120VAC, 60Hz AC supply.  
• To reduce the risk of electric shock, do not remove the  
cover, as it has no user-serviceable parts inside except the  
internal battery pack. Some components are live, even  
when AC power is disconnected. For service, contact a  
qualified technician.  
1
 
 
CAUTION  
!
Although your UPS has been designed and manufactured to  
assure personal safety, improper use may result in electrical  
shock or fire. To ensure safety, please observe the following  
rules:  
• Turn off and unplug your UPS before cleaning. Do not use  
liquid or aerosol cleaners. A dry cloth is recommended to  
remove dust from the surface of your UPS.  
• Do not install or operate your UPS in or near water.  
• Do not place your UPS on an unstable cart, stand or table.  
• Do not place your UPS in direct sunlight or near heat  
emitting sources.  
• Never block or insert any objects into the ventilation holes  
or other openings of the UPS. Keep all vents free of dust  
accumulation that could restrict airflow.  
• Do not place UPS power cord in any area where it may be  
damaged by heavy objects.  
• Placing magnetic storage on the top of the UPS may result  
in data corruption.  
CAUTION  
!
If your UPS demonstrates any of the following conditions,  
turn off and unplug your UPS from the outlet and contact  
your local dealer, Liebert representative, or Liebert  
Worldwide Support Group.  
• The power cord is damaged.  
• Liquid has been spilled on the UPS.  
• The circuit breaker or fuse opens frequently.  
• The UPS does not operate in accordance with the user  
manual.  
Provided is a USB cable for connection to a computer. Store in a safe  
place if not required at this time.  
2
 
CONDITIONS OF USE: The input receptacle must be within 6 feet  
(1.8 meters) of the UPS.  
Your UPS provides conditioned power to connected equipment. Maxi-  
mum load must not exceed that shown on UPS rating label. If uncer-  
tain, consult your local dealer, Liebert representative or the Liebert  
Worldwide Support Group.  
The equipment can be installed and operated by individuals without  
previous training.  
CAUTION  
!
BATTERY HANDLING PRECAUTIONS  
Servicing of batteries should be performed or supervised by  
personnel knowledgeable of batteries and required  
precautions. Keep unauthorized personnel away from the  
batteries.  
A battery can present a risk of electrical shock and high  
short-circuit current. The following precautions should be  
observed when working on batteries:  
• Remove watches, rings, and other metal objects.  
• Use tools with insulated handles.  
• Do not dispose battery or batteries in a fire. The battery  
may explode.  
• Do not open or mutilate the battery or batteries. Released  
electrolyte is harmful to skin and eyes. It may be toxic.  
• When replacing the battery, use same number and type of  
battery as the suitable recommended type of battery listed  
in specification table in back of this manual.  
• Handle, transport and recycle batteries in accordance with  
local regulations.  
3
 
INTRODUCTION AND SYSTEM DESCRIPTION  
Congratulations on your choice of the Liebert PowerSure™ PST Unin-  
terruptible Power System (UPS). It provides filtered AC power to sen-  
sitive electronic equipment and other critical loads.  
The PowerSure PST is an off-line UPS designed for desktop applica-  
tions. It provides perfect one-to-one power protection for electronic  
equipment such as PCs, point-of-sale displays, home office equipment  
and similar electronic gear. The PowerSure PST is available in two (2)  
sizes: 350 and 500VA at 120VAC.  
PowerSure PST models are available for 120VAC and 230VAC supply  
voltages and loads. Please verify that this model matches your AC  
Utility and load voltage requirements.  
NOTE  
This device complies with part 15 of the FCC Rules.  
Operation is subject to the following two conditions: (1) This  
device may not cause harmful interference, and (2) this device  
must accept any interference received, including interference  
that may cause undesired operation.  
This equipment uses, generates and can radiate radio  
frequency energy and, if not installed and used in accordance  
with the instructions, may cause harmful interference with  
radio communications. However, there is no guarantee that  
interference will not occur in a particular installation.  
If this equipment does cause harmful interference to radio or  
television reception, which can be determined by turning the  
equipment off and on, the user is encouraged to try to correct  
the interference by one or more of the following measures:  
• Reorient or relocate the receiving antenna.  
• Increase the separation between the UPS and the receiver.  
• Connect the UPS into an outlet on a circuit different from  
the one on which the receiver is connected.  
4
 
 
Top and Side Views of UPS  
Black output receptacles  
Surge protection only  
TOP OF UPS  
Utility/Battery Indicator  
(Green)  
Site Wiring Fault  
Indicator (Amber)  
Fault Indicator (Red)  
Orange output receptacles  
Battery backup + surge protection  
RIGHT SIDE OF UPS  
USB  
interface  
port  
LEFT SIDE OF UPS  
Power Cord  
6.5 ft (2 m)  
Data Line  
Protection  
Connectors  
(IN, OUT, OUT)  
Phone/fax/  
modem/DSL  
Refer to Bottom for  
Cautionary Markings  
Circuit Protector  
5
 
 
MAJOR COMPONENTS  
Input  
Output  
L
TVSS &  
EMI/RFI  
Filters  
Transfer  
Switch  
L
Battery  
Charger  
Battery  
Inverter  
N
G
N
G
Transient Voltage Surge Suppression (TVSS) & EMI / RFI  
Filters  
These UPS components provide surge protection and filter electro-  
magnetic interference (EMI) and radio frequency interference (RFI).  
They minimize surges or interference present in the utility line and  
keep the sensitive equipment protected.  
Transfer Switch  
In Normal mode the Transfer Switch passes utility AC power to the  
connected load. When input utility voltage or frequency is outside  
acceptable limits, the transfer switch activates and transfers the UPS  
to battery.  
Battery Charger  
In Normal mode, the Battery Charger converts utility AC power into  
regulated DC power to float charge the battery. It is continuously  
charging the battery whenever the UPS is plugged into a power outlet  
and utility power is within acceptable limits—even if the UPS is  
turned OFF.  
Battery  
The PowerSure PST utilizes a valve-regulated, nonspillable, lead acid  
battery. To optimize battery life, operate the UPS in an ambient tem-  
perature of 68°-77°F (20°-25°C).  
Inverter  
When utility power fails, the Inverter draws energy from the battery  
and inverts it into a regulated stepped sinewave supplying power for  
equipment connected to the orange receptacles.  
6
 
           
WHATS INCLUDED  
The PowerSure PST is shipped with the following items:  
• PowerSure PST user manual  
• USB cable, 6 ft. (1.8m)  
• RJ-11 cord, 7 ft. (2.1m)  
• Warranty card  
USB cable  
6-ft. (1.8m)  
RJ-11 cord  
7-ft. (2.1m)  
PowerSure PST  
7
 
 
INSTALLATION  
This UPS is designed for data processing equipment. Maximum load  
must not exceed that shown on the UPS rating label. Do not connect  
equipment that could overload the UPS or draw half-wave current  
from the UPS, for example: electric drills, vacuum cleaners, laser  
printers or hair dryers. Your total load earth leakage current must not  
exceed 3.5 mA. Most data processing equipment meets this require-  
ment if you use no more than two pieces of equipment. If uncertain  
about your load, consult your local dealer, Liebert representative, or  
Liebert Worldwide Support Group.  
1. Visually inspect the UPS for freight damage. Report damage to the  
carrier and your local dealer, Liebert representative or the Liebert  
Worldwide Support Group.  
2. Decide where to place the PowerSure PST. 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 an ambient temperature range of 32°F to  
104°F (0°C to 40°C).  
NOTE  
UPS operation in temperatures above 77°F (25°C) reduces  
battery life.  
Plug this type of equipment into black  
receptacles ONLY.  
Inkjet  
Printer  
Scanner  
FAX  
Machine  
Plug computers, monitors & network hubs  
into orange receptacles.  
3. Plug the PowerSure PST’s attached 6.5-ft. (2m) power cord into an  
AC outlet. Check that the Site Wiring Fault Indicator is not illumi-  
nated. If it is lit, refer to the Troubleshooting section.  
4. Plug any computers and monitors into the orange battery backed up  
receptacles.  
8
 
 
Other office machines that do not exceed the capacity of the UPS—  
inkjet printers, scanners and fax machines—may be plugged into  
either of the two (2) black receptacles, which provide surge protec-  
tion only.  
5. Connect Phone/Fax/DSL/Internet/Modem devices to data line con-  
nectors.  
r to Bottom for  
ionary Markings  
6. Press and release the ON/OFF/Alarm Silence button to turn on the  
UPS. The UPS will beep and the Utility/Battery Indicator will illu-  
minate (green).  
7. Turn on connected equipment.  
8. Connect the USB cable provided with the UPS to the USB ports on  
the PST and your computer. The PST will work automatically with  
your built-in power management software on Windows XP and 2000  
and Mac OS 10.2 or later (see USB Interface Port section for  
details).  
NOTE  
When using the communication features on this UPS, ensure  
the cabling connected to the UPS communications ports are  
kept separated from the power leads to the UPS input and  
output.  
9
 
CONTROLS AND INDICATORS  
ON/OFF/Alarm Silence Button  
This button controls output power to the  
connected load and has three functions:  
• ON  
• OFF  
• Alarm Silence  
ON/OFF/Alarm Silence  
ON  
When the UPS is off, pressing the main ON/OFF button for  
more than two seconds will start the UPS, and an audible  
alarm sounds briefly. The UPS is capable of starting on bat-  
tery (battery start).  
OFF  
When the UPS is on (in either Normal or Battery mode),  
pressing the main ON/OFF button for more than  
two (2) seconds will shut down the UPS. An audible alarm  
sounds briefly.  
Alarm When a UPS audible alarm is active, pressing and releasing  
Silence the main ON/OFF button will silence the active audible  
alarm, whether utility power is present or not. Once the  
alarm silence function has been activated, all active audible  
alarms—except for low battery or overload conditions—will  
remain silenced until a new alarm condition is detected.  
NOTE  
Do not hold ON/OFF button down for more than 2  
seconds or the UPS will shut down.  
10  
 
   
Status Indicators: Utility/Battery, Fault  
There are two (2) status indicators on the top panel of the UPS, as  
shown in the diagram below. Each indicator illuminates to specify the  
status of the UPS (see Troubleshooting section for details).  
Utility/Battery Indicator (Green)  
The Utility/Battery Indicator illuminates when the UPS is operating  
in Normal mode, supplying power to connected loads. The Utility/Bat-  
tery Indicator flashes when the UPS is operating in Battery mode.  
Site Wiring Fault Indicator (Amber)  
The Site Wiring Fault Indicator flashes amber when the UPS detects  
a line-neutral reversal or a poor neutral-ground bonding.  
Fault Indicator (Red)  
The Fault Indicator illuminates when the UPS detects an internal  
fault. It flashes if the UPS detects an overload condition.  
Location and Status of Indicators  
Utility/Battery Indicator (Green)  
Site Wiring Fault Indicator (Amber)  
Fault Indicator (Red)  
11  
 
         
MODES OF OPERATION  
Normal Mode  
-
+
During Normal mode operation, the Power-  
Sure PST supplies conditioned, computer-  
grade power to the connected equipment: util-  
ity power passes through the TVSS circuitry,  
EMI/RFI filters and then through the Trans-  
fer Switch to the connected equipment.  
Continuous LED  
illumination denotes  
Normal Mode  
When the UPS is in Normal mode, the  
Utility/Battery Indicator illuminates green.  
The PowerSure PST continuously monitors the batteries to maintain  
them in a fully charged state. The battery charger operates whenever  
AC power is present, even if the UPS is switched off. The UPS per-  
forms an automatic battery test after it has been operating continu-  
ously for two (2) weeks.  
Battery Mode  
-
+
The UPS switches to Battery mode in the  
event of an extreme voltage/frequency condi-  
tion or complete utility failure. The battery  
system supplies power through the Inverter to  
When the UPS is in Battery mode, the Utility/  
Battery Indicator flashes green and an alarm  
sounds every 5 seconds.  
Flashing LED  
illumination denotes  
Battery Mode  
When a low battery condition occurs, the Battery Indicator continues  
to flash green and the alarm sounds every half-second. Low battery  
warning is initiated when approximately two (2) minutes of battery  
run time are remaining. For more information, refer to Trouble-  
shooting section.  
CAUTION  
!
Turning off the UPS while in either Normal mode or Battery  
mode will result in the loss of output power.  
NOTE  
Once utility power is restored, the UPS resumes normal  
operation. At this time, the battery charger begins recharging  
the battery. The UPS is capable of OFF-State charging, i.e.,  
with utility power, the UPS will charge the batteries as long  
as it is plugged in.  
12  
 
     
COMMUNICATIONS  
USB Interface Port  
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  
manages the automatic, orderly shutdown of the computer. The UPS  
(USB) communications meets HID standard, 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.  
Microsoft, Windows, and the Windows logo  
are trademarks, or registered trademarks of  
Microsoft Corporation in the United States  
and/or other countries.  
Data Line Protection Connectors  
Data line (1 input & 2 outputs) connectors are located on the rear of  
the UPS and provide transient voltage surge suppression (TVSS) for  
Phone/Fax/DSL/Internet/Modem devices.  
13  
 
     
MAINTENANCE  
The PowerSure PST UPS requires very little maintenance. Follow  
these practices to prevent problems.  
Cleaning the UPS  
The following will help ensure trouble-free operation for years:  
• Vacuum dust from the ventilation intake occasionally.  
• Wipe the cover periodically with a dry cloth.  
Maintaining Batteries  
The batteries are valve-regulated, nonspillable, lead acid and must be  
kept charged to retain their design life. The UPS continuously charges  
the batteries when connected to the utility supply, even while the UPS  
is switched off.  
When storing the UPS, it is recommended to plug in UPS for at least  
24 hours every four to six months to ensure full recharge of the batter-  
ies.  
14  
 
     
TROUBLESHOOTING  
The information below indicates various symptoms a user may  
encounter in the event the PowerSure PST experiences a problem. Use  
this information to determine whether external factors caused the  
problem. See Troubleshooting Chart for suggested remedy.  
1. The Fault Indicator illuminates, indicating  
the UPS detected a problem.  
2. An alarm sounds, alerting that the UPS  
requires attention. The alarm can be  
silenced except for low battery and overload  
warning conditions.  
3. Utility/Battery Indicator may be illumi-  
nated as a diagnostic aid to the operator, as  
shown below:  
Fault  
Utility/Battery  
Indicator  
Indicator  
Site Wiring  
Fault Indicator  
Guide to Status Indicators  
Fault  
(Red)  
Site Wiring Utility/Battery  
Fault (Amber)  
(Green)  
Diagnosis/  
Audible Alarm  
-
+
!
Normal Mode  
UPS is operating in Normal  
Mode; no beep.  
ON  
Flashing  
Battery Test has been initiated;  
no beep.  
Flashing  
ON  
ON  
ON  
Site Wiring Fault; no beep.  
The unit is overloaded; beep  
every half-second  
Flashing  
ON  
The UPS has failed;  
continuous beep  
Unit has shut down due to  
overload; continuous beep  
Flashing  
The UPS shut down due to  
failure; continuous beep  
ON  
Battery Mode  
The UPS is operating in  
Flashing Battery mode; beep every 5  
seconds.  
UPS battery is low; beep every  
Flashing  
half-second  
The unit is overloaded; beep  
Flashing  
Flashing  
ON  
every half-second  
The UPS has failed;  
Flashing  
continuous beep  
15  
 
   
Troubleshooting Chart  
If the UPS fails to operate properly, turn off the unit and repeat the  
steps in the Installation section of this manual. If the problem per-  
sists, refer to the chart below:  
Problem  
Cause  
Solution  
Check the circuit protector on the side  
of the UPS. If it is tripped, reset it and  
restart the UPS.  
For further help, call your local dealer,  
Liebert representative or the Liebert  
Worldwide Support Group.  
UPS will not  
start  
Overload/  
Short circuit  
UPS not plugged in  
Plug in power cord securely.  
Circuit protector  
tripped  
Reset the circuit protector and restart  
the UPS.  
Power not available  
at utility receptacle  
Have the utility receptacle checked by  
a qualified electrician.  
UPS starts  
on battery,  
but will not  
switch to AC  
Wait until the voltage rises to an  
appropriate level or have the utility  
receptacle checked by a qualified  
electrician.  
Input voltage below  
threshold  
Wait until voltage lowers to an  
appropriate level or have the utility  
receptacle checked by a qualified  
electrician.  
AC overvoltage  
Overload/  
Short circuit  
Check the circuit protector on the rear  
of the UPS. If it is tripped, reset it and  
restart the UPS.  
If the problem persists, disconnect  
some of the equipment from your  
UPS—the total wattage of your  
equipment must not exceed the  
capacity of the UPS. For further help,  
call your local dealer, Liebert  
representative or the Liebert  
Worldwide Support Group.  
UPS shuts  
down, Fault  
Indicator lit  
Internal UPS fault  
Site Wiring  
Fault  
Indicator  
illuminated  
Line-neutral  
reversal/Poor  
ground connection  
Have the utility checked by a qualified  
electrician.  
Overload  
Reduce load.  
UPS not  
providing  
expected  
backup time  
Battery not charged  
due to a recent  
outage  
Recharge battery.  
16  
 
 
SPECIFICATIONS  
Model Number  
PA350-120U  
PA500-120U  
Model Rating VA / W  
DIMENSIONS: in (mm)  
350/225  
500 / 300  
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)  
Unit 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)  
Shipping W x D x H  
WEIGHT: lbs (kg)  
Unit  
Shipping  
11.7 (5.3)  
12.1 (5.5)  
13.5 (6.1)  
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  
OUTPUT AC PARAMETERS  
6.5 ft.attached, w/ NEMA 5-15 P  
(3) NEMA 5-15R (orange) battery backup+surge protection  
(2) NEMA 5-15R (black) surge protection  
Output Receptacles  
Voltage (Battery Mode)  
Output Current  
120VAC ±8%  
2.9 A  
4.2 A  
Waveform (Battery Mode)  
Frequency (Battery Mode)  
Overload Warning  
Overload Shutdown  
BATTERY PARAMETERS  
Type  
Quantity x Voltage x Rating  
Transfer Time  
Back-up Time:  
Stepped Sinewave  
60Hz ±1Hz  
>100%  
>110%  
Valve-regulated, nonspillable, lead acid  
1 x 12V x 5 Ah 1 x 12V x 7 Ah  
4 – 6 ms typical  
At 77°F (25°C), resistive loading, w/ fully charged batteries:  
Full load  
5 minutes  
3 minutes  
Half load  
16 minutes  
15 minutes  
12 hours to 90% capacity, after full discharge into  
resistive load  
Recharge Time  
ENVIRONMENTAL  
Operating Temperature  
Storage Temperature  
Relative Humidity  
Operating Elevation  
Audible Noise  
+32°F to + 104°F (0°C to +40°C)  
+5°F to + 122°F (-15°C to +50°C)  
0% to 95%, non-condensing  
Up to 10,000 ft. (3000 m) at 86°F (30°C) w/o derating  
< 40 dBA, at 1 meter  
AGENCY  
Safety  
UL 1778, c-UL Listed  
ANSI C62.41, Category A, Level 3, (IEEE 587, Category A);  
EN61000-4-5, Level 3, Criteria A  
Surge  
ESD  
EN61000-4-2, Level 3, Criteria A  
EN61000-4-3, Level 2, Criteria A  
EN61000-4-4, Level 3, Criteria A  
FCC Part 15, Subpart B, Class B  
EN61000-3-2  
Susceptibility  
Electrical Fast Transient/Burst  
Emissions  
Harmonics  
Conducted Immunity  
Flicker  
EN61000-4-6  
EN61000-3-3  
Transportation  
ISTA Procedure 1A  
17  
 
 
Battery Run Times  
Load %  
5
350VA  
168  
87  
51  
29  
20  
16  
11  
9
500VA  
318  
84  
48  
28  
18  
15  
10  
8
10  
20  
30  
40  
50  
60  
70  
80  
7
6
90  
6
4
100  
5
3
Note: Approximate discharge times are in minutes and  
at 77°F (25°C) with resistive load.  
Product Warranty Registration  
To register for warranty protection:  
• Visit the Quick Links section of our Web site at:  
• Click on Product Warranty Registration and fill in the form.  
If you have any questions, please contact us at:  
US: 800-222-5877  
Outside the US: 614-841-6755  
18  
 
   
 
POWER AVAILABILITY  
PowerSure™ PST  
USER MANUAL  
Technical Support/Service  
The Company Behind the Products  
Web Site  
Monitoring  
800-222-5877  
With over a million installations around the globe,  
Liebert is the world leader in computer protection  
systems. Since its founding in 1965, Liebert has  
Outside the US: 614-841-6755  
developed  
a
complete range of support and  
protection systems for sensitive electronics:  
Single-Phase UPS  
800-222-5877  
Environmental systems—close-control air  
conditioning from 1 to 60 tons  
Power conditioning and UPS with power  
ranges from 300 VA to more than 1000 kVA  
Integrated systems that provide both  
Outside the US: 614-841-6755  
Three-Phase UPS  
800-543-2378  
Environmental Systems  
environmental and power protection in  
single, flexible package  
a
800-543-2778  
Outside the United States  
Monitoring and control—from systems of any  
size or location, on-site or remote  
Service and support through more than 100  
service centers around the world and a 24/7  
Customer Response Center  
614-888-0246  
Locations  
United States  
1050 Dearborn Drive  
P.O. Box 29186  
Columbus, OH 43229  
While every precaution has been taken to ensure  
the accuracy and completeness of this literature,  
Liebert Corporation assumes no responsibility and  
disclaims all liability for damages resulting from use  
of this information or for any errors or omissions.  
Italy  
Via Leonardo Da Vinci 8  
Zona Industriale Tognana  
35028 Piove Di Sacco (PD)  
+39 049 9719 111  
Fax: +39 049 5841 257  
Asia  
23F, Allied Kajima Bldg.  
138 Gloucester Road  
Wanchai  
© 2003 Liebert Corporation  
All rights reserved throughout the world.  
Specifications subject to change without notice.  
Hong Kong  
+852 2 572 2201  
Fax: +852 2 831 0114  
® Liebert and the Liebert logo are registered  
trademarks of Liebert Corporation. All names  
referred to are trademarks or registered  
trademarks of their respective owners.  
SL-23275 (3/03) Rev. 1  
 

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