Emerson Liebert GXT4-10000RT230, User Manual

Page 1: ...Liebert GXT4 UPS 230 V 5000 VA 10 000 VA User Manual ...

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Page 3: ...e Suppression TVSS and EMI RFI Filters 9 1 6 2 Rectifier Power Factor Correction PFC Circuit 9 1 6 3 Inverter 9 1 6 4 Battery Charger 9 1 6 5 DC to DC Converter 10 1 6 6 Battery 10 1 6 7 Internal Bypass 10 1 6 8 Maintenance Bypass 10 1 7 Operating Mode 10 1 7 1 Mains Mode 10 1 7 2 Manual Bypass Mode 10 1 7 3 Battery Mode 11 1 7 4 Battery Recharge Mode 11 1 7 5 Frequency Converter Mode 11 1 7 6 Act...

Page 4: ...minal Block Connections 19 2 7 IT Power System Configuration 20 3 0 Operation and Display Panel 21 3 1 LED Indicators 21 3 2 Control Buttons 22 3 3 LCD 22 3 4 Menu Structure 23 3 4 1 Startup Screen 24 3 4 2 Default Screen 25 3 4 3 Main Menu Screen 25 3 4 4 Prompt List 34 3 4 5 Warning List 34 3 4 6 Fault List 35 4 0 Operation 37 4 1 Startup Checklist for the Liebert GXT4 37 4 2 Starting the UPS 37...

Page 5: ... Low Battery 42 5 4 Remote Emergency Power Off GXT4 6000RTL630 43 6 0 Maintenance 45 6 1 Replacing the Internal Battery Pack 45 6 1 1 Battery Replacement Procedures 46 6 2 Battery Charging 47 6 3 Precautions 48 6 4 Checking UPS Status 48 6 5 Checking UPS Functions 48 7 0 Troubleshooting 49 7 1 UPS Symptoms 49 7 1 1 Indicator and LCD 49 7 1 2 Audible Alarm 50 7 2 Troubleshooting 50 8 0 Specificatio...

Page 6: ...s compartment 20 Figure 3 1 Operation and display panel 21 Figure 3 2 Menu structure 23 Figure 3 3 Startup screen 24 Figure 3 4 Startup screens 24 Figure 3 5 Starting and Start Successful screens 24 Figure 3 6 Default screen 25 Figure 3 7 Main Menu screen 25 Figure 3 8 Status screens 26 Figure 3 9 CONFIGURATION screen 26 Figure 3 10 UPS screens 27 Figure 3 11 Battery screen 27 Figure 3 12 ECO Mode...

Page 7: ...v Liebert GXT4 User Manual Figure 6 2 Disconnecting the battery plug and battery receptacle front view 46 Figure 6 3 Pull out the battery 47 ...

Page 8: ...ings 34 Table 3 4 Warning list 34 Table 3 5 Fault list 35 Table 5 1 Output voltage option 40 Table 6 1 Replacement internal battery pack model number 45 Table 7 1 Description of the displayed fault 49 Table 7 2 Audible alarm description 50 Table 7 3 Troubleshooting table 50 Table 8 1 UPS specifications 53 Table 8 2 Power distribution specifications 54 Table 8 3 External battery cabinet specificati...

Page 9: ... electric shock hazard To ensure human safety and normal UPS operation the UPS must be properly grounded before use When the UPS is connected to an IT power distribution system a short circuit protection device must be installed on the neutral line Install and use the Liebert GXT4 in the following environments Temperature 32 F 104 F 0 C 40 C relative humidity 0 to 95 non condensing Out of direct s...

Page 10: ...he environment electronic cards electronic components The components removed must be taken to specialized collection and disposal centers WARNING Risk of electric shock and explosion Can cause equipment damage injury and death Do not dispose of the battery in a fire The battery may explode Do not open or damage the battery Released electrolyte is toxic and is harmful to skin and eyes If electrolyt...

Page 11: ... possible Please be environmentally responsible and recycle this product through your recycling facility at its end of life Do not dispose of this product as unsorted municipal waste Follow local municipal waste ordinances for proper disposal provisions to reduce the environmental impact of waste electrical and electronic equipment WEEE For information regarding the scrapping of this equipment ple...

Page 12: ...rical shock Indicates caution followed by important instructions AC input AC output Requests the user to consult the manual Indicates the unit contains a valve regulated lead acid battery Recycle DC voltage Equipment grounding conductor Bonded to ground AC voltage WEEE i PbH2SO4 R ...

Page 13: ...iples and operating mode 1 1 Features The UPS includes these features Intelligent battery management to extend battery life LCD for user friendly operation and local monitoring and configuration of operational parameters Flexible network management with Liebert MultiLink software Fan fault self inspection and automated diagnostic function Intelligent fan operation automatically changing rotation s...

Page 14: ...ch has Figure 1 1 Liebert GXT4 5000VA and 6000VA front view 1 3 2 Rear Panel Features The rear panel of the Liebert GXT4 has these features Liebert IntelliSlot Port USB port Input Circuit Breaker Maintenance Bypass Circuit Breaker General Output ReceptaclesExternal Battery Connector Cooling Fan Terminal Block Communication Output Circuit Breakers Upper Bezel Operation and Display Panel Lower Bezel...

Page 15: ... Communication Maintenance Bypass Breaker Output Circuit Breaker Knockouts for Hard wired Power Input Input Circuit Breaker Liebert GXT4 5000 6000VA Removable Power Distribution Box factory attached in bottom left corner Output Circuit Breakers REPO Output Circuit Breakers External Battery Connector Removable Power Distribution Box factory attached in bottom left corner C13 Output Receptacles C19 ...

Page 16: ... internal battery packs behind a battery access door on the front of the unit Each internal battery pack is fitted with a connector to link to the UPS Figure 1 6 Internal battery pack with connector NOTE GXT4 10 000 VA battery pack shown in Figure 1 6 5000 VA and 6000 VA battery packs have the same features Outer Surface View Quick Connect Front View Power Distribution Box for 10000VA model PD2 CE...

Page 17: ...iciently as possible by the UPS The amount of distortion reflected on the mains is reduced This results in cleaner power being available to other devices in the building not being protected by the Liebert GXT4 1 6 3 Inverter In normal operation the inverter utilizes the DC output of the power factor correction circuit and inverts it into precise regulated sinewave AC power Upon a mains power failu...

Page 18: ...des a manual maintenance bypass in a removable section of the rear of the UPS This allows replacement of the UPS in the event of a UPS malfunction while keeping the connected equipment powered with utility power 1 7 Operating Mode The UPS operation modes include the following Mains AC Mode Bypass Mode Battery Mode Battery Recharge Mode Active ECO Mode and Frequency Converter Mode Refer to 3 0 Oper...

Page 19: ...the connected load Can cause equipment damage Turning Off the Liebert GXT4 when it is in Battery Mode will result in loss of output power to the connected load If the UPS is turned Off manually it must be manually restarted after mains power returns If the UPS is turned Off by a communication signal or because the batteries are depleted it will operate as set in the configuration program for Auto ...

Page 20: ...ectrical costs Active ECO mode keeps the rectifier and inverter operating allowing the inverter to remain synchronized to bypass This synchronization allows the transfer of the connected equipment to UPS inverter power almost seamlessly if bypass power falls outside the user set limits Once bypass power returns within the acceptable parameters the UPS will return to Active ECO Mode operation The d...

Page 21: ...pact Disk with Liebert MultiLink Configuration program User manual electronic version Liebert IntelliSlot Unity card IS UNITY DP factory installed not included with units with model number ending with an E USB cable one 1 2 m 3 9 ft Rack mounting hardware including screws handles and mounting rail kit not included with units with model numbers ending with an E Power Distribution Box installed on L...

Page 22: ...ife of the Liebert GXT4 2 4 Install the Main Cabinet The Liebert GXT4 may be installed in either a tower configuration or in a rack depending on available space and use considerations Determine the type of installation and follow the appropriate instructions in either 2 4 1 Tower UPS Installation or 2 4 2 Rack Installation 2 4 1 Tower UPS Installation To install the Liebert GXT4 as a tower 1 Take ...

Page 23: ...ave been rotated 90 degrees clockwise which provides upright viewing for users 5 Place the Liebert GXT4 and any battery cabinets on the support bases Each Liebert GXT4 needs two support assemblies 2 4 2 Rack Installation The Liebert GXT4 UPS and external battery cabinets EBC when installed in a rack enclosure must be supported by a shelf or rack mount rails The Liebert GXT4 UPS and EBC units ship ...

Page 24: ... additional options and any assistance needed Fasten the slides into position with the screws per the instructions included with the slide rails 3 Use the enclosed support bases for the tower option to prevent tip over One additional set of support base extensions ships with each external battery cabinet 4 Verify the External Battery Cabinet breaker is in the Off position 5 Connect the supplied ex...

Page 25: ...ypass interlock bracket behind the captive screw and tighten the screw 2 6 2 Remove the Power Distribution Box 1 Manually transfer the connected equipment to the internal bypass a From the main menu select CONTROL then press Enter b Select TURN ON OFF and press Enter c Select TURN UPS BYPASS and press Enter The UPS will transfer the connected loads to the internal bypass For help refer to 4 4 Manu...

Page 26: ...hat attaches to the rear of the UPS PD2 CE6HDWRMBS fits the 5000 and 6000VA models of the Liebert GXT4 PD2 CE10HDWRMBS fits the 10 000VA model of the Liebert GXT4 The installer must provide an upstream branch circuit breaker The input circuit breaker on the distribution box and the output circuit breaker on the rear of the power distribution box disconnect all power between the main cabinet and th...

Page 27: ...4 6000RT230 32A 4mm2 10AWG 6mm2 8AWG 2 26 Nm 20 in lb GXT4 10000RT230 63A 10mm2 6AWG 16mm2 4AWG NOTE 1 Emerson recommends installing a breaker upstream of unit 2 The installer must provide circuit breaker protection according to local codes The mains disconnect should be within sight of the UPS or have appropriate an appropriate lock out Maintain service space around the UPS or use flexible condui...

Page 28: ...1 Remove screws on the IT Power System Access Cover as shown in Figure 3 2 Disconnect the connectors as shown in figure 3 Install IT Power System Access Cover and screws Figure 3 Remove cover from IT Power System Connectors compartment Remove Screws IT Power System Connectors ...

Page 29: ...panel are Inverter Battery Bypass ECO Mode Fault Figure 3 1 shows the indicators locations their descriptions and functions are shown in Table 3 1 Table 3 1 LED indicators LED Indicators LED Color Description Inverter Green On when the inverter is supplying power Bypass Amber On when the load is supplied by the mains through automatic manual bypass Battery Amber On when the load is supplied by the...

Page 30: ...ol buttons Control Buttons Description ESC Button Pressing this button returns to the previous menu or aborts any change in the input data field before confirming Up Button Pressing this button can move the cursor up or increase the value displayed in the input data field When a menu is displayed on several screens pressing the button can scroll up Down Button Pressing this button can move the cur...

Page 31: ...n UPS Off Address MAC Address IPV4 Address IPV6STATIC Address IPV6AUTO Address IPV6LINK Startup on Bypass Enable Auto Restart Enable Guaranteed Shutdown Frequency Selection Output Level Selection Battery Cabinets Low Battery Time Warning Batt Test Interval Batt Replace Time BATT UPS Turn UPS On Off View Log Clear Log Start Windows System Status Main Menu Network Time Since Startup Battery Input Lo...

Page 32: ...o select YES and press the Enter button The UPS will start up the LCD will display UPS STARTING and then START SUCCESSFUL after the UPS is turned On as shown in Figure 3 5 Figure 3 5 Starting and Start Successful screens No Description 1 Input power is available 2 Input power is not available EMERSON Network Power O P 0V HZ 0 0A I P 120V 60HZ 0 0A BATT 100 320MINS LOAD 0 TURN ON UPS YES NO O P 0V ...

Page 33: ...utes the LCD will enter the screen saver mode backlight turns off It will remain off until a control button is pressed Figure 3 6 Default screen 3 4 3 Main Menu Screen Press the Enter button in the default screen to enter the MAIN MENU screen as shown in Figure 3 7 To select a submenu press the Up or Down button to move the cursor to the required item then press the Enter button to enter its subme...

Page 34: ...u has seven submenus as shown in Figure 3 9 In the CONFIGURATION screen press the Up or Down button to move the cursor to the required item then press the Enter button to enter a submenu or set its parameters Figure 3 9 CONFIGURATION screen VOLTAGE 120V FREQUENCY 60HZ CURRENT 17 6A POWER 2112KWH OUTPUT CAP 90 WATT 1620W VA 1800VA LOAD VOLT 120V FREQ 60 HZ CURR 18 6A POWER 97KWH INPUT CAPACITY 90 R...

Page 35: ...Screen Select MAIN MENU CONFIGURATION BATTERY to enter the BATTERY screen This menu has four screens as shown in Figure 3 11 Press the Up or Down button to increase or decrease the value of the settings and press the Enter button to confirm it Figure 3 11 Battery screen OFF AUDIBLE ALARM NO STARTUP ON BYPASS NO GUARANTEE SHUTDOWN YES ENABLE AUTO RESTART AUTO BYPASS ENABLE FREQUENCY SELECTION 230 V...

Page 36: ...quired item and press the Enter button to confirm the settings Figure 3 12 ECO Mode screen LCD screen Select Main Menu 2 CONFIGURATION 6 LCD to enter the LCD screen This menu has two submenus LANGUAGE and COLOR as shown in Figure 3 13 Figure 3 13 LCD screen No Description 1 Outlet control is on 2 Outlet control is off ON ECO MODE 3 Hz FREQUENCY TOLERANCE 10 VOLTAGE TOLERANCE 5 MINS REQUALIFICATION...

Page 37: ...d them refer to the Configuration Program user manual on the included CD Figure 3 14 Language screen Select 2 COLOR and press the Enter button to enter the COLOR screen as shown in Figure 3 15 Figure 3 15 Color screen FACTORY DEFAULT screen Select MAIN MENU 2 CONFIGURATION 7 FACTORY DEFAULT to enter the FACTORY DEFAULT screen as shown in Figure 3 16 Figure 3 16 Factory Default screen 1 English 2 E...

Page 38: ...ursor to the required item and press the Enter button to enter its submenu Figure 3 17 Control screen TURN ON OFF screen Select MAIN MENU 3 CONTROL 1 TURN ON OFF to enter the TURN ON OFF screen This screen shows one of two displays TURN ON UPS and TURN OFF UPS depending on the state of the UPS as shown in Figure 3 18 Figure 3 18 Turn UPS On or Off screen No Description 1 UPS is off 2 UPS is on 1 T...

Page 39: ... as shown in Figure 3 10 Figure 3 19 Alarm Control screen BATT TEST screen Select MAIN MENU 3 CONTROL 3 BATT TEST to enter the BATT TEST screen as shown in Figure 3 20 Figure 3 20 Batt Test screen Log Screen Select MAIN MENU 4 LOG to enter the LOG screen This screen has two submenus VIEW LOG and CLEAR LOG as shown in Figure 3 21 Figure 3 21 Log screens 1 AUDIBLE ALARM ON 2 AUDIBLE ALARM OFF 1 STAR...

Page 40: ...sor to the required item Press the Enter button to confirm the settings Figure 3 22 Clear Log screen ABOUT Screen Select MAIN MENU ABOUT to enter the ABOUT screen as shown in Figure 3 23 The ABOUT screen displays UPS model serial number software version and hardware version Figure 3 23 About screen DO YOU WANT TO CLEAR EVENT LOGS YES NO PN GXT4 2000RT230 SN 1XXX60XXX1AFCXX FW VER U100D100 HW VER H...

Page 41: ...IP address If the Liebert GXT4 is fitted with an optional Liebert IntelliSlot Web card Liebert IS WEBCARD the screen will display IPv6 IP address settings IPv6 requires configuration as shown in Figure 3 24 Figure 3 24 Network screens ADDRESS MAC 00 02 11 4X AX ADDRESS IPV4 10 163 226 231 24 ADDRESS IPV6 AUTO ADDRESS IPV6 STATIC ADDRESS IPV6 LINK Fe80 202 99ff fe0f 4ba 2 1 ...

Page 42: ...h the inverter UPS Internal Temperature Return To Normal The internal temperature of the UPS recovers to normal range UPS Load Return From Overload The loads are reduced and the UPS recovers to normal state from overload Load On Inverter The inverter is on and supplies protected power to the load Load On ECO Bypass The UPS is on ECO mode the mains is supplying power to the load directly to reduce ...

Page 43: ...VENT LOG screen see Figure 3 21 and select VIEW LOG to view the entire Event log Table 3 5 Fault list Fault Description UPS Self Test Failed The battery is bad or weak or not connected UPS Overload The UPS is overloaded Inverter Out Of Order The inverter has failed Battery Weak Bad The battery is bad or weak Output Short Circuit The output connection is short circuited DC Bus Overvoltage The DC bu...

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Page 45: ...l bypass then will sound one more time as the inverter powers the connected equipment 5 Check the LCD and LED indicators to ensure that the UPS is operating normally 6 Check the load percentage on the default screen to ensure that the connected equipment is not exceeding the UPS s rated capacity The UPS is now providing conditioned and protected power to the connected equipment 4 3 Manual Battery ...

Page 46: ...ll being charged The UPS may now be disconnected from AC power and the UPS will completely shut down in approximately 15 seconds 4 6 Disconnecting Input Power from the GXT4 1 After the UPS has been shut down as detailed in 4 5 Shut Down the GXT4 disconnect the input cable from the wall socket 2 Wait 30 seconds and verify that all indicators have turned Off and the fan has stopped this indicates th...

Page 47: ...The Liebert IntelliSlot UNITY card also enables monitoring external temperature humidity and contact closure inputs using external sensors Follow instructions provided with the Liebert IntelliSlot card to configure Liebert MultiLink the UPS or any additional ancillary product for the Liebert GXT4 These instructions are available at multilink liebert com 5 1 1 Liebert MultiLink Liebert MultiLink mo...

Page 48: ...t GXT4 to be changed Change and set the display language Enable Disable Auto Restart default is Enable Select frequency converter operation with a fixed output frequency of 50Hz or 60Hz bypass disabled default is Auto Select with bypass enabled Set the Low Battery Warning alarm time from 2 to 30 minutes default is 2 minutes Enable Disable the Auto Battery test default is Enable Enable Disable Auto...

Page 49: ...ote location and connected to pins1 and 2 No Description 1 Low battery warning 2 On battery warning 3 Any mode shutdown 4 Battery mode shutdown NOTE Remote Power Off will be performed either by NO or NC contact of Any Mode Shutdown depending on the settings in the configuration program A current limited source for this optocoupler 12 VDC 50 mA will be available from the UPS The connection to the U...

Page 50: ... power from the battery and has reached the Low Battery Warning time selected in the configuration program this dry contact will be closed NOTE Remote Power Off will be performed by NO contact A current limited source 12 VDC 50 mA will be available from UPS The connection to the Liebert GXT4 for remote connection will be via terminal block connector Battery Mode Shutdown wiring must conform to all...

Page 51: ... connected equipment to comply with national and local wiring codes and regulations Figure 5 2 REPO switch connection diagram CAUTION To maintain safety SELV barriers and electromagnetic compatibility signal cables should be shielded and run separately from power cables 1 2 Normally closed switch system fail safe UPS ships with REPO jumper installed allowing the UPS to operate Opening the REPO con...

Page 52: ...Communication Liebert GXT4 User Manual 44 Page intentionally left blank ...

Page 53: ... observed before replacing the battery pack Remove rings watches and other metal objects Use tools with insulated handles Do not lay tools or other metal objects on the batteries If the battery kit is damaged in any way or shows signs of leakage contact your local Emerson representative immediately Do not dispose of batteries in a fire The batteries may explode Handle transport and recycle batteri...

Page 54: ...m the UPS 2 Loosen and remove the 6 screws on the battery door as shown in Figure 6 1 3 Lay the battery door and screws aside for reassembly Figure 6 1 Removing the front bezel cover and battery door 4 Gently pull the battery wire out and disconnect the battery plug and battery receptacle as shown in Figure 6 2 Figure 6 2 Disconnecting the battery plug and battery receptacle front view CAUTION Ris...

Page 55: ... the front plastic bezel cover to the UPS 6 2 Battery Charging The batteries are valve regulated nonspillable lead acid and should be kept charged to attain their design life The Liebert GXT4 charges the batteries continuously when it is connected to the utility input power If the Liebert GXT4 will be stored for a long time Emerson recommends connecting the UPS to input power for at least 24 hours...

Page 56: ...d contact your local Emerson representative or Emerson Channel Support Check if the battery is discharging When the utility input is normal the battery should not discharge If the UPS is operating in Battery Mode stop and contact your local Emerson representative or Emerson Channel Support 6 5 Checking UPS Functions Emerson recommends checking the UPS functions once every six months Back up the lo...

Page 57: ...S shuts down through communication Contact customer service UPS overload The UPS is overloaded Reduce the load and contact customer service Inverter Out of Order The inverter is faulty Contact customer service Battery Weak Bad The battery is bad or weak Replace the battery Output Short Circuit The output connection is short circuited Shut down the equipment and contact customer service DC Bus Over...

Page 58: ...urs to recharge batteries then try to start the unit Battery indicator is illuminated UPS is not plugged in UPS is operating from battery mode Ensure UPS is securely plugged into the wall receptacle UPS input protection fuse has blown opened UPS is operating from battery mode Save data and close applications Replace UPS input fuse then restart UPS Mains power is out of tolerance UPS is operating f...

Page 59: ...on include the UPS model and serial number These are located in several places for your ease of location on the top panel rack mount orientation the left side tower orientation the rear panel on the front of the unit behind the front plastic bezel on the LCD select Main Menu About ...

Page 60: ...Troubleshooting Liebert GXT4 User Manual 52 Page intentionally left blank ...

Page 61: ...aximum Allowable VAC 280VAC Input Frequency Without Battery Operation 40 70Hz Input Power Connection PD2 CE6HDWRMBS Standard See 1 4 Removable Power Distribution Box PD2 CE10HDWRMBS Standard See 1 4 Removable Power Distribution Box Output AC Parameters AC AC Efficiency 92 AC AC Factory Default VAC 230VAC Output Connections PD2 CE6HDWRMBS Standard See 1 4 Removable Power Distribution Box PD2 CE10HD...

Page 62: ...2 Table 6 ESD IEC EN EN61000 4 2 Level 4 Criteria A Radiated Susceptibility IEC EN EN61000 4 3 Level 3 Criteria A Electrical Fast Transient IEC EN EN61000 4 4 Level 4 Criteria A Surge Immunity IEC EN EN61000 4 5 Level 3 Criteria A Transportation ISTA Procedure 1E Table 8 2 Power distribution specifications Model Number PD2 CE6HDWRMBS PD2 CE10HDWRMBS Amp Rating 32 Amps 63 Amps Input Power Connectio...

Page 63: ...Shipping Weight kg lb Unit 65 143 3 Shipping 80 176 4 E models 76 167 6 Battery Parameters Type Valve regulated non spillable lead acid Quantity x V 1 x 20 x 12V Battery Manufacturer Part 9AH CSB UPS12460F2 or CSB HR1234WF2 Backup Time See Table 8 4 Environmental Operating Temp C F 0 to 40 32 to 104 Storage Temp C F 15 to 50 5 to 122 Relative Humidity 0 95 non condensing Operating Elevation Up to ...

Page 64: ...0 33 24 17 90 29 21 14 100 24 18 12 Internal Battery 2 External Battery Cabinets 10 476 431 327 20 254 207 164 30 191 158 103 40 146 113 76 50 119 89 56 60 94 69 44 70 72 56 37 80 63 47 29 90 56 42 24 100 47 37 22 Internal Battery 3 External Battery Cabinets 10 689 627 450 20 374 299 221 30 274 226 141 40 211 165 105 50 173 130 82 60 137 105 65 70 111 88 53 80 97 73 43 90 88 64 37 100 74 58 33 Run...

Page 65: ...143 1033 695 20 626 498 345 30 455 371 217 40 345 268 164 50 281 213 129 60 224 176 106 70 184 148 87 80 163 125 74 90 148 114 60 100 125 103 55 Internal Battery 6 External Battery Cabinets 10 1367 1248 826 20 750 601 409 30 547 448 257 40 416 322 192 50 338 256 151 60 270 210 125 70 217 177 106 80 196 151 87 90 178 138 75 100 152 124 68 Table 8 4 Battery run time minutes all models continued Numb...

Page 66: ...ns are not met the run time calculation will not be modified If the configuration program is used to change the number of battery cabinets then the values in the battery above table will be restored This will override any value that is Auto Learned 8 2 Product Warranty Registration Registration is not required to activate the product warranty on a Liebert UPS Registration is required to qualify fo...

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Page 68: ...ove Di Sacco PD Italy 39 049 9719 111 Fax 39 049 5841 257 Asia 7 F Dah Sing Financial Centre 108 Gloucester Road Wanchai Hong Kong 852 2572220 Fax 852 28029250 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 ...