MGE UPS Systems GES-152L User's Manual
Contents
1. STORAGE CONDITIONS EXTENDED STORAGE BATTERY BANK INSTALLATION ssscccssssscssssscccessscccessscccccssccccssscccssscccssnsscscsssaccsessseccesssesseses 19 SPECIFICATIONS SERE SE Pe Tea UE ERO ek oe FUN ae Ue PES eg 20 22 ADDITIONAL PURCHASES OR UPGRADES ccccecececececececececececececececececececececececececececececececececececececececececeecs 22 WARRANTY QUESTIONS EEE Ear Ee S EEEN E EEEE EE ETENE aTe 22 SOFTWARE QUESTIONS eiit tete EE EE E 22 Always On UPS Systems Inc Introduction The L Series is a Line Interactive UPS system that includes the newest and latest technology enhancements The Line Interactive technology with AVR function on line voltage boost up amp buck down allows for a wide input voltage range of 90 to 150VAC The L Series UPS is the ideal protection for microprocessor controlled loads With the utility power connected the charger begins to operate immediately charging the battery In the event of a blackout or severe brownout the UPS will automatically switch to back up mode and maintain power to the load until the software shuts down the system and or when the battery reaches a low voltage state The Low Battery indicator will turn On if and when the battery needs replacement Also included with our UPS systems is a cycli2. must meet national wire requirements The power plug to connect with the UPS has to be equipped with a ground plug The batteries must be replaced or serviced by qualified knowledgeable personnel Replacement batteries must be the same type quantity and configuration as the originals To avoid explosions keep open flame and other heat emitting sources away from batteries Do not disassemble or damage the batteries The electrolyte is toxic and especially harmful to the eyes and skin The batteries contain high voltages and currents that are dangerous To maintain secure operation and performance of the UPS the user must exercise basic and regular maintenance Please follow the precautions below 1 Do not remove the UPS cover unless authorized by factory Removing the cover will void the warranty The UPS can only be connected to a 2 pole 3 wire plug Do not install the UPS in an environment with excessive humidity Do not allow liquids or foreign objects to get inside the UPS Allow for air circulation through the UPS A minimum clearance of 10 cm is required on all sides Do not load the UPS with appliances such as a hair dryer heater vacuum kettle etc Keep the UPS away from direct sunlight and heat emitting sources Install the UPS as close as possible to the load for maximum protection Storage Requirements a Recharge the UPS batteries every 6 months for no less than 8 hours at a time b Under a high ambient te
3. LINES 11 CHECK THE SITE WIRING FAULT INDICATOR cessent ense sese eren ener erinnere en 11 OPERATION wsiccsssestesssvsctoossdectessevansesestocsesvecebsesessesseseasesdeseesosbeseos 12 SWITCHING THE URS 12 SWITCHING OEF THE UPS nete hee enero de er e 12 SELCBSTES 12 SILENCE THE ALARM 12 12 BATTERY CHARGE BAR GRAPH iiec veter eee tee AE ee a Vu ERE Seed e e ea Nee AEN 13 GO BEAD 13 SHUTDOWN 13 AUDIBLE ALARM eee eo oe tvi pna ed o cua eee Sibe Kate Sveaas pe eva Va eer ELO VE Veo CiT abo Ur ewe e e vea a 13 BACK UP SLOW 2 13 LOW BATTERY RAPID Eder 13 OVERLOAD CONTINUOUS ALARM tee NEESS 13 97 13 SOFTWARE OPTIONS noe a aeos sao ase Pe Fa deoa sssuavesesssosestesbeessdedeseoats 14 UPSIDLON 2000 SOETWARE E 14 INTERFACE KITS nue reete dere EP EE EE ERE Eee Set 14 COMPUTER INTERFACE PORT e erre eleven ERENNERT 15 Open Collector Dry Contact Communication 15 RS 23 2 COMMUMICATION edet ENEE cesi e De ENEE euo ep dae 15 BATTERY REPLACEMENT TROUBLESHOOTING STORAGE
4. UPS works properly without a computer interface connection Connect External Battery Bank optional Before connecting make sure the external battery bank and the connector cable are compatible with this UPS Note External battery connection is not necessary The UPS will work properly without an external battery bank connection Caution Use only factory supplied external battery connection cables Connect to Utility Connect the AC input power connector included to utility power Charging the Battery The UPS charges its battery whenever it is connected to utility power For best results charge the battery for 4 hours initially before connecting the load Connecting the Loads Plug the loads into the output connectors on the rear of the UPS To use the UPS as a master on off switch make sure all of the loads plugged into the UPS are switched on Also available on these models is a surge protected outlet where you can plug in your laser printer plotter etc Note Never connect a laser printer or plotter to a backup outlet with other computer equipment A laser printer or plotter draws significantly more power on start up than when idle and will overload the UPS If you wish to have battery backup on a laser printer or plotter you will need to increase the size of the UPS system 10 Always On UPS Systems Inc Connecting the Telephone Modem Ethernet Lines Connect a telephone line modem line or 10BaseT line into the t
5. rubber gloves and boots Do not lay tools or metal parts on top of batteries Disconnect charging source prior to connecting or disconnecting battery terminals Determine if the batteries are inadvertently grounded If inadvertently grounded remove source of ground Contact with any part of a grounded battery can result in electric shock The likelihood of a shock will be reduced if grounds are removed during installation and maintenance applicable to a UPS and a remote battery supply not having a grounded supply circuit CAUTION To ensure the safety and performance of the UPS never load the UPS with a hair dryer heater laser printer Surge protector or other types of inductive loads Always On UPS Systems Inc TABLE OF CONTENTS INTRODUCTION Peer 5 SAFETY INSTRUCTIONS E 6 PRESENTATION prr 7 EEE EEE 7 8 INSTALLATION rrC 10 UNPACKING AND INSPECTION 10 RSS 10 CONNECT COMPUTER INTERFACE 1 1 2 242 22 0000000000 000000000000 10 CONNECT EXTERNAL BATTERY BANK OPTIONAL 404 440 000 000000000000000000005000005000 10 CONNECETO U TIEBDY 10 CHARGING THE 10 CONNECTING THE LOADS 55 n use BB ee neta teen pon anion 10 CONNECTING THE TELEPHONE MODEM ETHERNET
6. Always On UPS Systems Inc GES L Series Single Phase Input Single Phase Output Uninterruptible Power Supply USER MANUAL Version 1 4 GES 801L GES 102L GES 152L GES 202L GES 302L Line Interactive True Sine Wave 00VA 1000VA 1500VA 2000VA 3000VA Extended Run Time Battery Banks Available on All Models Always On UPS Systems Inc Always On UPS Systems Inc SAVE THESE INSTRUCTIONS This manual contains important instructions for the GES 801L GES 102L GES 152L GES 202L GES 302L and should be followed during installation and maintenance of the UPS and batteries The UPS contains voltages that are potentially hazardous Please contact our dealers or qualified personnel for service Servicing of the batteries should be performed or supervised by personnel knowledgeable with batteries and the required precautions Keep unauthorized personnel away from batteries When replacing batteries replace with the same model number type and rating CAUTION Do not dispose of the batteries in a fire The batteries may explode CAUTION Do not open or mutilate the batteries Released electrolyte is harmful to the skin and eyes It may be toxic CAUTION A battery can present a risk of electrical shock and high short circuit current The following precautions should be observed when working on or with the batteries Remove watches rings or other metal objects Use tools with insulated handles Wear
7. LETS BATTERY TYPE QUANTITY BATTERY VOLTAGE RECHARGE TIME FULL LOAD BACKUP POWER TIME HALF LOAD PENTIUM amp 17 MON EXTENDEDRUNTIME 20 Always On UPS Systems Inc YES YES SINGLE LINE 2 wire RJ 11 NETWORK UTP RJ 45 COMPATIBLE J ACKS PROTECTION COMMON amp NORMAL MODE NOISE SUPPRESSION YES RS 232 DRY CONTACT OPTIONAL SNMP OR 5400 INTERFACE NORMAL BACKUP LOVV BATTERY FAULT CHECK BATTERY BUCK BOOST ON BATTERY LOW BATTERY OVERLOAD FAULT OPERATING TEMPERATURE O 40 C Z2 104 F ENVIRONMENT HUMIDITY O 95 NON CONDENSIING AUDIBLE NOISE lt 40 CBA AT 1 METER FROM UNIT CUL UL1778 CSAC222 SAFETY APPROVAL FCC CLASS B IEEE C62 41 CAT A UPS WDH mm n 140x436x210 5 5x17 2x8 3 170x450x226 6 7x17 7x8 9 EXTERNAL BATTERY BANK if 170x450x226 PHYSICAL DATA INTERNARE BATTERIES 6 7x17 7x8 9 46 101 4 WEIGHT in kg 165 15 33 25 55 1 SCH D GES 80ILR GES 1001 R GES 152LR GES 30PLR 825433 22105 825433 22201 825433 22301 825433 22401 825433 22501 483 gt 381x133 483 381 178 19455 25 3U 19 15 7 4U WEIGHT kg 165 26 1 57 5 28 4 62 6 46 4 102 3 48338199 19x15 3 5 20 21 Always On UPS Systems Inc CONTACT INFORMATION 22 Additional Purchases or Upgrades Always UPS Sy
8. S side must be connected to the REMOTE PORT at the computer side it can be connected to either COMI or COM2 For other installation instructions and powerful features please refer to READ ME file included within the software Caution Use only factory supplied or authorized UPS monitoring kits 14 Always On UPS Systems Inc Computer Interface Port The computer interface port has the following characteristics The communication port on the back of the UPS may be connected to a host computer This port allows the computer to monitor the status of the UPS and control the operation of the UPS Its major functions include the following The ability to broadcast a warning when the power fails The ability to close any open files before the battery reserves are exhausted The ability to turn off the UPS The ability to make the UPS perform a self test Steeg Some computers are equipped with a serial connector to link with the communication port in some cases a special plug in card may be needed Open Collector Dry Contact Communication 1 Pin 5 and 2 are open collector outputs that must be pulled up to a common referenced supply no greater than 40VDC 2 The transistors are capable of a maximum non conductive load of 25mADC use pin 4 as the common 3 Pin 5 generates a High to Low signal when the battery inside the UPS has less than 5 minutes back up time left 4 Pin2 generates a High to Low signal when the line h
9. as failed 5 Pin 6 will shut down the UPS is a high is sustained for 0 36 seconds RS 232 Communication 6 Pin 6 is the RS 232 data input from computer RX 7 Pin 9 is the RS 232 data output to computer TX 8 Pin 7 18 the common or computer ground Shutdown RX Pin 3 Conunon NOTE 1 Switch rating 40V 25mADC non inductive 2 Pin 7 should be connected to computer ground only TX Pin 2 15 Always On UPS Systems Inc Battery Replacement Your batteries should run anywhere from 3 5 years before they need to be replaced Please follow the instructions below for easy trouble free battery replacement Turn the UPS off follow procedure previously mentioned Unplug the UPS from utility power source and disconnect all connected loads Disconnect AC power cord from unit Using a phillips screw driver unscrew the screws holding the top of the unit to the bottom Put screws in a safe place for reconnection 5 Carefully lift top cover off and place it to the side The connecting wires and electronics will be exposed Be careful not to touch any inner components when changing the battery 6 Remove the two 2 main connecting wires the Red and Black ones from the batteries 7 Youcan now easily remove the batteries from the unit E Caution Do not dispose of the batteries in a fire Caution Do not attempt to open the batteries Caution The following precautions should be taken when replacing the
10. batteries a Remove watches rings etc b Use tools with insulated handles 8 Place your new batteries in the same position direction and reconnect the wires The red wire to the positive pole and black wire to the negative pole 9 Please reverse steps 5 4 and 3 in that order to reassemble the unit 10 Follow the start up instructions to properly reconnect your equipment 16 Always On UPS Systems Inc Troubleshooting Please follow the guidelines below for solutions to common problems and wiring Y Check UPS input plug Y Check UPS input voltage Please prepare the information as follows for service personnel Solution Replace Fuse Switch breaker on Check AC power Call for service Call service center to replace batteries Switch breaker Check AC power Call for service Check AC power Call for service Call for service Check load situation Charge batteries and reset If that doesn t work call for service Check input power Y UPS model number and serial number Y Description of problem s in detail Possible causes Fuse Breaker at back panel open No AC input UPS fault Battery failure Breaker at back panel blown No AC input UPS AC detecting circuit fail Utility voltage or frequency abnormal UPS AC detecting circuit failure Inverter fault Over temperature Battery over voltage DC bus fault Overload fault Battery deteriorated Batteries not fully charged Bat
11. c self testing function to verify both the operation of the UPS and the condition of the battery In addition the L Series UPS provides advanced telephone line and Ethernet surge suppression through the modular connectors on the back panel The Line Interactive UPS in conjunction with our monitoring software makes your UPS operate intelligently and provides you with total protection for all your loads Note Interference to radio TV might occur in a particular installation If this UPS causes interference to radio or television reception which can be determined by turning the UPS off and on the user is encouraged to try to correct the interference by one or more of following measures 1 Connect the equipment to an outlet on a circuit different from that to which the receiver is connected 2 Increase the separation between the equipment and the receiver 3 Reorientate the receiving antenna Always On UPS Systems Inc Safety Instructions The UPS has its own internal energy source batteries therefore the output receptacles may have electricity present even though the UPS is disconnected from the utility power The DC voltage provided from the internal batteries are as follows a 5 8011 24VDC d GES 202L 48VDC b GES 102L 24VDC e GES 302L 48VDC GES 152L 36VDC Isolated Ground Wire refers to the bare wire connecting electrical equipment to ground The isolated ground wire green or green with yellow stripe
12. ditional Battery Packs refer to Switching the UPS Off section page 11 Locate the external battery connector located at the rear of the UPS Make sure you are connecting the connector correctly or problems will occur Insert the battery bank connector into the UPS The UPS is now ready to be turned on with extended runtime dest eng To install additional battery banks repeat this procedure using the battery bank connectors on the back of the battery banks Note Do not stack battery banks and make sure proper polarity 19 3KVA 21000 825433 22500 1 564 1050W 2kVA 1400VV 120VAC 220 optional 25 50 or 60 Hz auto sensing 5 120VAC 15 for 90 109VAC 15 for 130 150VAC 8 33A 125A 16 64 50Hz 60Hz Auto Detected 0 5 05 10 TRUE SINE WAVE 3 1 ON BATTERY 2 4ns Typical including detection tine 4 6 6 SEALED LEAD ACID MAINTENANCE FREE 2 3 4 24VDC 36VDC 48VDC gt Typically gt 7 gt 17 MIN gt 41 gt 7 gt 25 gt 70 MIN 2 8MIN 2 20MIN gt 41 MIN Always On UPS Systems Inc Specifications Specification Comparison GENERAL MAXIMUM CAPACITY UPC ORDER CODE NOMINAL VOLTAGE INPUT VOLTAGE RANGE FREQUENCY RANGE NOMINAL VOLTAGE AUTO VOLTAGE REGULATION CURRENT FREQUENCY OUTPUT POWER FACTOR WAVE FORM ON BATTERY LOAD CREST FACTOR TRANSFER TIME OUT
13. e UPS beeps rapidly until the UPS shuts down from battery exhaustion or returns to line normal operation Overload Continuous Alarm When the UPS is overloaded the connected load exceeds the maximum rated capacity of the UPS the UPS sounds a continuous alarm to warn of an overload condition Disconnect non essential loads until the UPS stop the alarm this will eliminate the overload Replace Battery Continuous Alarm The UPS emits continuous beeps and the REPLACE BATTERY LED illuminates if the battery fails the self test See replace battery section for battery replacement or call your dealer for service 13 Always On UPS Systems Inc Software Options UPSilon 2000 Software The UPSilon 2000 software utilizes standard RS 232 interface to perform monitoring functions and provides an orderly shutdown of a computer system in the event of power failure Moreover UPSilon 2000 displays all the diagnostic symptoms through a graphical interface such as Voltage Frequency Battery Level etc The software is available for DOS Windows 3 x Windows 95 98 00 amp Windows NT V3 5 or later FreeBSD Linex Novell and more Interface Kits A series of interface kits are available for various operating systems that provide UPS monitoring Each interface kit includes the special interface cable required to convert status signals from the UPS into signals that the individual operating system will recognize The interface cable at the UP
14. e port Switching Off the UPS Press and hold the OFF button until the LINE NORMAL or BACK UP LED turns off To full turn off UPS also unplug the utility cord from the UPS Self test The self test verifies that both the operation of the UPS and the condition of the batteries are normal Under normal operating power push and hold the ON TEST button for more than 1 second and the UPS will perform a self test function During the self test the UPS will operate in back up mode Note During the self test the UPS briefly operates the load s on battery power the Back Up LED turns on If the UPS passes the self test it returns to on line operation the Back Up LED turns off and the Line Normal LED turns on steady If the UPS fails the self test it immediately returns to normal operation and the Replace Battery LED turns on The loads are unaffected by the self test Recharge the battery overnight and perform the self test again If the Replace Battery LED is still on ask our nearest dealer about replacing the batteries Silence The Alarm In Back Up mode push and hold the ON TEST button for more than 1 second to silence the audible alarm This function is unavailable under LOW BATTERY or Overload conditions Note In Back Up mode the UPS can be automatically turned off if none of the connected loads are operating Load Bar Graph This 5 LED display shows the power required by the load as a percentage of the UPS s rated ca
15. elephone modem Ethernet surge protection sockets on the back of the UPS The RJ 45 RJ 11 modular sockets accept standard single line telephone connections and 10BaseT connectors This connection will require another length cable Note This connection is optional It is not necessary to use this with the UPS Caution The line current limiting feature could be rendered inoperable if improperly installed Make sure that the line from the wall is plugged into the connector marked IN and the device to be protected telephone modem etc is plugged into the connector marked Caution This surge protection device is for indoor use only never install wiring during a lightning storm Check the Site Wiring Fault Indicator After plugging in the load s and the UPS check the site wiring fault indicator on the rear panel It lights up if the UPS is plugged into an improperly wired AC power outlet Wiring faults detected include ground hot neutral polarity reversal and overloaded neutral circuit ot D x x 11 Always On UPS Systems Inc Operation Switching On the UPS With the UPS plugged in press and hold the ON TEST button for at least 1 second to switch the UPS on The UPS will perform a self test each time it is switched on Note When switched off and still plugged into utility the UPS maintains the battery charge and will respond to commands received through the computer interfac
16. mperature environment recharge the UPS batteries every 3 months for no less than 8 hours at a time 10 High Voltage Risk a High voltages might exist between the battery terminal and the grounding system if the battery circuit has not been disconnected from the UPS circuit Please check this voltage before connecting Disconnect the battery wires before proceeding with maintenance High voltages may be present between the UPS internal components and batteries even after the input power is disconnected Always On UPS Systems Inc Presentation Front Panel 1 POWER bar graph BATTERY CHARGE LINE VOLTAGE This displays the present battery charge as a percentage of battery capacity It also displays the utility line voltage 2 LOAD bar graph This displays the amount of power required by the load as a percentage 3 OVERLOAD indicator RED LED This LED lights when the load s connected to the UPS exceed the UPS s capacity See Section 6 3 for solution to this problem 4 AVR Automatic Voltage Regulation indicator YELLOW LED This LED illuminates when the UPS is correcting for a high utility voltage condition The load s receive normal 120VAC power 5 ON TEST button With the UPS plugged in press the ON TEST button to turn on the UPS and power the loads ON TEST also activates the UPS s self test and utility line voltage displays 6 LINE NORMAL indicator GREEN LED This LED illuminates when
17. pacity For example If three LEDs are lit the load is drawing between 50 and 67 of the total capacity If the UPS is overloaded the overload LED lights and an alarm sounds 12 Always On UPS Systems Inc Battery Charge Bar Graph This 5 LED display indicates the present charge of the UPS s batteries as a percentage of the total battery capacity When all five LED s are lit the batteries are fully charged When only two of the LED s are lit the batteries can supply less than two minutes of power to the load Cold Start When the UPS is off and there is no utility power use the cold start feature to apply power to the loads from the UPS s battery Press and hold the ON TEST button until the UPS beeps Shutdown Mode In shutdown mode the UPS stops supplying power to the load and waits for the return of utility power If there is no utility power present external devices e g servers connected to the computer interface port can command the UPS to shutdown This is normally done to preserve battery capacity The UPS will scroll the front panel indicators sequentially in shutdown mode Audible Alarm Back Up Slow Alarm When in back up mode the Yellow LED illuminates and the UPS sounds an audible alarm The alarm stops when the UPS returns to line normal operation Press the On Off Test Silence Button during back up mode to silence the beeping Low Battery Rapid Alarm In back up mode when the battery energy runs low th
18. ption Caution Use only factory supplied or authorized SNMP monitoring kit 14 OUTPUT POWER RECEPTACLES Connect load s here 15 AC INPUT POWER RECEPTACLE Plug into properly rated outlet Always On UPS Systems Inc 16 INPUT CIRCUIT BREAKER It trips when the connected loads exceed the protected receptacle s capacity The center plungers of the circuit breakers extend when tripped 17 SITE WIRING FAULT INDICATORS RED LED It illuminates when the UPS is connected to an improperly wired AC power outlet Note This device is available on 120 VAC model only 18 COMPUTER INTERFACE Provides both RS 232 and relay signal to support NOVELL UNIX DOS WINDOWS and other operating systems Always On UPS Systems Inc Installation Unpacking and Inspection Examine the packaging for damage Inform the carrier immediately if and or when damage is noticed Retain the packaging for future use Placement Install the UPS in a protected area with adequate airflow and free of excessive dust Do not operate the UPS where the temperature and humidity is outside the specified limits Connect Computer Interface optional UPSilon 2000 or selected option and an interface kit can be used with this UPS Use only kits supplied or approved by the manufacturer If used connect the interface cable to the 9 pin computer interface port on the back panel of the UPS See Back Panel Note Computer interface connection is optional The
19. stems Inc Bldg 1 150 Campion Road Kelowna BC Canada V1X 7S8 Phone 250 491 9777 Ext 451 Fax 250 491 9775 Email sales alwaysonups com Website www alwaysonups com QA Warranty Questions Always UPS Systems Inc Bldg 1 150 Campion Road Kelowna BC Canada V1X 7S8 Phone 250 491 9777 Ext 209 Fax 250 491 9775 Email ga alwaysonups com Website www alwaysonups com Software Questions Always UPS Systems Inc Bldg 1 150 Campion Road Kelowna BC Canada V1X 7S8 Phone 250 491 9777 Ext 204 Fax 250 491 9775 Email webmaster alwaysonups com Website www alwaysonups com
20. tery charger damaged Abnormal utility power 17 General Problems Problems UPS has no reaction while AC power is connected UPS no reaction while AC power is connected yet starts after pushing power on off switch UPS goes into back up mode while connected to AC power Fault LED lit Battery can not provide normal back up power in the event of a blackout After AC connected to UPS alarm sounds short and fast beeps and UPS shuts down Always On UPS Systems Inc Storage Storage Conditions Store the UPS covered and upright in a cool dry location with its battery fully charged Before storing charge the UPS for at least eight 8 hours Remove any accessories from the accessory slot and disconnect any cables connected to the computer interface port to avoid unnecessary drain on the battery Extended Storage During extended storage periods in environments where the ambient temperature is 15 to 30 C 5 to 86 F charge the UPS s battery every 6 months During extended storage in environments where the ambient temperature is 30 to 45 C 86 to 113 F charge the UPS s battery every 3 months 18 Always On UPS Systems Inc Battery Bank Installation Install up to 8 battery banks per L Series UPS following the instructions below 1 2 3 4 BLACK Sed Caution Make sure the UPS is shutdown and unplugged before connecting ad
21. the line input voltage is normal 7 OFF button Press the OFF button to turn off the UPS and the load s 8 BACK UP indicator GREEN LED This LED illuminates when the UPS is supplying battery power to the loads 9 BOOST AVR VOLTAGE BOOST indicator YELLOW LED The LED illuminates when the UPS is correcting for a low utility voltage condition The load s receive normal power 10 REPLACE BATTERY indicator RED LED This LED illuminates when the UPS s batteries are no longer useful and must be replaced Note When ed dated the batteries disconnect the utility power then open the case Take notice of the polarity before installing the new batteries to avoid a short Always On UPS Systems Inc Rear Panel 11 TELEPHONE MODEM ETHERNET SURGE PROTECTION Surge protection for telephone line modem line and 10BaseT line to maintain a completely safe connection for INTERNET INTRANET service 12 EXTERNAL BATTERY PACK CONNECTOR optional Allows for extended runtime Caution Use only factory supplied or authorized connecting cable for external battery pack 13 SNMP INTERFACE PORT optional This option will allow the UPS to be connected directly to a network and also allow for remote monitoring Through the RS 232 communication port the SNMP adapter makes your UPS become SNMP manageable and provides real time UPS and power status information for the network manager Note It s not necessary to use this o
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