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1. Parallelable UPS System Marketing Management Team of Europe 2 2 EQUIPMENT 2 2 1 UPS System The UPS system shall consist of an appropriate number of single module units to meet capacity and redundancy requirements Each UPS module shall consist of a rectifier battery converter three phase inverter static transfer output switch mains bypass static switch protective devices and accessories as specified Each UPS module shall also include a battery disconnect and battery system 2 2 2 Configurations The UPS system shall consist of either a single module unit or two or more up to a maximum of six units of the same kVA rating Systems greater than one module shall operate simultaneously in a parallel configuration with the load shared equally between the connected modules With the exception of a single module configuration the system shall be redundant or non redundant as stated elsewhere in this specification A Non redundant system all the modules making up the UPS system shall supply the full rated load If a module should malfunction the load has to be transferred automatically and uninterrupted to the bypass line by the use of the static mains bypass switch B Redundant system the UPS system shall have one or more module s than required to supply the full rated load The malfunction of one of the modules shall cause that module to be disconnected from the critical load and the remaining module s shall continue to carry2. RMS should be less than 1 and ripple current must not exceed 5 of C 10 Ah rating nominal discharging current Number of battery is 40 blocks nominal voltage is 12V per block Discharging The battery converter will supply power to the inverter when the rectifier is shut down or in joint mode and also the rectifier is current limiting 2 3 3 Inverter The term inverter shall denote the equipment and controls to convert DC from the rectifier or battery converter to provide AC power to the load The inverter shall be solid state capable of providing the rated output power The inverter shall be of Vector Controlled design and utilize insulated gate bipolar transistors IGBTs switching at high frequency in order to minimise output voltage distortion A Overload Capability e 150 of UPS rated output with a resistive load for one minute e 125 of UPS rated output with a resistive load for ten minutes The UPS will achieve the overload mentioned above below 40 C operating temperature nominal input voltage and when the battery is in a full charged condition e 110 of UPS rated output with a resistive load for one hour The UPS will achieve the overload mentioned above with 400 415V nominal input and output voltage and when the battery is fully charged e At 415V Input amp Output this UPS will deliver 4 5 more power subject to certain conditions Output Frequency The inverter shall track the bypass mains supply contin
3. e UPS output frequency e Local load e Load of each phase of total load e Active power apparent and reactive power of each phase output e Load crest factor e Battery e Battery bus voltage e Battery current e Forecasted Battery backup time remaining time e Battery temperature in degree centigrade e System load e Apparent power of each output phase for parallel operation system ENP UPS IE Guide Specifications Liebert NXe Marketing Team 23 Sept 2005 Version 1 0 10 20kVA Parallelable UPS System Marketing Management Team of Europe e Active power of each output phase for parallel operation system e Inactive power Reactive power of each output phase for parallel operation system C Power Flow Mimic Each UPS module shall be equipped with a mimic to indicate power flow to the critical load along with an indication of the availability of the rectifier charger battery automatic bypass inverter load The mimic shall provide a quick and easy indication of the load level displayed on LCD including for overload conditions displayed on LCD This power flow is also shown in the LCD menu D Alarms and Status Information Alarm and status conditions shall be reported at a single module UPS system or at a paralleled module UPS or both The display and control panel shall report the alarms and status information listed below Each alarm shall be visually displayed in text form and an audible alarm will sound for each ala
4. transferred to the bypass line ENP UPS TEs Guide Specifications Liebert NXe Marketing Team 23 Sept 2005 Version 1 0 10 20kVA Parallelable UPS System Marketing Management Team of Europe uninterrupted should the connected critical load exceed the capacity of the available on line modules The status of protective devices shall be indicated on a graphic display screen on the front of the unit 2 3 STANDARD COMPONENTS 2 3 1 Rectifier The term rectifier shall denote the solid state equipment and controls necessary to convert AC to regulated DC for input to the inverter The rectifier shall be of DSP Digital Signal Processor controlled design and utilize insulated gate bipolar transistors IGBTs A Input Current Total Harmonic Distortion Less than 3 at full rated UPS output load and 100 balance non linear load with input voltage THD lt 2 B Power factor correction The rectifier also performs a PFC function input power factor shall be a minimum 0 99 C AC Input Current Limiting K derated with 45 low input voltage Input os etn 10kVA 15kVA 20kVA 380V 69 69 69 400V 72 72 72 415V 75 75 75 Output power K derated Rating power ONLY FOR LINEAR AND NON LINEAR LOAD The maximum Input current limit can be reduced at 100 for generator operation D Input Power Walk in The rectifier charger shall provide a feature that limits the total initial power requirements the power
5. 0 4 2 4 5 6 8 11 EN60950 EN60529 e IEC 60146 1 1 The UPS is CE marked in accordance with EEC directives 73 23 low voltage and 89 336 electromagnetic compatibility The Quality System for the engineering and manufacturing facility certificated to conform to Quality System Standard ISO 9001 for the design and manufacture of power protection systems for computers and other sensitive electronics ENP UPS Ee a Guide Specifications Liebert NXe Marketing Team 23 Sept 2005 Version 1 0 10 20kVA Parallelable UPS System Marketing Management Team of Europe 1 3 SYSTEM DESCRIPTION 1 3 1 Design Requirements A For non redundant operation applicable not applicable the UPS system shall be sized to provide a minimum of kVA and a minimum of kW output B For redundant operation applicable not applicable the UPS system shall be sized to provide a minimum of kVA and a minimum of kW output with ___ module s out of service Load voltage and bypass line voltage will be _ VAC three phase and neutral Input voltage will be____VAC three phase The battery system shall have a capacity of___kW for at least____ minutes at 25 C The battery will be installed Inside UPS On open racks On cladded racks In battery cabinets 1 3 2 Modes of Operation The UPS shall be designed to operate as an on line double conversion reverse transfer system in the following modes A Normal UPS inverters continuously powers the c
6. 3 Sept 2005 Version 1 0 10 20kVA Parallelable UPS System Marketing Management Team of Europe 1 4 ENVIRONMENTAL CONDITIONS 1 4 1 Operating Ambient Temperature UPS 0 C to 40 C without de rating Battery 25 C 5 C for optimum battery performance 1 4 2 Storage Transport Ambient Temperature UPS 20 C to 70 C Battery 20 C to 30 C 20 C for optimum battery storage 1 4 3 Relative Humidity 0 to 95 non condensing 1 4 4 Altitude 1EC62040 3 Operating To 1000 m above sea level without de rating Storage Up to 1000m above sea level for continuous storage Up to 15000 m above sea level for air transportation for a flight duration not exceeding 16h 1 4 5 Immunity A Conduction IEC 62040 2 class A B Radiation IEC 62040 2 class A C Harmonic IEC 61000 3 4 D Immunity EN 61000 4 2 3 4 6 8 9 11 Level Ill EN 61000 4 5 Level IV ENP UPS Nos Guide Specifications Liebert NXe Marketing Team 23 Sept 2005 Version 1 0 10 20kVA Parallelable UPS System Marketing Management Team of Europe 1 5 UPS DELIVERY SUBMITTALS The specified UPS shall be supplied with one 1 user manual to include details of A Functional description of the equipment with block diagrams B Detailed installation drawings including all terminal locations for power and control connections for both the UPS and battery system C Safety precautions D Step by step operating procedures E General maintenance guidelin
7. 8 MIB definitions UPS information will also be available over the network via a web browser via an HTTP page The card supports static as well as DHCP and BootP boot modes of operation for plug and play network installations The card is also configurable via the network using the HTTP web page Telnet session or serial interface Configuration properties include device naming and specific service enable disable and control enable disable The card provides configuration and control security through a user name and password The cards firmware can also be update such that future releases can be downloaded to enjoy card enhancements B RS 485 Interface Card The UPS shall have an optional internally fitted RS 485 interface card that will provide real time status information over a 2 or 4 wire RS 485 connection The RS 485 Interface Card will support ModBus RTU and JBus C Relay Card The UPS shall have an optional internally fitted Relay card that will provide real time status information of the following UPS conditions UPS ON UPS FAILURE UPS ON BATTERY UPS ON BYPASS BATTERY LOW via a contact closure interface relay contacts rated at 24VDC 1A The card will allow interfacing with AS400 iSeries systems or remote monitoring devices such as a Remote Monitor Panel 2 4 2 Battery Cabinet Batteries shall be housed in a suitable cabinet matching in appearance height and depth of the UPS modules 2 4 3 External battery tempe
8. Marketing Management Team of Europe Emerson Network Power Liebert NXe UPS GUIDE SPECIFICATIONS For a 10 to 20 kVA 50 or 60Hz Parallelable Digital Uninterruptible Power Supply UPS System O Liebert NX ENP UPS 2 ls Guide Specifications Liebert NXe Marketing Team 23 Sept 2005 Version 1 0 10 20kVA Parallelable UPS System Marketing Management Team of Europe Contents ASACSOMMARY sashes 2s sie E 3 Ta STANDARD oscars abad 3 123 SYSTEM DESGRIPTION court 4 1 3 A Design Requirements cti ahar 4 1 3 2 Modes OF Operation it 4 1 3 3 Performance Requirements naersin ete daa e dale aa ADU RAGAN ava ate 6 13 32 OPS Module AC A E a E a a a r EE e Aea TAEKE REAPER RE lic 6 13 3 2 UPS Module AC OUUU eee eere r in EEE EEEE EEEE EEEE ENNE EEEE ENESE 6 1 3 3 3 Bypass tati Within E 7 13 34 Earth AA aan 7 1 4 ENVIRONMENTAL CONDITIONS ooonococccncononcnnonnnnnnonnnnnncnnnnnn cnn nnnnn cnn nano rra rn n rra rra n rr rr rnnn rre 8 1 4 1 Operating Ambient Temperature ocooonocnnocoonononononcnnnnononannnanconannon conan nero nonn E enn nn a E aeS 8 1 4 2 Storage Transport Ambient Temperature coooonconcconnnonconnnncononnnoncnnononononononnon conc cn nonn conc no cnc rn cnn non ncnnnss 8 14 3 Relative Hom orton id 8 TAA Altitude aid od E Aoi o tad 8 1 45 Immunity ir A S S 8 1 5 UPS DELIVERY SUBMIT TALS 0d coca 9 16 WARRANT Y ccoo di a a a a ha ot edad 9 1 6 gt UPS Wat ad coo isis 9 1 6 2 Battery A NN 9 TAQUALITYASSURANCE cuc
9. Slave passive redundancy also known as Hot Stand By The master unit connects to critical load and slave unit connects to the bypass of master unit ENP UPS 250s Guide Specifications Liebert NXe Marketing Team 23 Sept 2005 Version 1 0 10 20kVA Parallelable UPS System Marketing Management Team of Europe 1 3 3 Performance Requirements The UPS is VFI classified according to IEC 62040 3 producing an output waveform that is independent of both the input supply frequency and voltage 1 3 3 1 UPS Module AC Input A B C Voltage Range 305 to 477V Frequency Range 40 70Hz Power Walk In maximum 30 seconds to full rated input current Field selectable from 5 to 30 seconds adjustable with 5 second increments D Power Factor Minimum 0 99 without any option at full rated UPS output load E Generator Adaptability UPS input current limit can be adjusted to suit the generator power rating Wide input frequency range is permissible Current Distortion Less than 3 at full rated UPS output load and 100 balanced non linear load with input voltage THD lt 2 1 3 3 2 UPS Module AC Output Three phase 4 wire plus ground Load Rating 100 continuous load rating at 40 C for any combination of linear and non linear loads Voltage Stability 1 steady state for balanced loads 2 for 100 unbalanced loads Bypass Line Sync Range Field selectable 0 5 to 3 0 Hz at 1 0 Hz increments Default shall be 3 0 Hz Frequ
10. ad Capability at Rated Output Voltage e 150 of UPS rated output with a resistive load for one minute e 125 of UPS rated output with a resistive load for ten minutes The UPS will achieve the overload mentioned above below 40 C operating temperature nominal input voltage and when the battery is in a full charged condition e 110 of UPS rated output with a resistive load for one hour The UPS will achieve the overload mentioned above with 400 415V nominal input and output voltage and when the battery is fully charged e At 415V Input amp Output this UPS will deliver 4 5 more power subject to certain conditions Module Current Limit lpeak is equal to 3 4xIn for up to 200ms 1 3 3 3 Bypass Static Switch A Voltage Range Upper limit 10 15 or 20 default shall be 15 Lower limit 10 20 30 or 40 default shall be 20 Frequency Range 10 20 Field Selectable Overload Capability specified without fuses Below 135 rated output current long term operation no time limitation From 135 to 170 rated output current 10 minutes Up to 1000 full UPS rated output current 100 milliseconds Neutral Conductor Sizing 1 7 times rated current 1 3 3 4 Earthing The AC output neutral shall be electrically isolated from the UPS chassis The UPS chassis shall have an equipment earth terminal Provisions for local bonding are to be provided ENP UPS e Guide Specifications Liebert NXe Marketing Team 2
11. by means of an internal ENP UPS aye Guide Specifications Liebert NXe Marketing Team 23 Sept 2005 Version 1 0 10 20kVA Parallelable UPS System Marketing Management Team of Europe disconnect The UPS shall continue to function and meet all of the specified steady state performance criteria except for the power outage back up time capability E Frequency Converter The UPS may also be programmed into frequency converter mode for either 50Hz or 60 Hz stable output frequency The input frequency may vary from 40Hz to 70Hz In this mode the static bypass operation is diabled and the battery becomes optional depending on any requirement to operate in battery mode stored energy mode F Bypass If the inverter fails or the inverter overload capacity is exceeded or the inverter is manually turned off by user and at this time the inverter is synchronous with the bypass the static transfer switch shall perform a transfer of the load from the inverter to the bypass source with no interruption in power to the critical AC load If the inverter is asynchronous with the bypass the static switch will perform a transfer of the load from the inverter to the bypass with interruption in power to critical AC load This interruption may be programmed to lengths of 40 60 80 and 100msecs G ECO In economic operation mode the bypass is the preferred source to the inverter when the bypass fails the critical AC load will transfer to the inverter In th
12. cordance with the requirements of IEC All electrical power connections shall be torqued to the required value and marked with a visual indicator English tag Provision shall be made in the cabinets to permit installation of input output and external control cabling Provision shall be made for bottom access allowing for adequate cable bend radius to the input and output connections 2 1 3 Construction The UPS shall be housed in an IP20 enclosure designed for floor mounting The UPS shall be structurally adequate and have provisions for forklift handling Maximum cabinet height shall be 1 4 metres 2 1 4 Cooling Adequate ventilation shall be provided to ensure that all components are operated well within temperature ratings Provision shall be there within the UPS cabinet to house 100 redundant fans Temperature sensors shall be provided to monitor UPS internal temperature Upon detection of temperatures in excess of manufacturer s recommendations the sensors shall cause audible and visual alarms to be sounded at the UPS control panel A separate battery room ambient temperature sensor shall be provided to allow control of the battery charging voltage with change of temperature The air should flow into the cabinet from the front and ventilate from the rear 800mm is required at the rear of the UPS for the purpose of ventilation ENP UPS 10 Guide Specifications Liebert NXe Marketing Team 23 Sept 2005 Version 1 0 10 20kVA
13. ency Stability Frequency regulation whilst free running on battery shall be 0 05 Hz If the bypass is available and within limits even if the UPS is on battery operation in this case the output will sync to the bypass Nominal frequency shall be 0 05 in single module mode and 0 25 in parallel mode Frequency Slew Rate For single mode the slew rate shall be adjustable from 0 1Hz s to 3Hz s default setting shall be 0 1 Hz s For parallel mode the slew rate shall be fixed to a suitable value default setting shall be 1 0 Hz s Efficiency It is defined as output kW input kW at a load power factor of 0 8 lagging e Up to 91 at full rated load nominal input no battery e Not less than 94 at full rated load when supplying the load through the static bypass G Phase Unbalance 120 1 el for 100 balanced or unbalanced loads H Voltage Transients 5 for 100 output load step up or step down ENP UPS 26 Guide Specifications Liebert NXe Marketing Team 23 Sept 2005 Version 1 0 10 20kVA Parallelable UPS System Marketing Management Team of Europe Transient Recovery Time Return to within 5 of steady state output voltage within half a cycle Voltage Distortion at 100 rated load with crest factor 3 1 e Less than 1 total harmonic distortion THD for linear loads e 4 THD for 100 balanced non linear loads 3 1 crest factor e 5 THD for 100 unbalanced non linear loads 3 1 crest factor Module Overlo
14. ent centralized monitoring and event management of UPS Environmental and Power systems that can utilize an existing network infrastructure 2 3 9 DBS Dual Bus Synchroniser The objective of the Dual bus Synchronizer DBS is to keep the output of two independent UPS systems either two independent single units OR two independent parallel systems each composed of up to six modules in both topologies with and without Main Static Switch in synchronization even when the two systems are operating on different modes bypass inverter or on batteries It is usually used with Static Transfer Switches to achieve Dual Bus Power Supply configuration DBS is able to synchronize systems with TWO completely different sources of incoming power to UPS systems homogeneously composed of e Liebert NXe UPS s only ENP UPS 7 Guide Specifications Liebert NXe Marketing Team 23 Sept 2005 Version 1 0 10 20kVA Parallelable UPS System Marketing Management Team of Europe 2 4 OPTIONS 2 4 1 Optional Communications A SNMP HTTP Network Interface Card The UPS shall have an optional internally fitted network interface card that will provide real time status information over an 10 100 base T Ethernet to for users The network interface card will support SNMP v1 v2c and be MIB II compatible for integration into an ENP monitoring solution or a Network Management System The card supports SNMP traps for up to 20 destinations and supports LGP and RFC162
15. es The UPS shall be supplied with a record of pre shipment final factory test report 1 6 WARRANTY 1 6 1 UPS Warranty The UPS manufacturer shall warrant the unit against defects in workmanship and materials for 12 months after initial start up date or 15 months after ship date whichever comes first 1 6 2 Battery Warranty The battery manufacturer s standard warranty shall be passed through to the end user 1 7 QUALITY ASSURANCE 1 7 1 Manufacturer Qualifications A minimum of twenty years experience in the design manufacture and testing of solid state UPS systems is required The manufacturer shall be certified to ISO 9001 1 7 2 Factory Testing Before shipment the system shall be fully and completely tested to ensure compliance with the specification ENP UPS 9 Guide Specifications Liebert NXe Marketing Team 23 Sept 2005 Version 1 0 10 20kVA Parallelable UPS System Marketing Management Team of Europe PRODUCT 2 1 FABRICATION 2 1 1 Materials All materials of the UPS shall be new of current manufacture high grade and shall not have been in prior service except as required during factory testing All active electronic devices shall be solid state Control logic and fuses shall be physically isolated from power train components to ensure operator safety and protection from heat All electronic components shall be accessible from the front 2 1 2 Wiring Wiring practices materials and coding shall be in ac
16. igital Uninterruptible Power System UPS consisting of one or more single module UPS units connected in parallel without the need for either an additional system controller or a centralised mains bypass static switch The UPS shall automatically maintain AC power within specified tolerances to the critical load without interruption for specified duration as per battery run time during failure or deterioration of the mains power supply The UPS shall be expandable by paralleling additional modules of the same rating to provide for module redundancy or load growth requirements The manufacturer shall design and furnish all materials and equipment to be fully compatible with electrical environmental and space conditions at the site It shall include all equipment to properly interface the AC power source to the intended load and be designed for unattended operation 1 2 STANDARDS The UPS and all associated equipment and components shall be manufactured in accordance with the following applicable standards e Safety Requirements IEC 62040 1 1 EN 50091 1 1 e EMC IEC 62040 2 Class A EN 50091 2 Class A Performance IEC 62040 3 VFI SS 111 EN50091 3 The above mentioned product standards incorporate relevant compliance clauses with generic IEC and EN standards for safety 60950 electromagnetic emission and immunity 61000 series and construction 60146 series and 60529 For more details see below e IEC 61000 3 4 IEC 6100
17. is mode higher efficiency will be obtained This mode is user selectable In Eco mode loads are fed through the bypass static switch while the bypass AC supply voltage is within an acceptable voltage window the frequency synchronization range shall be selected from 0 5Hz 1Hz 2Hz and 3Hz of the rated output frequency the default value shall be 2Hz the phase angle shall be below 3 the amplitude range shall be fixed at 10 of the nominal bypass voltage Failure of the bypass AC supply to remain within this voltage window results in transfer of the load to the UPS inverter The rectifier and battery converter in both cases float charges the battery system while its input AC supply is present H Maintenance Each UPS has an internal maintenance bypass external maintenance bypass is an external maintenance bypass which is installed in the Maintenance Bypass Cabinet If the UPS needs to be maintained or repaired after the inverter is turned off and the load is transferred to bypass the internal maintenance bypass or external maintenance bypass can be turned on and the UPS can be shut down and the battery can be disconnected for maintenance purposes I Parallel For higher capacity or higher reliability the UPS outputs 3ph 4w can be directly paralleled together parallel controllers in every UPS automatically share the load The largest parallel capacity is up to six times the nominal load of each unit composing the system J Master
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19. of the rectifier will increase gradually the power walk in time can be set from 5 seconds to 30 seconds default shall be 10 seconds E Mains AC Input phase sequence reverse protection Before soft starting of the rectifier if the phase sequence of the main AC input is reversed the rectifier will not start and an alarm is displayed on the LCD F Input Over Current Protection A circuit breaker is used in the UPS system so that loss of any semiconductor shall not cause cascading failures G Battery Start The UPS shall be able to start up and run on battery without any incoming mains available The above functionality shall be achieved also when more UPSs up to six units are connected in parallel either for redundancy or for capacity ENP UPS 12 Guide Specifications Liebert NXe Marketing Team 23 Sept 2005 Version 1 0 10 20kVA Parallelable UPS System Marketing Management Team of Europe 2 3 2 Battery converter Batteries can be VRLA Maintenance Free Ni Cd or Wet Cell type Constant current boost charging constant voltage boost charging float charging float charging compensation and EOD protection are available for the different types of battery Charging In addition to supplying power to the load the battery converter shall be capable of producing a battery charging current sufficient to replace 95 of the battery discharge power within ten 10 times the discharge time Ripple voltage at the battery terminal
20. on L x H 160x109 mm This shall ENP UPS 14 Guide Specifications Liebert NXe Marketing Team 23 Sept 2005 Version 1 0 10 20kVA Parallelable UPS System Marketing Management Team of Europe automatically provide all information relating to the current status of the UPS as well as being capable of displaying metered values The display shall be menu driven permitting the user to easily navigate through operator screens B Metered Values An MCU or DSP shall control the display functions of the monitoring system All three phase parameters shall be displayed simultaneously All voltage and current parameters shall be monitored using true RMS measurements for accurate 1 representation of non sinusoidal waveforms typical of computers and other sensitive loads The following parameters shall be displayed e Main input e Three phase main input line to neutral voltage e Three phase main input line to line voltage e Transformer input line to neutral and line line voltage e Three phase main input current e Main input frequency e Three phase input power factor e Bypass e Each phase bypass input line to neutral voltage Bypass input line to line voltage e Transformer input line neutral and line line voltage Bypass input frequency UPS output Each phase output voltage of UPS e Each phase output current of UPS e Output line to line voltage of UPS e Transformer output line neutral and line line voltage e Power factor of each phase
21. r load Timeout Operation Invalid Output Fuse Fail Control Power 2 Fail Unit Over load UPS Shutdown Output Disabled Transfer Confirm Transfer cancel Unit Off Confirm System Off Confirm Fault Reset Alarm Silence Output Disconnect Open Output Disconnect Closed Turn On Fail Output Over Voltage Reserved Alarm Reset Load Impact Transfer Transfer Time out Load Sharing Fault Parallel ID Error ERO Setting Save Error ENP UPS Liebert NXe Marketing Team 10 20kVA Parallelable UPS System 16 Guide Specifications 23 Sept 2005 Version 1 0 Marketing Management Team of Europe E Inverter ON OFF Each UPS module shall be equipped with an inverter ON OFF switch which will transfer the load from all UPS modules to the bypass mains supply if it is available The inverter ON OFF control shall be protected under menu confirm protect if the bypass mains is not available 2 3 Communication Ports The UPS shall have three Intellislots available to fit and work with 3 option cards simultaneously See Section 2 4 for a description of the required optional equipment 2 3 8 Software Compatibility The UPS shall have optional software available for monitoring control and event management The available solutions shall provide e users with basic UPS operating status plus automated shutdown of a computers Operating System in the event of an extended power outage e cost effici
22. rature sensor To ensure temperature compensated charging to protect battery life a battery temperature monitoring probe is necessary to monitor the battery enclosure temperature rise caused by the AC mains power loss and of the battery s internal resistance when operating The probe system includes one battery temperature sensor and one temperature transport ENP UPS 18 Guide Specifications Liebert NXe Marketing Team 23 Sept 2005 Version 1 0 10 20kVA Parallelable UPS System
23. ritical AC load The rectifier chargers derives power from the mains AC power supply source converting this to DC power to supply the inverters while simultaneously float boost charging the battery system Power supplied by the UPS inverters is to within specified tolerances at rated voltage and frequency B Battery Upon failure of the mains AC power supply source the critical AC load is powered by the inverter which gets without interruption power from the battery system There shall be no interruption in power to the critical load upon failure or restoration of the mains AC power supply source Upon restoration of the mains AC power supply source power to the rectifier initially is restricted by a gradual power walk in Following the short power walk in period the rectifier powers the inverter and simultaneously recharges the battery through the battery converter This shall be an automatic function and shall cause no interruption to the critical load C Source shared mode A part of the critical AC load is supplied by the mains AC input and the remainder of the critical AC load is supplied by battery The ratio of the mains AC input power is user selectable from 20 to 80 of full rated output active power This mode is mostly used in generator mode when a smaller generator than needed is employed D Off Battery When the battery system is taken out of service for maintenance it is disconnected from the battery converter and inverter
24. rm displayed see the following table Charger fault Input Fuse Fail Control Power 1 Fail Mains Phase Reversed Mains Voltage Abnormal Mains Under voltage Mains Frequency Abnormal Generator Connected Input Disconnect Open Input Disconnect Closed Input Inductor Over temperature Rectifier Fault Rectifier Over current Soft Start Fail Rectifier Comm Fail Rectifier in setting Rectifier Over temperature DC Bus Abnormal DC Bus Over voltage Balancer Fault Balancer Over current Balancer Over temperature Inverter Over current Inverter Asynchronous Inverter Fault Inv Inductor Over temperature Battery Over temperature Battery Fault Battery Replaced Battery Low Pre warning Battery End of Discharge Battery Contactor Fail Battery Converter Fault Battery Converter Over current Battery Converter Over temp Battery Capacity Testing Battery Maintenance Testing Battery Fuse Fail Battery Contactor Open Battery Contactor Closed Battery Reverse No Battery Battery Float Charging Battery Boost Charging Battery Discharging Battery Period Testing Auto start BCB closed BCB open Battery ground fault Bypass Unable to Trace Bypass Abnormal Maintenance Disconnect Open Maintenance Disconnect Closed Bypass Disconnect Open Bypass Disconnect Closed Normal Mode Battery Mode Bypass Mode Ambient Over temperature Fan Fault System Over load Manual Turn On Manual Turn Off Unit Ove
25. the load Upon repair of the module it shall be reconnected to the critical load to resume redundant operation Any module shall also be capable of being taken off the critical load manually for maintenance without disturbing the critical load bus Module redundancy level shall be a predefined number of modules that are required to supply the full rated load With the number of connected modules equal to this value a malfunction of another module shall cause the load to be transferred automatically and uninterrupted to the bypass line by the use of the static mains bypass switch 2 2 3 System Protection The UPS shall have built in protection against surges sags and over current from the AC rectifier input source over voltage and voltage surges from output terminals of paralleled sources and load switching and circuit breaker operation in the distribution system The UPS shall be protected against sudden changes in output load and short circuits at the output terminals The UPS shall have built in protection against permanent damage to itself and the connected load for all predictable types of malfunctions Fast acting current limiting devices shall be used to protect against cascading failure of solid state devices Internal UPS malfunctions shall cause the module to trip off line with minimum damage to the module and provide maximum information to maintenance personnel regarding the reason for tripping off line The load shall be automatically
26. to a malfunction that would affect the output voltage Transfers caused by overloads shall initiate an automatic retransfer of the load back to the inverter only after the load has returned to a level within the rating of the inverter source C Back feed Protection Using another optional customer supplied contactor located upstream of the UPS Bypass input and whose trip coil control voltage comes from the input bypass line voltage the UPS shall provide a normally closed contact to be used for isolating the bypass source to protect the operator against back feed of energy resulting from a short circuit of the bypass line SCRs That is in the event that the UPS works on Battery mode and no main input Rectifier and Bypass is available the contactor cannot be closed So if the bypass line SCRs are short circuited the UPS will be still disconnected from the Bypass supply 2 3 5 Internal Maintenance Bypass A fully rated bypass circuit shall be fitted on all single module UPS systems to provide an alternative path for power flow from the alternate AC supply to the critical load for the purpose of maintaining the UPS when it is completely powered down A Maintenance Bypass protection shall be provided it will be activated when the Maintenance Bypass Switch is closed before the inverter shutdown 2 3 6 Man Machine Interface MMI A UPS Display and Control Panel Each UPS module shall be equipped with a 320 x 240 dot graphic LCD display Dimensi
27. uously providing the bypass source remains within the limits for the rated frequency of either 50 or 60Hz The inverter will change its frequency at 0 1Hz per second to maintain synchronous operation with the bypass This shall allow make before break transfers of the load between the inverter and the bypass mains supply If the bypass mains supply frequency falls outside of these limits the inverter shall revert to an internal digital oscillator that maintains the inverter output frequency to within 0 05 of nominal frequency in single module mode and 0 25 in parallel mode Phase to Phase Balance System logic shall provide individual phase voltage compensation to obtain phase balance of 1 under all conditions including up to 100 unbalanced non linear load Fault Sensing and Isolation Fault sensing shall be provided to isolate a malfunctioning inverter from the critical load bus to prevent disturbance of the critical ENP UPS 13 Guide Specifications Liebert NXe Marketing Team 23 Sept 2005 Version 1 0 10 20kVA Parallelable UPS System Marketing Management Team of Europe load voltage beyond the specified limits The inverter output static switch shall be switched off to isolate a malfunctioning module from the critical load E Battery Protection The inverter shall be provided with monitoring and control circuits to protect the battery system from damage due to excessive discharge Shutdown of the inverter shall be initiated
28. when the battery has reached the end of discharge EOD voltage The battery EOD voltage shall be calculated and automatically adjusted increased for reduced load conditions to allow for extended autonomy periods without damage to the battery 2 3 4 Static Bypass For time when maintenance is required or when the inverter cannot maintain voltage to the load due to sustained overload current limiting or malfunction a bypass circuit shall be provided for each single module that forms part of the UPS system The modular bypass circuit s shall provide for isolation of the inverter s and provide a path for power directly from an alternate AC bypass source The UPS control shall constantly monitor the availability of the inverter bypass circuit to perform a transfer The inverter bypass of each module shall consist of a static transfer switch operating in conjunction with the inverter output static switch The static switches shall denote the solid state devices that operating simultaneously can instantaneously connect the load to the alternate AC source A Manual Load Transfers A manual load transfer between the inverter output and the alternate AC source shall be initiated from the control panel B Automatic Load Transfers An automatic load transfer between the inverter output and the alternate AC source shall be initiated if an overload or short circuit condition is sustained for a period in excess of the inverter output capability or due
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