Liebert Series 610 User's Manual
Contents
1. 9 OPERATION DESCRIPTION 22242255 dea oh Oh a eae n 11 Continuous Powers de UE dte 11 Separating Tied Systems ee a a 13 Load Transfers Between UPS 13 Combined Loads on One System from Continuous Tie Operation 14 Combined Loads on One System to Continuous Tie 14 Design Criteria usta EI URS I Steps Mau I verte LINER E 14 Improper User 18 Tie Circuit Breaker or Logic Faults 19 2 8 1 What Happens If a Failure Occurs During a Power 19 2 8 2 What Happens If a Logic Failure Occurs During Power Transfer 19 28 8 Hardware Failures eee Re Et Rey RR 19 Recommendations Tie Circuit Breaker 0 19 CONTROL PANEL DESCRIPTION 20 Mimic Panel peria ch ee yd ha eim fr arr ax 20 Load Transfer REDS RE ER WIDE ES 21 Continuous Tie 12. 1931 aummiva 21901 1n03120139V L10A C 100 901 3S VHd 340 O 0311 SW31SAS WSLSAS NO 58 4 8 NO CO SSVdAH IN31SAS Sdn 8 NadO 01 HSNd 13 SINJISAS OL 50 ousa tang 831545 3ZINOHHONAS SAS 545 123135 SSVdA8 qan1avsia 1081 311 N3dO OL D SN3 1SAS 311 OL JIL NILNOD 85 2 5 SALVLS 1081 035013 N3dO 335 HSfld o 4 WALSAS o IN31SAS OL u3d1sNVu L 0519 510 10H NOO 2 WALSAS OL 2 QVO 5 0 OO WALSAS Z 01 U34SNVHL OL 40 OO 2 WALSAS OL 01 5 OL 10 OO 1 WALSAS OL QVO1U3JSNVHL OL 0 OO 0311 SIW31SAS W31SAS NO COD C avol 58 4 NOC SSVdA8 2 545 54 12 Operation Description 2 2 2 3 Separating Tied Systems The following sequence of operations describes the actions taken to separate two tied UPS systems Synchronize Systems From the CONTINUOUS TIE CONTROL section press the SYNCHRONIZE SYSTEMS butt
3. e e ad aee Ad 23 Control 001016 d sw n ET 28 Manual aay ase alg ER 24 4 0 OPERATING INSTRUCTIONS be 25 4 1 Initial System 25 4 2 Basic Op ration M e 25 4 2 1 Momentary Tie Load 25 4 2 2 Normal Transfer Operation 25 4 2 3 Maintenance Procedures Isolating Each UPS 25 4 2 4 Isolating a UPS System for Maintenance Combined Loads 26 4 29 5 Transfer of Load Between Two 26 4 2 6 Returning an Isolated System to Normal Operation End Combined Loads Operation 27 4 2 7 Maintenance Procedures Maintaining Power Tie Components 27 4 2 8 Maintenance Procedures Tie Control Logic Components 27 4 2 9 Abnormal Operations I ee e vat eg es ut 28 4 2210 Trouble Recovery PERMET C AC uum 28 4 2 11 Continuous 29 4 2 12 Isolatio
4. T PPS NES L L amp 5 2 mus a ET 3 im im exse zi t 1 1 4 1 32 Operating Instructions 4 2 13 Operation Scenarios Transfer Procedures Refer to the section listed below each figure for the operational procedure to perform the function indicated Figure9 From start up to normal operation loads to be split between two distribution feeders FROM TO Initial Conditions Prior to Startup Normal Operation System 1 System 2 System 1 System 2 M M M 55 Tie Open 3 Tie Open gt Y Tie Y Tie Load1 Load2 Load1 Load2 See 4 1 Initial System Start Up LEGEND Module SS 7 Static Bypass Switch Figure 10 From combined loads operation to loads split between two feeders FROM TO Combined Loads Operation Normal Operation System 1 System 2 System 1 System 2 M Tie Closed Tie Open Tie Load1 Load2 Load1 Load2 See 4 2 6 Returning an Isolated System to Normal LEGEND Module Operation End Combined Loads Operation SS Static Bypass Switch Figure 11 From conti
5. 34 Figure 14 Transfer 100 load on one system to 100 load on a second system a two step operation 34 Figure 15 Normal split load operations to Continuous Tie 35 Figure 16 Continuous Tie to normal split load operation 35 Figure 17 Continuous Tie to load on one system 35 Figure 18 Load on one system to Continuous Tie 36 Figure 19 One system in bypass to both feeders combined on remaining operational system 36 Figure 20 One system in bypass to Continuous Tie operation Option 1 37 Figure 21 One system in bypass to Continuous Tie operation Option 2 37 System Description 1 0 SYSTEM DESCRIPTION 1 1 1 2 1 3 Function The Liebert Continuous Power Tie M system provides the capability to momentarily or continuously parallel the output buses of two otherwise independent UPS Systems See Figure 1 It also provides manually initiated uninterrupted transfers of a critical load bus between the two UPS Systems This topology permits one UPS and its associated distribution system to be shut down for mainte nance while the load continues to be supplied by another UPS without the necessity of transferring the load to bypass during shutdown or restart of the UPS being maintained System Fl
6. System Voltage Control Signal The System Voltage Control signal is sent between UPS systems when they are in parallel Isolation amplifiers isolate the System Voltage Control signal levels between the two systems The System Voltage Control signal helps to maintain load sharing by giving all the modules a common reference signal for output voltage The System Voltage Control signal is not a critical signal Loss of the Sys tem Voltage Control signal should only cause a minor degrade in module sharing capability if at all 14 Operation Description Line Sync Signal The Line Sync signal is sent between UPS systems when they are in parallel Isolation amplifiers iso late the Line Sync signal levels between the two systems The Line Sync signal synchronizes the UPS systems to the Primary Bypass line By maintaining sync with the Primary Bypass uninterrupted transfers to the Primary Bypass can be made if a fault occurs while the systems are in parallel status signals sent between the UPS system and the Tie Controls are isolated through optical cou plers In addition all these status signals have impedance protection between the signal wire connec tions and the system power supplies and ground The Tie Control s power supply can use either UPS system s output as its source and the Tie Control power supply employs transformer isolation necessary voltage sensing occurs at the tie cabinet and employs fuse transformer a
7. Tie Control Unit wall or floor mounted or installed in the tie switchboard 6 Optional maintenance bypass breakers and test load distribution System Description 1 5 5 Modes of Operation See Figure 4 The Power Tie Uninterruptible Power System is designed to operate in the following modes 1 Normal Each load bus is fed from its respective UPS the tie breaker is open Each inverter 1s synchronized to its respective bypass source Each load is supplied by its inverter s with its bypass available as an alternate source Momentary Tie The load bus and the two UPSs are momentarily paralleled through the tie breaker Both UPSs are on line and the bypass source of one UPS will be selected as the primary sync source When one UPS drops off line then operation reverts to the Combined Loads Mode below Combined Loads Both loads are running on one UPS through the tie breaker The combined loads are supplied by the selected UPS s inverter s with that UPS s bypass available as the alternate and sync source This mode is typically used for servicing a UPS system including its bypass and bypass transfer controls without placing that UPS s load on bypass Continuous Tie The load bus and the available modules from the two UPS are continuously paralleled through the tie breaker Both UPSs are on line and one UPS s bypass source will be selected as the alternate bypass and sync source Although not normally done from this
8. 2 Liebert POWER AVAILABILITY CONTINUOUS POWER TIE CONFIGURATION USER MANUAL Series 610 Multi Module UPS amp EMERSON 1 0 1 1 1 2 1 3 1 4 1 5 2 0 2 1 2 2 2 8 2 4 2 5 2 6 2 1 2 8 2 9 3 0 3 1 3 2 3 3 3 4 3 5 TABLE OF CONTENTS SYSTEM DESCRIPTION Se c eni ete RR 1 Se sce atero e Sic eg SON NOR eae 1 System Flexibility s IND RE 1 Inter System Isolation and Reliability 1 Control Syst m Features zs utei ease A Ee ls 5 Operational 5 Lely Operational CHOICES ese teta ae at 5 1 5 2 Momentary Tie 6 Lover T1672 isis ta a tt ede fete EE 7 154 The System Components RE wae beth Ao iei i es Peri sh 8 1 5 5 Modes
9. Transferring This light indicates that the controls are transferring a load from one system to the other system Load Transfer Controls This section of the control panel gives indications and allows control of load transfers between the UPS Systems OK to Transfer Load 1 to System 1 This light indicates that it is safe to transfer Load 1 from UPS System 2 to UPS System 1 The trans fer occurs when the PUSH TO TRANSFER AFTER OK button is pressed but only if this light is on OK to Transfer Load 1 to System 2 This light indicates that it is safe to transfer Load 1 from UPS System 1 to UPS System 2 The trans fer occurs when the PUSH TO TRANSFER AFTER OK button is pressed but only if this light is on OK to Transfer Load 2 to System 1 This light indicates that it is safe to transfer Load 2 from UPS System 2 to UPS System 1 The trans fer occurs when the PUSH TO TRANSFER AFTER OK button is pressed but only if this light is on 21 Control Panel Description OK to Transfer Load 2 to System 2 This light indicates that it is safe to transfer Load 2 from UPS System 1 to UPS System 2 The trans fer occurs when the PUSH TO TRANSFER AFTER OK button is pressed but only if this light is on Transfer Control Disabled This light indicates that load transfers are not allowed because the systems are currently being put in parallel operation Transfer Function Available The Transfer Function Available lights indicate the t
10. mod ules are brought on line again the two UPS critical buses are again separated all in a make before break manner and without the need to transfer to bypass sources For continuous tied systems mod ratings must be identical There are two main control functions associated with the Continuous Tie Intersystem synchronizing and load sharing ntersystem transfer parallel control and switch gear Intersystem Sync and Power Sharing Synchronization between the UPS systems is accomplished in a two step process First a line sync source is chosen This will be the bypass power source of the UPS system that is the manually selected preferred bypass source Generally if one system is to be shut down for mainte nance after the two systems and loads are paralleled the preferred bypass source is the system remaining on line during the maintenance activities Both systems are synchronized to the preferred bypass Second once both UPSs are in sync with one bypass inter module sync is enabled This is a digital sync bus that holds all modules of both systems in phase lock operation with or without a bypass ref erence This ensures that the individual modules of both systems are tightly controlled to enable par alleling Load sharing between UPS systems is accomplished by interconnecting the load sharing circuitry the combination of the System Output Voltage Adjustment Control plus the Module Load Sharing Control
11. operational mode of the two UPSs could be shut down and isolated at this point as well System Isolation A selected load bus which has had all load removed via shutdown external maintenance bypass or downstream critical load switchover devices dual input PDU STS or A TS may be isolated from one or both UPSs for maintenance System Description Figure4 Power Tie system one line diagram DNIBIS DBNINIS ABALLVE 44831198 133 0251 34831198 315 5 Mi 4304 8 1 29 5594 32ONVN3INIVH ONDMIS 11 4 123NNDOSIQ 831198 3 1010 104100 SNA 19011180 104100 2v W31SAS Sdn ON Sad _ 33030 3170 JV 13 1892 1081 00 W31SAS 540 inaano 2v san OV 831411338 1 4901 904 79211182 14911182 1 ON HOLIAS 211415 LI 1 13 184 DUINDO 831545 ues uas 3n HOLIAS i 0181 9 15 1198 AU311VH 2 123NND3SIG eu sen Sdn 10 Operation Description 2 0 OPERATION DESCRIPTION 2 1 There are two types of operations which can be performed with the Liebert Continuous Power Tie Syst
12. 3 degrees Phase Difference inhibits a transfer if limits are exceeded b Voltage Difference detection for 8 Voltage Differential inhibits transfers if limits are exceeded if phase error is greater than 8 degrees the Voltage Difference will also exceed 5599 making the differential voltage detec tion a redundant phase detector 2 Load Verification circuitry prohibits transfer if the resulting total system load will exceed the capacity of one UPS System the system which will assume all the critical load once the transfer is complete 1 5 3 Continuous Tie See Figure 3 The Liebert Continuous Tie system is a topology that extends the concept of a manually initiated momentary tie of UPS critical load buses by providing the capability to continuously parallel the out put buses of two otherwise independent UPS Systems the performance features of momentary tie system are available in the continuous tie system In the unlikely event that one UPS system or both UPS systems have only partial available capacity e g loss of one or more modules in an otherwise functional system this partial capacity system can be continuously tied to a second full or partial capacity system powering simultaneously the now tied two critical buses This results in a single fully redundant UPS system powering two different distribution strings through a single UPS critical output bus When the off line whether for maintenance or repair
13. The loss of which will be annunciated through the diagnostic system In a tied system configuration these critical functions coupled with the Tie Control Unit provide the degree of load share control required while maintaining system to system independence and 1solation Operational Description Operational Choices See Figure 3 Momentary Tie provides intersystem transfer capability without bypass required permitting on line maintenance of the unloaded UPS and distribution system Continuous Tie permits tying the available modules in both systems together to act as a single multi module system in the unlikely event that multiple module failures have reduced the capacity of the UPS system s System Description 1 5 2 Momentary Tie Operation See Figure 3 Momentary Tie operation provides manually initiated uninterrupted transfers of a critical load bus between two otherwise independent multi module UPS systems This topology permits individual UPS shutdown for maintenance while its load continues to be supplied by another UPS without the necessity of transferring the load to bypass during shutdown or restart of the UPS being maintained A major goal in the design of Momentary Tie Operation was to provide the same high reliability asso ciated with a standard parallel redundant system while providing more system flexibility for mainte nance purposes The key to maximizing reliability of this configuration is to maintain as
14. a tied systems operation When the SYNCHRONIZE SYSTEMS BUTTON 18 first pressed the button will light on indicating that tied systems operation is desired The systems synchronize to the bypass source selected by the PRIMARY BYPASS SELECT switch Once the systems are synchronized and all other conditions to safely tie the systems have been met the OK TO TIE SYSTEMS light turns on Press the PUSH TO TIE SYSTEMS AFTER OK button to close the appropriate circuit breaker to put the systems in parallel To separate tied systems press this button again The light turns off indicat ing the tied condition 15 no longer desired If it is safe to separate the systems the OK TO OPEN TIE light turns on Press the PUSH TO OPEN TIE AFTER OK button to open the Tie breaker Both UPS systems will resume independent opera tion Push to Tie Systems After OK Once the OK TO TIE SYSTEMS turns on pressing this button closes the appropriate circuit breaker to tie the systems Push to Open Tie After OK Once an OK TO OPEN TIE turns on pressing this button opens the Tie circuit breaker to separate the systems Control Inhibits This section of the control panel provides alarm indicators which prevent transfers and parallel oper ation of the UPS systems Phase Lockout This light indicates the systems are not synchronized It is a waveform based redundant check of syn chronization The primary sync indicator is based on UPS module sync bus coincidence
15. must be within tolerance Third the instantaneous voltage differential between UPS system voltages must be within tolerance But regardless of synchronization status a critical load will not be allowed to transfer to a system running on its bypass source Transfers from a bypass source to a system on UPS is permitted Circuit Breaker Failure If a Close or Open command to a circuit breaker fails to return a confirmation of completion within an acceptable time period the Power Tie logic initiates corrective actions based on the system s initial state and current state Loss of Tie Controls Since UPS system independence has been stressed throughout the design of this Power Tie configura tion complete loss of Tie Controls will not affect either UPS system operating in any Momentary Tie Combined Loads Mode configuration 4 2 10 Trouble Recovery While failures are extremely unlikely the Power Tie system has been designed to restart from any system operating mode once the fault has been corrected Refer to 1 5 5 Modes of Operation for a description of the operating modes 28 Operating Instructions 4 2 11 Continuous Tie Systems A UPS system that has lost one or more modules can be taken off line for service The UPS system with partial capacity can be continuously tied to the other UPS system also full or partial capacity and the critical loads of both systems are protected by the single fully redundant UPS Whe
16. of the UPS systems The SYNCHRONIZING light on the Control Status panel turns on and stays on during synchroniza tion Checking for Phase Voltage and Capacity The Power Tie logic checks these UPS system parameters phase voltage and capacity to determine if they are within their proper limits The OK TO TIE SYSTEMS light from the CONTINUOUS TIE CONTROL section of the control panel turns on when these parameters are within their proper lim its OK to Tie UPS Systems After the OK TO TIE SYSTEMS light turns on press the PUSH TO TIE SYSTEMS AFTER OK but ton on the CONTINUOUS TIE CONTROL panel The TIE CB tie circuit breaker light turns on indicating the breaker has closed Both of the SYSTEMS TIED lights on the LOAD 1 and LOAD 2 panels turn on to indicate the tied UPS system status Systems may paralleled with the UPS systems initially separate or if both loads are initially on one UPS system while the other was being serviced With the two UPS systems in parallel the voltage synchronization and power sharing loops become tied Together these controls hold the module load sharing to within 5 of load current Should one or the other control be inoperative the Power Tie logic can still maintain load sharing within accept able limits 11 Operation Description Figure5 Control panel layout eger SIHL QNIH38 NO Q31v201 SHANVIYE LINDUID JIL 5 01108
17. of the two systems when the tie breaker between the systems is closed This operation is analogous to bringing a module on line in a multi module system The voltage synchronizing and load sharing loops also back up each other Together they hold module load sharing to within 5 of load current Should one or the other loop be inoperative load sharing can still be maintained within acceptable limits System Description 1 5 4 Synchronizing activity takes place automatically once the preferred source is chosen and a manually initiated SYNCHRONIZE SYSTEMS signal is given Visual indicators show that the systems synchronizing and when the systems are ready for the manually initiated automatically controlled paralleling sequence Continuous Tie Transfer Parallel Control The transfer load and tie controls operate the tie breakers between systems in a sequential manner to allow paralleling and make before break transfer of loads Once the synchronizing sequence is com plete visual indicators show parallel operation is permitted The operator initiates the closing of the tie breaker Once initiated the tie command is executed when conditions of sync and voltage match ing are verified prior to tie execution In essence the tie breaker closes and two UPS systems are par alleled With the two systems operating in parallel only one bypass circuit is active Should something occur that requires the UPS to automatically transf
18. on UPS inverter output Transfers to a UPS system operating on its bypass source cannot be initiated due to logic lockouts However a critical load initially on a UPS system s bypass source can be transferred to the other UPS system operating on inverter output In addition to checking system configurations the Power Tie logic uses three independent criteria for verifying synchronization The Power Tie logic verifies system voltages are within proper limits And the Power Tie logic verifies the UPS system which will accept the additional load has sufficient UPS capacity The logic intelligently determines which system to synchronize with which UPS system capacity to check and which load s to check based on which system the operator selects to transfer load The Power Tie logic the present system configuration The Power Tie logic automatically returns both UPS systems to independent operation by resynchro nizing them to their own bypass source and separating all control loops between the systems when the transfer is complete Maintenance Procedures Isolating Each UPS System Power Tie system capabilities permit each UPS system to be completely isolated for service while its load continues to be powered and protected by the other UPS system In addition since all controls of each system are electrically isolated from the other system any operation or fault on the system being serviced does not affect the system suppl
19. the PUSH TO TIE SYSTEMS AFTER OK button The Tie breaker will close to put the systems in parallel operation 5 Both systems will share both critical load feeders Returning Parallel Systems to Normal Operation End Continuous Tie Both Load circuit breakers and the Tie circuit breaker will be initially closed 1 Press the SYNCHRONIZE SYSTEMS button The light turns off 2 Wait for the OK TO OPEN TIE light to turn on 3 Oncethe OK TO OPEN TIE light turns on press the PUSH TO OPEN TIE AFTER OK button The Tie circuit breaker opens separating the systems 4 Both UPS systems will supply their normal load feeders and operate independent of each other 29 Operating Instructions Maintenance Procedures Tie Control Logic and Power Components Refer to the procedures in 4 2 3 Maintenance Procedures Isolating Each UPS System to iso late the UPS s load circuit breaker and the associated downstream feeders for service By using downstream switchover devices for the individual critical loads such as ATSs or dual input PDUS the load feeder components to be maintained are de energized critical load operations are transferred to the feeder which will power the combined loads There are three approaches to maintaining the Tie circuit breaker and its associated circuit compo nents depending on the convenience and isolation desired 1 Single fixed mount Tie circuit breaker Complete UPS system and critical loads must be p
20. through the use of fiber optic technology as well as trans former and impedance isolation techniques in critical control circuits The possibility of signal and ground loops through control interconnections has been eliminated by isolating all control signals between each UPS system and the Tie Controls See Figure 3 For exam ple a water leak over one UPS could effectively short all the control conductors together causing a catastrophic fault in one system Through the noted isolation techniques this fault will not be propa gated through intersystem e g load sharing control conductors control wiring to the second system System Description Basic Dual Bus Power Tie one line diagram Figure 1 315 5 311 u3 Ud 3ND SNIHIS 198 01 123NNDOSICQ 9311 8 indin 2v 508 19214182 104100 W31SAS San 5 5 AN311NH A8311V8 MO L3NIEV2 1131 2 W31SAS 9 H2AIAS 1 15 UN San San t 2v 13NIEV2 TONINDI 0 799311182 adis 1 ava 1815 san 2 inaina av anand san 8 2v 9 901815 8311 8 oT mua 13818493 OYANDI 1315
21. 45 5 911415 3 n DW 540 15 System Description INIT 3ND DN 83480 3190 ON ANANI 29 13 1892 H31SAS ONIMIS 5831198 n n Aadria CH inant anaon san 2 inaina 508 wares 5 ifdinn av sun 8 2v 31545 3 ov 1 avoi 9 115 9 1815 WIWI ONIBIS 9NIBIS aval iva 123NND2SIG 13NNDOSII _ wm NNW 5 13 1893 0805 831545 13 18 2 1031 02 315 5 SNL KI TAE 9815 1815 6 oe M CAD 4 HOLIAS 311415 VIS 8 UN 540 TON 37000 San 2 DN Sdn 1 1 HOLIAS 1 1 1 1 7 N INDILVIDS wNOISI 31548 33131 S i 01 Figure 2 Power Tie systems fault isolation issues System Description W3i1SAS 311 8304 3N 7 3ND ANANI v 138189 5 91815 31198 1293NNDOSIQ 4921198 0 1 4100 29 508 19211142 20 san 2 inainn ov san 104100 2v 31545 Sdn 29 331406238 control interf
22. Figure 19 One system in bypass to both feeders combined on remaining operational system FROM TO One System in Bypass Mode Combined Loads Operation System 1 System 2 System 1 System 2 Momentary Tie Tie lt gt for transfer of Tie Closed Load 2 to Load1 Load2 System 1 Load1 Load2 See 4 2 3 Maintenance Procedures Isolating Each LEGEND Module UPS System SS Static Bypass Switch 36 Operating Instructions Figure 20 One system in bypass to Continuous Tie operation Option 1 FROM TO One System in Bypass Mode Restart Bypassed System System 1 System 2 System 1 System 2 Partial M 88 55 55 full C 8 Ga Tie on gt Tie omo Tie Tie Load1 Load2 Load1 Load2 TO Continuous Tied Systems System 1 System 2 Tie Closed Tie LEGEND M Module Load1 Load 2 SS Static Bypass Switch Restart the bypassed system then use the procedures in Tying the UPS Systems Continuous Parallel Operations in Section 4 2 11 or see Figure 21 Figure 21 One system in bypass to Continuous Tie operation Option 2 FROM TO One System in Bypass Mode Combined Loads Operation System 1 S
23. PS System 2 The transfer to be performed is automatically determined by the current state of the Tie and Load circuit breakers The button turns on indicating that the sequence is armed When the control logic deter mines that all conditions for a safe transfer have been met it turns on the appropriate OK TO TRANSFER light Push to Transfer After OK This button starts the transfer after the OK TO TRANSFER light turns on 22 Control Panel Description 3 3 3 4 Continuous Tie Control This section of the control panel provides indicators and controls for the control of tied systems functions OK to Tie Systems This light indicates that 1618 safe to tie UPS Systems 1 and 2 together The systems are tied after the PUSH TO TIE SYSTEMS AFTER OK button is pressed but only if this light is on OK to Open Tie This light indicates that it is safe to separate UPS Systems 1 and 2 The Tie circuit breaker opens after the PUSH TO OPEN TIE AFTER OK button is pressed but only if this light 1s on Tie Control Disabled This light indicates that the tie controls are disabled because the systems are transferring a load Primary Bypass Select This switch is used to select which systems bypass to synchronize with when a tie sequence is initi ated It is also the bypass source the Loads will be transferred to should a fault occur while the sys tems are in parallel operation Synchronize Systems This button is used to begin and end
24. Power Tie system maintains the critical bus function under fault conditions What Happens If a Failure Occurs During a Power Transfer During normal operation the Power Tie logic maintains system isolation Upon power transfer initia tion the Power Tie logic checks the circuit breaker CB positions The Power Tie logic inhibits the power transfer if the circuit breaker positions are incorrect For Continuous Tie if all circuit breakers are in their correct positions then all circuit breakers momentarily remain closed tying both systems together The power transfer sequence stops The static bypass becomes the backup If the operator selects momentary Power Tie the isolation circuit breaker opens If this circuit breaker fails to open the system returns to its initial configuration maintaining the critical bus What Happens If a Logic Failure Occurs During Power Transfer If a failure occurs before the power transfer the Power Tie logic inhibits the power transfer operation If a failure during the power transfer one of the following occurs If the failure occurs before overlap period has timed out the Power Tie logic returns the system to its initial configuration f failure occurs after overlap period has expired e g the isolating breaker has already been com manded to trip the Power Tie logic completes the transfer f the power transfer does not complete e g the isolating breaker fails to trip within an accept abl
25. This light normally turns on while the systems are synchronizing prior to a Tie or Transfer operation If the light does not turn off contact Liebert Global Services for assistance 23 Control Panel Description 3 5 Voltage Lockout This light indicates the system voltages are too far apart to allow safe transfers and parallel operation of the UPS systems To correct this condition adjust the UPS system voltage to proper levels If both system voltages are adjusted correctly and the PHASE LOCKOUT alarm is not present then check the voltage detection circuitry Contact Liebert Global Services for assistance Load Lockout This light indicates insufficient UPS capacity to perform the selected operation The control logic intelligently checks the UPS systems and the Loads based on the specific operation in progress Verify UPS capacity and shed load as necessary until UPS capacity is not being exceeded If UPS capacity is sufficient then check the load capacity detection circuitry Contact Liebert Global Services for assistance Logic Failure This light indicates that a logic failure has occurred No Tie operations are allowed while this condi tion exists Check all tie control logic functions to determine the source of the fault Contact Liebert Global Ser vices for assistance Lamp Test This button is pressed to check all indicators on the MIMIC and CONTROL PANEL Manual Controls These controls are located on a pa
26. ace diagram Figure3 Power Tie systems a t avo 4907 ONIJIS ONISIS 192111842 719210183 ONINIS ONISLS A8311VH AN311VH 1 148 00 Q5 123NNDOSIG 133NND2SId Ne aualivd IMNON 540 W31SAS H24IAS 211915 SINTON Sdan E WYLNDD 311 1815 1 3 1081 02 W31SAS HJAIAS 211415 TON 31ndOn San Sdn System Description 1 4 1 5 1 5 1 Control System Features key control feature necessary for successful momentary or continuous tie operation of two UPSs is the dynamic load current sharing function A key design requirement for maximizing multiple system reliability and inverter availability in tied configurations is assuring maximum system independence under the normal separated operating conditions Liebert has incorporated a number of unique solutions in your Power Tie System to accomplish these high availability high reliability performance goals Digital Controls Digital Controls provide more precise control than analog techniques They permit the direct use of fiber optics for the most critical inter system control functions without the need for the additional complexity of A D and D A converters Digital Controls are very reliable implemented using inter nally redundant ASICs applicati
27. al and power protection in a single flexible package Monitoring and control from systems of any size or location on site or remote e Service and support through more than 100 service centers around the world and a 24 7 Customer Response Center 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 2005 Liebert Corporation rights reserved throughout the world Specifications subject to change without notice 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 30030 12 05 Rev 2 Technical Support Service Web Site www liebert com Monitoring 800 222 5877 monitoring liebert com Outside the US 614 841 6755 Single Phase UPS 800 222 5877 upstech liebert com Outside the US 614 841 6755 Three Phase UPS 800 543 2378 powertech liebert com Environmental Systems 800 543 2778 Outside the United States 614 888 0246 Locations United States 1050 Dearborn Drive P O Box 29186 Columbus OH 43229 Italy Via Leonardo Da Vinci 8 Zona Industriale Tognana 35028 Piove Di Sacco PD 39 049 9719 111 Fax 39 049 5841 257 Asia 7 F Dah Sing Financial Centre 108 Gloucester Road Wanc
28. ce and all control loops between the systems separate 13 Operation Description 2 4 2 5 2 6 Combined Loads on One System from Continuous Tie Operation To combine two loads onto one system perform a LOAD TRANSFER BETWEEN UPS SYSTEMS 2 3 Load Transfers Between UPS Systems The operator selects the system he wants to main tain both loads using the TRANSFER LOAD TO buttons The operator can then proceed with the rest of the procedures in 2 3 Load Transfers Between UPS Systems Combined Loads on One System to Continuous Tie Operation To create a continuous tie from combined loads on one UPS system perform a CONTINUOUS TIE operation see 2 1 Continuous Power Tie The Power Tie logic selects the proper circuit breaker to operate Once the tie operation begins the two UPS systems synchronize to the selected primary bypass source The Power Tie logic Checks the system configuration Verifies synchronization Verifies system voltages are within limit Verifies both the on line UPS systems have sufficient capacity to maintain the combined loads before allowing the systems to tie Design Criteria The ultimate power goal in the design of the Liebert Continuous Tie System is to provide maximum UPS availability and maintainability without compromising the inherent reliability of the UPS sys tems We have designed the Continuous Power Tie system to minimize or eliminate possible failure modes and their effect
29. e time period the Power Tie logic returns the system to its initial configuration If the failure occurs after the transfer has occurred the static bypass becomes the backup Hardware Failures Improper operation of the Power Tie are caused primarily by tie circuit breaker failures The Power Tie logic monitors the Close and Open sent to the circuit breakers If the breaker command is not completed by the breaker within an acceptable time period the Power Tie logic takes corrective action The Power Tie implements corrective action based on the operation being performed and the current system configuration The Power Tie logic takes protective action if a fault occurs on a UPS system during a load transfer or while the UPS systems are in continuous parallel operation The Power Tie logic takes action based on the current system configuration and the active operation to minimize the affects of the fault The Power Tie controls add additional protection to the individual UPS systems And the protective controls of the individual UPS become an integral part of the overall fault protection scheme used by the Power Tie controls Recommendations Tie Circuit Breaker Selection Consider using non automatic circuit breakers for continuous Power Tie applications The circuit breaker function should not be the primary fault limiting function Using non automatic circuit breakers eliminates a primary circuit breaker failure mode the trip
30. em Create a continuous tie between the critical buses of two UPS systems Transfer of a critical load between two UPS systems Continuous Power Tie The following sequence of operations describe the actions to take to continuously tie two UPS systems together See Figure 5 Selecting a Line Sync Source From the Continuous Power Tie Control Panel select SYS1 or SYS2 using the PRIMARY BYPASS SELECT switch Should a fault occur with the UPS systems in parallel the chosen line sync source becomes the bypass source for the critical loads Synchronizing the UPS Systems From the Continuous Power Tie Control panel press the SYNCHRONIZE SYSTEMS button The Power Tie logic checks for proper state indications from the UPS systems and the circuit breakers The SYNCHRONIZE SYSTEMS button light turns on to indicate the UPS systems have begun syn chronizing to the selected primary bypass The PRIMARY BYPASS light from the selected UPS system UPS System 1 or UPS System 2 turns on to identify the primary bypass With the line sync controls tied the continuous Power Tie logic checks the inter module sync signals for coincidence The Power Tie logic ties the inter module sync signals when coincidence occurs This redundant digital sync bus holds all modules in sync with or without a bypass reference Using the redundant digital sync makes certain the individual modules of both systems are tightly con trolled to enable the parallel operation
31. em to Normal LEGEND M Module Operation End Combined Loads Operation SS Static Bypass Switch Figure 14 Transfer 100 load on one system to 100 load a second system a two step operation FROM TO Combined Loads Operation on System 1 Combined Loads Operation on System 2 System 1 System 2 System 1 System 2 1 2 1 2 Momentary Tie for transfer Tie Closed of Load 2 to System 2 Tie Closed then Momentary Tie for Load1 2 transfer Load 1 to Load1 Load2 System 2 See 4 2 5 Transfer of Load Between Two Systems LEGEND M Module SS Static Bypass Switch 34 Operating Instructions Figure 15 Normal split load operations to Continuous Tie FROM Normal Operation System 1 System 2 M SS SS M poses Load1 Load2 See 4 2 11 Tying the UPS Systems Continuous Parallel Operations Figure 16 Continuous Tie to normal split load operation FROM Continuous Tied Systems System 1 System 2 M C Module returned Tie Closed to service Tie Load1 Load2 See 4 2 11 Returning Parallel Systems to Normal Operation End Continuous Tie Figure 17 Continuous Tie to load on one system FROM Continuous Tied Systems S
32. er to bypass then all the load will be supplied through the static switch and bypass circuit breaker of the system that was selected as the preferred source When the two systems are paralleled it 1s possible to 1solate and then shut down one system entirely for maintenance The system to be shut down must be the one that 15 not the designated preferred source Shutdown is accomplished by first opening the System Isolation Breaker of the selected sys tem Once this action is taken all the load remains on the preferred system three load sharing control circuits between systems are disconnected with the opening of the Sys tem Isolation Breaker At this time sync control of the off line system will be returned to its own local bypass source and the system can be operated in its normal manner for testing and maintenance Restart of the systems under maintenance is accomplished in the normal manner Once the system has been brought on line the to the on line system can be initiated The sequence from this point 15 similar to the sequence that paralleled the two systems initially As soon as the OK TO TIE SYSTEMS indication is given the System Isolation Breaker can be closed once again paralleling the two systems and enabling the load sharing loops between the two Taking the systems out of parallel operation is manually initiated The tie breaker automatically opens separating the loads onto their respective UPS systems The int
33. ersystem power sharing is dis abled and the sync circuits revert to independent operation Tie System Components See Figure 4 A Liebert Power Tie Uninterruptible Power System consists of the following basic components 1 Two complete independent UPSs with individual load buses each with the capability to source the combined critical load of the two load buses Each of the two UPSs may be a single module system SMS or a multi module system 5 2 Two discrete system input sources each with the capacity to source the combined critical load two input sources need only be acceptable with regard to frequency and voltage The two sources do not require an in phase relationship although under this circumstance a Lockout alarm will be indicated until the Sync Systems button is pushed Then the Lockout should clear 9 Two discrete bypass sources each with the capacity to source the combined critical load The two bypass sources need only be acceptable with regard to voltage and frequency such as the utility or an emergency generator and are not required to be in phase However if make before break downstream load switching equipment such as automatic transfer switches static transfer switches STS or dual input power distribution units is intended to be used having the two bypass sources in sync is preferable 4 One system isolation and tie switchboard containing system isolation breakers and tie breaker s
34. exibility In the unlikely event that one or both UPS systems have only partial available capacity e g loss of one or more modules in an otherwise functional system this partial capacity system can be continu ously tied to a second full or partial capacity system powering simultaneously the now tied two crit 1cal buses This results in a single fully redundant UPS system powering two different distribution strings through a single UPS critical bus When the off line whether for maintenance or repair modules are brought on line again the two UPS critical buses are again separated without the need to transfer to the bypass source For continu ous tied systems module and kW ratings must be identical Inter System Isolation and Reliability For multiple UPS installations at a single site best total system reliability is achieved when system to system independence is maximized However to transfer loads or parallel critical buses between multiple UPS systems a certain amount of cross connected system to system power and signal con ductors are required See Figure 2 Proper implementation of power conductor runs and circuit breaker placement will minimize the risk that a catastrophic critical bus fault e g a dropped wrench on one system will cause a failure in a second system Liebert has minimized the risk of system to system electrical noise susceptibility and faults in sys tem to system copper wire control circuitry
35. hai Hong Kong 852 25722201 Fax 852 28029250 EMERSON
36. ies Fixed mount or Drawout By using two Tie circuit breakers in series each circuit breaker and its associated buswork can be conveniently and completely de energized for service Refer to 4 2 3 Maintenance Procedures Isolating Each UPS System Using appropriate safety equipment and procedures these components can be serviced while one of the two systems remains energized Maintenance Procedures Tie Control Logic Components Unless the controls are in a continuous parallel mode or currently in the process of transferring a load it is possible to service the Tie controls by taking a few precautions Since all control signals are isolated they can be safely de energized for maintenance without affecting the UPS systems 27 Operating Instructions 4 2 9 Abnormal Operations Improper Transfer Transfers can not be performed unless the TO TRANSFER LOAD TO SYSTEM 089 light turns on This makes it difficult to begin an improper transfer The source feeding the UPS modules does not matter because the UPS inverter output is isolated from the rectifier The logic permits transfers to and from a UPS system with the UPS modules running on Utility Bat tery or Engine generator so long as the system accepting the load 1s running on inverter output Synchronization is verified by forcing the system to meet three independent criteria First all on line module oscillators must be synchronized Second the voltage zero crossings
37. laced on a reliable maintenance bypass source e g standby engine generator to de energize the Tie circuit breaker Using appropriate safety equipment and procedures the Tie circuit breaker can be serviced while remaining energized 2 Single drawout Tie circuit breaker Drawout mechanism permits servicing the Tie circuit breaker and associated circuitry while the Power Tie system is in its normal mode of operation To de energize the drawout carriage plug in stubs and buswork however one feeder at a time must be isolated for service Refer to 4 2 3 Maintenance Procedures Isolating Each UPS System Using appropriate safety equipment and procedures these components can be serviced while remaining energized 3 Two Tie circuit breakers in series Fixed Mount or Drawout By using two Tie circuit breakers in series each circuit breaker and its associated buswork can be conveniently and completely de energized for service Refer to 4 2 3 Maintenance Procedures Isolating Each UPS System Unless the controls are in a continuous parallel mode or currently in the process of transferring a load it is possible to service the Tie controls by taking a few precautions Since all control signals are isolated they can be safely de energized for maintenance without affecting the UPS systems Abnormal Operations Improper Transfer Transfers cannot be performed unless the OK TO TRANSFER LOAD 4 TO SYSTEM 9 light turns on This makes it difficult
38. late the UPS s load circuit breaker and the associated downstream feeders for service By using downstream switchover devices for the individual critical loads such as ATSs or dual input PDUS the load feeder components to be maintained are de energized critical load operations are transferred to the feeder which will power the combined loads There are three approaches to maintaining the Tie circuit breaker and its associated circuit compo nents depending on the convenience and isolation desired 1 Single fixed mount Tie circuit breaker Complete UPS system and critical loads must be placed on a reliable maintenance bypass source e g standby engine generator to de energize the Tie circuit breaker Using appropriate safety equipment and procedures the Tie circuit breaker can be serviced while one or both systems remain energized depending on isolation breaker usage 2 Single drawout Tie circuit breaker Drawout mechanism permits servicing the Tie circuit breaker and associated circuitry while the Power Tie system is in its normal mode of operation To de energize the drawout carriage plug in stubs and buswork however one feeder at a time must be isolated for service Refer to 4 2 3 Maintenance Procedures Isolating Each UPS System Using appropriate safety equipment and procedures these components can be serviced while one or both systems remain energized depending on isolation breaker usage 3 Two Tie circuit breakers in ser
39. much independence as possi ble between systems and retain the same basic concepts in transfer philosophy that have served so well in current standard Series 610 UPS systems as well as previous Series 500 designs The only time intersystem controls are active is during the actual operation of transferring loads back and forth between the UPS systems a period of a few cycles At all other times the UPS systems are operating independently Following are two main functions associated with the Momentary Tie Intersystem synchronizing ntersystem transfer control and switchgear Intersystem Synchronizing Synchronization between UPS systems is accomplished by momentarily synchronizing one UPS out put the system accepting the load to the same sync source the other system is using The internal clock frequency reference will be used if the Bypass Source is not available as a frequency reference When sync signal coincidence is achieved the module sync buses will be tied to lock the modules of both systems in tight synchronization The associated Tie Control Unit does not perform the sync function but instead simply supplies each UPS with a sync reference signal depending on which direction the transfer is going to go Synchronization of each UPS will automatically revert to its internal bypass sync at the conclusion of the transfer sequence Momentary Tie Transfer Controls The transfer control operates the Tie Breaker and System Isolati
40. n for Maintenance 31 4 2 13 Operation Scenarios Transfer Procedures 33 FIGURES Figure 1 Basic Dual Bus Power Tie one line 2 Figure2 Power Tie systems fault isolation 158 3 Figure3 Power Tie systems control interface 4 Figure4 Power Tie system one line 10 Figure5 Control panel layout 12 Figure Power Tie system fault isolation 16 Figure 7 Power Tie systems fault 17 Figure 8 Power Tie system one line diagram 32 Figure 9 From start up to normal operation loads to be split between two distribution feeders 33 Figure 10 From combined loads operation to loads split between two feeders 33 Figure 11 From continuous tied systems to loads split between two systems 33 Figure 12 Transfer both load feeders to one UPS 34 Figure 13 Both feeders on one system to normal operation
41. n service is complete the UPS module s can be brought on line again and the system separated without plac ing a critical load on the Bypass source Normal Operating Configuration Initially both load isolation breakers are closed The Tie breaker is open Both UPS systems are on inverter output See Figure 5 Once the Tie operation is initiated the systems synchronize to the selected Primary Bypass source The Power Tie logic checks the system configurations verifies synchronization verifies system volt ages are within proper limits and verifies that the on line UPS modules of both system have suffi cient capacity to maintain the combined loads before allowing the systems to be tied Tying the UPS Systems Continuous Parallel Operations Both load isolation circuit breakers will be initially closed and the Tie circuit breaker initially open The Tie circuit breaker is closed if the systems are in a combined loads mode Both UPS systems will be on inverter output 1 Select the Primary Bypass source for the combined systems with the PRIMARY BYPASS SELECT switch in the CONTINUOUS TIE CONTROL section of the control panel If System 1 will be the Primary Bypass then the switch should be in the SYSI position 2 Pressthe SYNCHRONIZE SYSTEMS button in the CONTINUOUS TIE CONTROL section of the control panel The push button turns on 3 Wait for the OK TO TIE SYSTEMS light to turn on 4 After the OK TO TIE SYSTEMS light turns on press
42. nd or imped ance protection 15 Operation Description Figure 6 Power Tie system fault isolation issues 315 5 311 AJADA 3411 3ND ANNI SSVdAG 15 A83J1VH 01 123 02514 AH311V8 3 70008 indin 29 SNE 19011140 108100 JY W31SAS Sdn AN211VE A311v8 etah iden 1 H2LIAS 311415 TON anaon San JINCOW Sdn _ mm ON Dad 93080 3190 0 OV L3NIHV2 JIMINDO W31SAS san 2 inaano av san 8 inani 2v a31411338 V 4 1 quo avon 19210182 19011180 815 15 43831148 13 1892 DBINDO 1545 1 1 t 4 HOLIAS 311415 TON Sdn Sdn INGILVY 1051 W31SAS 231NI 16 Operation Description Figure 7 Power Tie systems fault tolerance 01815 San W3i1SAS 311 Y3A0d 347 3ND SSVdAH 32ONVN3INIVH 9 1815 83119 Ui 123 02510 A3311v8 3 in ns 104100 2v SNE 79211183 109100 09 WILSAS Sdn 1 5 831 198 123NNOOSId 333119 13 18 3 1081802 W31SAS H24IAS O
43. nd the Control door The Load 1 breaker should close when the button 1s pressed 2 Press the CLOSE LOAD 2 button located behind the Control door The Load 2 breaker should close when the button is pushed NOTE The operation be performed with the UPS on bypass or inverter output The logic confirms that the Tie breaker is open to prevent inadvertently putting the systems in parallel 3 Onceone or both UPS systems are on line a transfer of either critical load between systems or a continuous tie operation can be performed subject to conditions outlined in 1 0 System Description and 2 0 Operation Description and the following sections Basic Operation Momentary Tie Load Transfers A momentary tie operation is used to transfer a critical load from a UPS system which requires 18018 tion for maintenance to another UPS system without placing the critical load on utility bypass The isolated UPS system can be serviced while the critical load remains protected by a fully func tional UPS system Once service is complete perform another Momentary tie operation to return the critical load to its normal UPS system This can be done without placing the critical load on utility bypass Normal Transfer Operation Configurations Transfers of a critical load between systems can be performed from several initial system configura tions The guiding criteria for permitting transfers 15 that the critical load must remain
44. nel behind the Control Panel door They are provided to assist in initial system start up and provide emergency manual breaker trip capability During normal opera tions they should not need to be used Close Load 1 This button closes the Load 1 circuit breaker during start up It only functions if the Tie breaker is open Close Load 2 This button closes the Load 2 circuit breaker during start up It only functions if the Tie breaker is open Trip Load 1 This button is used to manually trip the Load 1 circuit breaker and is provided for emergency pur poses The light on this push button will go out when load 1s being supplied through the breaker Pressing this button when the light 18 out will result in loss of power to an on line load Trip Load 2 This button is used to manually trip the Load 2 circuit breaker and is provided for emergency pur poses The light on this push button will go out when load 1s being supplied through the breaker Pressing this button when the light 18 out will result in loss of power to an on line load Trip Tie This button is used to manually trip the Tie circuit breaker and is provided for emergency purposes 24 Operating Instructions 4 0 OPERATING INSTRUCTIONS 4 1 4 2 4 2 1 4 2 2 4 2 3 Refer to Figure 5 Initial System Start Up load circuit breakers and tie circuit breakers are initially open 1 Press the CLOSE LOAD 1 button located on the panel behi
45. nsfers follow this same procedure The logic knows whether Load 2 is to be transferred from System 2 to System 1 or Load 1 is being returned to System 1 The SYSTEM 1 button is pressed for both operations because the systems initial configuration make only one choice possible 26 Operating Instructions 4 2 6 4 2 7 4 2 8 Returning an Isolated System to Normal Operation End Combined Loads Operation One Load circuit breaker and the Tie circuit breaker are closed The Load circuit breaker of the iso lated system which was being serviced will be opened 1 Select the UPS system to accept the load Press the TRANSFER LOAD TO SYSTEM 8 If System 2 had been isolated then press the SYSTEM 2 button Load 2 will be returned to System 2 2 Wait for the OK TO TRANSFER LOAD light to turn on If System 2 was isolated then the OK TO TRANSFER LOAD 2 TO SYSTEM 2 light should turn on when it is safe to perform the transfer 3 After the OK TO TRANSFER LOAD 2 TO SYSTEM 2 light turns on press the PUSH TO TRANSFER AFTER OK button The transfer will be performed If System 2 was isolated then the Load 2 breaker will close and the Tie circuit breaker opens after the overlap period times out 4 Both UPS systems will now be supplying their normal Load and operating independent of each other Maintenance Procedures Maintaining Power Tie Components Refer to the procedures in 4 2 3 Maintenance Procedures Isolating Each UPS System to iso
46. nuous tied systems to loads split between two systems FROM TO Continuous Tied Systems Normal Operation System 1 System 2 System 1 System 2 X EE Continuous Tie C operation for Tie Closed Tie Open module out of Tie Tie service Load 1 Load2 Load 1 Load2 See 4 2 11 Returning Parallel Systems to Normal LEGEND Module Operation End Continuous Tie SS Static Bypass Switch 33 Operating Instructions Figure 12 Transfer both load feeders to one UPS FROM TO Normal Operation Combined Loads Operation System 1 System 2 System 1 System 2 M SS SS M M M Momentary Tie Tie Open 4 gt for transfer of Tie Closed Tie i Load 2 to Load1 Load2 System 1 Load1 Load2 See 4 2 4 Isolating a UPS System for Maintenance LEGEND Module Combined Loads Operation 55 7 Static Bypass Switch Figure 13 Both feeders on one system to normal operation FROM TO Combined Loads Operation Normal Operation System 1 System 2 System 1 System 2 M M M 55 55 x ur Tie Closed Tie open lt gt Load1 Load 2 Load1 Load 2 1 2 See 4 2 6 Returning an Isolated Syst
47. on The button s light turns off to provide a visual indication of the operator s intention to separate the sys tems The SYNCHRONIZE SYSTEMS button toggles between indicating the intention to parallel or separate the two UPS systems Verifying Capacity The Power Tie logic checks the UPS systems and their loads to verify both systems have sufficient capacity to maintain their loads once the systems are separated If both UPS systems have sufficient capacity the OK TO OPEN TIE light turns on in the TIE CONTROLS section of the control panel OK to Open Tie After the OK TO OPEN TIE light turns on press the PUSH TO OPEN TIE AFTER OK button The tie breaker trips to separate the two UPS systems Both systems automatically resynchronize to their own bypass source and all control loops between the systems separate Load Transfers Between UPS Systems Functionally load transfers are a continuous tie operation followed by an immediate selective separa tion of the systems The following sequence of operations describes the actions taken to transfer a load between UPS systems Selecting a System for Transfer Select the system you want to receive the load system 1 or system 2 Press the TRANSFER LOAD TO button for system 1 or system 2 on the LOAD TRANSFER CONTROL section of the control panel The system 1 or system 2 light turns on to indicate your selection You can cancel your selection by pressing the system button again The button toggle
48. on Breakers in a sequential make before break manner to permit the uninterrupted transfer of a critical load between two UPS sys tems breakers are operated such that there is an approximate 5 cycle overlap time when the two UPS systems are paralleled prior to one or the other UPS being isolated by its associated Isolation Breaker Or the systems are separated via the Tie Breaker opening when returning a load to its nor mal position Should one system transfer to bypass due to overloads or faults this function can be used to transfer the critical load bus to the second on line system The second system is able to pick up the load from the first system s bypass without having to bypass the second system This transfer operation is identical to the normal internal transfer from UPS to bypass and return an operational sequence that is a reliability cornerstone of the Liebert UPS The difference in this tie function is that the Isolation and Tie breakers replace the functions otherwise performed by the Sys tem Bypass Breaker SBB and UPS Output Breaker devices System Description The Tie Control Unit also contains interlock and monitoring circuitry necessary to assure successful transfers of load between UPS systems These consist of the following 1 Sync Verification circuitry similar to the circuitry employed in each UPS provides the sync check function in two independent modes a Phase Difference detection for
49. on specific integrated circuits with millions of field proven trouble free operating hours and provide rock solid UPS load sharing and synchronization control under dynamic load conditions Digital Phase Lock of Uninterruptible Power Module UPM Inverters Parallel module inverters are all tightly phase locked together by redundant digital oscillators No master oscillator is required This feature coupled with closely matched module output impedances provides the primary module to module load sharing function to approximately 10 This degree of load sharing is good enough under emergency conditions to provide acceptable operation for system load sharing and transfer operations System Output Voltage Control A separate independent and isolated system control function for output voltage which also makes a secondary contribution to the load share function of an additional 3 Module Load Sharing An additional separate independent secondary control function contributes another 3 of inter module load sharing These three independent control functions are additive in contribution to the module load share function and provide an additional level of redundancy to this function without simply duplicating a circuit In combination these three control functions provide module load sharing to better than 596 system will continue to operate acceptably well with the loss of one or more of these control functions
50. on the system Isolation and Fault Tolerance See Figures 6 and 7 Signal isolation prevents an internal failure from propagating between systems By using fiber optics optical isolators and isolation amplifiers we isolate all control signals between each UPS system and the Power Tie Controls To parallel systems requires some amount of intersystem information The controls have been designed to be as fault tolerant as possible We use a parallel module sync bus means because the system will still function if a 60Hz clock in an individual module fails The parallel module sync bus eliminates the need for a system master oscilla tor function In tied systems we use a parallel module sync and fiber optics Fiber optics transport the digital mod ule sync signals between systems to maintain isolation We use fiber optics for these signals since they are the most critical intersystem signals in parallel systems Load Share Signal The Load Share signal is sent between UPS systems when they are in parallel Isolation amplifiers isolate the Load Share signal levels between the systems The load sharing loop and the voltage con trol improves the module load sharing capability of the modules to within 5 of module load Because a Continuous Tie system uses modules of the same kVA kW rating the modules have some inherent capability to share loads due to their similar output impedance Load Share signals are not as critical as module sync signals
51. ransfer options the operator has available based on the current system configuration Transfer Function Available OK to Transfer Load 1 to System 1 This light indicates that the systems are in a configuration where a transfer of load 1 from UPS Sys tem 2 to UPS System 1 can be attempted Transfer Function Available OK to Transfer Load 1 to System 2 This light indicates that the systems are in a configuration where a transfer of load 1 from the UPS System 1 to UPS System 2 can be attempted Transfer Function Available OK to Transfer Load 2 to System 1 This light indicates that the systems are in a configuration where a transfer of load 2 from UPS Sys tem 2 to UPS System 1 can be attempted Transfer Function Available OK to Transfer Load 2 to System 1 This light indicates that the systems are in a configuration where a transfer of load 2 from UPS Sys tem 1 to UPS System 2 can be attempted Transfer Load To System 1 When this button is pressed it initiates a sequence to allow a load transfer to UPS System 1 The transfer to be performed is automatically determined by the current state of the Tie and Load circuit breakers The button turns on indicating that the sequence is armed When the control logic deter mines all conditions for a safe transfer have been met it turns on the appropriate OK TO TRANSFER light Transfer Load To System 2 When this button is pressed it initiates a sequence to allow a load transfer to U
52. rol signals are isolated 30 Operating Instructions 4 2 12 Trouble Recovery While failures are extremely unlikely this system has been designed to allow restart from any system configuration once the fault has been corrected Refer to 1 5 5 Modes of Operation for a descrip tion of the operating modes Isolation for Maintenance See Figure 8 Once the critical loads are transferred to the desired UPS the maintenance bypass circuit breakers and isolation circuit breakers may be operated The details of these isolation maintenance operations are dependent on the specific arrangement of your switchboards Typically to assist maintenance personnel maintenance circuit breaker operation is further guided by an electrical or electromechan 1cal interlock system For detailed instructions for use of the maintenance bypass switchboard refer to the Operation and Maintenance Manual for your Liebert Series 610 UPS 31 Operating Instructions Figure 8 Power Tie system one line diagram W3LSA 3811 DN 83030 3194 UN Dud NDILORTSISIO t 1108181514 0907 79210199 4401 19211182 4901 WLA 01 Gv WILI 01 9 1815 5 111415 91815 48311484 AMBLIVE 38311498 123NND2S1d 123NNB2SId i asi ive INGON 13 1892 IDHINDO 315 5
53. rvis NOILV1OSI 6vrace02u ON Dad 93080 3190 0 2V 134692 1081409 1545 san 2 5 inang 2v anao san 8 3 inant av 31411338 v ayol 19211183 0 19011183 9 15 9 15 1198 1198 133 13514 Conus 518 ying H21IAS Ivas DN San INULLV DSI Nats 315 5 831 01 ADH 17 Operation Description 2 7 Improper User Operation See Figures 4 and 5 The Power Tie Operator controls and logic are designed so that improper opera tor use does not directly cause a loss of critical bus functions Additional security functions such as removable key switches are available as system options Transfer Operation Transfer functions require two push button operations Pushing any single button at random does not put the system at risk The Power Tie system has redundant status sensors and monitors them for proper operation operator should use good judgement when operating the Tie Control The Tie Control cannot pre vent an operator from tying to a source that subsequently goes bad For example assume one UPS has gone to bypass You want to bring the bypass feeder onto the sec ond system The second system must momentarily tie to the first system s bypass source If a bypass fault occurs in the first system during
54. s between select and deselect Synchronizing to the Bypass Source The two UPS systems synchronize to the proper bypass source to perform the selected transfer With the line sync controls tied the Continuous Power Tie logic checks the inter module sync signals for coincidence The Power Tie logic ties the inter module sync signals when coincidence occurs The SYNCHRONIZING light in the CONTROL STATUS section of the MIMIC panel turns on to let the operator know synchronization is still in progress Checking for Phase Voltage and Capacity The Power Tie logic checks these UPS system parameters phase voltage and capacity to determine when they have reached their proper limits The OK TO TRANSFER LOAD TO SYSTEM 9 indi cator turns on in the LOAD TRANSFER CONTROL section of the control panel on when these parameters reach their proper limits Transferring the Load After the OK TO TRANSFER LOAD TO SYSTEM 8 light turns on press the PUSH TO TRANS FER AFTER OK button The Power Tie logic operates the proper circuit breakers in a make before break manner to transfer the load Once the transfer starts the TRANSFERRING light in the CONTROL STATUS section of the MIMIC panel turns on indicating a transfer in progress With the two UPS systems in parallel the voltage synchronization and power sharing loops become tied Transfer Complete When transfer is complete both systems automatically resynchronize to their own bypass sour
55. the Load 1 circuit breaker Load 2 Circuit Breaker These two lights indicate the OPEN Red light or CLOSED Green light state of the Load 2 circuit breaker 20 Control Panel Description 3 2 Tie Circuit Breaker These two lights indicate the OPEN Red light or CLOSED Green light state of the Tie circuit breaker Load 1 Normal This light indicates that Load 1 is being supplied by UPS System 1 Load 1 supplied by UPS system 1 represents the normal operating mode Load 1 On System 2 This light indicates that Load 1 is being supplied by UPS System 2 through the Tie circuit breaker Load 1 Systems Tied This light indicates that Load 1 is being supplied by both UPS Systems which share the combined loads Load 1 Off This light indicates that Load 1 is isolated from both UPS Systems Load 2 Normal This light indicates that Load 2 18 being supplied by UPS System 2 Load 2 supplied by UPS system 2 represents the normal operating mode Load 2 On System 1 This light indicates that Load 2 is being supplied by UPS System 1 through the Tie circuit breaker Load 2 Systems Tied This light indicates that Load 2 is being supplied by both UPS Systems which share the combined loads Load 2 Off This light indicates that Load 2 is isolated from both UPS Systems Control Status Synchronizing This light indicates that the UPS Systems are currently synchronizing to the selected bypass line Control Status
56. the tie operation both load feeders could fault To prevent this type of fault put the first system s bypass source on a standby engine generator Tie Operation The tie process only requires selection of the desired Primary Bypass Source which may be left in a default desired position and the sequential pushing of two buttons The Power Tie logic takes care of synchronizing to the select Primary Bypass Source checking that the systems are in an acceptable configuration verifying that electrical parameters are within tolerance and verifying sufficient com bined systems capacity The sequential operation serves both to eliminate accidental operation and allows the operator an opportunity to cancel an undesired action Before a transfer or tie operation can be performed the Power Tie control turns on an OK indicator The OK indicator clearly describes the action which will occur If the action indicated is not the desired action the operator simply presses the button he used to ini tiate the original operation and the operation is canceled Directions on how to use the Push Again to Cancel feature are posted on the Power Tie control panel next to each applicable push button 18 Operation Description 2 8 2 8 1 2 8 2 2 8 3 2 9 Tie Circuit Breaker or Logic Faults The Continuous Power Tie system has been designed to anticipate circuit breaker and logic faults Should a circuit breaker or logic fault occur the
57. to begin an improper transfer The source feeding the UPS modules does not matter because the UPS inverter output is isolated from the rectifier The logic permits transfers to and from a UPS system with the UPS modules running on Utility Bat tery or Engine generator so long as the system accepting the load 1s running on inverter output Synchronization is verified by forcing the system to meet three independent criteria First all on line module oscillators must be synchronized Second the voltage zero crossings must be within tolerance Third the instantaneous voltage differential between UPS system voltages must be within tolerance But regardless of synchronization status a critical load will not be allowed to transfer to a system running on its bypass source Transfers from a bypass source to a system on UPS is permitted Circuit Breaker Failure If a Close or Open command to a circuit breaker fails to return a confirmation of completion within an acceptable time period the Power Tie logic initiates corrective actions based on the system s initial state and current state Loss of Tie Controls Should a failure occur while the UPS systems are tied the Loads will be transferred to the selected Primary Bypass And the Load breaker to the other UPS system will be opened to prevent backfeed from the Primary Bypass A failure in the Tie controls while the systems are separated has no effect on either UPS system since all cont
58. to carry the transfer load Press the TRANSFER LOAD TO SYSTEM 8 button If you want to transfer Load 2 to System 1 press the SYSTEM 1 button Both systems synchronize to the bypass of the system receiving the additional load The SYNCHRONIZING light in the CONTROL STATUS section of the mimic turns on while the systems are synchronizing The light turns off when the sync lines bypass and oscillator are in the proper state At this point the OK TO TRANSFER LOAD TO SYSTEM 8 light should turn on if there are no inhibits If Load 2 can be transferred to System 1 the OK TO TRANSFER LOAD 2 TO SYS TEM 1 light turns on NOTE When a transfer sequence is initiated the Tie controls are locked out and the TIE CONTROL DISABLED light turns on After the OK TO TRANSFER LOAD 4 TO SYSTEM 8 light turns on press the PUSH TO TRANSFER AFTER OK button to transfer the load The proper circuit breaker closes and after delay the proper 1solating circuit breaker opens White the systems are tied the Load Sharing and Voltage Adjust Controls will also be tied between the systems The LOAD TRANSFERRING light turns on to tell the operator that a transfer is in progress Once transfer is complete the systems return to their own internal sync the current share and voltage adjust controls separate the TRANSFERRING and TIE CONTROL DISABLED lights turn off The SYSTEM 8 push button light turns off and the NORMAL status light turns on load tra
59. unit components within the cir cuit breaker 19 Control Panel Description 3 0 CoNTROL PANEL DESCRIPTION Refer to Figure 5 3 1 Mimic Panel The Mimic panel consists of the following UPS SYSTEM 1 PRIMARY BYPASS UPS SYSTEM 2 PRIMARY BYPASS UPS SYSTEM 1 ON BYPASS UPS SYSTEM 2 ON BYPASS LOAD 1 CIRCUIT BREAKER LOAD 2 CIRCUIT BREAKER TIE CIRCUIT BREAKER LOAD 1 NORMAL LOAD 1 ON SYSTEM 2 LOAD 1 SYSTEMS TIED LOAD 1 OFF LOAD 2 NORMAL LOAD 2 ON SYSTEM 1 LOAD 2 SYSTEMS TIED LOAD 2 OFF CONTROL STATUS SYNCHRONIZING CONTROL STATUS TRANSFERRING UPS System 1 Primary Bypass This light turns on when UPS System 1 is the selected Primary Bypass When lit the light indicates the UPS Modules of both UPS systems are synchronizing to the bypass of UPS System 1 when sys tems are tied or in the process of transferring load UPS System 2 Primary Bypass This light turns on when UPS System 2 is the selected Primary Bypass When lit the light indicates that the UPS Modules of both UPS systems are synchronizing to the bypass of UPS System 2 when systems are tied or in the process of transferring load UPS System 1 On Bypass This light turns on when UPS System 1 is on Bypass UPS System 2 On Bypass This light turns on when UPS System 2 is on bypass Load 1 Circuit Breaker These two lights indicate the OPEN Red light or CLOSED Green light state of
60. ying the combined loads 25 Operating Instructions 4 2 4 Isolating a UPS System for Maintenance Combined Loads Operation Both Load circuit breakers are initially closed and the Tie circuit breaker initially open The Tie cir cuit breaker is closed if the UPS systems are currently in parallel operation 1 4 Select the UPS system that will carry both loads by pressing the appropriate SYSTEM button in the LOAD TRANSFER CONTROL section of the control panel If System 2 is to be isolated then the press the SYSTEM 1 button Load 2 will be transferred to System 1 Wait for the OK TO TRANSFER LOAD light to turn on If System 2 is to be isolated then the OK TO TRANSFER LOAD 2 TO SYSTEM 1 light should turn on when it is safe to perform the transfer Once the OK indication is received press the PUSH TO TRANSFER AFTER OK button and the transfer wilt be performed If System 2 is to be isolated then the Tie breaker will close Then the Load 2 circuit breaker opens after the overlap period times out The isolated UPS system System 2 can now be safely serviced 4 2 5 Transfer of Load Between Two Systems This procedure may be performed from three initial states 2 Tie circuit breaker 1s open and both load circuit breakers are closed Both loads are on System 1 Both loads are on System 2 The UPS system losing the load may be on UPS or Bypass The UPS system accepting the load must be on UPS Select the UPS system
61. ystem 1 System 2 M Ge 76 Module returned Tie Closed to service Tig Load 1 Load2 See 4 2 4 Isolating a UPS System for Maintenance Combined Loads Operation TO Continuous Tied Systems System 1 System 2 MX Ce Sie Continuous Tie operation for Tie Closed module out of Tie service Load1 Load2 LEGEND My Module 55 Static Bypass Switch TO Normal Operation System 1 System 2 M 55 55 C lt gt Load1 Load 2 LEGEND M Module SS Static Bypass Switch TO Combined Loads Operation System 1 System 2 M M Tie Closed Load1 Load 2 LEGEND M Module SS Static Bypass Switch 35 Operating Instructions Figure 18 Load on one system to Continuous Tie FROM TO Combined Loads Operation Continuous Tied Systems System 1 System 2 System 1 System 2 M M Momentary Tie C C for transfer of Tie Closed Tie Closed i Tie Load 2 to System 1 Load1 Load2 Load1 Load2 See 4 2 11 Tying the UPS Systems Continuous LEGEND Module Parallel Operations SS Static Bypass Switch
62. ystem 2 System 1 System 2 M 55 X X M M Momentary Tie G Tie open gt for transfer of Tie Closed Load 2 to Tie Load1 Load2 System 1 Load1 Load2 TO Continuous Tied Systems System 1 System 2 Partial or M full capacity Tie Closed Tie LEGEND Module Load1 Load2 55 Static Bypass Switch Combined loads on one system See 4 2 4 Isolating a UPS System for Maintenance Combined Loads Operation restart bypass system Then use Continuous Tie procedures Tying the UPS Systems Continuous Parallel Operations in Section 4 2 11 Restart one system then refer to Figure 20 Or restart both systems then refer to Figure 15 37 Operating Instructions 38 2 Liebert POWER AVAILABILITY CoNTINUOUS POWER TIE CONFIGURATION UsER MANUAL The Company Behind the Products With over a million installations around the globe Liebert is the world leader in computer protection systems Since its founding in 1965 Liebert has developed a complete range of support and protection systems for sensitive electronics 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 e Integrated systems that provide both environment
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