Page 3 - TABLE OF CONTENTS
i TABLE OF CONTENTS 1.0 S YSTEM D ESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1.1 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 ...
Page 4 - PERATING; FIGURES
ii 4.0 O PERATING I NSTRUCTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.1 Initial System Start-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 4.2 Basic Operation . . . . . ...
Page 5 - YSTEM; Function; Figure 1; System Flexibility; ous-tied systems, module kVA and kW ratings must be identical.; Inter-System Isolation and Reliability; ductors are required. See; Figure 2
System Description 1 1.0 S YSTEM D ESCRIPTION 1.1 Function The Liebert Continuous Power-Tie™ 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 ...
Page 8 - Figure 3
System Description 4 Figure 3 Power-Tie systems - control interface diagram
Page 9 - Control System Features; high availability/high reliability performance goals:; Digital Controls; dynamic load conditions.; System Output Voltage Control; Operational Description; See
System Description 5 1.4 Control System Features A 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 configu...
Page 10 - Intersystem Synchronizing; internal bypass sync at the conclusion of the transfer sequence.; Momentary Tie Transfer Controls
System Description 6 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 lo...
Page 11 - Phase Difference inhibits a transfer if limits are exceeded.; Intersystem Sync and Power Sharing; can still be maintained within acceptable limits.
System Description 7 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 funct...
Page 12 - paralleling sequence.; Figure 4; bypass sources in sync is preferable.
System Description 8 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 are synchronizing and when the systems are ready for the manually initiated, automatically...
Page 15 - PERATION; Figure 5; Selecting a Line Sync Source; source for the critical loads.; Synchronizing the UPS Systems; NOTE; on one UPS system while the other was being serviced.
Operation Description 11 2.0 O PERATION D ESCRIPTION There are two types of operations which can be performed with the Liebert Continuous Power-Tie System. • Create a continuous tie between the critical buses of two UPS systems• Transfer of a critical load between two UPS systems 2.1 Continuous Powe...
Page 17 - Separating Tied Systems; separate the two UPS systems.; Load Transfers Between UPS Systems; the operator know synchronization is still in progress.
Operation Description 13 2.2 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 button. The button’s light turns off to provide a visual ...
Page 18 - Combined Loads on One System from Continuous Tie Operation; Isolation and Fault Tolerance; Figures 6; Load Share Signal
Operation Description 14 2.4 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...
Page 19 - Line Sync Signal
Operation Description 15 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 ...
Page 20 - Figure 6
Operation Description 16 Figure 6 Power-Tie system - fault isolation issues
Page 21 - Figure 7
Operation Description 17 Figure 7 Power-Tie systems - fault tolerance
Page 22 - Improper User Operation; Figures 4; and; Transfer Operation
Operation Description 18 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 ...
Page 23 - Tie Circuit Breaker or Logic Faults; under fault conditions; What Happens If a Failure Occurs During a Power Transfer; its initial configuration.; Recommendations - Tie Circuit Breaker Selection
Operation Description 19 2.8 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 Power-Tie system maintains the critical bus function under fault conditions 2.8.1 What...
Page 24 - ONTROL; Mimic Panel
Control Panel Description 20 3.0 C ONTROL P ANEL D ESCRIPTION Refer to Figure 5 . 3.1 Mimic Panel The Mimic panel consists of the following: • UPS SYSTEM 1 - PRIMARY BYPASS• UPS SYSTEM 2 - PRlMARY BYPASS• UPS SYSTEM 1 - ON BYPASS• UPS SYSTEM 2 - ON BYPASS• LOAD 1 CIRCUIT BREAKER• LOAD 2 CIRCUIT BREA...
Page 25 - represents the normal operating mode.; Load Transfer Controls
Control Panel Description 21 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 operatin...
Page 26 - on the current system configuration.
Control Panel Description 22 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 ind...
Page 27 - Continuous Tie Control; tems are in parallel operation.; Control Inhibits; ation of the UPS systems.
Control Panel Description 23 3.3 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 it is safe to tie UPS Systems 1 and 2 together. The systems are tied after the PUSH TO TIE...
Page 28 - ei; Manual Controls; tions they should not need to be used.
Control Panel Description 24 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...
Page 29 - Initial System Start-Up; Description; Basic Operation; Normal Transfer Operation Configurations
Operating Instructions 25 4.0 O PERATING I NSTRUCTIONS Refer to Figure 5 . 4.1 Initial System Start-Up All load circuit breakers and tie circuit breakers are initially open.1. Press the CLOSE LOAD 1 button located on the panel behind the Control door. The Load 1 breaker should close when the button ...
Page 30 - the press the SYSTEM 1 button. Load 2 will be transferred to System 1.; Transfer of Load Between Two Systems; This procedure may be performed from three initial states:; DISABLED light turns on.
Operating Instructions 26 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. Select the UPS s...
Page 31 - System
Operating Instructions 27 4.2.6 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 accep...
Page 32 - Improper Transfer; state and current state.; Loss of Tie Controls; system operating mode once the fault has been corrected. Refer to
Operating Instructions 28 4.2.9 Abnormal Operations Improper Transfer Transfers can not be performed unless the OK TO TRANSFER LOAD (#) TO SYSTEM (#) 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 outp...
Page 33 - ing a critical load on the Bypass source.; Normal Operating Configuration; inverter output. See; Tying the UPS Systems - Continuous Parallel Operations; Both systems will share both critical load feeders.
Operating Instructions 29 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 p...
Page 34 - Maintenance Procedures - Tie Control Logic and Power Components; Abnormal Operations
Operating Instructions 30 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...
Page 35 - Trouble Recovery; configuration once the fault has been corrected. Refer to; Figure 8; Maintenance Manual for your Liebert Series 610 UPS.
Operating Instructions 31 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. 4.2.12 Isolation for Maint...
Page 37 - Figure 9; Operation - End Combined Loads Operation; Returning Parallel Systems to Normal
Operating Instructions 33 4.2.13 Operation Scenarios/Transfer Procedures Refer to the section listed below each figure for the operational procedure to perform the function indicated. Figure 9 From start-up to normal operation, loads to be split between two distribution feeders Figure 10 From combin...
Page 38 - Figure 12 Transfer both load feeders to one UPS; Combined Loads Operation
Operating Instructions 34 Figure 12 Transfer both load feeders to one UPS Figure 13 Both feeders on one system to normal operation Figure 14 Transfer 100% load on one system to 100% load on a second system (a two-step operation) M 1 M 1 SS 1 SS 2 M 2 M 2 System 1 System 2 Load 1 Load 2 Tie FROM: Nor...
Page 39 - Figure 15 Normal split load operations to Continuous Tie; Tying the UPS Systems - Continuous
Operating Instructions 35 Figure 15 Normal split load operations to Continuous Tie Figure 16 Continuous Tie to normal split load operation Figure 17 Continuous Tie to load on one system M 1 M 1 SS 1 SS 2 M 2 M 2 System 1 System 2 Load 1 Load 2 Tie FROM: Normal Operation Tie Open See 4.2.11 - Tying t...
Page 40 - Figure 18 Load on one system to Continuous Tie; UPS System
Operating Instructions 36 Figure 18 Load on one system to Continuous Tie Figure 19 One system in bypass to both feeders combined on remaining operational system See 4.2.11 - Tying the UPS Systems - Continuous Parallel Operations . LEGEND: M x = Module SS x = Static Bypass Switch M 1 M 1 SS 1 SS 2 M ...
Page 44 - OWER; ONTINUOUS; SER
The Company Behind the Products With over a million installations around the globe,Liebert is the world leader in computer protectionsystems. Since its founding in 1965, Liebert hasdeveloped a complete range of support andprotection systems for sensitive electronics: • Environmental systems—close-co...
