Liebert Series 610 user manual Line Sync Signal

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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.

All 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.

All necessary voltage sensing occurs at the tie cabinet and employs fuse, transformer and/or imped- ance protection.

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Contents Continuous POWER-TIE Configuration Page Table of Contents Initial System Start-Up 4.2 Basic Operation Operating InstructionsSystem Flexibility FunctionInter-System Isolation and Reliability Basic Dual-Bus Power-Tie one-line diagram Power-Tie systems fault isolation issues Power-Tie systems control interface diagram Operational Description Control System FeaturesIntersystem Synchronizing Momentary Tie OperationMomentary Tie Transfer Controls Continuous Tie Intersystem Sync and Power SharingTie System Components Continuous Tie/Transfer/Parallel ControlModes of Operation Power-Tie system one-line diagram Synchronizing the UPS Systems Continuous Power-TieChecking for Phase, Voltage, and Capacity Selecting a Line Sync Source Control panel layout Load Transfers Between UPS Systems Separating Tied SystemsCombined Loads on One System to Continuous Tie Operation Combined Loads on One System from Continuous Tie OperationDesign Criteria Line Sync Signal Power-Tie system fault isolation issues Power-Tie systems fault tolerance Transfer Operation Improper User OperationTie Operation Hardware Failures Tie Circuit Breaker or Logic FaultsWhat Happens If a Failure Occurs During a Power Transfer Recommendations Tie Circuit Breaker SelectionMimic Panel Load Transfer Controls Transfer Function Available OK to Transfer Load 2 to System Transfer Control DisabledTransfer Function Available Transfer Function Available OK to Transfer Load 1 to SystemControl Inhibits Continuous Tie ControlManual Controls Basic Operation Normal Transfer Operation ConfigurationsMaintenance Procedures Isolating Each UPS System Initial System Start-UpTransfer of Load Between Two Systems Maintenance Procedures Tie Control Logic Components Maintenance Procedures Maintaining Power-Tie ComponentsCircuit Breaker Failure Trouble RecoveryAbnormal Operations Improper TransferContinuous Tie-Systems Normal Operating ConfigurationTying the UPS Systems Continuous Parallel Operations Abnormal Operations Isolation for Maintenance Power-Tie system one-line diagram Operation Scenarios/Transfer Procedures Combined Loads Operation See 4.2.4 Isolating a UPS System for MaintenanceSee 4.2.5 Transfer of Load Between Two Systems Parallel Operations See 4.2.11 Tying the UPS Systems ContinuousUPS System See 4.2.3 Maintenance Procedures Isolating EachOne system in bypass to Continuous Tie operation Option Operating Instructions Page Company Behind the Products Technical Support/ServiceLocations