Liebert Series 610 user manual Modes of Operation

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System Description

1.5.5Modes 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 and the tie breaker is open. Each inverter is synchronized to its respective bypass source. Each load is supplied by its inverter(s), with its bypass available as an alternate source.

2.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.

3.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.

4.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 operational mode, one of the two UPSs could be shut down and isolated at this point as well.

5.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 ATS) may be isolated from one or both UPSs for maintenance.

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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 Checking for Phase, Voltage, and Capacity Continuous Power-TieSelecting a Line Sync Source Synchronizing the UPS SystemsControl 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 What Happens If a Failure Occurs During a Power Transfer Tie Circuit Breaker or Logic FaultsRecommendations Tie Circuit Breaker Selection Hardware FailuresMimic Panel Load Transfer Controls Transfer Function Available Transfer Control DisabledTransfer Function Available OK to Transfer Load 1 to System Transfer Function Available OK to Transfer Load 2 to SystemControl Inhibits Continuous Tie ControlManual Controls Maintenance Procedures Isolating Each UPS System Normal Transfer Operation ConfigurationsInitial System Start-Up Basic OperationTransfer of Load Between Two Systems Maintenance Procedures Tie Control Logic Components Maintenance Procedures Maintaining Power-Tie ComponentsAbnormal Operations Trouble RecoveryImproper Transfer Circuit Breaker FailureContinuous 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