Liebert Series 610 user manual Continuous Tie-Systems, Normal Operating Configuration

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Operating Instructions

4.2.11Continuous 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. When 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 SYS1 position.

2.Press the 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 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.Once the 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.

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Contents Continuous POWER-TIE Configuration Page Table of Contents Initial System Start-Up 4.2 Basic Operation Operating InstructionsFunction System FlexibilityInter-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 FeaturesMomentary Tie Operation Intersystem SynchronizingMomentary 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 from Continuous Tie Operation Combined Loads on One System to Continuous Tie OperationDesign Criteria Line Sync Signal Power-Tie system fault isolation issues Power-Tie systems fault tolerance Improper User Operation Transfer 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 FailureNormal Operating Configuration Continuous Tie-SystemsTying the UPS Systems Continuous Parallel Operations Abnormal Operations Isolation for Maintenance Power-Tie system one-line diagram Operation Scenarios/Transfer Procedures See 4.2.4 Isolating a UPS System for Maintenance Combined Loads OperationSee 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 Technical Support/Service Company Behind the ProductsLocations
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