Liebert Series 610 user manual Separating Tied Systems, Load Transfers Between UPS Systems

Page 17

Operation Description

2.2Separating 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 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.

2.3Load 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 toggles 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 (#) 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 (#) 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 source; and all control loops between the systems separate.

13

Page 16 Page 18
Image 17
Page 16 Page 18
Contents Continuous POWER-TIE Configuration Page Table of Contents Initial System Start-Up 4.2 Basic Operation Operating InstructionsInter-System Isolation and Reliability FunctionSystem Flexibility 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 Transfer Controls Momentary Tie OperationIntersystem Synchronizing 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 SystemsDesign Criteria Combined Loads on One System from Continuous Tie OperationCombined Loads on One System to Continuous Tie Operation Line Sync Signal Power-Tie system fault isolation issues Power-Tie systems fault tolerance Tie Operation Improper User OperationTransfer 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 FailureTying the UPS Systems Continuous Parallel Operations Normal Operating ConfigurationContinuous Tie-Systems Abnormal Operations Isolation for Maintenance Power-Tie system one-line diagram Operation Scenarios/Transfer Procedures See 4.2.5 Transfer of Load Between Two Systems See 4.2.4 Isolating a UPS System for MaintenanceCombined Loads Operation 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 Locations Technical Support/ServiceCompany Behind the Products
Top Page Image Contents