Emerson Series 610 manual Transfer and Retransfer Conditions

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Theory of Operation

Transfer and Retransfer Conditions

1.Automatic Transfers to Bypass

Critical bus conditions that will initiate an automatic transfer of the critical load from the UPS system to the bypass source are:

a.System Overload: overcurrent condition in excess of the overload rating of the System Control Cabinet (SCC).

b.Output Overload: overcurrent condition in excess of the current-versus-time overload capacity of UPS modules ON LINE.

c.Overvoltage/Undervoltage (OV/UV): critical bus voltage is outside the allowable tolerance.

d.Non-redundant UPS Module Inoperative: an essential UPS module is taken OFF LINE for one of the reasons below.

1.Battery discharged to the shutdown voltage.

2.Inverter overload capacity exceeded.

3.Inverter or rectifier fault condition (power, logic or overtemperature) present or imminent.

4.Failure of UPS module logic or logic power.

e.SCC Logic:

1.Emergency Module Off (EMO) circuit activated.

2.Failure of UPS system logic or logic power.

2.Manual Transfers

Manual transfers may be initiated at any time provided no transfer inhibition conditions are present.

3.Transfer Inhibited

A manual transfer to the bypass source will be inhibited if any of the following conditions exist:

a.UPS system to bypass voltage difference (ΔV) exceeds a predetermined percentage (normally 5%).

b.Static switch disconnects open.

c.OK to Transfer signal from the control logic is not present.

NOTE

A load transfer to the bypass line will be completed whenever an automatic transfer to bypass is initiated. If the Static Switch Unable alarm message is present for any reason (including a ±20° phase lock synchronization error), the automatic transfer will be interrupted for

40-120 milliseconds. Because of the reliability of the UPS components, an interrupted load transfer is a very unlikely occurrence.

4.Automatic Retransfers to UPS

Critical bus conditions that must be present to initiate an automatic retransfer (Auto-Rexfer) of the critical load from the bypass source to the UPS system are:

a.The number of Auto-Rexfer Attempts selected must be greater than zero (0). If zero (0) is selected, no automatic retransfer will occur.

b.Critical load was initially transferred to the bypass source due to a system overload only.

c.Overload has since dropped below 100% of the rated SCC current.

d.Enough UPS modules are ON LINE to supply the critical load.

e.OK to Transfer signal received from the control logic for at least 10 seconds, within 5 minutes of the overload transfer. (A manually initiated retransfer from bypass is required for overloads lasting 5 minutes or more.)

f.Cyclic-type system overloads, which occur up to five (select range is 0 to 5) times in

60 minutes, are automatically returned to the UPS system for each event including the Nth overload. A manually initiated retransfer from bypass is required for the N+1 overload.

5.Manual Retransfers

Manual retransfers may be initiated at any time provided no retransfer inhibition conditions are present.

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Contents Liebert Series 610 UPS Battery Cabinet Precautions Table of Contents Maintenance SpecificationsFigures Tables Important Safety Instructions System Description Multi-Module UPS, 100-500kVAMulti-Module UPS, 500-750kVA Reliability Types of System Control Cabinets SCCsDesigned for Success Safety Precautions Input Power FailureModes of Operation Other Factors to ConsiderOperator Controls 1989-2003 Battery OptionsBattery Racks or Cabinets Module Battery DisconnectThree Breaker Maintenance Bypass Two Breaker Maintenance BypassGeneral Component Descriptions System Control CabinetBattery Plant UPS ModuleDetailed Component Descriptions Controls HardwareSoftware Input Power Factor Rectifier/ChargerOperation Input Circuit BreakerBattery Charging Circuit Battery DisconnectBattery Charge Current Limiting Battery Equalize Charge CircuitNon-Linear Load Characteristics Unbalanced Load CharacteristicsInverter Output Regulation and Overload PerformanceStatic Bypass Fuse ProtectionShorted SCR Monitoring Static Switch Isolation Pulsed Parallel OperationLoad Transfers Transfer and Retransfer Conditions Redundant Mode Retransfer InhibitedFeatures Display Screen and Operator Controls500kVA 1000kVADescription Function Operation Refer to 3.4.5 Shutdown Procedures Numbers are used as keys to data in , belowDescription Location Function Switches behind SCC control panel door Menu Tree Navigation Menu treeMaster Menu Screen SCC Master MenuModule Master Menu Operation SCC Monitor/Mimic Display Screen Input Metering DisplaysOutput Metering Displays Status/Alarm Message Areas Item 7 Alarm MessagesItem 5 Module Status Messages Item 6 System Status MessagesModule Monitor/Mimic Display Screen Module Monitor/Mimic display screenAlarm Messages Item 5 Alarm MessagesSCC Display Module DisplayMonitor/Mimic display example Utility fail 2700kVAKVA//2170 KWkW 325A0A 325A0A 325A0A Upsinputpwr Battery MOD 1 OFF Line SUM ALM MVODLTS2 OFF540 Line SUM ALM Walk-In Display Screen Walk-in display screen during start-upStatus Reports Screens Present StatusEvent History SCC Status ReportModule Status Report History Status History status report screensAlarm conditions that freeze history data gathering Alarm in SCC Alarm in ModuleBattery Cycle Monitor-Module Only System StatusBattery cycle monitoring summary screen System Configuration Screens SCC system configuration screenDate Date screenTime Time screenAuto dial setting screen Auto DialModem Baud Rate Maximum Auto-Retransfer AttemptsSystem Current Rating Language SelectionSystem Options Retransfer AttemptsBattery test screen-MMU only Continuous Duty Static Switch OptionalRemote Monitor SCC and module remote monitor indicationsAlarm Limit Settings Screen Module alarm limit settings screenBattery Float Voltage Temperature Limit Setting OptionalLoad Transfer Procedures Screen Refer to 3.4.3 Load Transfer Procedures for more detailsStart-Up Procedures Screen Refer to 3.4.1 SCC Start-Up Procedure for more detailsShutdown Procedures Screen Module start- up procedures screensSCC shutdown procedures screen Battery Time Screen Module Only Battery time screen 15 minute dischargeUpper Limit Actual Lower Limit Elapsed Time MinutesOperation Meter Calibration Screen Meter calibration screenBattery Equalize Screen Battery equalize screenAlarm and Status Messages Module Status Messages System Status MessagesAbbreviations used in alarm messages Load Block MessagesAbbreviation Definition Alarm messages meaning and corrective action Manual Reset Static SwitchBypass Phase Control PowerReverse Power Inverter FaultTransfer Module N OffBattery Overtemp OvertemperatureTimeout New AlarmAlarm messages summary Alarm MessageSpecial Functions Communication Interfaces Worldwide ReportingAuto-Dial Requesting InformationLocal Reporting to a Terminal Local Reporting to a MonitorSite Reporting SiteScan or Snmp Liebert Series 610 terminal commands Remote Monitor PanelSeparate / Simultaneous Outputs Circuit breaker abbreviations Abbreviation Circuit Breaker Load on Bypass OK to TransferLoad on bypass, UPS available Momentary overload, pulsed static bypass switch Momentary OverloadsInput Power Failure-Load on Battery Input power fail-load on batteryOne Module Off-Line One module off-line, load on UPSOff Battery Load on UPS-battery not availableRefer to 3.4.5 Shutdown Procedures Emergency Modules OffRemote Emergency Power Off Emergency power offRefer to 3.3.10 Maintenance Bypass System ShutdownLoad on maintenance bypass, two breakers Manual Procedures SCC Start-Up ProcedureRefer to 3.5 Automatic Operations for more details Operation Operation SCC start-up procedures screen UPS Module Start-Up Module start-up procedures screen Operation Load Transfer Procedures Manual Transfer Instructions UPS LeadMaintenance Bypass Load Transfers If the load is on Maintenance BypassIf the load is on the UPS System Bypass Shutdown Procedures System Shutdown Procedure Module Shutdown Procedure Remote Emergency Power Off Repo Automatic OperationsLocal Emergency Modules Off Lemo Overloads Without Transfer Automatic Transfers to Bypass1000% 150%Automatic Retransfers to UPS Automatic Module Off-LineAutomatic Emergency Modules Off Maintenance Liebert Global Services Maintenance Agreements The Signature ProgramProfessional Start-Up TrainingRoutine Maintenance Record LogAir Filters Limited Life Components Battery Maintenance Battery Safety PrecautionsAvertissement Matching Battery Cabinets Optional Number of Cells Battery Voltage VDC Nominal FloatBattery retorque values Battery voltage recordRack-Mounted Batteries Torque specifications unless otherwise labeled Detection of TroubleTorque Requirements Reporting a Problem Upstream Feeder Circuit Breaker Setting InspectionsCorrective Actions Recommended Test EquipmentPower factor pf KVA RatingKVA Specifications applicable to environment Environmental ConditionsAdjustments Battery OperationElectrical Specifications Specifications 112 Page Locations
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Series 610 specifications

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