Emerson Series 610 manual Static Switch Isolation, Pulsed Parallel Operation, Load Transfers

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Theory of Operation

Static Switch Isolation

The motor-operated system bypass circuit breaker (SBB), wired in parallel with the static switch, automatically closes in approximately 200 milliseconds after the load is transferred to the bypass power source, removing the static switch from the power flow.

Also, if required for maintenance, the static switch can be isolated from the bypass line by opening (to the OFF position) the Static Switch Disconnects. For maintenance, this should only be done with the UPS system critical load on bypass power.

Pulsed Parallel Operation

When an overload condition such as magnetic inrush current or a branch load circuit fault exceeds the overload capacity of the connected modules, the static bypass switch pulses on for 40 milliseconds. This allows up to 1000% of the rated full load current from the bypass line to clear the overload with- out closing the bypass circuit breaker. The bypass source is briefly in parallel with the UPS system, permitting the bypass source to carry the initial overload current. If the overload clears before 40 mil- liseconds, a load transfer to bypass is not made. If the overload condition continues, the automatic transfer is made (maintaining the load voltage within the specified limits).

This pulsed static switch operation reduces nuisance operation of motor-operated circuit breakers for such short-term conditions and serves, under some circumstances, as a backup in the event that an external bypass feeder breaker trips open during this pulse-paralleling period.

Load Transfers

Transfers to (transfer) or from (retransfer) the bypass may be performed automatically or manually in

amake-before-break sequence. This is accomplished through the overlapping operation of the UPS output and the system bypass power switching devices.

Manual load transfers and retransfers are initiated by the operator from the System Control Cabinet (SCC).

In a manual operation or an automatic retransfer, the two motorized circuit breakers—UPS output and system bypass—are both closed simultaneously for a short period of time (overlap).Should the overlap period exceed the design limits, the condition is alarmed and protective action is initiated.

Automatic transfers are initiated by the SCC system control logic when an overload is beyond the specified capabilities of the UPS system or when a fault occurs within a non-redundant UPS module. An automatic retransfer is initiated if this function is enabled and if system conditions for a retrans- fer are present.

In an automatic transfer, the circuit breakers do not overlap, but, during the short time gap, bypass power is supplied to the critical load through the solid state static switch. In an SCCC control cabinet with a continuous duty static switch, if for some reason the Static Bypass Breaker (SBB) fails to close, the static switch will carry the load continuously.

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Contents Liebert Series 610 UPS Battery Cabinet Precautions Table of Contents Specifications MaintenanceFigures Tables Important Safety Instructions Multi-Module UPS, 100-500kVA System DescriptionMulti-Module UPS, 500-750kVA Designed for Success ReliabilityTypes of System Control Cabinets SCCs Other Factors to Consider Safety PrecautionsInput Power Failure Modes of OperationOperator Controls 1989-2003 Options BatteryTwo Breaker Maintenance Bypass Battery Racks or CabinetsModule Battery Disconnect Three Breaker Maintenance BypassSystem Control Cabinet General Component DescriptionsUPS Module Battery PlantSoftware Detailed Component DescriptionsControls Hardware Input Circuit Breaker Input Power FactorRectifier/Charger OperationBattery Equalize Charge Circuit Battery Charging CircuitBattery Disconnect Battery Charge Current LimitingOutput Regulation and Overload Performance Non-Linear Load CharacteristicsUnbalanced Load Characteristics InverterShorted SCR Monitoring Static BypassFuse Protection Load Transfers Static Switch IsolationPulsed Parallel Operation Transfer and Retransfer Conditions Retransfer Inhibited Redundant ModeDisplay Screen and Operator Controls FeaturesDescription Function 500kVA1000kVA Operation Description Location Function Refer to 3.4.5 Shutdown ProceduresNumbers are used as keys to data in , below Switches behind SCC control panel door Menu tree Menu Tree NavigationModule Master Menu Master Menu ScreenSCC Master Menu Operation Output Metering Displays SCC Monitor/Mimic Display ScreenInput Metering Displays Item 6 System Status Messages Status/Alarm Message AreasItem 7 Alarm Messages Item 5 Module Status MessagesModule Monitor/Mimic display screen Module Monitor/Mimic Display ScreenItem 5 Alarm Messages Alarm MessagesModule Display SCC 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 during start-up Walk-In Display ScreenPresent Status Status Reports ScreensModule Status Report Event HistorySCC Status Report History status report screens History StatusAlarm in SCC Alarm in Module Alarm conditions that freeze history data gatheringSystem Status Battery Cycle Monitor-Module OnlyBattery cycle monitoring summary screen SCC system configuration screen System Configuration ScreensDate screen DateTime screen TimeAuto Dial Auto dial setting screenMaximum Auto-Retransfer Attempts Modem Baud RateRetransfer Attempts System Current RatingLanguage Selection System OptionsContinuous Duty Static Switch Optional Battery test screen-MMU onlySCC and module remote monitor indications Remote MonitorModule alarm limit settings screen Alarm Limit Settings ScreenTemperature Limit Setting Optional Battery Float VoltageRefer to 3.4.3 Load Transfer Procedures for more details Load Transfer Procedures ScreenRefer to 3.4.1 SCC Start-Up Procedure for more details Start-Up Procedures ScreenModule start- up procedures screens Shutdown Procedures ScreenSCC shutdown procedures screen Battery time screen 15 minute discharge Battery Time Screen Module OnlyElapsed Time Minutes Upper Limit Actual Lower LimitOperation Meter calibration screen Meter Calibration ScreenBattery equalize screen Battery Equalize ScreenSystem Status Messages Alarm and Status Messages Module Status MessagesAbbreviation Definition Abbreviations used in alarm messagesLoad Block Messages Alarm messages meaning and corrective action Control Power Manual ResetStatic Switch Bypass PhaseModule N Off Reverse PowerInverter Fault TransferNew Alarm Battery OvertempOvertemperature TimeoutSpecial Functions Alarm messages summaryAlarm Message Requesting Information Communication InterfacesWorldwide Reporting Auto-DialSite Reporting SiteScan or Snmp Local Reporting to a TerminalLocal Reporting to a Monitor Separate / Simultaneous Outputs Liebert Series 610 terminal commandsRemote Monitor Panel Circuit breaker abbreviations Abbreviation Circuit Breaker OK to Transfer Load on BypassLoad on bypass, UPS available Momentary Overloads Momentary overload, pulsed static bypass switchInput power fail-load on battery Input Power Failure-Load on BatteryOne module off-line, load on UPS One Module Off-LineLoad on UPS-battery not available Off BatteryEmergency Modules Off Refer to 3.4.5 Shutdown ProceduresEmergency power off Remote Emergency Power OffSystem Shutdown Refer to 3.3.10 Maintenance BypassLoad on maintenance bypass, two breakers Refer to 3.5 Automatic Operations for more details Manual ProceduresSCC Start-Up Procedure Operation Operation SCC start-up procedures screen UPS Module Start-Up Module start-up procedures screen Operation Manual Transfer Instructions UPS Lead Load Transfer ProceduresIf the load is on the UPS System Bypass Maintenance Bypass Load TransfersIf the load is on Maintenance Bypass Shutdown Procedures System Shutdown Procedure Module Shutdown Procedure Local Emergency Modules Off Lemo Remote Emergency Power Off RepoAutomatic Operations 150% Overloads Without TransferAutomatic Transfers to Bypass 1000%Automatic Emergency Modules Off Automatic Retransfers to UPSAutomatic Module Off-Line Maintenance Training Liebert Global ServicesMaintenance Agreements The Signature Program Professional Start-UpAir Filters Routine MaintenanceRecord Log Limited Life Components Battery Safety Precautions Battery MaintenanceAvertissement Number of Cells Battery Voltage VDC Nominal Float Matching Battery Cabinets OptionalRack-Mounted Batteries Battery retorque valuesBattery voltage record Torque Requirements Torque specifications unless otherwise labeledDetection of Trouble Recommended Test Equipment Reporting a ProblemUpstream Feeder Circuit Breaker Setting Inspections Corrective ActionsKVA Power factor pf KVARating Environmental Conditions Specifications applicable to environmentBattery Operation AdjustmentsElectrical Specifications Specifications 112 Page Locations
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Series 610 specifications

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