Emerson 250-400kVA manual Load Transfer Procedures, Re-Transfer Procedure

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Operation

2.4.2Load Transfer Procedures

Changing the load from the UPS system to the UPS bypass is called a transfer. Changing the load from UPS bypass to the UPS system is called a retransfer. Note that the UPS system control logic can initiate automatic load transfers and retransfers. Refer to 2.6 - Automatic Operations.

Transfer Procedure

1.Press the “Transfer” menu button on the touchscreen.

2.The Transfer/Retransfer screen will appear in the multipurpose window (see Figure 18).

3.If the UPS output is with synchronization with the bypass, press the “Bypass” button. This will transfer the load from UPS to Bypass.

Re-Transfer Procedure

1.Press the “Transfer” menu button on the touchscreen.

2.The Transfer/Retransfer screen will appear in the multipurpose window (see Figure 18).

3.If the UPS output is with synchronization with the bypass, press the “UPS” button. This will transfer the load from Bypass to UPS.

2.4.3Maintenance Bypass Load Transfers

To manually transfer the load between Maintenance Bypass and the UPS bypass line, carefully follow these instructions. Do not transfer the load between Maintenance Bypass and the UPS module (inverter) output. Use the Monitor/Mimic Display screen to verify the UPS bypass line is available.

Figure 31 UPS with two-breaker bypass cabinet

Two Breaker Maintenance Bypass Cabinet

MBB

MBFB

MIB

Critical

Load

BIB

RIB

Main Input Switchgear

UPS Module

BFB
	DC Bus
CB1	CB2
Battery
System	MBD

NOTICE

Risk of equipment damage. Failing to follow the proper operating sequence when operating any circuit breaker may cause damage to the connected equipment. Operating a Maintenance Bypass circuit breaker out of sequence could cut off power to the critical load.

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Contents Liebert NXL Battery Cabinet Precautions Contacting Liebert for SupportTable of Contents Specifications Figures Page Important Safety Instructions Modes of Operation Normal ModeGeneral Description Bypass Mode Battery ModeMaintenance Bypass OptionsIntroduction Features Main component locationsMimic display Monitor/mimic display example Normal power flow Monitor/mimic display example Utility failMonitor/mimic display example Load on bypass, UPS On Touchscreen Navigation Main Display Screen Menu treeConfigurations Menu Rating Rating ParametersUser Settings System Settings parametersAdjustable Setpoints Adjustable setpoints parametersCell Count Adjustment Startup Menu Event ManagementStatus Reports Menu Shutdown Menu Shutdown menuTransfer/retransfer commands Transfer MenuBattery Management Menu Time remaining displayDisplay summary see Figure Reset MeteringHelp SilenceOK to Transfer Load on bypass, UPS availableInput Power Failure-Load on Battery Input power fail, load on batteryOff Battery Emergency Module OffManual Procedures Remote Emergency Power OffStartup Procedure Startup commands Load Transfer Procedures Transfer ProcedureRe-Transfer Procedure Maintenance Bypass Load TransfersMaintenance Bypass Load Transfers-If Load is on UPS Bypass Shutdown Procedures UPS Shutdown ProcedureSystem Shutdown Procedure Automatic OperationsAutomatic Transfers to Bypass Overload Condition Current-versus-time curves of overload capacityAutomatic Transfers to Bypass, UPS System Faults Automatic Retransfers to UPSSafety Precautions Liebert Services Routine MaintenanceRecord Log Air FiltersBattery Maintenance UPS component service lifeLimited Life Components Component Expected Life ReplaceBattery Safety Precautions Battery retorque values Matching Battery Cabinets-OptionalBattery voltage, nominal and float Torque specifications, unless otherwise labeled Detecting TroubleRack-Mounted Batteries Torque RequirementsCorrective Actions Reporting a ProblemUpstream Feeder Circuit Breaker Setting Inspections Battery Operation Environmental specificationsParameter Specification Environmental ConditionsElectrical specifications Battery & DC ParametersLiebert NXL Model Size 250 Input ParametersPhysical Parameters & Standards, in mm Liebert NXL Model SizeSystem Parameter Specifications Liebert NXL alarm and status messages Event Message Event Definition Recommended ActionObserve the One-Line Display. If the input line is Observe the One-Line Display. To identify which Do not Attempt to Close CB3 Until Reset Displayed on the Module Output Meter. If UPS controls monitor the DC Bus positive Resolve the issue that precipitated the EPO Check the One-Line Display for system status UPS, to transfer back to Inverter If this alarm occurs on an operational unit, it Attempt to manually close the disconnect by Module Output Meter. If the load is less than Output Power Factor. If the displayed power factor Until a service visit has been made and action taken When manual transfers are enabled Under normal conditions, no user action is required Observe the One-Line Display and the Active Event If the command to terminate Regeneration Mode If the alarm cannot be reset, or if the alarm condition UPS Alarm and Status Messages UPS Alarm and Status Messages Page Ne t ItiTi n That