Emerson 250-400kVA manual Shutdown Procedures, UPS Shutdown Procedure, System Shutdown Procedure

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Operation

2.5Shutdown Procedures

2.5.1Module Shutdown Procedure

Perform a Module Shutdown Procedure when you want to remove power from a UPS module.

Read all warnings in 3.0 - Maintenance before performing any maintenance on your Liebert NXL UPS. These warnings and cautions must be observed during any work on the UPS.

NOTE

Service and maintenance work must be performed only by properly trained and qualified personnel and in accordance with applicable regulations as well as with manufacturers’ specifications.

Use the module Monitor/Mimic Display to determine the operating condition of the UPS module.

UPS Shutdown Procedure

NOTE

This shutdown turns Off the inverter and the rectifier and trips all battery breakers. Transfers to bypass if available

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

The Shutdown screen will appear in the multipurpose window (see Figure 15).

2.Press the “UPS” button. This brings up a warning dialog box (see Figure 16).

3.Press OK to shut down the UPS

System Shutdown Procedure

NOTE

This shutdown turns Off the inverter and the rectifier and trips all battery breakers. Will shut down UPS completely.

1.Press the “Shutdown” menu button on the display touchscreen.

The Shutdown screen will appear in the multipurpose window (see Figure 15).

2.Press the “System” button. This brings up a warning dialog box (see Figure 17).

3.Press OK to shut down the system.

2.6Automatic Operations

The Liebert NXL UPS system is designed to function while unattended by an operator. The system control logic monitors the performance of the UPS, the availability of power sources and the current required by the critical load.

The system control logic:

Determines what overload conditions can be sustained without a transfer to bypass.

Initiates an automatic transfer to bypass to sustain an overload or when selected UPS faults occur.

Can initiate an automatic retransfer to the UPS after an overload has been cleared.

Initiates an automatic transfer to bypass and emergency module shutdown when specified UPS faults occur.

2.6.1Overloads (Without Transfer)

The UPS system is capable of sustaining full output voltage (±2% of the nominal voltage) for overload conditions that remain within (under) the current versus time curve of overload capacity (Figure 32). Note that the time scale is not linear.

For high current demands of short duration (momentary overloads) the critical load is supplied simul- taneously by both the UPS system and the bypass line. Whenever an overload condition occurs, you should determine the cause of the overload. If an overload condition exceeds the overload capacity, the UPS system initiates an automatic load transfer to the bypass line.

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Contents Liebert NXL Battery Cabinet Precautions Contacting Liebert for SupportTable of Contents Specifications Figures Page Important Safety Instructions General Description Normal ModeModes of Operation Maintenance Bypass Bypass ModeBattery Mode 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 Status Reports Menu Event ManagementStartup Menu Shutdown Menu Shutdown menuTransfer/retransfer commands Transfer MenuBattery Management Menu Time remaining displayDisplay summary see Figure Help ResetMetering 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 Re-Transfer Procedure Load Transfer ProceduresTransfer Procedure Maintenance Bypass Load TransfersMaintenance Bypass Load Transfers-If Load is on UPS Bypass System Shutdown Procedure Shutdown ProceduresUPS 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 FiltersLimited Life Components Battery MaintenanceUPS component service life Component Expected Life ReplaceBattery Safety Precautions Battery voltage, nominal and float Matching Battery Cabinets-OptionalBattery retorque values Rack-Mounted Batteries Torque specifications, unless otherwise labeledDetecting Trouble Torque RequirementsUpstream Feeder Circuit Breaker Setting Inspections Reporting a ProblemCorrective Actions Parameter Specification Battery OperationEnvironmental specifications Environmental ConditionsLiebert NXL Model Size 250 Electrical specificationsBattery & DC Parameters Input ParametersSystem Parameter Liebert NXL Model SizePhysical Parameters & Standards, in mm 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 Ti n Ne tIti That