Emerson 250-400kVA manual Introduction

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Introduction

•Load Bus Synchronization—The Load Bus Sync (LBS) option keeps two independent UPS sys- tems (and therefore their critical load buses) in sync, even when the modules are operating on bat- teries or asynchronous AC sources. This means that critical loads connected to both load buses can switch seamlessly between the two.

•Customer Alarm Interface—This optional interface board allows the input and display of eight alarms from customer-supplied contacts, each with a customer-selected name of up to 19 charac- ters. The following attributes can be programmed for each alarm: latching, audible, event log and time delay (0 to 99.9 seconds).

•Temperature-CompensatedCharging—When the battery temperature exceeds a preset limit (typically 77°F [25°C]), this optional circuit proportionally reduces float charging voltage to pre- vent overcharging the battery.

•Battery Load Testing—When activated, this option forces the battery string to assume the load for a short period of time. The UPS then compares the test results to data collected during the UPS commissioning to see if the battery system appears to meet specifications.

The Liebert NXL will display status events for Battery Equalize, Battery Self-Test and Battery Com- missioning when those options are active.

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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