Emerson 480V user manual Auto Restart, Emergency Shutdown With EPO

Page 83

Operating Instructions

9.4Auto Restart

When the main and bypass sources fail, the UPS draws power from the battery system to supply the load until the batteries are depleted. When the UPS reaches its end of discharge (EOD) threshold, it will shut down.

The UPS will automatically restart and enable output power:

•after utility power is restored

•if “Auto Recovery after EOD Enabling” is enabled

•after the “Auto Recovery after EOD Delay Time” expires (the default delay is 10 minutes)

During the auto recovery delay, the Liebert NX will be charging its batteries to provide a safety margin for equipment shutdown if input power fails again.

If the “Auto Recovery after EOD Enabling” feature is disabled, the user must restart the system man- ually.

9.5Emergency Shutdown With EPO

This circuit has been designed to switch off the UPS in emergency conditions (i.e., fire, flood, etc.). The system will turn off the rectifier and inverter and will stop powering the load immediately (including the inverter and bypass), and the battery stops charging or discharging. If a Liebert NX battery cabi- net is connected, the circuit breaker in the battery cabinet will shunt trip open.

If input utility power is present, the UPS’s controls will remain active; however, the output will be turned off. To remove all power from the UPS, open the external feeder breaker.

9.6Reset After Shutdown for Emergency Stop (EPO Action) or Other Conditions

Once all appropriate measures have been taken to correct the problem indicated by the alarm mes- sage appearing on the operator control panel display, carry out this procedure to restore the UPS to regular operation following an EPO action or for the following reasons: Inverter Overtemperature, Cut-off Overload, Battery Overvoltage, excessive switching (BYP: XFER COUNT BLOCK), etc.

When the user confirms that the fault is cleared:

1. Press the FAULT CLEAR button to let the system exit the emergency-off state.

NOTE

The rectifier will start again, and the bypass will begin to power the load. The Rectifier indicator flashes while the rectifier is starting up. When the rectifier enters the normal operation state (about 30 seconds), the rectifier indicator turns green.

2.Press the INVERTER ON button on the right side of the operator control panel for longer than 2 seconds.

NOTE

The rectifier will automatically turn on 5 minutes after the Inverter Overtemp alarm has cleared.

After the EPO button is pressed, if the input utility is removed, the UPS will shut down completely. When input utility is returned, if the Bypass input circuit breaker (CB2) and UPS output circuit breaker (CB5) are closed, the UPS will start up on Bypass. There will be power at the output termi- nals of the UPS.

! WARNING

If the internal maintenance bypass circuit breaker (CB3) is closed and input utility is present, there will be power at the output terminals of the UPS.

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Contents Liebert NX UPS Page Table of Contents Operator Control and Display Panel UPS SpecificationsOptions Pop-Up Windows Operating InstructionsAppendix a UPS Status Messages Specifications and Technical DataTables Page Important Safety Instructions Battery Cabinet Precautions Glossary of Symbols External Inspections InstallationUPS Location Internal InspectionsPreliminary Checks Special Considerations for Parallel Systems Battery LocationConsiderations in Moving the Liebert NX Mechanical ConsiderationsSystem Composition Floor InstallationClearances Cable EntryCabinet arrangement-Liebert NX units and battery cabinets UPS Lug Size and Torque Requirements Power CablingCable Rating Cabling Guidelines UPS Input ConfigurationInput and output busbars Cable ConnectionsUPS Rectifier and Bypass Input Supply Safety GroundProtective Devices Dual Input Connections Cabling ProcedureOutput System Connections-Ensure Correct Phase Rotation Common Input ConnectionsControl Cables Frequency Converter ModeMonitor Board Features Dry Contacts Input dry contacts at Maintenance Bypass Cabinet InterfaceMaintenance bypass cabinet interface Input Dry ContactsBCB control interface BCB Control InterfaceOutput dry contact relays Inverter mode relay centerMain input fault relay center Output Dry ContactsIndicates Pin EPO Input-OptionalEPO input contact relays Introduction SafetyBattery Cabinets External Battery Cabinet InstallationInsulated Post Tray Handle For Cabling Connecting the BatteriesInstallation Considerations BCB Shunt Trip Connecting the Battery Cabinet to the UPSNon-Standard Batteries Alber Monitoring System-Optional This power must be UPS protectedLBS Cable LBS Cable and SettingsLoad Bus Synchronization Performance RequirementsGeneral Configuring Parallel System OperationFeatures of Parallel System Operation Modes Summary Installing Parallel SystemOperating Principles Redundancy Paralleling Preliminary Checks Cabinet InstallationPower Cables Conditions for Parallel SystemCables InterconnectingAuxiliary Dry Contact Cables To Load Q1Ext Q2ExtQByp Normally Closed EPO Normally Open EPOConformity and Standards UPS Mechanical CharacteristicsEnvironmental characteristics UPS mechanical characteristicsUPS terminal UPS Electrical CharacteristicsBattery Manufacturer Models Supplied Rectifier input powerLiebert approved replacement batteries Rated Power kVA 100 120Bypass Input DC Intermediate CircuitInverter Output Left Side GND Left Side View Front View Max. Door Swing U3819205 530628 Pg , Rev BattExt Auxiliary Contacts External Battery CabinetBattery Breaker Top Top Front Right Side System Front RearRear FRONTOutput Run From Conductors AC Output Ph A, B, C System InputPh A, B, C UPS Inputs Ph A, B, C UPS OutputsGround UPS Utility UPS #1-UPS #4 Module AC Ph A, B, C UPS InputsPh A, B, C System Outputs U3819301 Isometric ViewGeneral Description Single module block diagram dual input configurationBypass Supplies Normal ModeBattery Mode Bypass ModeParallel Redundancy Mode System Expansion Maintenance ModeDisplay Panel Layout Operator Control PanelDetailed view of control panel Mimic indicators Control buttons Navigation keysMimic display status indicators Mimic Display IndicatorsControl buttons Control ButtonsLCD Overview Audible BuzzerDescription of items in UPS system window Navigation KeysUPS System Information Icons for navigation keysLCD Menus and Data Items Input Descriptions of UPS menus and data window itemsMenu Type Item Type Explanation MainsTests Start/stop BatteryLanguage Selection Set date and time Current Date and TimeCurrent status and history log records UPS Status MessagesOpening Display Default ScreenTypes of LCD Screens Screen Saver Window UPS Help ScreenPop-Up Windows UPS operating modes Liebert NX Operating ModesCircuit breakers Circuit BreakersUPS Startup Startup ProcedureIndicator State Switch from Bypass Mode to Normal Mode Switch from Normal Mode to Bypass ModeMaintenance Bypass Procedure and Powering Down the UPS Emergency Shutdown With EPO Auto RestartBattery End-of-Discharge EOD Protection Battery ProtectionMulti-Module System Procedures Battery Undervoltage Pre-WarningTie breaker LED Function Status Inserting One Module into a Multi-Module SystemCommissioning a Parallel System Shutdown Procedure-Complete UPS and Load ShutdownParallel System Start Up Liebert IntelliSlot Communication Power OutputCommunication and Other User Terminals Analog Input InterfaceBaud Rates See 10.1.5 ConfiguringLiebert NX communication options CommentsConfiguring Baud Rates Liebert IntelliSlot Web card display Pin Function Operation Relay Card pin configurationRelay card jumper configuration Relay CardPin Description MultiPort 4 CardAssignment Replacing Dust Filters Remote Alarm MonitorLBS Mode-Load Bus Synchronization Cable Lengths Floor to Connection Point Inside UPS Torque specificationsBattery torque rating Lug Size and Torque RequirementsParallel system current table Distance to connection points on the Liebert NX UPSLead/Lag ratings External cabinet dimensions, including side panelsCable size and tightening torques 250 10 N*m Estimated battery run time, minutes Battery Run TimesEvent Message Description / Suggested Action if any Services at 800-543-2378 for assistanceUPS status messages Software according to the customer’s agreement High ambient air temperatureBypass voltage is beyond the normal range Bypass voltage exceeds the limitCondition is removed Error can also leads to the alarmAlarm if applicable Inverter STS FailEPO Emergency Power OffUPS status messages UPS Status Messages Page That Ne tIti Ti n
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480V specifications

The Emerson 480V power systems play a critical role in modern industrial applications, providing reliable and efficient power distribution. These systems are designed for facilities that require robust performance and operational efficiency while adhering to safety regulations. With voltage ratings at 480V, they cater primarily to industries such as manufacturing, data centers, and commercial buildings.

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