Emerson 480V user manual Maintenance Bypass Procedure and Powering Down the UPS

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Operating Instructions

9.3Maintenance Bypass Procedure and Powering Down the UPS

Follow the procedure below to transfer the load from the inverter output to the Maintenance Bypass line of the UPS.

! CAUTION

Before performing this operation, read the messages on the LCD to be sure that bypass supply is regular and the inverter is synchronous with it. If those conditions are not present, there is a risk of a short interruption in powering the load.

This procedure assumes that the UPS is operating normally.

1.Press the INVERTER OFF button on the operator control panel for longer than 2 seconds.

The Inverter indicator will turn off and the status indicator will turn amber and an audible alarm will sound. The load will transfer to static bypass and the inverter will shut off.

NOTE

Pressing the Alarm Silence Switch cancels the audible alarm, but leaves the warning message displayed until the relevant condition is rectified.

2.Close maintenance breaker CB3.

The Maintenance Bypass supply is now in parallel with the UPS Static Switch supply.

3.Open output breaker CB5. This ends the bypass procedure. The load is now powered directly from the Maintenance Bypass supply.

4.Press the EPO (Emergency Power Off) button at the UPS front panel of this UPS module only. This will disable further Rectifier, Inverter, Static Switch and Battery operation. This will not affect the manual maintenance bypass power switch. If a Liebert NX battery cabinet is connected, the battery circuit breaker will shunt trip open.

5.Open the rectifier switch CB1 and bypass breaker CB2.

All operator indicators and messages will turn off as the utility-driven internal power supplies decay. The unit will power down, but the load will continue to be supplied by the manual Mainte- nance bypass.

! WARNING

Wait 5 minutes for the internal DC busbar capacitors to discharge before attempting to remove the internal protective barriers.

! WARNING

Even with the UPS in maintenance bypass and “Off,” portions of the unit are still energized. Service is to be performed by qualified personnel only.

! CAUTION

The load equipment is not protected from normal supply aberrations when operating in maintenance bypass mode.

6. To return unit to normal operation, follow the steps in 9.2.1 - Startup Procedure.

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Contents Liebert NX UPS Page Table of Contents Options UPS SpecificationsOperator Control and Display Panel Operating Instructions Pop-Up WindowsSpecifications and Technical Data Appendix a UPS Status MessagesTables Page Important Safety Instructions Battery Cabinet Precautions Glossary of Symbols Installation External InspectionsPreliminary Checks Internal InspectionsUPS Location Mechanical Considerations Battery LocationConsiderations in Moving the Liebert NX Special Considerations for Parallel SystemsCable Entry Floor InstallationClearances System CompositionCabinet arrangement-Liebert NX units and battery cabinets UPS Cable Rating Power CablingLug Size and Torque Requirements UPS Input Configuration Cabling GuidelinesCable Connections Input and output busbarsProtective Devices Safety GroundUPS Rectifier and Bypass Input Supply Common Input Connections Cabling ProcedureOutput System Connections-Ensure Correct Phase Rotation Dual Input ConnectionsMonitor Board Features Frequency Converter ModeControl Cables Dry Contacts Input Dry Contacts Maintenance Bypass Cabinet InterfaceMaintenance bypass cabinet interface Input dry contacts atBCB Control Interface BCB control interfaceOutput Dry Contacts Inverter mode relay centerMain input fault relay center Output dry contact relaysEPO input contact relays EPO Input-OptionalIndicates Pin Safety IntroductionExternal Battery Cabinet Installation Battery CabinetsInstallation Considerations Connecting the BatteriesInsulated Post Tray Handle For Cabling Non-Standard Batteries Connecting the Battery Cabinet to the UPSBCB Shunt Trip This power must be UPS protected Alber Monitoring System-OptionalPerformance Requirements LBS Cable and SettingsLoad Bus Synchronization LBS CableFeatures of Parallel System Configuring Parallel System OperationGeneral Operating Principles Redundancy Paralleling Installing Parallel SystemOperation Modes Summary Conditions for Parallel System Cabinet InstallationPower Cables Preliminary ChecksAuxiliary Dry Contact Cables InterconnectingCables QByp Q1Ext Q2ExtTo Load Normally Open EPO Normally Closed EPOUPS mechanical characteristics UPS Mechanical CharacteristicsEnvironmental characteristics Conformity and StandardsUPS Electrical Characteristics UPS terminalRated Power kVA 100 120 Rectifier input powerLiebert approved replacement batteries Battery Manufacturer Models SuppliedInverter Output DC Intermediate CircuitBypass Input Left Side GND Left Side View Front View Max. Door Swing U3819205 Ext Batt530628 Pg , Rev Battery Breaker External Battery CabinetAuxiliary Contacts Top Top Front Right Side Front Rear SystemRear FRONTOutput Run From Conductors Ph A, B, C UPS Outputs Ph A, B, C System InputPh A, B, C UPS Inputs AC OutputPh A, B, C System Outputs Utility UPS #1-UPS #4 Module AC Ph A, B, C UPS InputsGround UPS Isometric View U3819301Single module block diagram dual input configuration General DescriptionBypass Mode Normal ModeBattery Mode Bypass SuppliesMaintenance Mode Parallel Redundancy Mode System ExpansionOperator Control Panel Display Panel LayoutMimic indicators Control buttons Navigation keys Detailed view of control panelMimic Display Indicators Mimic display status indicatorsControl Buttons Control buttonsAudible Buzzer LCD OverviewIcons for navigation keys Navigation KeysUPS System Information Description of items in UPS system windowLCD Menus and Data Items Mains Descriptions of UPS menus and data window itemsMenu Type Item Type Explanation InputLanguage Selection Start/stop BatteryTests Current Date and Time Set date and timeUPS Status Messages Current status and history log recordsTypes of LCD Screens Default ScreenOpening Display UPS Help Screen Screen Saver WindowPop-Up Windows Liebert NX Operating Modes UPS operating modesCircuit Breakers Circuit breakersIndicator State Startup ProcedureUPS Startup Switch from Normal Mode to Bypass Mode Switch from Bypass Mode to Normal ModeMaintenance Bypass Procedure and Powering Down the UPS Auto Restart Emergency Shutdown With EPOBattery Undervoltage Pre-Warning Battery ProtectionMulti-Module System Procedures Battery End-of-Discharge EOD ProtectionTie breaker Inserting One Module into a Multi-Module System LED Function StatusShutdown Procedure-Complete UPS and Load Shutdown Commissioning a Parallel SystemParallel System Start Up Analog Input Interface Power OutputCommunication and Other User Terminals Liebert IntelliSlot CommunicationComments See 10.1.5 ConfiguringLiebert NX communication options Baud RatesConfiguring Baud Rates Liebert IntelliSlot Web card display Relay Card Relay Card pin configurationRelay card jumper configuration Pin Function OperationAssignment MultiPort 4 CardPin Description LBS Mode-Load Bus Synchronization Remote Alarm MonitorReplacing Dust Filters Lug Size and Torque Requirements Torque specificationsBattery torque rating Cable Lengths Floor to Connection Point Inside UPSDistance to connection points on the Liebert NX UPS Parallel system current tableCable size and tightening torques External cabinet dimensions, including side panelsLead/Lag ratings 250 10 N*m Battery Run Times Estimated battery run time, minutesUPS status messages Services at 800-543-2378 for assistanceEvent Message Description / Suggested Action if any Bypass voltage exceeds the limit High ambient air temperatureBypass voltage is beyond the normal range Software according to the customer’s agreementInverter STS Fail Error can also leads to the alarmAlarm if applicable Condition is removedEmergency Power Off EPOUPS status messages UPS Status Messages Page Ti n Ne tIti That
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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.

One of the main features of the Emerson 480V systems is their scalability. These systems can be easily adapted and expanded as operational demands grow, thereby reducing initial investment costs and providing a flexible solution for evolving business needs. This ability to scale is crucial in a fast-paced environment where demands can change rapidly.

The Emerson 480V systems also incorporate advanced technologies for improved performance and safety. One key technology is the use of smart grid solutions. This enables real-time monitoring, diagnostics, and control, allowing facility managers to optimize energy consumption and reduce operational costs. Furthermore, these systems often include integrated protection devices that enhance safety measures by minimizing the risk of electrical faults, overloads, or short circuits.

Energy efficiency is another characteristic that distinguishes Emerson 480V systems from traditional alternatives. With advanced power management features, these systems effectively reduce energy waste and lower electricity bills. Emerson’s commitment to sustainability is evident in its designs, which aim to minimize environmental impact through energy-efficient technologies.

The build quality of Emerson 480V systems is also noteworthy. They are designed to withstand harsh industrial environments and are constructed with high-grade materials that promote longevity and reliability. The modular design allows for easy maintenance and repair, which further extends the lifespan of the system.

Additionally, Emerson 480V systems are equipped with user-friendly interfaces that facilitate ease of operation. This ensures that operators can efficiently manage and control power distribution without extensive training. The combination of performance, scalability, safety features, and user-centric design makes Emerson 480V systems an ideal choice for businesses looking to enhance their electrical infrastructure.

In summary, Emerson 480V power systems are a leading solution for industrial power distribution, characterized by their scalability, smart technology integration, energy efficiency, robust build quality, and user-friendly operation. These attributes make them a valuable investment for any organization aiming to improve its electrical management and operational performance.
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