Emerson 480V user manual Power Cabling, Cable Rating, Lug Size and Torque Requirements

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Electrical Connections

2.0ELECTRICAL CONNECTIONS

The UPS requires both power and control cabling once it has been mechanically installed. All control cables must run separate from power cables in metal conduits or metal ducts that are electrically bonded to the metalwork of the cabinets to which they are connected.

! WARNING

Before connecting input power to the Liebert NX, ensure that you are aware of the location and operation of the overcurrent protection devices that connect the UPS input/bypass supply to the power distribution panel.

De-energize and lockout or tagout all incoming high- and low-voltage power circuits before installing cables or making any electrical connections.

2.1Power Cabling

2.1.1Cable Rating

The main factors affecting the choice and size of cable are voltage, current (also taking into account overcurrent), room temperature and conditions of installation of the cable.

The power cables of the system must be sized with respect to the following description:

•UPS input cables - The UPS input cables must be sized for the maximum input current, includ- ing the maximum battery recharge current, given in Table 8, with respect to the unit rating and the input AC voltage.

•UPS bypass and output cables - The bypass and output cables must be sized for the nominal output current, given in Table 8, with respect to the unit rating and the output AC voltage.

•Battery cables - When connecting an external battery cabinet, the battery cables must be sized for the battery discharge current at the end-of-discharge voltage, as given in Table 8, with respect to the unit rating.

NOTE

Table 8 gives nominal currents for determining the size of UPS power cables. Other important factors to consider include cable route length and coordination with protective devices.

The power cables can be sized to suit the UPS unit rating according to Table 8.

Lug Size and Torque Requirements

Refer to Table 24 for lug size and torque requirements.

NOTE

When installing a Liebert NX with Softscale™ capability Liebert recommends sizing the input, bypass and output cabling for the UPS’s maximum rating. Properly sizing the cable will reduce the work required to upgrade the UPS.

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Contents Liebert NX UPS Page Table of Contents UPS Specifications OptionsOperator 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 InspectionsInternal Inspections Preliminary ChecksUPS 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 Power Cabling Cable RatingLug Size and Torque Requirements UPS Input Configuration Cabling GuidelinesCable Connections Input and output busbarsSafety Ground Protective DevicesUPS Rectifier and Bypass Input Supply Common Input Connections Cabling ProcedureOutput System Connections-Ensure Correct Phase Rotation Dual Input ConnectionsFrequency Converter Mode Monitor Board FeaturesControl 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-Optional EPO input contact relaysIndicates Pin Safety IntroductionExternal Battery Cabinet Installation Battery CabinetsConnecting the Batteries Installation ConsiderationsInsulated Post Tray Handle For Cabling Connecting the Battery Cabinet to the UPS Non-Standard BatteriesBCB Shunt Trip This power must be UPS protected Alber Monitoring System-OptionalPerformance Requirements LBS Cable and SettingsLoad Bus Synchronization LBS CableConfiguring Parallel System Operation Features of Parallel SystemGeneral Installing Parallel System Operating Principles Redundancy ParallelingOperation Modes Summary Conditions for Parallel System Cabinet InstallationPower Cables Preliminary ChecksInterconnecting Auxiliary Dry Contact CablesCables Q1Ext Q2Ext QBypTo 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 SuppliedDC Intermediate Circuit Inverter OutputBypass Input Left Side GND Left Side View Front View Max. Door Swing U3819205 Batt Ext530628 Pg , Rev External Battery Cabinet Battery BreakerAuxiliary 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 OutputUtility UPS #1-UPS #4 Module AC Ph A, B, C UPS Inputs Ph A, B, C System OutputsGround 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 InputStart/stop Battery Language SelectionTests Current Date and Time Set date and timeUPS Status Messages Current status and history log recordsDefault Screen Types of LCD ScreensOpening Display UPS Help Screen Screen Saver WindowPop-Up Windows Liebert NX Operating Modes UPS operating modesCircuit Breakers Circuit breakersStartup Procedure Indicator StateUPS 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 OperationMultiPort 4 Card AssignmentPin Description Remote Alarm Monitor LBS Mode-Load Bus SynchronizationReplacing 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 tableExternal cabinet dimensions, including side panels Cable size and tightening torquesLead/Lag ratings 250 10 N*m Battery Run Times Estimated battery run time, minutesServices at 800-543-2378 for assistance UPS status messagesEvent 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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