Emerson NX manual Matching Battery Cabinets-Optional, Battery voltage, nominal and float

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Maintenance

NOTICE

Risk of improper cleaning. Can cause equipment damage.

Batteries should be cleaned with a dry cloth or a cloth lightly moistened with water. Do not use cleaners on the batteries. Solvents can make the battery cases brittle.

Because individual battery characteristics are not identical and may change over time, the UPS module is equipped with circuitry to equalize battery cell voltages. This circuit increases charging voltage to maintain flooded type battery cells at full capacity.

Because individual battery characteristics are not identical and may change over time, the UPS module is equipped with circuitry to equalize battery cell voltages. This circuit increases charging voltage to maintain flooded type battery cells at full capacity.

! WARNING

Risk of electric shock, explosive reaction, hazardous chemicals and fire. Can cause equipment damage, personal injury and death.

Do not use equalize charging with valve-regulated, lead-acid batteries. Refer to the battery manufacturer’s manual, available on the manufacturer’s Web site, for specific information about equalize charging.

Matching Battery Cabinets—Optional

Although the individual battery cells are sealed (valve-regulated) and require only minimal maintenance, the Battery Cabinets should be given a periodic inspection and electrical check. Checks should be performed at least annually to ensure years of trouble-free service.

Voltage Records: With the Battery Cabinet DC circuit breaker closed and the connected UPS operating, measure and record battery float voltage. With the DC circuit breaker open, measure and record the nominal (open circuit) voltage. Both these measurements should be made across the final positive and negative terminal lugs. Compare these values with those shown below. The recorded nominal voltage should be no less than the value shown; while the recorded float voltage should be within the range shown. If a discrepancy is found, contact Liebert Services.

Table 5 Battery voltage, nominal and float

 

Battery Voltage, VDC

Number of Cells

 

 

Nominal

Float

 

 

 

240

480

527 - 552

 

 

 

Power Connections: Check for corrosion and connection integrity. Inspect wiring for discolored or cracked insulation. Clean and/or retighten as required. Refer to torque specifications in Table 7.

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Liebert®NX™

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Contents Liebert NX Product Warranty Registration Table of Contents Options MaintenanceSpecifications Figures Page Important Safety Instructions Battery Cabinet Precautions General Description Typical single module UPS system one-line diagramBypass Mode Normal ModeBattery Mode Maintenance BypassOptions Main component locations-225 to 300kVA Liebert NX FeaturesFront Doors Removed Main display screen, typical System Status Touchscreen NavigationMain Display Screen Status Rectifier Bypass Inverter Chg/Boost Battery LoadEvents Log Menu Measures MenuBattery Test Battery MenuBattery Status Battery parameters Battery MeasuresLife menu Life MenuAnimated One Line Mimic Settings MenuRectifier Functional Block About MenuLoad on bypass, UPS available Load on BypassOff DC Source Input Power Failure-Load on DC SourceManual Operations-All Systems Remote Emergency Power OffStartup-Single Module System Startup-1+N System Load Transfer and Retransfer-Single Module System Transfer ProcedureRetransfer Procedure 6 1+N System Transfer load from UPS to Bypass 9 1+N System Shutdown 7 1+N System Transfer load from Bypass to UPSShut Down-Single Module UPS System Load Transfer-1+N System Add a UPS to the System Collective Load Transfer-1+N System Remove a UPS from System CollectiveCurrent-versus-time curves of overload capacity Automatic OperationsOverloads Without Transfer Automatic Transfers to Bypass Overload Condition Automatic Transfers to Bypass, UPS System FaultsAutomatic Retransfers to UPS MopUPS Shutdown and Monitoring Software Remote Alarm UnitConnectivity combinations Manage UPS AdapterConnectivity Available Selectable Output Contacts Available Selectable Input ContactsSafety Precautions Maintenance Agreements The Signature Program Liebert ServicesProfessional Startup TrainingAir Filters Routine MaintenanceRecord Log UPS component service life Battery MaintenanceLimited Life Components Component Expected Life ReplaceBattery Safety Precautions Battery voltage, nominal and float Matching Battery Cabinets-OptionalBattery Voltage, VDC Number of Cells Nominal Float 240 480 527Battery Mfr Battery Model # In-lb N-m Battery retorque valuesOther DC Sources Retorque ValueUpstream Feeder Circuit Breaker Setting Inspections Reporting a ProblemDetecting Trouble Items to check includeEnvironmental specifications Battery OperationDC Sources Other DC SourcesPhysical specifications Electrical specificationsSpecifications LiebertNX Page Is t Ne tTwor k Care
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