American Power Conversion MX28B2400, MX28B4800 manual DC Distribution, Battery Management

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System Status and Alarm Reporting

The PSCU monitors system voltage using a high accuracy digital voltmeter attached to the system bus. The PSCU monitors system temperature using a temperature IC mounted in the PSCU. The PSCU monitors system current by summing the current reported by individual rectifiers. The PSCU reports a number of system alarms including system high/low voltage and high/low temperature. Refer to Section 5.6 for PSCU control functions.

5.4. DC Distribution

Distribution is included in each bay for up to 48 plug-in circuit breakers, a variety of bolt in breaker sizes or four telecom fuses. Circuit breaker bays with three rows of bolt in circuit breakers or fuse bays are also available. The plug-in circuit breakers can be 1 to 100 amps, with 60-100 amp breakers requiring two positions and a circuit breaker adapter kit. When a plug-in circuit breaker trips, a normally open switch closes and a CB alarm is reported by the PSCU. To disconnect a load attached to a circuit breaker, move the lever to the down “OFF” position. To disconnect a load attached to a telecom fuse pull the fuse holder straight out of the fuse holder base.

NOTE: Plug-in Circuit breaker alarm contacts close when the circuit breaker is tripped but not when it is turned OFF. Bolt-in Circuit breaker alarm contacts close when the circuit breaker is tripped or turned OFF.

5.5. Battery Management

Battery Charging and Protection

Battery charging and protection are integrated into the MX28B DC power system to support the primary function of providing power to the load. Accurate measurement of battery parameters like voltage, current and temperature are used to maintain and protect the batteries attached to the power plant.

Charging the battery at the correct rate reduces battery heating, increases the charge returned to the battery and prevents excess hydrogen generation or, in the case of VRLA batteries, possible thermal runaway. Battery Maximum Recharge Current is set to the appropriate rate, which is usually based on the size of the battery plant in Ampere-hours.

A typical recharge current setting is battery capacity (abbreviated as “C”) divided by number of charging hours. As an example, a “C/10” rate will basically return the battery to full charge in 10 hours. A C/8 rate is probably the highest current, which should be considered for charging under normal circumstances.

MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual

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Contents VDC Power Systems Table of Contents Commissioning and Preventive Maintenance APC Worldwide Customer Support Limited Product Warranty Revision Date Description Revision HistoryGeneral Precautions Safety FirstHow to Use This Manual IntroductionGeneral Information 1 MX28B-1200 -48 VDC Power Plant Rectifier Bay 2 MX28B Block Diagram Room / Location InstallationMechanical Installation Unpacking EquipmentMounting Power Bus Connections2 MX28B-1200-2400 has a maximum 5 Circuit Breaker / LVD Expansion Board Circuit Breaker/LVD Ribbon Cable ConnectionsAC Power Connections Fuse Alarm Ribbon Cable ConnectionsVentilation 1 AC Input Wiring Planning the Battery Installation Battery Connections1 Battery Cable Connection Locations Connecting the Battery CablesDC System Grounding 2 Battery Probe ConnectionDC Plug-in Circuit Breakers DC Power Output Over-Current ProtectionBreaker Part Number Rating 2 Plug-in Circuit Breakers 4 Bolt-in Circuit Breakers DC Bolt-in Circuit Breakers5 Telecom Fuses Telecom FusesPlug-in Circuit Breaker Installation Installation of Circuit Breakers and Fuses2 Circuit Breaker Alarm Wiring Bolt-in Circuit Breaker InstallationGMT Fuse Installation Telecom Fuse InstallationCircuit Breaker Connections 60-100 Amps Load ConnectionsCable Size Considerations Circuit Breaker Connections 1 to 50 AmpsSmart Cable DB9 Connection Monitoring and Relay Output ConnectionsGMT Fuse Connections Front Panel DB9 ConnectionRelay Output Connections RJ45 Ethernet ConnectorNO-NC-C External Alarm Input ConnectionsRectifier Module Installation Pre-Commissioning Inspection Commissioning and Preventive MaintenanceElectrical Installation Battery Visual and Safety InspectionAC Power Up CommissioningInitial Set-up LVD Test DC Power UpBattery Power Up Rectifier TestOutput Relays Battery Temperature CompensationCircuit Breaker/ Fuse Test User InputsFinal Inspection Operation Technical DescriptionRectifier Management System Current System ManagementSystem Output Capacity System Voltage ControlDC Distribution Battery ManagementSystem Status and Alarm Reporting Battery Charging and ProtectionControls and Indicators Battery/Load Low Voltage DisconnectFront Panel User Interface Parameter Locations, Descriptions, and Default Values Status Alarms System Modules Batt PIN OEMSwitzer Alarm ItemNo Alarms AddressBatt HV Alm Batt HT AlmBatt HT Thr 70.0 CComp Hknee Cir Bkr 1 Alm m+Major Cir Bkr 72 Almm+Minor Fuse 1 AlmFuse 16 Alm Hw Batt C Almm+LVD Trip LVD ResetLVD Option 48.00Relay Major Out-Rly 1 Dly m+Sec Out-Rly 6 Dly m+Rect 1ofN Almm+ DisableRect 1 Desc MRF28H54Sys LT Thr Sys HV AlmSys HV Thr Sys LT Alm90025 TimeControl Unit Menu Structure SYS MS System Module SET-ALM Setup DAV e l C o n d L e v e l I r d L e v e l U r t h L e v e l SYS Sysin Modrec AM Info Modfuse LM Alias Fuse MOD Modlvd Modlvd LM Param Alarm Outputs Output Relays Front Panel LED IndicatorsSection External Alarm Inputs Input Relays Physical Connections Command and Monitoring ProtocolRemote Monitoring DescriptionInspection Preventive MaintenanceSystem Visual and Safety Inspection EquipmentTest System Voltage TestRectifier Current Test Rectifier Current Share Test Rectifier Alarm TestSystem Temperature Test Battery Current TestBattery Preventive Maintenance Procedure Battery Temperature TestFinal Inspection 1MRF28H54BV50 Rectifiers SpecificationsAC Input 1MRF28H54BV RectifiersRectifiers VDCPower Shelf Control Unit Mechanical EnvironmentalCompliance Worldwide APC Worldwide Customer SupportUS and Canada Toll FreeLimited Product Warranty