American Power Conversion MX28B200 user manual DC Distribution, Battery Management

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System Status and Alarm Reporting

The PSCU will monitor system voltage using a high accuracy digital voltmeter attached to the system bus. The PSCU will monitor system temperature using a temperature IC mounted in the PSCU. The PSCU will monitor system current by summing the current reported by individual rectifiers. The PSCU will report a number of system alarms including system high/low voltage and high/low temperature. Refer to Section 4.6 for PSCU control functions.

4.4. DC Distribution

Distribution is included for up to 24 plug-in circuit breakers. These circuit breakers can be 1 to 100 amps, with 60-100 amp breakers requiring two positions and a circuit breaker adapter kit. When a 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.

NOTE: Circuit breaker alarm contacts close when the circuit breaker is tripped but not when it is turned OFF.

Eight GMT fused outputs are also available as an option. This option uses one of the 24 available circuit breaker positions. When a GMT fuse trips, an alarm spring is revealed that visually indicates the fuse is blown. The alarm spring also makes contact with a third contact on the fuse holder, which connects the –48 VDC bus voltage to the GMT fuse alarm input in the PSCU. Upon measuring voltage on this alarm circuit, the PSCU will report a GMT fuse alarm. To disconnect a load attached to a GMT fuse, pull the fuse out of the fuse socket.

NOTE: GMT fuse alarm contacts complete the alarm circuit when the fuse is tripped but not when the fuse is removed.

4.5. 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

MX28B200/400 –48 VDC User’s Manual (990-9133)

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Contents VDC Power Systems Page Table of Contents Remote Monitoring Revision Date Description Revision HistoryPage General Precautions Safety FirstPage General Information Introduction2 MX28B Block Diagram How to Use This Manual Page Room / Location InstallationMechanical Installation Unpacking EquipmentVentilation AC Power ConnectionsPlanning the Battery installation Battery ConnectionsConnecting the Cables DC System Grounding Battery Temperature Probe InstallationDC Circuit Breakers DC Power Output Over-Current Protection#10 studs on 5/8 centers Fuse Rating Part Number DC GMT FusesPlug-in Circuit Breaker Installation Installation of Circuit Breakers and FusesCircuit Breaker Connections 1 to 50 Amps GMT Fuse InstallationLoad Connections Cable Size Considerations1 Standard lug for 1 to 50A breakers Circuit Breaker Connections 60-100 Amps2 Adaptor and lugs for 60-100 Amp breakers GMT Fuse ConnectionsSmart Cable DB9 Connection RJ45 Ethernet ConnectorMonitoring and Relay Output Connections Front Panel DB9 ConnectionNO-NC-C External Alarm Input ConnectionsInitial Power-Up and Checkout Rectifier Module InstallationSystem Parameters Verification/Adjustment Full System Power Up Technical Description OperationRectifier Management System Current System ManagementSystem Output Capacity System Voltage ControlDC Distribution Battery ManagementSystem Status and Alarm Reporting Battery Charging and ProtectionFront Panel User Interface Controls and IndicatorsBattery Temperature Compensation Battery/Load Low Voltage DisconnectMX28B Status Alarms System Modules Batt PIN OEM Parameter Locations, Descriptions, and Default Values 10 a Batt Disc Alm m+Minor Batt Disc Thr m+Major Cir Bkr48V Cir Bkr 1 Alm m+GMT 8 Alm FW Version000189 GMT 1 AlmIgnore EnableLVD Reset In-Rly 1 AlmOut-Rly OEM S OffsetOut-Rly 1 Alm m+ Out-Rly 6 Alm m+Rect CL Alm RectFailCommMin Rect Cfg AlmRect RFA Alm DisableRect 1 FF Rect 1 RFA50.00 Sys LT ThrSys LV Alm Sys LV ThrControl 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 AM Info Modgmt LM Alias GMT MOD Modlvd Front Panel LED Indicators External Alarm Inputs Input Relays Alarm Outputs Output RelaysPage Physical Connections Command and Monitoring ProtocolRemote Monitoring DescriptionPage 1MRF28H54BV50 Rectifiers SpecificationsAC Input 1MRF28H54BV RectifiersPscu RectifiersMechanical Power Shelf Control UnitMounting Compliance EnvironmentalPage APC Worldwide Customer Support Page General Provisions Warranty
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