American Power Conversion MX28B200 user manual Load Connections, GMT Fuse Installation

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GMT Fuse Installation

Fuse holders that accommodate GMT fuses are located on the interface card mounted in the top left side of the unit. Insert the fuse in the holder; observing the tripped indicator is correctly oriented. These fuse holders are only connected to -48VDC if the system has been purchased with the GMT fuse option. This option supplies -48VDC to lugs on the interface card through a 50 Amp circuit breaker located in circuit breaker Position 1. The interface card provides fuse holders for eight fuses, labeled “F1” through “F8”, which can be used for small -48V DC loads. Use the chart shown in Figure 3.7-2to help determine what size fuses will carry the desired current. Refer to Figure 3.8-3for Interface board GMT fuse locations.

 

 

 

 

 

AMBIENT TEMPERATURE

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20° C

50° C

 

60° C

 

 

 

 

 

 

 

 

 

 

 

 

10 Amp

 

7 Amp

6 Amp

 

5 Amp

 

FUSE SIZE

 

 

 

 

 

 

 

 

 

12 Amp

 

8 Amp

7 Amp

 

6 Amp

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

15 Amp

 

10 Amp

9 Amp

 

8 Amp

 

 

 

 

 

 

 

 

 

 

 

Figure 3.7-2 GMT Fuse Temperature De-rating Chart

 

3.8. Load Connections

Cable Size Considerations

The DC load cable(s) should be sized sufficiently large to limit the voltage drop from the MX28B DC power plant to the loads per system design requirements. The cable(s) must also carry the full load current during battery operation. During battery operation the voltage will be lower and for constant power loads, therefore the current will typically be higher. If assistance is required to determine the necessary cables for the application, contact your sales representative or APC.

Circuit Breaker Connections (1 to 50 Amps)

Connections for 1 to 50 amp DC loads require standard two-hole lugs with holes for #10 screws (810-0032) on 5/8” centers and are located directly above the corresponding circuit breaker. The load returns connect to the return bus located just above and rearward of the breaker connection points as seen in Figure 3.8-1 The return bus provides 24 sets of threaded #10-32 holes on 5/8” centers and four sets of threaded ¼-20 holes on ¾” centers for connection of two-hole lugs on load return wires.

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 Mechanical Installation InstallationUnpacking Equipment Room / LocationVentilation AC Power ConnectionsBattery Connections Planning the Battery installationConnecting 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 FusesLoad Connections GMT Fuse InstallationCable Size Considerations Circuit Breaker Connections 1 to 50 Amps1 Standard lug for 1 to 50A breakers Circuit Breaker Connections 60-100 Amps2 Adaptor and lugs for 60-100 Amp breakers GMT Fuse ConnectionsMonitoring and Relay Output Connections RJ45 Ethernet ConnectorFront Panel DB9 Connection Smart Cable DB9 ConnectionNO-NC-C External Alarm Input ConnectionsInitial Power-Up and Checkout Rectifier Module InstallationSystem Parameters Verification/Adjustment Full System Power Up Operation Technical DescriptionRectifier Management System Output Capacity System ManagementSystem Voltage Control System CurrentSystem Status and Alarm Reporting Battery ManagementBattery Charging and Protection DC DistributionBattery Temperature Compensation Controls and IndicatorsBattery/Load Low Voltage Disconnect Front Panel User InterfaceMX28B Status Alarms System Modules Batt PIN OEM Parameter Locations, Descriptions, and Default Values Minor Batt Disc Alm m+Batt Disc Thr m+ 10 a48V Cir BkrCir Bkr 1 Alm m+ Major000189 FW VersionGMT 1 Alm GMT 8 AlmLVD Reset EnableIn-Rly 1 Alm IgnoreOut-Rly 1 Alm m+ OEM S OffsetOut-Rly 6 Alm m+ Out-RlyMin RectFailCommRect Cfg Alm Rect CL AlmRect 1 FF DisableRect 1 RFA Rect RFA AlmSys LV Alm Sys LT ThrSys LV Thr 50.00Control 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 Remote Monitoring Command and Monitoring ProtocolDescription Physical ConnectionsPage AC Input Specifications1MRF28H54BV Rectifiers 1MRF28H54BV50 RectifiersPscu RectifiersMechanical Power Shelf Control UnitMounting Compliance EnvironmentalPage APC Worldwide Customer Support Page General Provisions Warranty