American Power Conversion MX28B400 user manual DC System Grounding

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3.5. DC SYSTEM GROUNDING

The return bus for the power plant must be connected to the Central Office Ground. The left end of the return bus provides a pair of threaded 3/8-16 holes on 1-inch (25.4 m) centers for connection of a two-hole lugged cable to the Master Station Ground. Details for this connection should be provided in the site electrical grounding plans.

Figure 3.5-1 DC Ground Connection Point

MX28B400 +24 VDC User’s Manual

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Contents Page Table of Contents Remote Monitoring Revision Date Description Revision HistoryGeneral Precautions Safety FirstGeneral Information Introduction2 MX28B-400 +24 Vdc System Wiring Diagram with Battery LVD How to Use This Manual Mechanical Installation InstallationUnpacking Equipment Room / LocationVentilation AC Power ConnectionsPlanning the Battery installation Battery ConnectionsConnecting the Cables 2 Battery Temperature Probe Installation Battery Temperature Probe InstallationDC System Grounding DC Circuit Breakers DC Power Output Over-Current ProtectionBreaker Part Number Adaptor Size Rating Load Cable Size Considerations Plug-in Circuit Breaker InstallationCircuit Breaker Connections 60-100 Amps Circuit Breaker Connections 1 to 50 AmpsGMT Fuse Option Monitoring and Relay Output ConnectionsFront Panel DB9 Connection Smart Cable DB9 ConnectionRelay Output Connections RJ45 Ethernet ConnectorNO-NC-C External Alarm Input ConnectionsInitial Power-Up and Checkout Rectifier Module InstallationBattery Maximum Recharge Rate default = 12A System Parameters Verification/AdjustmentFull System Power Up Technical Description OperationRectifier Management System Management System Status and Alarm ReportingSystem Output Capacity System Voltage ControlBattery Charging and Protection Battery ManagementBattery Temperature Compensation DC DistributionBattery/Load Low Voltage Disconnect Controls and IndicatorsFront Panel User Interface Parameter Locations, Descriptions, and Default Values Status Alarms System Modules Batt PIN OEMNo Alarms Alarm ItemAddress Switzer Av22.00 MinorBatt Max Rechm+ 50 aComp Method m+ Comp LkneeComp TC 00mVHw Batt C Almm+ Fuse 1 AlmHw Batt T Almm+ Hw LVD AlmLVD Reset DisableLamp Test LVD OptionRelay Out-RlyOut-Rly 1 Dly m+ SecRect 1 CL Rect CL AlmRect 1 Curr 24.9Rect 1 Stdby Rect Stdby Almm+Store Cfg Sys Current26.7 Sys TempSys Voltage Test Maj RlyControl Unit Menu Structure Status AlarmsV 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 Sysout AP Alias MOD Modrec EM Modules Batt Rect Conv CIR SET-ALM Param MOD Modcir MOD Modlvd MT LVD SET-ALM Param Front Panel LED Indicators External Alarm Inputs Input Relays Alarm Outputs Output RelaysRemote Monitoring Command and Monitoring ProtocolDescription Physical ConnectionsAC Input Specifications1MRF28H27BV Rectifiers 1MRF28H27BV50 RectifiersRectifiers DC Output with either RectifierPscu Power Shelf Control UnitEnvironmental MechanicalCompliance APC Worldwide Customer Support Limited Product Warranty