DC System Grounding | American Power Conversion MX28B400 specs

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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American Power Conversion MX28B400 user manual DC System Grounding

Contents

Page Table of Contents Remote Monitoring Revision Date Description Revision History General Precautions Safety First General Information Introduction 2 MX28B-400 +24 Vdc System Wiring Diagram with Battery LVD How to Use This Manual Mechanical Installation InstallationUnpacking Equipment Room / Location Ventilation AC Power Connections Planning the Battery installation Battery ConnectionsConnecting the Cables 2 Battery Temperature Probe Installation Battery Temperature Probe Installation DC System Grounding DC Circuit Breakers DC Power Output Over-Current Protection Breaker Part Number Adaptor Size Rating Load Cable Size Considerations Plug-in Circuit Breaker Installation Circuit Breaker Connections 60-100 Amps Circuit Breaker Connections 1 to 50 Amps GMT Fuse Option Monitoring and Relay Output ConnectionsFront Panel DB9 Connection Smart Cable DB9 Connection Relay Output Connections RJ45 Ethernet Connector NO-NC-C External Alarm Input Connections Initial Power-Up and Checkout Rectifier Module Installation Battery Maximum Recharge Rate default = 12A System Parameters Verification/Adjustment Full System Power Up Technical Description OperationRectifier Management System Management System Status and Alarm ReportingSystem Output Capacity System Voltage Control Battery Charging and Protection Battery ManagementBattery Temperature Compensation DC Distribution Battery/Load Low Voltage Disconnect Controls and IndicatorsFront Panel User Interface Parameter Locations, Descriptions, and Default Values Status Alarms System Modules Batt PIN OEM No Alarms Alarm ItemAddress Switzer Av 22.00 MinorBatt Max Rechm+ 50 a Comp Method m+ Comp LkneeComp TC 00mV Hw Batt C Almm+ Fuse 1 AlmHw Batt T Almm+ Hw LVD Alm LVD Reset DisableLamp Test LVD Option Relay Out-RlyOut-Rly 1 Dly m+ Sec Rect 1 CL Rect CL AlmRect 1 Curr 24.9 Rect 1 Stdby Rect Stdby Almm+Store Cfg Sys Current 26.7 Sys TempSys Voltage Test Maj Rly Control Unit Menu Structure Status Alarms V 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 Relays Remote Monitoring Command and Monitoring ProtocolDescription Physical Connections AC Input Specifications1MRF28H27BV Rectifiers 1MRF28H27BV50 Rectifiers Rectifiers DC Output with either Rectifier Pscu Power Shelf Control Unit Environmental MechanicalCompliance APC Worldwide Customer Support Limited Product Warranty