Document Outline

• Nexus 1250/1252 Installation and Operation Manual V.1.25 Novemeber 13, 2006
  • Warranty
  • Table of Contents
  • Chapter 1: Three-Phase Power Measurement
    • 1.1: Three-Phase System Configuration
      • 1.1.1: Wye Connection
      • 1.1.2: Delta Connection
      • 1.1.3: Blondell's Theorem and Three Phase Measurement
    • 1.2: Power, Energy and Demand
    • 1.3: Reactive Energy and Power Factor
    • 1.4: Harmonic Distortion
    • 1.5: Power Quality
  • Chapter 2: Nexus Overview
    • 2.1: The Nexus System
    • 2.2: DNP V3.00 Level 1 and Level 2
    • 2.3: Flicker
    • 2.4: INP2 Internal Modem with Dial-In/Dial-Out Option
      • 2.4.1: Hardware Overview
      • 2.4.2: Dial-In Function
      • 2.4.3: Dial-Out Function
    • 2.5: Total Web Solutions
      • 2.5.1: Hardware Overview
      • 2.5.2: Hardware Connection
    • 2.6: Measurements and Calculations
    • 2.7: Demand Integrators
    • 2.8: Nexus External I/O Modules
    • 2.9: Nexus 1250/1252 Meter Specifications
    • 2.10: Nexus P40N, P41N, P43N LED External Display Specifications
    • 2.11: Nexus P60N Touch Screen Display Specifications
  • Chapter 3: Hardware Installation
    • 3.1: Mounting the Nexus 1250/1252 Meter
    • 3.2: Mounting the Nexus LED External Displays
    • 3.3: Mounting the Nexus P60N Touch Screen External Display
    • 3.4: Mounting the Nexus External I/O Modules
  • Chapter 4: Electrical Installation
    • 4.1: Wiring the Monitored Inputs and Voltages
    • 4.2: Fusing the Voltage Connections
    • 4.3: Wiring the Monitored Inputs - VRef
    • 4.4: Wiring the Monitored Inputs - VAux
    • 4.5: Wiring the Monitored Inputs - Currents
    • 4.6: Isolating a CT Connection Reversal
    • 4.7: Instrument Power Connections
    • 4.8: Wiring Diagrams
  • Chapter 5: Communication Wiring
    • 5.1: Communication Overview
    • 5.2: RS-232 Connection - Nexus Meter to a Computer
    • 5.3: Nexus RS-485 Wiring Fundamentals
    • 5.4: RS-485 Connection - Nexus to a Computer or PLC
    • 5.5: RJ-11 Connection - Nexus with Internal Modem to a PC
    • 5.6: RJ-45 Connection - Nexus with Internal Modem to Multiple PCs
    • 5.7: RS-485 Connection - Nexus to an RS-485 Master
      • 5.7.1: Using the Unicom 2500
      • 5.8: RS-485 Connection - Nexus to P40N Display
    • 5.9: RS-485 Connection - Nexus to P60N Display
    • 5.10: Communication Ports on the Nexus I/O Modules
    • 5.11: RS-485 Connection - Nexus to I/O Modules
    • 5.12: Steps to Determine Power Needed
    • 5.13: I/O Modules' Factory Settings with VA Ratings
    • 5.14: Linking Multiple Nexus Devices in Series
    • 5.15: Networking Groups of Nexus Meters
    • 5.16: Remote Communication Overview
    • 5.17: Remote Communication - RS-232
    • 5.18: Remote Communication - RS-485
    • 5.19: Programming Modems for Remote Communication
    • 5.20: Selected Modem Strings
    • 5.21: High Speed Inputs Connection
    • 5.22: Five Modes of Time Synchronization
    • 5.23: IRIG-B Connections
  • Chapter 6: Using the Nexus External Displays
    • 6.1: Overview
    • 6.2: Nexus P40N, P41N and P43N LED External Displays
      • 6.2.1: Connect Mutliple Displays
      • 6.2.2: Nexus P40N Modes
    • 6.3: Dynamic Readings Mode
    • 6.4: Navigational Map of Dynamic Readings Mode
    • 6.5: Nexus Information Mode
    • 6.6: Navigational Map of Nexus Information Mode
    • 6.7: Display Features Mode
    • 6.8: Navigational Map of Display Features Mode
    • 6.9: Nexus P60N Touch Screen External Display
    • 6.10: Navigational Map for P60N Touch Screen External Display
  • Chapter 7: Tranformer Loss Compensation
    • 7.1: Introduction
    • 7.2: Nexus 1250/1252 Transformer Loss Compensation
      • 7.2.1: Loss Compensation in Three Element Installations
        • 7.2.1.1: Three Element Loss Compensation Worksheet
  • Chapter 8: Nexus Time-of-Use
    • 8.1: Introduction
    • 8.2: The Nexus TOU Calendar
    • 8.3: TOU Prior Season and Month
    • 8.4: Updating, Retrieving and Replacing TOU Calendars
    • 8.5: Daylight Savings and Demand
  • Chapter 9: Nexus External I/O Modules
    • 9.1: Hardware Overview
      • 9.1.1: Port Overview
    • 9.2: Installing Nexus External I/O Modules
      • 9.2.1: Power Source for I/O Modules
    • 9.3: Using PSIO with Multiple I/O Modules
      • 9.3.1: Steps for Attaching Mutliple I/O Modules
    • 9.4: Factory Settings and Reset Button
    • 9.5: Analog Transducer Signal Output Modules
      • 9.5.1: Overview
      • 9.5.2: Normal Mode
    • 9.6: Analog Input Modules
      • 9.6.1: Overview
      • 9.6.2: Normal Mode
    • 9.7: Digital Dry Contact Relay Output (Form C) Module
      • 9.7.1: Overview
      • 9.7.2: Communications
      • 9.7.3: Normal Mode
    • 9.8: Digital Solid State Pulse Output (KYZ) Module
      • 9.8.1: Overview
      • 9.8.2: Communication
      • 9.8.3: Normal Mode
    • 9.9: Digital Status Input Module
      • 9.9.1: Overview
      • 9.9.2: Communication
      • 9.9.3: Normal Mode
    • 9.10: Specifications
  • Chapter 10: Nexus Monitor with Internal Modem Option
    • 10.1: Hardware Overview
    • 10.2: Hardware Connection
    • 10.3: Dial-In Function
    • 10.4: Dial-Out Function
  • Chapter 11: Nexus Meter with Internal Network Option
    • 11.1: Hardware Overview
    • 11.2: Hardware Connection
  • Chapter 12: Flicker
    • 12.1: Overview
    • 12.2: Theory of Operation
    • 12.3: Setup
    • 12.4: Software - User Interface
    • 12.5: Logging
    • 12.6: Polling
    • 12.7: Log Viewer
    • 12.8: Performance Notes
  • Appendix A: Transformer Loss Compensation Excel Spreadsheet with Examples
    • A.1: Calculating Values
    • A.2: Excel Spreadsheet with Example Numbers
  • Glossary