Electro-Voice 1252, 250 manual

0.25 A

INPUT

Figure 4.6: 3-Wire, 2-Element Delta Direct Voltage with 3 CTs.

Electro Industries/GaugeTech Doc # E107706 V1.25

4-9

Image 55

Electro-Voice 1252, 250 operation manual Wire, 2-Element Delta Direct Voltage with 3 CTs

Contents

Nexus 1250 /1252 Electro Industries/GaugeTech Doc # E107706 Nexus 1250/1252 Revision Statement of Calibration Customer Service and SupportProduct Warranty Limitation of Warranty DM Series Products About Electro Industries/GaugeTechApplications Futura+ Series Products Electro Industries/GaugeTech Doc # E107706 Table of Contents Nexus Time-of-Use Communication WiringUsing the Nexus External Displays Transformer Loss Compensation Flicker Nexus External I/O ModulesNexus Monitor with INP2 Internal Modem Option Nexus Monitor with Internal Network Option Glossary of Terms Three-Phase System Configurations Chapter Three-Phase Power MeasurementWye Connection Phase-to-Ground Voltage Phase-to-Phase Voltage Delta Connection Three-Phase Delta Winding Relationship Blondell’s Theorem and Three Phase Measurement Phase B Phase C Node n Phase a Power Use Over Time Power, Energy and Demand Time Interval Power kW Energy kWh Accumulated Minute Energy Use and Demand Reactive Energy and Power Factor Voltage and Complex 10 Nondistorted Current Waveform Harmonic Distortion 11 Distorted Current Wave Electro Industries/GaugeTech Doc # E107706 Cause Disturbance Type Source Power Quality Electro Industries/GaugeTech Doc # E107706 Nexus System Chapter Nexus Overview Nexus 1250/1252 Revenue Metering Nexus 1250/1252 Power Quality MonitoringDNP V3.00 Level 1 and Level Flicker Dial-Out Function Dial-In Function Hardware Connection Total Web Solutions Enter the Domain Name Server and Computer Name Root Mean Square RMS of Currents n = number of samples Measurements and Calculations Power Watts Total Power Watts per phaseApparent Power VA per phase Reactive Power VAR per phase Apparent Power VA Total Reactive Power VAR TotalPower Factor PF VAR hour VARh Phase AnglesTotal Harmonic Distortion %THD Watt hour Wh Demand Integrators Partial = ∑Value Nexus External I/O Modules Optional Other I/O Accessories Specification Nexus Meter Nexus 1250/1252 Meter Specifications Nexus P60N Touch Screen Display Specifications Nexus P40N, P41N, P43N LED External Display Specifications Mounting the Nexus 1250/1252 Meter Chapter Hardware Installation Nexus Meter Mounting Diagram, Side View Mounting the Nexus LED External Displays Nexus P40N LED External Display Mounting Diagrams Connect to Nexus Mounting the Nexus P60N Touch Screen External Display Cutout for Nexus P60N Touch Screen Display Nexus I/O Module Communication Ports Mounting the Nexus External I/O Modules Nexus I/O Modules Mounting Diagram, Front View Electro Industries/GaugeTech Doc # E107706 Chapter Electrical Installation Isolating a CT Connection Reversal Instrument Power Connections Figure # Description Wiring Diagrams 25 a 25A 4-Wire Wye, 3-Element with 3 PTs and 3 CTs 3-Wire, 2-Element Open Delta with 2 PTs and 3 CTs 3-Wire, 2-Element Open Delta with 2 PTs, 2 CTs 3-Wire, 2-Element Delta Direct Voltage with 3 CTs 3-Phase, 4-Wire Wye, 2.5 Element with 2 PTs, 3 CTs 4-Wire, 3-Element Grounded Delta with 4 CTs G Option Electro Industries/GaugeTech Doc # E107706 Communication Overview Chapter Communication Wiring RJ-11 Communication with Internal Modem Option MODBUS/TCP IRIG-B RS-232 Connection-Nexus Meter to a Computer Nexus RS-485 Wiring Fundamentals with RT Explanation For All RS-485 Connections Wire RS-485 Port Incorrect Connection Star Incorrect Connection T RS-485 Connection-Nexus Meter to a Computer or PLC Using the Unicom Unicom 2500 with Connections Nexus Meter Port Nexus Meter Port 12 Communication Ports on the Nexus I/O Modules Communication Ports on the Nexus I/O Modules 13 Nexus Meter Connected to Nexus I/O Module 11 RS-485 Connection-Nexus Meter to Nexus I/O Modules 13 I/O Modules’ Factory Settings and VA Ratings Steps to Determine Power Needed 14 Linking Multiple Nexus Devices in Series Linking Multiple Nexus Devices in Series 15 Networking Groups of Nexus Meters Networking Groups of Nexus Meters Remote Connection-RS-485 RS-485 wiring with a Modem Manager. See sectionRemote Communication Overview Remote Connection-RS-232 17 Remote Connections with Internal Modem Option RJ-45MODBUS/TCP over Ethernet Remote Communication-RS-485 Remote Communication-RS-232 Programming Modems for Remote Communication Selected Modem Strings Modem String/SettingHigh Speed Inputs Connection Five Modes of Time Synchronization IRIG-B Connections Installation Electro Industries/GaugeTech Doc # E107706 LED Display Up/Down Arrows Mode Button Nexus P40N Modes Connect Multiple DisplaysP41N Dynamic Readings Mode Electro Industries/GaugeTech Doc # E107706 Navigational Map of Dynamic Readings Mode Group 1 Device Time Nexus Information ModeGroup 4 External Display Units Readings Navigational Map of Nexus Information Mode Group 8 Display Scroll ON/OFF Display Features ModeGroup 1 Reset Max/Min Group 2 Reset Energy Navigational Map of Display Features Mode Nexus P60N Touch Screen External Display General Groups of Readings Reset Button View LimitsGeneral page Overview of Real Time Readings Amps Current Readings Details Volts Voltage Readings DetailsVolts Voltage Readings PH-N Volts Voltage Readings PH-PH Energy Accumulated Energy Information Real Time Power Real Time Power Readings DetailsDemand Power Demand Power Readings Details Amps Current Readings A-B-C TOU Register Demand TOU AccumulationsTouch Short Term or Long Term to view other Flicker screens Phasors Phasor Analysis Limits Limit StatusWaveform Real Time Graph Real Time Trending Channel Selector LOG Status Logging Statistics Reset Meter Reset Commands Nexus Port Settings Navigational Map for P60N Touch Screen External Display Introduction Chapter Transformer Loss Compensation Electro Industries/GaugeTech Doc # E107706 Nexus 1250/1252 Transformer Loss Compensation Loss Compensation in Three Element Installations Transformer Data from Transformer Manufacturer’s Test Sheet Three Element Loss Compensation Worksheet Base Conversion Factors Meter/Installation DataLoad Loss at Transformer Loss Watts Percentage Values Normalize Losses to Meter Base Calculate Load Loss Values Nexus TOU Calendar Chapter Nexus Time-of-Use Updating, Retrieving and Replacing TOU Calendars TOU Prior Season and MonthDaylight Savings and Demand I/O Module Components Chapter Nexus External I/O Modules Port Overview Nexus Meter Connected to I/O Module Installing Nexus External I/O Modules Psio Power Source Side View Showing Male RS-485 Side Port Power Source for I/O Modules Steps for Attaching Multiple I/O Modules Using Psio with Multiple I/O Modules Factory Settings Factory Settings and Reset Button Overview Analog Transducer Signal Output Modules Normal Mode Analog Input Modules Normal Mode Digital Dry Contact Relay Output Form C Module Communication Digital Solid State Pulse Output KYZ Module Communication Digital Status Input Module Specifications Nexus with Internal Modem Option Chapter Nexus Monitor with Internal Modem Option 10-2 11-1 Chapter Nexus Meter with Internal Network Option 11-2 11-3 11-4 Theory of Operation Chapter Flicker Summary Instantaneous Flicker EvaluationShort Term Flicker Evaluation Long Term Flicker Evaluation Measurement Procedure SetupData available Main screen Software User Interface Flicker Monitoring TimeStatus Frequency Plt Readings Displayed Short Term ReadingsPst Readings Displayed Long Term Readings Polling LoggingLog Viewer Performance Notes Excel Spreadsheet with Example Numbers Calculating Values Electro Industries/GaugeTech Doc # E107706 Electro Industries/GaugeTech Doc # E107706 Electro Industries/GaugeTech Doc # E107706 Electro Industries/GaugeTech Doc # E107706 Electro Industries/GaugeTech Doc # E107706 Electro Industries/Gauge Tech Doc # E107706 Glossary Glossary-2 Glossary-3 Glossary-4 Glossary-5 Glossary-6